Annals of Coloproctology

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Original Article

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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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.

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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

Case Reports

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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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

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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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.

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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

Original Articles

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.

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.

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.

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.

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