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Balloon expulsion from the rectum in constipation of different types
Gut
|October 1, 1985
Summary
Chronic constipation involves a defecatory mechanism disorder, not an inability to increase intrarectal pressure. Balloon expulsion tests reveal difficulties in constipated patients, particularly those with slow transit or megarectum.
Area of Science:
- Gastroenterology
- Physiology
Background:
- Chronic constipation affects a significant portion of the population.
- Understanding the defecatory mechanism is crucial for effective treatment.
Purpose of the Study:
- To investigate the defecatory mechanism in patients with chronic constipation using a balloon model.
- To assess intrarectal pressure and balloon expulsion ability in different constipation subtypes.
Main Methods:
- A balloon expulsion test was performed on 15 controls and 39 constipated patients.
- Intrarectal pressure was measured during straining.
- Patients attempted to expel balloons of varying volumes in lateral and sitting positions.
Main Results:
- Constipated patients, especially those with slow transit or megarectum, had significantly impaired balloon expulsion compared to controls.
- Intrarectal pressures during straining were not significantly different between controls and constipated patients with normal transit.
- Patients with megarectum showed higher intrarectal pressures than controls.
Conclusions:
- A defecatory mechanism disorder is present in various types of chronic constipation.
- The primary issue in these patients is not an impaired ability to generate intrarectal pressure.
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