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Dynamic study of the rectal detrusor activity at defecation
1Department of Surgery and Research, Faculty of Medicine, Cairo University, Egypt.
Digestion
|January 1, 1991
Summary
Rectal pressure dynamics during defecation differ between healthy individuals and those with constipation. Constipated patients exhibit sustained high rectal pressure throughout evacuation, unlike normal subjects.
Area of Science:
- Gastroenterology
- Physiology
- Urology
Background:
- Defecation involves complex rectal and intra-abdominal pressure dynamics.
- Understanding these dynamics is crucial for diagnosing and managing defecation disorders.
Purpose of the Study:
- To investigate and compare rectal detrusor dynamics during defecation in normal and constipated subjects.
- To identify quantitative parameters that differentiate normal from abnormal defecation patterns.
Main Methods:
- Simultaneous measurement of rectal pressure using a ureteral catheter.
- Intra-abdominal pressure monitoring via a Foley catheter in the urinary bladder.
- Fecal flow assessment using fecoflowmetry.
Main Results:
- Normal subjects showed a pre-evacuation rectal pressure peak followed by a gradual decrease during fecal flow.
- Constipated subjects maintained elevated pre-evacuation rectal pressure throughout the entire evacuation process.
- Quantitative analysis revealed significant differences in opening pressure, time, pressure time, and evacuation pressure between groups.
- Intra-abdominal pressure significantly contributes to the increase in rectal pressure during defecation.
Conclusions:
- Rectal pressure dynamics during defecation are significantly altered in patients with constipation.
- Quantitative analysis of rectal pressure curves can effectively distinguish between normal and constipated defecation.
- Intra-abdominal pressure plays a key role in the defecation mechanism.