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Parameters of the rectoanal inhibitory reflex in patients with idiopathic fecal incontinence and chronic constipation.
Dis Colon Rectum. 1998 Feb; 41(2):200-8.DC

Abstract

PURPOSE

The rectoanal inhibitory reflex is a response of the internal anal sphincter to rectal distention, reflecting the functional nature of the anal sampling mechanism of rectal discrimination. The aim of this study was to assess the parameters of the rectoanal inhibitory reflex in healthy volunteers and incontinent and symptomatically constipated patients.

METHODS

The rectoanal inhibitory reflex was recorded in 42 patients using reproducible threshold volumes. Excitatory and inhibitory latencies, maximum excitatory and inhibitory pressures, amplitude, and slope of inhibition, slope and time of pressure recovery, and area under the inhibitory curve were estimated. Pudendal nerve terminal motor latency and endoanal magnetic resonance imaging were performed in all incontinent patients.

RESULTS

Significant linear trends were found for most parameters at each sphincter level when analyzed. Recovery time and area under the inhibitory curve differed between the sphincter levels and patient groups, with the most rapid recovery occurring in the distal sphincter of incontinent patients (P < 0.001). These pressure findings were not accounted for by differences in excitation between patient groups.

CONCLUSION

A coordinated response by the internal anal sphincter to rectal distention with recovery of anal pressure from the distal to the proximal sphincter is suggested. Continence may rely on the character of internal anal sphincter inhibition, and recovery and preoperative assessment of rectoanal inhibitory reflex parameters may be important for predicting functional result following low anastomosis.

Authors+Show Affiliations

Academic Department of Colorectal Surgery, Hammersmith Hospital, London, United Kingdom.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

9556245

Citation

Zbar, A P., et al. "Parameters of the Rectoanal Inhibitory Reflex in Patients With Idiopathic Fecal Incontinence and Chronic Constipation." Diseases of the Colon and Rectum, vol. 41, no. 2, 1998, pp. 200-8.
Zbar AP, Aslam M, Gold DM, et al. Parameters of the rectoanal inhibitory reflex in patients with idiopathic fecal incontinence and chronic constipation. Dis Colon Rectum. 1998;41(2):200-8.
Zbar, A. P., Aslam, M., Gold, D. M., Gatzen, C., Gosling, A., & Kmiot, W. A. (1998). Parameters of the rectoanal inhibitory reflex in patients with idiopathic fecal incontinence and chronic constipation. Diseases of the Colon and Rectum, 41(2), 200-8.
Zbar AP, et al. Parameters of the Rectoanal Inhibitory Reflex in Patients With Idiopathic Fecal Incontinence and Chronic Constipation. Dis Colon Rectum. 1998;41(2):200-8. PubMed PMID: 9556245.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Parameters of the rectoanal inhibitory reflex in patients with idiopathic fecal incontinence and chronic constipation. AU - Zbar,A P, AU - Aslam,M, AU - Gold,D M, AU - Gatzen,C, AU - Gosling,A, AU - Kmiot,W A, PY - 1998/4/29/pubmed PY - 1998/4/29/medline PY - 1998/4/29/entrez SP - 200 EP - 8 JF - Diseases of the colon and rectum JO - Dis. Colon Rectum VL - 41 IS - 2 N2 - PURPOSE: The rectoanal inhibitory reflex is a response of the internal anal sphincter to rectal distention, reflecting the functional nature of the anal sampling mechanism of rectal discrimination. The aim of this study was to assess the parameters of the rectoanal inhibitory reflex in healthy volunteers and incontinent and symptomatically constipated patients. METHODS: The rectoanal inhibitory reflex was recorded in 42 patients using reproducible threshold volumes. Excitatory and inhibitory latencies, maximum excitatory and inhibitory pressures, amplitude, and slope of inhibition, slope and time of pressure recovery, and area under the inhibitory curve were estimated. Pudendal nerve terminal motor latency and endoanal magnetic resonance imaging were performed in all incontinent patients. RESULTS: Significant linear trends were found for most parameters at each sphincter level when analyzed. Recovery time and area under the inhibitory curve differed between the sphincter levels and patient groups, with the most rapid recovery occurring in the distal sphincter of incontinent patients (P < 0.001). These pressure findings were not accounted for by differences in excitation between patient groups. CONCLUSION: A coordinated response by the internal anal sphincter to rectal distention with recovery of anal pressure from the distal to the proximal sphincter is suggested. Continence may rely on the character of internal anal sphincter inhibition, and recovery and preoperative assessment of rectoanal inhibitory reflex parameters may be important for predicting functional result following low anastomosis. SN - 0012-3706 UR - https://www.unboundmedicine.com/medline/citation/9556245/Parameters_of_the_rectoanal_inhibitory_reflex_in_patients_with_idiopathic_fecal_incontinence_and_chronic_constipation_ L2 - http://link.springer.com/article/10.1007/bf02238249 DB - PRIME DP - Unbound Medicine ER -