Annals of Coloproctology

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Original Articles

Translational/basic research

Preclinical testing of a new radiofrequency ablation device in a porcine perianal fistula model: Sunseok Yoon, Jung-Woo Choi, Yongtaik Son, Hyun Soon Lee, Kwang Dae Hong; Ann Coloproctol. 2025;41(1):84-92. Published online February 26, 2025; DOI: https://doi.org/10.3393/ac.2024.00626.0089

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Abstract PDF: Purpose
Anorectal fistulas present a treatment challenge, with conventional surgical methods potentially resulting in complications such as fecal incontinence. To improve patient outcomes, more effective and minimally invasive therapies are critically needed. In this study, an optimal porcine model for the creation of anorectal fistulas was developed and used to evaluate the efficacy of radiofrequency ablation (RFA) therapy.
Methods
Two distinct but related experiments were conducted. In the first experiment, a reliable and standardized porcine anorectal fistula model was developed. In the second, the healing process was assessed, and outcomes were compared between the RFA-treated group and the control group using the established porcine model.
Results
The results indicated that a 3.5-cm fistula tract length and a 14-day evaluation period following seton removal are optimal for the porcine anorectal fistula model. In the second experiment, the RFA group tended to exhibit better outcomes regarding fistula closure, although the differences were not statistically significant. Histopathologically, no significant difference in inflammation grade was observed between groups; however, scar tissue was more predominant in the RFA group.
Conclusion
The findings suggest that RFA therapy may offer potential benefits in the treatment of anorectal fistulas, as demonstrated using a porcine model. To validate these results and explore the mechanisms of action underlying RFA therapy for anorectal fistulas, further research involving larger sample sizes and a more robust study design is required.

Malignant disease,Rectal cancer,Complication,Biomarker & risk factor

Cross-sectional area of psoas muscle as a predictive marker of anastomotic failure in male rectal cancer patients: Japanese single institutional retrospective observational study: Yusuke Mizuuchi, Yoshitaka Tanabe, Masafumi Sada, Koji Tamura, Kinuko Nagayoshi, Shuntaro Nagai, Yusuke Watanabe, Sadafumi Tamiya, Kohei Nakata, Kenoki Ohuchida, Toru Nakano, Masafumi Nakamura; Ann Coloproctol. 2022;38(5):353-361. Published online April 12, 2022; DOI: https://doi.org/10.3393/ac.2022.00122.0017

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Graphical Abstract Abstract PDF Supplementary Material

Purpose
Preoperative sarcopenia worsens postoperative outcomes in various cancer types including colorectal cancer. However, we often experienced postoperative anastomotic leakage in muscular male patients such as Judo players, especially in rectal cancer surgery with lower anastomosis. It is controversial whether the whole skeletal muscle mass impacts the potential for anastomotic failure in male rectal cancer patients. Thus, the purpose of this study was to clarify whether skeletal muscle mass impacts anastomotic leakage in rectal cancer in men.
Methods
We reviewed the medical charts of male patients suffering from rectal cancer who underwent colo-procto anastomosis below the peritoneal reflection without a protective diverting stoma. We measured the psoas muscle area and calculated the psoas muscle index.
Results
One hundred ninety-seven male rectal cancer patients were enrolled in this study. The psoas muscle index was significantly higher in patients with anastomotic leakage (P<0.001). Receiver operating characteristic curve determined the optimal cut-off value of the psoas muscle index for predicting anastomotic leakage as 812.67 cm²/m² (sensitivity of 60% and specificity of 74.3%). Multivariate analysis revealed that high psoas muscle index (risk ratio [RR], 3.933; P<0.001; 95% confidence interval [CI], 1.917–8.070) and super low anastomosis (RR, 2.792; P=0.015; 95% CI, 1.221–6.384) were independent predictive factors of anastomotic leakage.
Conclusion
This study showed that male rectal cancer patients with a large psoas muscle mass who underwent lower anastomosis had a higher rate of postoperative anastomotic leakage.

Citations

Citations to this article as recorded by

Sex Disparities in Rectal Cancer Surgery: An In-Depth Analysis of Surgical Approaches and Outcomes
Chungyeop Lee, In Ja Park
The World Journal of Men's Health.2024; 42(2): 304. CrossRef
Unraveling the role of computed tomography derived body composition metrics on anastomotic leakages rates in rectal cancer surgery: A protocol for a systematic review and meta-analysis
Mark Broekman, Charlotte M. S. Genders, Ritchie T. J. Geitenbeek, Klaas Havenga, Schelto Kruijff, Joost M. Klaase, Alain R. Viddeleer, Esther C. J. Consten, Ozlem Boybeyi-Turer
PLOS ONE.2024; 19(7): e0307606. CrossRef
Association of computed tomography‐derived body composition and complications after colorectal cancer surgery: A systematic review and meta‐analysis
Claire P.M. van Helsdingen, Job G.A. van Wijlick, Ralph de Vries, Nicole D. Bouvy, Mariska M.G. Leeflang, Robert Hemke, Joep P.M. Derikx
Journal of Cachexia, Sarcopenia and Muscle.2024; 15(6): 2234. CrossRef
Prognostic Value of Artificial Intelligence-Driven, Computed Tomography-Based, Volumetric Assessment of the Volume and Density of Muscle in Patients With Colon Cancer
Minsung Kim, Sang Min Lee, Il Tae Son, Taeyong Park, Bo Young Oh
Korean Journal of Radiology.2023; 24(9): 849. CrossRef
Impact of Postoperative Naples Prognostic Score to Predict Survival in Patients with Stage II–III Colorectal Cancer
Su Hyeong Park, Hye Seung Woo, In Kyung Hong, Eun Jung Park
Cancers.2023; 15(20): 5098. CrossRef
Fluorescence-guided colorectal surgery: applications, clinical results, and protocols
Jin-Min Jung, In Ja Park, Eun Jung Park, Gyung Mo Son
Annals of Surgical Treatment and Research.2023; 105(5): 252. CrossRef
Preventing Anastomotic Leakage, a Devastating Complication of Colorectal Surgery
Hyun Gu Lee
The Ewha Medical Journal.2023;[Epub] CrossRef
Can the cross-sectional area of the psoas muscle be a predictor of anastomotic failure in male rectal cancer patients?
Myong Hoon Ihn
Annals of Coloproctology.2022; 38(5): 333. CrossRef
Psoas Muscle Index – Could It Be an Indicator of Postoperative Complications in Colorectal Cancer? Case Presentation and Review of the Literature
Georgiana Alexandra Scurtu, Zsolt Zoltán Fülöp, Botond Kiss, Patricia Simu, Diana Burlacu, Tivadar Bara
Journal of Interdisciplinary Medicine.2022; 7(4): 100. CrossRef

Case Report

Malignant disease,Rare disease & stoma

Malignant Melanoma of Anorectum: Two Case Reports: Binh Van Pham, Jae Hyun Kang, Huynh Huu Phan, Min Soo Cho, Nam Kyu Kim; Ann Coloproctol. 2021;37(1):65-70. Published online February 28, 2021; DOI: https://doi.org/10.3393/ac.2020.01.07.1

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18 Web of Science
14 Citations

Abstract PDF

Malignant melanoma of the anorectum is a rare disorder. Patients often present with local symptoms similar to benign diseases. The prognosis is very poor, and almost all patients die because of metastases. We report 2 female patients with unremarkable histories. Both of them received previous operations before visiting our center after they were diagnosed with anorectal malignant melanoma. One case underwent abdominoperineal resection and postoperative chemotherapy. The other had been treated with ultralow anterior resection followed by immunotherapy.

Citations

Citations to this article as recorded by

Case Report: Surgical management and prognostic factors in primary anorectal melanoma: a retrospective analysis of nine cases
Xiangxiang Ren, Xiaoshi Jin, Tianhao Xie, Litao Liu, Qiang Wang, Xingli Sun, Meng Zhang
Frontiers in Medicine.2025;[Epub] CrossRef
Malignant melanoma of the anal canal: a case report
Shubu Parajuli, Shruti Sah, Narendra Pandit
Journal of Surgical Case Reports.2025;[Epub] CrossRef
A Rare Entity: Primary Malignant Melanoma of the Anorectum
Jeongmin Choi, Jong Whan Kim
Journal of Digestive Cancer Research.2024; 12(1): 44. CrossRef
Anorectal Malignant Melanoma Post- Hemorrhoidectomy
Ramazan Kozan, Ozkan Akpinar, Meral Toker
Acta Médica Portuguesa.2024; 37(7-8): 556. CrossRef
Immunotherapy for anorectal melanoma: A case report
Nicholas L. Vitagliano, Muhammad B. Darwish, Roger W. Hsiung
Current Problems in Cancer: Case Reports.2024; 15: 100302. CrossRef
Amelanotic Malignant Melanoma With Atypical Divergent Neuroendocrine Differentiation: A Report of an Unusual and Rare Case of Anorectal Bleeding
Shamiliprabha MG, Anand CD, Supriya Verma, Nivethitha S, Jaison J John
Cureus.2024;[Epub] CrossRef
Anorectal melanoma: systematic review of the current literature of an aggressive type of melanoma
Giovanni Paolino, Antonio Podo Brunetti, Carolina De Rosa, Carmen Cantisani, Franco Rongioletti, Andrea Carugno, Nicola Zerbinati, Mario Valenti, Domenico Mascagni, Giulio Tosti, Santo Raffaele Mercuri, Riccardo Pampena
Melanoma Research.2024; 34(6): 487. CrossRef
A rare account of incidentally discovered anal melanoma
Nawal Khan, Dondre Irving, Lynn O’Connor
Journal of Surgical Case Reports.2024;[Epub] CrossRef
Prolapsed anorectal malignant melanoma presenting as hemorrhoids
Busara Songtanin, Kenneth Nugent, Sameer Islam
Baylor University Medical Center Proceedings.2023; 36(1): 89. CrossRef
Long recurrence-free survival of localized rectal melanoma after abdominoperineal resection in comparison to partial excision and highlighting the place of immunotherapy: A case report
Othmane Bourouail, Noureddine Njoumi, Youssef Elmahdaouy, Mohamed Fahssi, Mbarek Yaka, Abderrahmane Hejjouji, Abdelmounaim Ait Ali
JRSM Open.2023;[Epub] CrossRef
Challenges in managing anorectal melanoma, a rare malignancy
Jyotirmoy Biswas, Lakshmi Deepak Bethineedi, Arkadeep Dhali, Jamal Miah, Sukanta Ray, Gopal Krishna Dhali
International Journal of Surgery Case Reports.2023; 105: 108093. CrossRef
Organ preservation in anorectal melanoma: A tempting challenge—a case report
Mohamed Mehdi Trabelsi, Neirouz Kammoun, Marwa Inoubli, Mohamed Ali Chaouch, Haifa Ben Romdhane, Wafa Koubaa, Hichem Jerraya
SAGE Open Medical Case Reports.2023;[Epub] CrossRef
Primary anorectal amelanotic melanoma with liver, lungs and lymph nodal metastases
James R Marak, Gaurav Raj, Shivam Dwivedi, Ariba Zaidi
BMJ Case Reports.2023; 16(11): e257510. CrossRef
Treatment of Hemorrhoid in Unusual Condition-Pregnancy
Hyo Seon Ryu
The Ewha Medical Journal.2022;[Epub] CrossRef

Original Articles

Malignant disease, Rectal cancer, Functional outcomes

Early and Late Functional Outcomes of Anal Sphincter-Sparing Procedures With Total Mesorectal Excision for Anorectal Adenocarcinoma: Osama Eldamshety, Sherif Kotb, Ashraf Khater, Sameh Roshdy, Mohamed Elashry, Mohamed S. Zahi, Hend M. Hamdey Rashed Elkalla, Waleed Elnahas, Omar Farouk, Adel Fathi, Ahmed Senbel, Emad-Eldeen Hamed, Khaled Abdelwahab, Islam Abdou Elzahby, Ahmed abdallah, Mahmoud Abdelaziz, Emanuele Lezoche; Ann Coloproctol. 2020;36(3):148-154. Published online April 20, 2020; DOI: https://doi.org/10.3393/ac.2018.07.19

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15 Web of Science
15 Citations

Abstract PDF

Background
The study aims to assess the functional outcome of anal sphincter sparing procedures (SSP) with TME for anorectal adenocarcinoma.
Methods
In a multicentric, prospective, single-group study in the period between December 2012 and November 2017, 93 patients presented with anorectal adenocarcinoma were included in the study. Sixty-nine patients underwent SSP with TME. SSP included the combined approach of transabdominal TME with intersphincteric resection (ISR) or transanal transabdominal TME (TATA). Using the Per Anal Examination Scoring System (PASS), postoperative anal function was assessed after one year.
Results
Bowel motility time was 50 (±19) hours. The time needed for narcotic analgesia was 54 (±18.8) hours. Mean hospital stay was 15.4 (±10.25) days. Incidence of evident fecal incontinence after ISR is 10.6% (7/67 cases). The Per Anal Examination Scoring System (PASS) findings of 69 cases are as follows: extremely hypotonic 8.6% (6 cases), slightly hypotonic 26.1% (18 cases), normal tone 58% (40 cases), slightly stenotic 3 cases (4.3%), or occluded 2.9% (2 cases). Urinary dysfunction occurred in one case (1.4%). Temporary diversion was performed in 61 patients (87.1%).
Conclusion
Sphincter preservation with TME for anorectal adenocarcinoma helps avoid permanent stoma and provides a reasonable functional outcome. PASS is a new application for postoperative assessment of anal function

Citations

Citations to this article as recorded by

Transanal Minimally Invasive TME (TaTME) Versus Non-Endoscopic Transanal Intersphincteric Resection of Post-Neoadjuvant Ultralow Rectal Adenocarcinoma: A Multicentric, Matched Case–Control Study
Osama Eldamshety, Mohamed Abdekhalek, Amir M. Zaid, Essam Attia, Mohamed Zuhdy, Emanuel Lezoche, Giovanni Lezoche, Enjy Mosaad, Marwa Abogabal, Islam Elzahby
Indian Journal of Surgery.2025; 87(5): 912. CrossRef
Pathologic Implications of Magnetic Resonance Imaging-detected Extramural Venous Invasion of Rectal Cancer
Hyun Gu Lee, Chan Wook Kim, Jong Keon Jang, Seong Ho Park, Young Il Kim, Jong Lyul Lee, Yong Sik Yoon, In Ja Park, Seok-Byung Lim, Chang Sik Yu, Jin Cheon Kim
Clinical Colorectal Cancer.2023; 22(1): 129. CrossRef
International Society of University Colon and Rectal Surgeons survey of surgeons’ preference on rectal cancer treatment
Audrius Dulskas, Philip F. Caushaj, Domas Grigoravicius, Liu Zheng, Richard Fortunato, Joseph W. Nunoo-Mensah, Narimantas E. Samalavicius
Annals of Coloproctology.2023; 39(4): 307. CrossRef
Multidisciplinary treatment strategy for early rectal cancer
Gyung Mo Son, In Young Lee, Sung Hwan Cho, Byung-Soo Park, Hyun Sung Kim, Su Bum Park, Hyung Wook Kim, Sang Bo Oh, Tae Un Kim, Dong Hoon Shin
Precision and Future Medicine.2022; 6(1): 32. CrossRef
Watch and wait strategies for rectal cancer: A systematic review
In Ja Park
Precision and Future Medicine.2022; 6(2): 91. CrossRef
Current status and role of robotic approach in patients with low-lying rectal cancer
Hyo Seon Ryu, Jin Kim
Annals of Surgical Treatment and Research.2022; 103(1): 1. CrossRef
Robotic surgery for colorectal cancer
Sung Uk Bae
Journal of the Korean Medical Association.2022; 65(9): 577. CrossRef
Update on Diagnosis and Treatment of Colorectal Cancer
Chan Wook Kim
The Ewha Medical Journal.2022;[Epub] CrossRef
Low Anterior Resection Syndrome: Pathophysiology, Risk Factors, and Current Management
Seung Mi Yeo, Gyung Mo Son
The Ewha Medical Journal.2022;[Epub] CrossRef
Current Status and Future of Robotic Surgery for Colorectal Cancer-An English Version
Sung Uk Bae
Journal of the Anus, Rectum and Colon.2022; 6(4): 221. CrossRef
Is It a Refractory Disease?- Fecal Incontinence; beyond Medication
Chungyeop Lee, Jong Lyul Lee
The Ewha Medical Journal.2022;[Epub] CrossRef
Intraoperative neuromonitoring in rectal cancer surgery: a systematic review and meta-analysis
Athina A. Samara, Ioannis Baloyiannis, Konstantinos Perivoliotis, Dimitrios Symeonidis, Alexandros Diamantis, Konstantinos Tepetes
International Journal of Colorectal Disease.2021; 36(7): 1385. CrossRef
Robotic Intersphincteric Resection for Low Rectal Cancer: Technical Controversies and a Systematic Review on the Perioperative, Oncological, and Functional Outcomes
Guglielmo Niccolò Piozzi, Seon Hahn Kim
Annals of Coloproctology.2021; 37(6): 351. CrossRef
Functional outcomes after sphincter-preserving surgeries for low-lying rectal cancer: A review
Eun Jung Park, Seung Hyuk Baik
Precision and Future Medicine.2021; 5(4): 164. CrossRef
Simplification or Accuracy: In Assessing Functional Outcomes After Intersphincteric Resection for Low Rectal Cancer
Kyung Jong Kim
Annals of Coloproctology.2020; 36(3): 129. CrossRef

Benign proctology

Initial Experience With Video-Assisted Anal Fistula Treatment in the Philippines: Marc Paul J. Lopez, Mark Augustine S. Onglao, Hermogenes J. Monroy III; Ann Coloproctol. 2020;36(2):112-118. Published online March 16, 2020; DOI: https://doi.org/10.3393/ac.2020.02.28

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6 Web of Science
7 Citations

Abstract PDF

Purpose
We determined the outcomes of patients undergoing video-assisted anal fistula treatment (VAAFT) for fistulain-ano at the Philippine General Hospital.
Methods
Twenty consecutive adult patients who underwent the VAAFT procedure from 2016–2018 were included in this investigation. Information detailing baseline demographic and clinical data, fistula type and classification, and previous surgeries were retrieved from in-hospital and operative records. Operative time, identification of the internal opening, method of internal opening closure, and occurrence of immediate postoperative complications were determined. The status of the fistula was assessed at one month, 3 months, and 6 months postoperatively based on outpatient follow-up records. The primary outcomes were healing rate and recurrence rate. Secondary outcomes were 30-day morbidity, postoperative complications, and incontinence using the Wexner score.
Results
Eighteen patients (90%) had a preoperative diagnosis of complex fistula, and 13 patients (65%) had undergone a previous fistula surgery. Primary healing rate was 55% at 1 month, 63.16% at 3 months, and 78.95% at 6 months postoperatively. Eighteen patients (94.74%) maintained continence (Wexner score = 0) at 6 months.
Conclusion
Our study results suggest that VAAFT is a safe, minimally invasive technique for treatment of anal fistula and can preserve anal sphincter function. The technique has an acceptable healing rate with minimal complications.

Citations

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A technical note of flex video-assisted anal fistula treatment procedure: Utilizing modified flexible fistuloscope in video-assisted approach for anal fistula laser treatment
Okkian Wijaya Kotamto, Tery Nehemia Nugraha Joseph, Clement Dewanto, Natalia Maria Christina, Nadiska Patricia Artha, Marsja Ruthfanny Hutapea, Jeremiah H. Wijaya
Surgery Open Science.2025; 24: 80. CrossRef
Failure rates and complications of four sphincter-sparing techniques for the treatment of fistula-in-ano: a systematic review and network meta-analysis
G. Fuschillo, F. Pata, M. D’Ambrosio, L. Selvaggi, M. Pescatori, F. Selvaggi, G. Pellino
Techniques in Coloproctology.2025;[Epub] CrossRef
Efficacy and safety of video-assisted anal fistula treatment in anorectal fistula: a meta-analysis
Chunqiang WANG, Tianye HUANG, Xuebing WANG
Minerva Gastroenterology.2024;[Epub] CrossRef
Long term efficacy of Video‐Assisted Anal Fistula Treatment (VAAFT) for complex fistula‐in‐ano: a single‐centre Australian experience
Mat Hinksman, Sanjeev Naidu, Kenneth Loon, Joshua Grundy
ANZ Journal of Surgery.2022; 92(5): 1132. CrossRef
Advancing standard techniques for treatment of perianal fistula; when tissue engineering meets seton
Hojjatollah Nazari, Zahra Ebrahim Soltani, Reza Akbari Asbagh, Amirsina Sharifi, Abolfazl Badripour, Asieh Heirani Tabasi, Majid Ebrahimi Warkiani, Mohammad Reza Keramati, Behnam Behboodi, Mohammad Sadegh Fazeli, Amir Keshvari, Mojgan Rahimi, Seyed Mohsen
Health Sciences Review.2022; 3: 100026. CrossRef
Is It a Refractory Disease?- Fecal Incontinence; beyond Medication
Chungyeop Lee, Jong Lyul Lee
The Ewha Medical Journal.2022;[Epub] CrossRef
VAAFT for complex anal fistula: a useful tool, however, cure is unlikely
T. J. G. Chase, A. Quddus, D. Selvakumar, P. Cunha, T. Cuming
Techniques in Coloproctology.2021; 25(10): 1115. CrossRef

Anorectal Manometry Versus Patient-Reported Outcome Measures as a Predictor of Maximal Treatment for Fecal Incontinence: Lisa Ramage, Shengyang Qiu, Zhu Yeap, Constantinos Simillis, Christos Kontovounisios, Paris Tekkis, Emile Tan; Ann Coloproctol. 2019;35(6):319-326. Published online December 31, 2019; DOI: https://doi.org/10.3393/ac.2018.10.16

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5 Web of Science
8 Citations

Abstract PDF

Purpose
This study aims to establish the ability of patient-reported outcome measures (PROMs) and anorectal manometry (ARM) in predicting the need for surgery in patients with fecal incontinence (FI).
Methods
Between 2008 and 2015, PROMs data, including the Birmingham Bowel and Urinary Symptoms Questionnaire (BBUSQ), Short Form 36 (SF-36), Wexner Incontinence Score and ARM results, were prospectively collected from 276 patients presenting with FI. Spearman rank was used to assess correlations between specific PROMs questions and ARM assessments of sphincter motor function. Binomial regression analyses were performed to identify factors predictive of the need for surgery. Finally, receiver operating characteristic (ROC) curve analyses were performed to establish the utility of individual ARM and PROMs variables in predicting the need for surgical intervention in patients with FI.
Results
Two hundred twenty-eight patients (82.60%) were treated conservatively while 48 (17.39%) underwent surgery. On univariate analyses, all 4 domains of the BBUSQ, all 8 domains of the SF-36, and the Wexner Incontinence Score were significant predictors of surgery. Additionally, maximum resting pressure, 5-second squeeze endurance, threshold volume, and urge volume were significant. On ROC curve analyses, the only significant ARM measurement was the 5-second squeeze endurance. PROMs, such as the incontinence domain of the BBUSQ and five of the SF-36 domains, were identified as fair discriminators of the need for surgery.
Conclusion
PROMs are reliable predictors of maximal treatment in patients with FI and can be readily used in primary care to aid surgical referrals and can be applied in hospital settings as an aid to guide surgical treatment decisions.

Citations

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Capturing Patient Reported Outcomes Following Treatment of Benign Anorectal Disease Requires Significant Surgeon Commitment: Do Surgeons Really Want to Know?
Thomas Peponis, Marc S. Rubin, Ronald Bleday, Harrison T. Hubbell, Robert N. Goldstone, Joel E. Goldberg, Khawaja F. Ahmed, Liliana G. Bordeianou
World Journal of Colorectal Surgery.2025; 14(1): 1. CrossRef
Clinical Grade of Obstetric Anal Sphincter Injuries and Prediction of Mode of Birth Recommendations: A 20‐Year Retrospective Analysis
Nicola Adanna Okeahialam, Ranee Thakar, Abdul H. Sultan
BJOG: An International Journal of Obstetrics & Gynaecology.2025; 132(12): 1802. CrossRef
Correlation of Digital Rectal Examination and Anorectal Manometry with Patient-Reported Outcomes Among Women with Fecal Incontinence
Alayne Markland, Mary Ackenbom, Uduak Andy, Ben Carper, Eric Jelovsek, Douglas Luchristt, Shawn Menefee, Rebecca Rogers, Vivian Sung, Donna Mazloomdoost, Maria Gantz
International Urogynecology Journal.2024; 35(12): 2367. CrossRef
Pelvic floor investigations for anal incontinence: Are they useful to predict outcomes from conservative treatment?
Karina Cuinas, Linda Ferrari, Carlene Igbedioh, Deepa Solanki, Andrew Williams, Alexis Schizas, Alison Hainsworth
Neurourology and Urodynamics.2023; 42(5): 1122. CrossRef
Anorectal dysfunction in multiple sclerosis patients: A pilot study on the effect of an individualized rehabilitation approach
Martina Kovari, Jan Stovicek, Jakub Novak, Michaela Havlickova, Sarka Mala, Andrew Busch, Pavel Kolar, Alena Kobesova
NeuroRehabilitation.2022; 50(1): 89. CrossRef
Postpartum fecal incontinence. State of the problem
D.R. Markaryan, A.M. Lukyanov, T.N. Garmanova, M.A. Agapov, V.A. Kubyshkin
Khirurgiya. Zhurnal im. N.I. Pirogova.2022; (6): 127. CrossRef
Functional outcomes after sphincter-preserving surgeries for low-lying rectal cancer: A review
Eun Jung Park, Seung Hyuk Baik
Precision and Future Medicine.2021; 5(4): 164. CrossRef
Usefulness of Patient-Reported Outcome Measures and Anorectal Physiologic Tests in Predicting Clinical Outcome for Fecal Incontinence
Chang-Nam Kim
Annals of Coloproctology.2019; 35(6): 289. CrossRef

Efficacy of Plug Treatment for Complex Anorectal Fistulae: Long-term Danish Results: Melina Svraka Hansen, Monica Linda Kjær, Jens Andersen; Ann Coloproctol. 2019;35(3):123-128. Published online March 20, 2019; DOI: https://doi.org/10.3393/ac.2018.07.14

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9 Web of Science
11 Citations

Abstract PDF

Purpose
Bioprosthetic plugs are appealing, allow simple, repeatable applications, preserve sphincter integrity, minimize patient discomfort, and allow subsequent surgical options when needed. However, success rates vary widely. This study assessed the healing rate in our department when both the Cook-Surgisis and the Gore fistula plugs were used and the long-term effectiveness of using anal plugs for managing anal fistulae.
Methods
A chart review was performed for patients who had undergone plug insertion between January 2008 and December 2015 at Copenhagen University Hospital, Hvidovre. Data were collected through a prospectively collected database. Plugs were inserted according to guidance provided by 2 experienced surgeons. Long-term results were determined by clinical visits 3, 6, and 12 months after surgery and once yearly thereafter.
Results
From 2008 to 2015, 36 fistula plugs were inserted. During the follow-up period with a median duration of 18 months (range, 7–60 months), the fistulae of 52.8% of the patients healed. The plug failure rate was 44.4%, and the fistula recurrence rate was 26.3%. The median time to recurrence was 12 months. The overall success rate for plug treatment in our department was 39% when adjusted for recurrence.
Conclusion
The use of bioprosthetic plugs to treat patients with complex anal fistulae seems to be a safe, viable option for complex fistula repair when other surgical attempts have failed. However, it should not be the treatment of choice. Further prospective randomized studies with a sufficient sample-size and standardized measurements are necessary to evaluate the efficacy of fistula plugs fully.

Citations

Citations to this article as recorded by

A Pilot Study of Porcine Acellular Bladder Matrix Filling in the Treatment of Anal Fistulas: A Single‐Center Cohort Study
Xiang Ma, Weisong Xue, Zuolin Zhou, Qiong He, Feng Yang, Ningchao Du, Jun Sun, Huiwen Ning, NiNi Liu, Ying Luo, Jian Cai
ANZ Journal of Surgery.2025;[Epub] CrossRef
Evidence outside the box: Minimally invasive treatment for anal fistula
Kah Hau Luke Chua, Daniel Jin Keat Lee
World Journal of Gastrointestinal Surgery.2025;[Epub] CrossRef
A Prospective, Single-Arm Study to Evaluate the Safety and Efficacy of an Autologous Blood Clot Product in the Treatment of Anal Fistula
Edward Ram, Yaniv Zager, Dan Carter, Olga Saukhat, Roi Anteby, Ido Nachmany, Nir Horesh
Diseases of the Colon & Rectum.2024; 67(4): 541. CrossRef
Application of biomaterials for complex anal fistulae
Daniel P. Fitzpatrick, Carmel Kealey, Damien Brady, Noel Gately
International Journal of Polymeric Materials and Polymeric Biomaterials.2023; 72(3): 204. CrossRef
Improved fistula plug outcome depends on the type of plug: a single‐centre retrospective study
Adele E Sayers, Matthew J Lee, Steve R Brown
Colorectal Disease.2023; 25(5): 995. CrossRef
Surgical treatment of anal fistula
A. Ya. Ilkanich, V. V. Darwin, E. A. Krasnov, F. Sh. Aliyev, K. Z. Zubailov
Сибирский научный медицинский журнал.2023; 43(5): 74. CrossRef
Impact du nombre de chirurgies antérieures sur la continence anale et la cicatrisation des fistules anales récidivantes
S.H. Emile, W. Khafagy, S.A. Elbaz
Journal de Chirurgie Viscérale.2022; 159(3): 219. CrossRef
Impact of number of previous surgeries on the continence state and healing after repeat surgery for recurrent anal fistula
S.H. Emile, W. Khafagy, S.A. Elbaz
Journal of Visceral Surgery.2022; 159(3): 206. CrossRef
Plug, Laser, videogestützte Behandlung von Analfisteln, Over-The-Scope-Clip, Stammzellen
Johannes Jongen, Jessica Scheider, Tilman Laubert, Volker Kahlke
coloproctology.2022; 44(1): 23. CrossRef
Comprehensive literature review of the applications of surgical laser in benign anal conditions
Ahmed Hossam Elfallal, Mohammad Fathy, Samy Abbas Elbaz, Sameh Hany Emile
Lasers in Medical Science.2022; 37(7): 2775. CrossRef
Ligation of intersphincteric fistula tract (LIFT) in treatment of anal fistula: An updated systematic review, meta-analysis, and meta-regression of the predictors of failure
Sameh Hany Emile, Sualeh Muslim Khan, Adeyinka Adejumo, Oyintonbra Koroye
Surgery.2020; 167(2): 484. CrossRef

Case Report

Colorectal Perforation After Anorectal Manometry for Low Anterior Resection Syndrome: Kyung Ha Lee, Ji Yeon Kim, Young Hoon Sul; Ann Coloproctol. 2017;33(4):146-149. Published online August 31, 2017; DOI: https://doi.org/10.3393/ac.2017.33.4.146

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6 Web of Science
5 Citations

Abstract PDF

We experienced 3 cases of manometry-induced colon perforation. A 75-year-old man (case 1) underwent anorectal manometry (ARM) 3 years after radiotherapy for prostate cancer and a laparoscopic intersphincteric resection for rectal cancer. A 70-year-old man (case 2) underwent ARM 3 months after conventional neoadjuvant chemoradiotherapy and a laparoscopic low anterior resection for rectal cancer. A 78-year-old man (case 3) underwent ARM 2 months after a laparoscopic intersphincteric resection for rectal cancer. In all cases, a colon perforation with fecal peritonitis occurred. All were treated successfully using prompt and active operations and were discharged without any complications. ARM with a balloon, as a measure of rectal compliance, should be performed 2 months or longer after surgery. If a perforation occurs, prompt and active surgical intervention is necessary due to the high possibility of extensive fecal peritonitis.

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Effect of low anterior resection syndrome on quality of life in colorectal cancer patients: A retrospective observational study
Dong-Ai Jin, Fang-Ping Gu, Tao-Li Meng, Xuan-Xuan Zhang
World Journal of Gastrointestinal Surgery.2023; 15(10): 2123. CrossRef
Functional anorectal studies in patients with low anterior resection syndrome
Ssu‐Chi Chen, Kaori Futaba, Wing Wa Leung, Cherry Wong, Tony Mak, Simon Ng, Hans Gregersen
Neurogastroenterology & Motility.2022;[Epub] CrossRef
Variation in rectoanal inhibitory reflex after laparoscopic intersphincteric resection for ultralow rectal cancer
Bin Zhang, Ke Zhao, Yu‐Juan Zhao, Shu‐Hui Yin, Guang‐Zuan Zhuo, Yong Zhao, Jian‐Hua Ding
Colorectal Disease.2021; 23(2): 424. CrossRef
Broken beer bottle as a cause of sigmoid perforation: A summary of causes and predictors in the management of traumatic and non-traumatic colorectal perforation
Christian German Ospina-Pérez, Ana Milena Álvarez-Acuña, Lina María López-Álvarez, Rosa María Ospina-Pérez, Ivan David Lozada-Martínez, Sabrina Rahman
International Journal of Surgery Case Reports.2021; 85: 106261. CrossRef
Assessment of defecation function after sphincter-saving resection for mid to low rectal cancer: A cross-sectional study
Bao-Jia Luo, Mei-Chun Zheng, Yang Xia, Zhu Ying, Jian-Hong Peng, Li-Ren Li, Zhi-Zhong Pan, Hui-Ying Qin
European Journal of Oncology Nursing.2021; 55: 102059. CrossRef

Original Article

Treatment Outcomes of Anorectal Melanoma: Byung Min Choi, Hyoung Ran Kim, Hae-Ran Yun, Seung Ho Choi, Yong Beom Cho, Hee Cheol Kim, Seong Hyeon Yun, Woo Yong Lee, Ho-Kyung Chun; J Korean Soc Coloproctol. 2011;27(1):27-30. Published online February 28, 2011; DOI: https://doi.org/10.3393/jksc.2011.27.1.27

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18 Citations

Abstract PDF

Purpose

An anorectal melanoma (AM) is a very rare tumor. However, sufficient data supporting effective surgical options for the disease do not exist. This retrospective review aimed to analyze treatment outcomes for an AM.

Methods

From June 1999 to December 2008, we retrospectively reviewed a prospectively collected consecutive series of 19 patients who had undergone a surgical resection for an AM at a single institute. Surgical method and clinicopathological factors were analyzed.

Results

The median age was 61.4 years (range, 46 to79 years). Main symptoms were an anal mass, hematochezia, perianal pain, tenesmus, fecal incontinence, and bowel habit change. The average duration of symptoms before diagnosis was 7.8 months (range, 1 to 36 months). S-100 and HMB-45 were positive in all patients, even in non-melanin pigmentation. There were 12 abdominoperineal resections (APRs) and 7 wide local excisions (WEs). The APR showed longer overall survival when compared with the WE (64.1 months vs. 10.9 months, P < 0.001). No patients who underwent a WE survived more than 13 months.

Conclusion

A high index of suspicion is necessary to establish the diagnosis for an AM in patients with anal symptoms, and S-100 and HMB-45 can be useful markers for an AM. Even with the small number of cases and the short follow-up, our data suggest that an APR for an AM may provide longer survival than a WE.

Citations

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Trends in the management of anorectal melanoma: A multi-institutional retrospective study and review of the world literature
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BJS Open.2021;[Epub] CrossRef
Long-term Oncologic Outcome and Its Relevant Factors in Anal Cancer in Korea: A Nationwide Data Analysis
Hyuk Hur, Kyu-Won Jung, Byung-Woo Kim, Chang-Mo Oh, Young-Joo Won, Jae Hwan Oh, Nam Kyu Kim
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European Journal of Cancer.2020; 135: 113. CrossRef
Anorectal Malignant Melanoma: Retrospective Analysis of Six Patients and Review of the Literature
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Extensive surgery and lymphadenectomy do not improve survival in primary melanoma of the anorectum: results from analysis of a large database (SEER)
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Das anorektale maligne Melanom
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Anorectal malignant melanoma: retrospective analysis of management and outcome in a single Portuguese Institution
Isália Miguel, João Freire, Maria José Passos, António Moreira
Medical Oncology.2015;[Epub] CrossRef
Characteristics and Survival of Korean Anal Cancer From the Korea Central Cancer Registry Data
Hyoung-Chul Park, Kyu-Won Jung, Byung-Woo Kim, Aesun Shin, Young-Joo Won, Jae Hwan Oh, Seung-Yong Jeong, Chang Sik Yu, Bong Hwa Lee
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Incidence and Survival Patterns of Rare Anal Canal Neoplasms Using the Surveillance Epidemiology and End Results Registry
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Rectal melanoma
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Hellenic Journal of Surgery.2012; 84(3): 198. CrossRef

Review

Anorectal Physiology: Test and Clinical Application: Hyeon-Min Cho; J Korean Soc Coloproctol. 2010;26(5):311-315. Published online October 31, 2010; DOI: https://doi.org/10.3393/jksc.2010.26.5.311

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Abstract PDF

The physiology of the anorectal region is very complex, and it is only recently that detailed investigations have given us a better understanding of its function. The methods that are used for the evaluation of anorectal physiology include anorectal manometry, defecography, continence tests, electromyography of the anal sphincter and the pelvic floor, and nerve stimulation tests. These techniques furnish a clearer picture of the mechanisms of anorectal disease and demonstrate pathophysiologic abnormalities in patients with disorders of the anorectal region. Therefore, therapeutic recommendations for anorectal disease can be made best when the anatomy and the physiology of the anorectal region are understood.

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Original Article

Diagnosis and Treatment of Anorectal Lesions in Crohn's Disease.: Heo, Youn Jung , Park, Won Kap , Kim, Jae Cheol , Lee, Jong Kyun , Kim, Kwang Yeon; J Korean Soc Coloproctol. 2010;26(3):190-196.; DOI: https://doi.org/10.3393/jksc.2010.26.3.190

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Abstract PDF: PURPOSE
Anorectal lesions in patients with Crohn's disease (CD) are difficult to manage because of frequent recurrences and complications. The aim of this study is to evaluate the relationship between anorectal lesions and CD and to analyze the methods of management and the results of anorectal lesions.
METHODS
The records of 33 patients with CD who had anorectal lesions, who visited our institution from July 2001 to June 2007, were reviewed retrospectively.
RESULTS
CDs involving the small and the large bowel in 24 patients, the small bowel in 4 patients, the large bowel in 4 patients, and only the anorectum in 1 patient. Twenty-two patients (75.9%) were diagnosed as CD with unusual anorectal findings: unhealed wound or delayed healing of wound after the initial anal operation, multiple ulcers or fissures, broad based or friable fistula tract, non-cryptoglandular type of fistula, multiple fistula tracts, and recurrent or concurrent fistula. The predominant type of anorectal lesion was a perianal fistula (28 patients, 84.8%). Twelve out of 45 anal specimens (26.7%) showed noncaseating epithelioid granulomas, characteristic findings of CD. Conservative treatment was performed in 7 patients (21.2%), anorectal operations in 26 patients (78.8%). Twelve of those 26 patients underwent multiple operations. Anorectal operations were performed as follows: incision and drainage (8), fistulotomy or fistulectomy (17), muscle-preserving surgery (7), seton drainage (12), and modified Hanley's procedure (1). All anorectal operations, except those for an abscess, were performed after induction of remission of the CD. Satisfactory results were achieved in 29 patients (87.9%).
CONCLUSION
In patients with unusual anorectal lesions, a diagnostic work-up for CD should be performed. Anorectal lesions with CD may be properly managed using several different methods, depending on the anorectal conditions and the activity of the CD.

Case Report

Rectal Perforation after Anorectal Manometry Following Preoperative Chemoradiotherapy and Low Anterior Resection: Report of a Cases.: Jeong, Woon Kyung , Chung, Tae Sung , Lim, Sang Woo , Park, Ji Won , Lim, Seok Byung , Choi, Hyo Seong , Jeong, Seung Yong; J Korean Soc Coloproctol. 2008;24(4):298-301.; DOI: https://doi.org/10.3393/jksc.2008.24.4.298

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3 Citations

Abstract PDF

Anorectal manometry is widely used to evaluate anorectal function. Few reports have described complications resulting from this procedure. A 47-year-old male underwent preoperative chemoradiotherapy and a low anterior resection for rectal cancer. The patient underwent anorectal manometry at postoperative 8 months. A rectal perforation was diagnosed shortly thereafter. The patient was initially managed conservatively using percutaneous drainage and parenteral antibiotics and then discharged on day 60 after the event. One month later, a colo-cutaneous fistula and expanding abdominal fasciitis developed. The patient underwent surgical exploration, drainage, resection of the rectum including the fistula, and redo-coloanal anastomosis with a diverting ileostomy. The patient discharged without complications on postoperative day 25. Anorectal manometry should be performed with particular care in patients who have undergone radiotherapy and anastomosis at the rectum.

Citations

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Habit training versus habit training with direct visual biofeedback in adults with chronic constipation: study protocol for a randomised controlled trial
Christine Norton, Anton Emmanuel, Natasha Stevens, S. Mark Scott, Ugo Grossi, Sybil Bannister, Sandra Eldridge, James M. Mason, Charles H. Knowles
Trials.2017;[Epub] CrossRef
Colorectal Perforation After Anorectal Manometry for Low Anterior Resection Syndrome
Kyung Ha Lee, Ji Yeon Kim, Young Hoon Sul
Annals of Coloproctology.2017; 33(4): 146. CrossRef
Perforación rectal tras manometría anorrectal sin enfermedad rectal previa: una complicación excepcional resuelta con tratamiento médico
Jorge Antonio Núñez Otero, Mariano Gómez Rubio, Ángel R. Durán Aguado, José L. Martínez Albares
Gastroenterología y Hepatología.2013; 36(9): 577. CrossRef

Reviews

The Roles of Anorectal Physiologic Tests and Treatment of Chronic Constipation.: Hwang, Yong Hee; J Korean Soc Coloproctol. 2008;24(2):148-159.; DOI: https://doi.org/10.3393/jksc.2008.24.2.148

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Abstract PDF: Patients with chronic constipation should be evaluated with physiological tests (defecography and cinedefecography, anal manometry, anal electromyography, and colon transit time) after structural disorders and extracolonic causes have been excluded. In the case of colonic inertia, at first, conservative treatment is necessary. If surgery is indicated, a subtotal colectomy with ileorectal anastomosis is the treatment of choice. Biofeedback is the best option for animus. For patients failing biofeedback, botulinum toxin injection of the puborectalis or sacral nerve stimulation may be indicated. Biofeedback treatment is also considered to be an option for moderate-degree rectoceles, rectal intussusception, and perineal descending syndrome. For the treatment of a severe rectocele, a surgical approach, including transrectal, transvaginal, and transperineal repair or stapled transanal rectal resection (STARR) should be considered. However, the long-term effects of a new technique including botulinum toxin injection, sacral nerve stimulation, and STARR remain to be established.

Biofeedback Therapy in Patients with Functional Evacuation Disorders.: Park, Ung Chae; J Korean Soc Coloproctol. 2003;19(4):260-269.

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Abstract PDF: Biofeedback therapy has emerged as a useful adjunct for patients with functional evacuation disorders over the past decade. The goals of biofeedback retraining may vary and could depend on the underlying dysfunction. In patients with obstructive defecation, the goals are to relax the anal sphincter, improve rectoanal coordination, and improve sensory perception. Methods of biofeedback therapy varied widely between centers. However, no difference was described when EMG-based biofeedback was compared to manometry-based biofeedback, or when visual or auditory feedback was given. In regards to biofeedback adjuncts, including sensory retraining with either an intrarectal balloon, a portable home-training unit or both can be practicable. There are inconsistencies in the literature regarding the patient selection criteria for biofeedback treatment. The patient group is not homogeneous. Different case selection, different regimens and different methods of biofeedback may explain the variability in success rate. Quality research that would assist in predicting outcome is still lacking. Although no specific denominator could possibly be assigned to correctly predict the overall outcome of therapy, biofeedback is not successful in all patients with outlet obstructed constipation. Results with success rates is ranging from 8.3 percent to 100 percent. The treatment of constipation by biofeedback has been viewed with some skepticism as the low success rate may simply be a placebo effect. The majority of scepticism to therapeutic outcome are derived from entry criteria for treatment. Lower success rates have been described when entry criteria were broadened. Prebiofeedback clinical findings which are presupposed to prognostic relevance are age, gender, duration of symptoms and presence of rectal pain, lower motor neuron disease, and psychiatric problems. I feel strongly that informations about the predictive factors are vital to all physicians either performing or recommending biofeedback to their patients. If biofeedback could be undertaken according to specific criteria, we, colorectal surgeon will save a fruitless endeavour, one would expect more improvements in more patients. Additional well-designed controlled trials are needed to establish the clinical and physiologic factors.

Original Article

Change of Anorectal Function after Low Anterior Resection for Rectal Cancer.: Yun, Min Young , Choi, Sun Keun , Bae, Sun Young , Hur, Yun Suk , Lee, Kun Young , Kim, Sei Joong , Ahn, Seung Ick , Hong, Kee Chun , Shin, Suk Hwan , Kim, Kyung Rae , Woo, Ze Hong; J Korean Soc Coloproctol. 2003;19(4):248-253.

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Abstract PDF: PURPOSE
The anorectal function after a low anterior resection for rectal cancer recovered progressively by 6 12 months after the operation, but the mechanisms and the recovery process are not well understood. The aim of this study was to correlate postoperative anorectal function after low anterior resection with physiologic parameters.
METHODS
Sixty-seven patients who underwent a low anterior resection for rectal cancer were studied. The control group was consisted of normal persons. Anorectal physiologic studies were conducted for 6 months postoperatively by using defecographys, anorectal manometry and electomyogram of pudendal nerve.
RESULTS
The postoperative anorectal function was gradully improved with time. Defecograms showed that the resting, squeezing, and straining anorectal angles were not significantly increased. Anorectal manometry showed that the threshold volume and the urgency volume were not significantly decreased but the maximal tolerable volume was decreased remarkably. The maximal resting pressure significantly decreased but the maximal squeezing pressure were not. The pudendal nerve electromyograms were not significantly different between the two groups. The patients were divided by based on the anastomosis level. The short anastomosis group showed more impairment in the urgency volume and the maximal resting pressure than that of the long anastomosis group.
CONCLUSION
The neorectal volume and the level of anastomosis were important for changes in the anorectal function after a low anterior resecton. Gradual improvement of symptoms resulted from a resected rectal adapted to a neorectal volum.

Randomized Controlled Trial

Clinical and Physiologic Anorectal Function after Low Anterior Resection in Patients with Rectal Cancer: A Prospective Randomized Comparison of Straight and Colonic J-Pouch Anastomoses.: Choi, Hong Jo , Kim, Sung Heun , Park, Ki Jae; J Korean Soc Coloproctol. 2003;19(2):101-107.

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Abstract PDF: PURPOSE
The aim of this prospective study was to analyze anorectal physiologic and clinical outcomes of the colonic J-pouch-anal anastomosis compared with the traditional straight colorectal anastomosis after ultra-low anterior resection in patients with rectal cancer, thus to define if this method of modified reconstruction has a functional superiority.
METHODS
After total mesorectal excision for mid or low rectal cancers, patients were randomized to either a straight (n=23) or a colonic J-pouch anastomosis (n=24) to the lowermost rectum or anal canal. Functional outcomes were compared between two groups using an anorectal manometry performed before and 1 year after surgery and a bowel function questionnaire administered 6 months and 1 year postoperatively.
RESULTS
Except the arithmetic level of anastomosis which was significantly higher in straight group than in pouch group (5.1 +/- 1.2 cm vs. 3.8 +/- 0.9 cm; P=0.0001), the two groups were well matched for demographic distribution, pathologic stage, colonic segment used for neorectum and use of adjuvant therapies. Patients with colonic J-pouch anastomosis showed functional superiority in terms of frequency of bowel movements, degree of urgency at 6 months (P<0.0001 and =0.03, respectively) and 1 year postoperatively (P<0.0001 and <0.05, respectively). Functional parameters, including incontinence to liquid stool and impaired discrimination between gas and stool were more pronounced in straight group after 6 months (P=0.04, and <0.05, respectively), but the differences were not statistically significant after 1 year. Sensation of incomplete evacuation was not different statistically between groups at 6 months, but more common in J-pouch group at 1 year (39.1% vs. 8.3%; P=0.04). As well as the length of high pressure zone and presence of rectoanal inhibitory reflex, there was no difference in sphincter pressure parameters between groups either before or 1 year after surgery. Maximal tolerable volume of the neorectum in J-pouch group was 110.2 +/- 16.7 ml, which was significantly larger than that of 74.1 +/- 14.9 ml in straight group (P<0.0001), and the neorectum in J-pouch group was significantly more compliant than that in straight group (6.1 +/- 1.9 vs. 3.3 +/- 2.1; P<0.0001) in 1 year after surgery.
CONCLUSIONS
Construction of a colonic J-pouch as a substitute for the rectum restores neorectal volume and compliance. Clinically it offers patients superior anorectal function compared with straight anastomosis. To minimize evacuation difficulty associated with the pouch, optimal size of the pouch should be defined, thus to achieve an ideal balance between stool frequency/urgency and evacuation problems through larger prospective studies.

Original Articles

Malignant Melanoma of the Anorectal Region.: Kim, Duck Woo , Kang, Sung Bum , Heo, Seung Chul , Park, Kyu Joo , Bang, Yung Jue , Park, Jae Gahb; J Korean Soc Coloproctol. 2002;18(4):257-261.

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Abstract PDF: PURPOSE
Anorectal melanoma is an uncommon tumor that comprises less than 1% of all malignancies of the anorectum. Its epidemiologic features, and clinical characteristics have not been well studied. We reviewed our experience in management of malignant melanoma of anorectal region.
METHODS
Eight patients with malignant melanoma of anorectal region were treated at Seoul National University Hospital in the period of 1980-2001. They represented 0.36% of the 2,246 patients with colorectal cancer seen at Seoul National University Hospital during the same period.
RESULTS
Five patients were female. The median age was 60 years. Common presenting symptoms were decreased stool caliber (63%), and anal bleeding (50%). All lesions developed at the area between 2cm and 7cm from anal verge and could be palpated on digital rectal examination. Two patients had multiple hepatic metastases at initial presentation. Of the remaining 6, abdominoperineal resection was performed for 4 patients, and local excision for 2. During the follow-up period with median length of 11 months, local recurrence occurred in 1 patient and distant metastases occurred in 3. Metastatic disease involved lung and/or brain. Five patients died during the follow-up period and the length of mean survival was 12 months.
CONCLUSION
Malignant melanoma of anorectum seems to have a poor prognosis with an appreciable incidence of regional node metastases. Common symptoms were similar to those of common anorectal disease. But all lesions were palpable on digital rectal examination. Increased awareness of this rare condition may lead to early detection and therefore to improved results.

Measurement of External Anal Sphincter Function by Fatigue Rate Index.: Seong, Moo Kyung , Yoo, Young Bum; J Korean Soc Coloproctol. 2002;18(3):184-189.

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Abstract PDF: PURPOSE
Fatigue rate index (FRI) is one of relatively unknown parameters of anal manometry. It was devised to assess sustained voluntary contractibility of external anal sphincter muscle. We designed this study to determine the predictability of FRI in evaluating patients with symptoms of fecal incontinence.
METHODS
Consecutive male patients with fecal incontinence, those with prolapsed hemorrhoids but without any kind of incontinence symptom, and male healthy volunteers who have no anal symptom were grouped as A, B, C. Anal manometric parameters including FRI were measured and compared statistically among them.
RESULTS
All subjects were 84. Group A 27, Group B 33, and Group C 24. Their ages were 33.33+/-2.91 (mean SE), 39.27+/-2.80, and 50.81+/-4.33, respectively. Mean resting pressures (mmHg) were 78.11 6.56 for group A, 81.18+/-7.19 for group B, and 57.81+/-7.80 for group C. Maximum resting pressures (mmHg) were 98.67+/-9.69, 100.82+/-8.49, 78.13+/-10.26. Mean squeeze pressures (mmHg) were 229.11+/-18.72, 248.18+/-23.03, 156.94+/-17.89. Maximum squeeze pressures (mmHg) were 286.50+/-33.76, 298.59+/-27.83, 187.38+/-21.08. Resting radial asymmetries (%) were 18.85+/-2.81, 19.85+/-2.31, 28.70+/-4.79. Squeeze radial asymmetries were 15.73+/-2.90, 16.29+/-1.96, 16.47+/-2.95. Fatigue rates were 0.90+/-0.21, 1.17+/-0.15, 1.38+/-0.40. Fatigue rate indices (min.) were 3.76+/-0.41, 2.63+/-0.20, 1.94+/-0.26, respectively. Differences between group A and group C were statistically significant in mean squeeze pressure (P=0.0093), maximum squeeze pressure (P= 0.0190) and FRI (P=0.0008). Those between group B and group C were significant also in mean squeeze pressure (P=0.005), maximum squeeze pressure (P=0.0051), and FRI (P=0.0396). Multiple logistic regression analysis revealed that independently significant parameters were age (P= 0.002) and FRI (P=0.007). Cut-off point of FRI for incontinence with maximum sensitivity and specificity was 2.4min. by ROC (receiver operating characteristics) analysis.
CONCLUSION
FRI is a meaningful parameter in predicting fecal incontinence, which can be used in assessment of sphincter function and future treatment protocols.

Manometric Investigation of Anorectal Dysfunction in Patients with Progressive Systemic Sclerosis.: Choi, Hong Jo , Lim, Hyun Sung , Park, Ki Jae , Chung, Won Tae , Lee, Sung Won; J Korean Soc Coloproctol. 2002;18(2):83-88.

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Abstract PDF: PURPOSE
The aim of this study was to investigate the anorectal function in patients with progressive systemic sclerosis (PSS), thus to define the clinical role of anorectal manometry in the earlier diagnosis of anorectal involvement of PSS.
METHODS
Seventeen consecutive patients (all females) with PSS were evaluated with anorectal manometry by the stationary pullthrough technique using the 8-channel hydraulic capillary infusion system for anorectal function. Functional parameters of the manometry were compared between patients with PSS and 20 normal control subjects, matched for age and sex.
RESULTS
The mean resting pressure over the high pressure zone (HPZ) in patients with PSS was significantly lower than that in the control group (70.8 3.4 mmHg vs. 81.5 3.2 mmHg: P=0.046). The HPZ in patients with PSS was also significantly reduced compared with that in the control (1.5 0.1 cm vs. 2.5 0.1 cm: P=0002). The rectoanal inhibitory reflex (RAIR) was detected in only 10 patients (59%) in the PSS group, but was present in all except one (95%) in the control (P=0.022). More interestingly, RAIR in patients with PSS responded at a higher volume of the air insufflated than that in the control (74% vs. 30% at 20 cc, 21% vs. 30% at 30 cc, and 0% vs. 40% at 50 cc, respectively: P=0.031). Other functional parameters, including maximal squeeze pressure, minimal sensory and maximal tolerable volume of the rectum, and rectal compliance were not significantly different between two groups.
CONCLUSIONS
Anorectal involvement reflected by the anorectal manometric dysfunction may be rather an earlier event in patients with PSS. An awareness to perform an anorectal manometric study in every case of PSS may be necessary for earlier subclinical detection of anorectal involvement by the disease.

Clinical Significance of Colonoscopy in Patients with Benign Anorectal Disease.: Kim, Kyung Bo , Park, Hyun Chul , Oh, Jae Hwan; J Korean Soc Coloproctol. 2001;17(4):181-186.

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Abstract PDF: PURPOSE
Benign anorectal disease will often cause great concern to the patient and the practitioner about a more proximal colon pathology. The aim of this study is to evaluate the significance of routine colonoscopy for patients with benign anorectal disease.
METHODS
A retrospective analysis of 108 patients with benign anorectal disease who had undergone colonoscopic examination from April 1997 to August 1998 at Gil Medical Center was done.
RESULTS
The mean age of all patients was 43 years; the male-to-female ratio was 1:1.1. The diagnoses of anorectal disease were hemorrhoids in 84 cases, anal fissures in 13 cases, chronic anal pain syndrome in 6 cases, anorectal fistulas in 5 cases, and other in 9 cases. There were 37 patients (34.3%) with 53 abnormal findings:14 tubular adenomas, 11 inflammatory polyps, 4 hyperplastic polyps, 1 tuberculous colitis, 1 angiodysplasia, 6 diverticula, 6 nonspecific ileitis or colitis, 2 melanosis coli, 2 rectal ulcers, 2 ileal ulcers, and 3 other diseases. Among them, clinically significant lesions, such as neoplastic lesion, tuberculous colitis and angiodysplasia, were detected in 12 patients (11.1%). Because the lesions in 7 patients of the 12 patients were within the reach of sigmoidoscopy, only 5 patients (4.6%) needed a colonoscopic examination. In regard to neoplasms, patients presenting with anal bleeding and old age were not found to have a higher frequency of neoplasia. Also, the specific type of anorectal disease was not associated with an increased risk for colorectal neoplasia (P>0.05).
CONCLUSIONS
Sigmoidoscopy is a more acceptable primary diagnostic tool in patients with benign anorectal disease, but in patients with gastrointestinal symptoms, a high risk for colorectal cancer, suspicious inflammatory bowel disease, or fear of cancer, selective colonoscopy will be needed.

A Study of Anal Manometric Finding after Low Anterior Resection of Rectal Cancer.: Min, Byung Wook , Ryu, Keun Won , Kim, Seon Han , Choi, Sang Yong , Goo, Bum Hwan , Park, Young Tae , Moon, Hong Young; J Korean Soc Coloproctol. 2000;16(5):328-333.

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Abstract PDF: PURPOSE
Low anterior resection, irrespective of anastomotic technique, may be associated with frequent bowel movement and other bowel management difficulties. The aim of this study was to access the anorectal function after low anterior resection of the rectal cancer.
METHODS
We studied 28 patients who had mid and low rectal cancer (average 8.3 cm above the anal verge) had undergone low anterior resection using stapling suture devices (average level of anastomosis was 3.8 cm above anal verge) and anal manometry was undertaken 95 times preoperatively (N=28) and 3 month (N=26), 6 months (N=22) and 12 months (N=19) postoperatively from 1992 to 1995 in Korea University Guro Hospital.
RESULTS
Maximum resting pressure was reduced after resection (from 64.7 mmHg to 42.7 mmHg, change ?22 mmHg) but gradually increased and returned to preoperative level at 12 months postoperatively. Minimum perceived volume was decreased after operation (from 40.3 ml to 25 ml change of ?15.3 ml) and this change persist at 12 months postoperatively. Rectoanal inhibitory reflex was present in all patient before surgery but disappeared in most of the patient after operation. Reflex returned to normal in 4 of 22 patients at 6 months later and in 7 of 19 patients at 12 months after operation. Maximum squeezing pressure and maximum tolerable volume were not decreased after operation.
CONCLUSIONS
Anorectal function (maximum resting pressure, minimum perceived volume and rectoanal inhibitory reflex) was reduced immediately after low anterior resection of rectal cancer. But this functional changes returning to normal at 6 months and most of the patients had good function at 12 months after operation.

Randomized Controlled Trial

A Prospective Study on the Relationship between Postoperative Urinary Retention and Amount of Infused Fluid during Surgery of Benign Anal Diseases under Spinal Anesthesia.: Lee, Chai Young , Kim, Hee Cheol , Lee, Dong Hee; J Korean Soc Coloproctol. 1999;15(5):357-361.

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Abstract PDF: PURPOSE
Urinary retention is a frequent postoperative complication after benign anorectal surgery. Factors, known to affect postoperative urinary retention, are age, sex, anesthetics, operative method, operative time and perioperative fluid injection. This study was performed to know whether the incidence of urinary retention might be controlled by reducing the amount of perioperative fluid.
METHODS
Eighty patients underwent surgery for hemorrhoids and chronic anal fissures were allocated into two groups, fluid restriction group (n=37) and hydration group (n=43). All patients were consecutively randomized from May 1998 to January 1999 and they were under 50 years old without urologic abnormality. Fluid was infused at 100 ml/h from the midnight then it's rate was changed into 10 ml/h for 4 hours from the beginning of the anesthesia for the restriction group, whereas 1000 ml/h only during operation for the hydration group. Thereafter it was changed into the same rate with 100 ml/h on both groups.
RESULTS
There was no significant differences with regard to age, sex, operation time, degree of pain and use of analgesics between two groups. Although there was a significant difference in the total volume of the infused fluid (Restriction group: 53.4 119.5 ml versus Hydration group: 778.6 319.0 ml, mean SD, p<0.001). Catheterization was done in 29 patients of the restriction group (78.4%) and 37 patients of the hydration group (86.0%), respectively. The frequency of catheterization was 1.3 0.7 times in the former and 1.6 0.7 times in the latter group.
CONCLUSIONS
A strict restriction of fluid infusion appeared to be unnecessary for the purpose of preventing the urinary retention during surgery of benign anorectal diseases with spinal anesthesia.

Original Articles

Diagnosis of Anal Sphincter Injuries by Manometric Radial Asymmetry.: Seong, Moo Kyung , Cha, Hyung Hwan , Park, Ung Chae; J Korean Soc Coloproctol. 1999;15(2):131-136.

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Abstract PDF: PURPOSE
This study was undertaken to evaluate how well anorectal manometry diagnose anal sphincter injury, especially with regard to the parameter of radial asymmetry. METHODS: Anorectal manometry were performed in 27 male patients with anal fistula of transsphincteric type. The postoperative values of each manometric parameter including radial asymmetry (RA) were compared with preoperative ones. And also, the association between the sites of functional defect assessed by cross-sectional pressure data under station pull-through (SPT) technique and those of anatomical defect made by fistulotomy operation were determined.
RESULTS
Under rapid pull-through (RPT) technique, maximum resting pressure (MRP); 113.1 21.3 mmHg (preoperative value) vs 68.0 18.5 mmHg (p=.000) (postoperative value), RA of MRP; 16.7 3.7% vs 24.1 7.5% (p=.002), Maximum squeeze pressures (MSP); 199.0 35.2 mmHg, 169.6 48.7 mmHg (p=.006), RA of MSP; 15.5 3.7%, 22.8 3.5% (p=.000). Under SPT technique, MRP; 100.4 39.5 mmHg vs 71.2 34.6 mmHg (p=.000), RA of MRP; 16.3 7.9% vs 24.2 10.8% (p=.026), MSP; 299.1 71.6 mmHg vs 231.4 90.3 mmHg (p=.004), RA of MSP; 13.0 6.1% vs 22.0 8.4% (p=.001). Sites of functional defects interpreted upon SPT data were coincidental with sites of anatomical defects made by fistulotomy in 88.9% (MRP) and 92.6% (MSP) of cases.
CONCLUSIONS
Manometric radial asymmetry could be a useful parameter in diagnosing anal sphincter injury and locating the site of defect.

Posterior Sagittal Anorectal Myectomy for Repair of Hirschsprung's Disease.: Sin, Jin Yong , Oh, Nahm Gun; J Korean Soc Coloproctol. 1998;14(3):577-584.

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Abstract PDF: PURPOSE
In small portion of patients with Hirschsprung's disease, the aganglionic stagment extends only up to the mid-rectum. This report describes an innovative and effective posterior sagittal anorectal myectomy for curative repair of ultrashort segment Hirschsprung's disease in neonates.
METHODS
The procedure was performed on ten patients with ultrashort segment Hirschsprung's disease between 1995 to 1998. The procedure was performed by making a sagittal incision in midline posterior perineum to expose the posterior rectum.4 longitudinal strip of muscular layer is removed from the aganglionic portion of the anorectum from the upper rectum to the internal sphincter. The patients were followed postoperatively to determine the effectiveness of the procedure and to observe the presence of any complications.
RESULTS
Seven patients (70.0%) were under three months old. Operative biopsy showed that four patients had aganglionosis in the upper rectum, three patients in the middle rectum and three patients in the lower rectum. The posterior sagittal anorectal myectomy was successful in the treatment of ultrashort segment Hirschsprung's disease- symptom recurred for one patient due to total aganglionosis and for another patients due to rectosigmoid aganglionosis. These two patients received the staplingprocedure after colostomy. Some transient complications included mucosal perforation during surgery (30.0%) and incisional wound infection (20.0%).
CONCLUSION
For those neonates with ultrashort segment Hirschsprung's disease, the posterior sagittal autorectal myectomy should be considered a safe and effective method for treatment and confirmatory diagnosis. In addition, preliminary colostomy is not required prior to this procedure.

Reproducibility of Anal Manometric Measurement.: Sun, Kwan Woo , Seong, Moo Kyung; J Korean Soc Coloproctol. 1998;14(3):483-492.

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Abstract PDF: PURPOSE
Anorectal manometry has become a routine investigation for the evaluation of patients with anorectal disorders. However, the interpretation of such studies is confounded by the fact that controversial data are reported with regard to the same events. The aim of this study was to measure the reproducibility of the pressure profiles of anorectal manometry in healthy controls for standardization of their measurements.
METHODS
Manometric study was performed on different days with 7 days interval in 22 male healthy subjects with the use of a pneumohydraulic capillary perfusion system.
RESULTS
For resting pressures with rapid pull-through (RPT) technique, maximum pressure revealed 43.58, 19.8% and mean pressure, 16.02, 14.6% in the order of reproducibility coefficient and coefficient of variation. For resting pressures with stationary pull-through (SPT) technique, maximum pressure; 17.22, 12.2% and mean pressure; 14.66, 26.4%, respectively. For squeezing pressures with RPT technique, maximum pressure; 53.37, 14.3% and mean pressure; 66.32, 23.6%. For squeezing pressures with SPT technique, maximum pressure; 72.80, 11.9%, mean pressure; 93.10, 30.5% and coughing pressure; 69.42, 15.8%, respectively, For anal canal length (ACL) with RPT technique, at resting state; 7.10, 7.9% and at squeezing state; 14.55, 13.7%, respectively. For high pressure zone (HPZ) with RPT technique, at resting state; 6.68, 16.3% and at squeezing state; 11.06, 23.5%. For HPZ with SPT technique, at resting state; 11.28, 25.4% and at squeezing state; 10.04, 17.5%, respectively. For radial asymmetry (RA) with RPT technique, at resting state; 13.76, 42.3% and at squeezing state; 7.86, 22.9%. For RA with SPT technique, at resting state; 24.6, 58.6% and at squeezing state; 14.28, 46.7%, respectively.
CONCLUSION
Measurements of resting and squeezing pressure are more reproducible by SPT technique, in which technique it seems that maximum value is more preferred as a representative value. ACL and HPZ are may well measured on resting pressure with SPT technique. Radial asymmetry shows the best reproducibility on squeezing pressure with RPT.

Anorectal Physiology in the Rectal Prolapse Patient.: Son, Kyung Soo , Joo, Jae Sik , Wexner, Steven D; J Korean Soc Coloproctol. 1998;14(3):467-476.

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Abstract PDF: PURPOSE
The aim of our study was to evaluate the physiological spectrum of anorectal dysfunction among patients with full thickness circunferential rectal prolapse. MATERIAL AND METHODS: Between January 1988 and March 1995, 88 patients who visited department colorectal surgery, Cleveland Clinic Florida with rectal prolapse were studied. There were 8 males and 80 females, with a mean age 69 (range 28~101) years. Patients underwent a detailed history and the following anorectal physiology tests were performed: anal canal manometry, pudendal nerve terminal motor latency (PNTML) assessment, anal electromyography and cinedefecography.4 standard continence scoring system, based on the frequency and type of incontinence (0=full continence, 20=complete incontinence) was used. Patients with rectal prolapse (n=88) were divided into two subgroups: Group I=continent patients (n=33) and Group II= incontinent patients (n=55).
RESULTS
There were statistically significant differences between each group when comparing mean resting pressures, anal pressures, anal canal length, rectal compliance, rectoanal inhibitory reflex, increased fiber density, the occurrence of premature evacuation (p<0.001), and rectal capacity (p<0.05). However, dynamic changes of anorectal angle, resting anorectal angle, puborectalis length, and rectal sensitivity were not significantly different (p>0.05) between groups.
CONCLUSION
Continence may be disturbed in patients with rectal prolapse; knowledge of impairment in continence may assist in surgical management.

Posterior sagittal anorectoplasty, Secondary procedure, Anorectal malformation.: Park, Dong Soo , Park, Jin Su , Yoo, Soo Young; J Korean Soc Coloproctol. 1998;14(2):291-298.

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Abstract PDF: Eleven patients underwent posterior sagittal anorectoplasty(PSARP) as a secondary procedure. Two of them had rectovaginal fistula and another two had rectocutaneous fistula. Six of the rest complained of frequent fecal soiling and the last one had severe anorectal stricture after perineal anoplasty. Five patients had lived with colostomy until the second operations were carried out. The ages at the time of the secondary PSARP were between 7 months and 29 years. Distal colostogram and MRI were taken to evaluate distal colon, position of the rectum and voluntary muscle. All patients had normal sacrum except one who had anorectal stricture. Seven patients, six with fecal incontinence and the other one with rectovaginal fistula had mislocated anorectums. Three patients, two with rectocutaneous fistula, the other one with anorectal stricture, had abdominal approach to obtain enough length of colon for pull-through procedure. With the posterior midsagittal approach, we could manage all the problems, rectovaginal fistulas, rectocutaneous fistulas, strictures and malpositioned rectums, without difficulty. No patients had serious complications except wound infection in one. All patients were satisfied with the results after redo-PSARPs even though normal continence has been achieved in only one patient. Seven patients who had continuous soiling or rectocutaneous fistula, needed no more diapers even though four of them showed fecal staining under stressful condition and the other three showed intermittent fecal leaking less than once a day. The rest three of the patients maintained their continence with support of drugs and/or enemas because of constipation. The PSARP is a popular procedure as a primary operation; however, our results suggested that this procedure also gave us a good opportunity for management of serious complication developed after primary anoplasties.

Changes in Anal Pressure According to Age and Gender in Hemorrhoids and Anal Fissures.: Kim, Kwang Ho , Shim, Kang Sup , Park, Eung Bum; J Korean Soc Coloproctol. 1998;14(2):283-290.

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Abstract PDF: Hemorrhoid and anal fissure are common diseases in Korea. It has been demonstrated that patients with hemorrhoidal disease have increased activity of the internal anal sphincter. The fissure causes increased contraction in the internal anal sphincter, thereby increasing pressure in the anal canal. Many studies have reported differences in the anal canal pressures between males and females. Moreover, some papers have shown that sphincter pressures decrease with age. But the majority of these studies were not specific for the hemorrhoid and anal fissure. Therefore, we studied the effect of age and gender on anal pressure in hemorrhoid and anal fissure. Two hundred ninety six patients with hemorrhoid and sixty eight patients with anal fissure were retrospectively assessed. Anorectal manometry using a radial eight-port catheter was performed during resting and squeezing maneuvers of the anal sphincter. In hemorrhoid reduction in maximal average resting(MARP) and squeezing pressure(MASP) were found from the sixth decade, however in anal fissure reduction in MARP and MASP were found in the third decade. In hemorrhoid significant decrease of MARP and MASP were noted in entire ages of female, however in anal fissure increase of MARP and MASP were noted in fifth and sixth decade of female. In conclusion, in hemorrhoid both resting and squeezing pressure decrease with age in female. In anal fissure both resting and squeezing pressure decrease in third decade and in male with fifth and sixth decade.

Risk Factors of Recurrent Hemorrhoid after Primary Management.: Yong, Sung Sang , Joo, Jae Sik , Son, Kyung Soo , Lee, Ho Suk , Choi, Byung Soo , Lee, Sung Kyu; J Korean Soc Coloproctol. 1998;14(2):275-282.

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Abstract PDF: Before surgery for hemorrhoid, patients always have a worry of postoperative recurrence. The exact incidence and risk factors of recurrent hemorrhoid have not yet been delineated up to now. Therefore, the aim of this study was to assess the etiology of the recurrence after surgery. MATERIAL AND METHODS: Between March, 1997 and Feburary 1998, all patients who visited the Dept. of Surgery, Korea Veteran Hosipital, due to the recurrent hemorroid after surgical managememt including sclerotherapy(Group II: GII, n=60) were compared to the age and sex mathed(1:2) with primary hemorroid patients(group I: GI, n=120). The risk factors which might be related with the recurrence such as 1) hemorroidal factor(duration of symtom, symtom, associated perinial disease) 2) patient factor (constipation, incontience, cardiovascular disease, pulmonary and hepatic disease) 3) anorectal physiologic factors 4) surgical factors were evaluated. Stastical analysis were performed by a chi-square-test or Mann-Whitney U test and set the significance at p<0.05.
RESULTS
There were no differences between the two groups in terms of age(GI 58.1+/-8.5, GII 60.9+/-3.3 years), gender(M:F, GI; 97:23, GII; 56:4 ). The ratio of having a contipation before surgery was 41% in GI, 55% in GII. It was not statistically significant. However, the other factors related with constipation such as duration of constipation(GI; 9.85+/-7.73 years, GII; 14.62+/-7.38 years: p<0.05), duration of straining during defecation(GI; 5.82+/-2.34, GII; 7.32+/-5.6 minutes, p<0.05) number of laxative use(GI; 29, GII; 28) were significantly different between the two groups. The fecal incontince are 5% in group Iand 13% in group II. There were no differences in patient's subject symtoms related with hemorrhoid, and comorbid perianal disease between the two groups. In anorectal manometric findings, rectal complince was significantly lower in GII than that of GI(25.1+/-50.04 cc/cmH20 vs 16.0+/-25.2 cc/cmH20 p<0.05). GII has a significant number of preopertive hypertension than GI(6.7% vs. 21.6%, p<0.05). CONCLUSION: When a patient with hemorrhoid has a constipation or hypertension, and lower compliance in manometric findings, it would be related with the postoperative recurrence after treatment. Therefore, we surgeons should correct these comorbid conditions before surgery, otherwise give an information to the patient of high chance of postoperative recurrence after management.

Clinical Significance of Amplitude in Pudendal Nerve Conduction Study in Patients with Defecation Disorders.: Joo, Jae Sik , Kim, Jae Do; J Korean Soc Coloproctol. 1998;14(2):241-246.

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Abstract PDF: Many different kinds of anorectal physiologic studies were performed for the evaluation of defecation disorders. Some of these studies are anorectal manometry and pudendal nerve conduction study. In pudendal nerve conduction study, pudendal nerve terminal motor latency (PNTML) was considered to be very useful for the evaluation and management of these patients. However, evaluation of amplitude in pudendal nerve conduction study has been clinically seldom used. Therefore, the aim of this study was to evaluate the clinical significane of amplitude in pudendal nerve conduction study in patients with defecation disorders by comparing to manometric profiles. MATERIAL AND METHODS: Between February, 1997 and February, 1998 all patients who underwent pudendal nerve conduction study and anorectal manometry for the evaluation of defecation disorders (constipation and fecalincontinence) were analyzed. Latency as well as amplitude in pudendal nerve conduction study were compared in both groups to the pressure profiles in manometric study according to the subgroups of these patients. Statistical analysis were performed by a Chi-square or Student's t-test and significance was assumed when p<0.05.
RESULTS
A total of 80 patients, forty constipation with a mean age of 55.3+/-14.5 (GI: range; 24~86) years and forty fecal incontinence with a mean age of 61.1+/-10.3 (GII: range; 37~74) years and a male to female ratio of 25:15 (GI), 28:12 (GII), were studied. PNTML in both sides in GI were significantly decreased in comparision to those of GII (GI: Rt, 2.17+/-0.7 ms Lt, 2.03+/-0.5 ms, GII: Rt, 2.50+/-0.7 ms, Lt 2.64+/-0.8 ms, p<0.05), However, there were no differences between the two groups in terms of amplitudes (GI: Rt 399.0+/-348 uV, Lt 426.8+/-403 uV, GII: Rt, 406.9+/-273 uV Lt, 392.9+/-291 uV, NS) in pudendal nerve conduction study. In manometric findings, even though maximal resting, mean, minimum and maximal pushing pressures were no differences in both groups, mean resting and maximal squeezing pressure were significantly increased in GI than those of GII (GI: 82.4+/-31 cmH20, GII: 60.5+/-25 cmH20 in mean resting pressure, GI: 213.1+/-108 cmH20, GII: 178.7+/-66 cmH20 in maximal squeezing pressure, p<0.05) When we analyzed the overall values of amplitudes according to the diagnosis, age, gender, and the value of PNTML, there were no statistically significant differences between the two groups. But, when the one side of PNTML shorter than the other side, it tended to have a high amplitude in that side than that of the other side in the same patient (the probability for trend was 74%).
CONCLUSION
Constipation patient has a shorter PNTML, higher mean resting, and maximal squeezing pressure than fecal incontinene patient. The amplitude in pudendal nerve conduction study had a trend of inverse correlation to the latency in the same patient. Therefore, amplitude in pudendal nerve conduction study might be useful to monitor or predict the outcome after treatment in patients with defecation disorders.

Clinical and Physiologic Evaluation of Anorectal Function Following Low Anterior Resection.: Lee, Sang Jeon , Park, Yoon Sang; J Korean Soc Coloproctol. 1998;14(1):61-72.

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Abstract PDF: Twenty to twenty-five percent of patients are reported to experience problems with anorectal function after low anterior resection, complaining particularly urgency of defecation and minor fecal leakage, but the mechanisms underlying its cause and the recovery process are not well understood. We designed this study to elucidate the mechanism of anorectal functional problems and its recovery process after low anterior resection for rectal cancer by autonomic nerve preserving procedure. Standardized interviews and anorectal physiologic studies including balloon proctometry and manometry were performed in 32 patients preoperatively, and at 1 month, 3 months, 6 months and 1 year after the operation. Postoperatively stool frequency increased, the ability to defer defecation and discriminate stool characters were compromised, and anal incontinence scores increased, which recovered progressively by 6~12 months after the operation. Balloon proctometry showed that threshold volume, urgent volume and maximal tolerable volume decreased remarkably after the operation. The latter two parameters recovered considerably by 1 year after the operation. Rectal compliance also decreased significantly but it showed no evidence of recovery by 1 year after the operation. Anorectal manometry showed that maximum anal resting pressure decreased significantly after the operation which recovered significantly by 1 year after the operation. Maximum anal squeeze pressure showed no significant decrease after the operation. In most patients rectoanal inhibitory reflex was abolished after the operation, which recovered only in some cases by after 1 year. The group of short residual rectum(<4 cm, N=18) showed more impairment in continence and decrease in neorectal capacity and compliance than that of the long residual rectum(> or =4 cm, N=14). These results suggest impairment in fecal continence occurs due to decrease in rectal capacity, compliance, and anal canal pressure, and loss of rectoanal inhibitory reflex. Autonomic nerve preserving procedure could not prevent the decrease in resting anal pressure. Continence recovers clinically with increase in neorectal capacity, compliance and anal canal pressure but not with recovery of rectoanal inhibitory reflex. The length of the residual rectum seems to play an important role in the degree of impairment of continence and good continence can be expected when the residual rectum is more than 4 cm.

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