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Rectal hyposensitivity: pathophysiological mechanisms
M A Gladman1, Q Aziz, S M Scott
1Institute of Cell & Molecular Science, Barts and The London School of Medicine & Dentistry, Whitechapel, London, UK. m.a.gladman@qmul.ac.uk
Neurogastroenterology and Motility
|December 17, 2008
Summary
Rectal hyposensitivity (RH) in constipation patients often stems from rectal distension issues. This study found RH can be due to abnormal rectal size/compliance or impaired nerve sensitivity, guiding better patient management.
Area of Science:
- Gastroenterology
- Neurogastroenterology
- Physiology
Background:
- Rectal hyposensitivity (RH) is reduced perception of rectal distension.
- It may result from afferent nerve dysfunction or rectal structural/biomechanical changes.
Purpose of the Study:
- To investigate the contributions of rectal diameter, compliance, and afferent nerve sensitivity in patients with RH.
- To differentiate underlying pathophysiological mechanisms of RH in constipation.
Main Methods:
- Systematic evaluation of rectal diameter, compliance, and electrosensitivity in 45 constipated patients with RH.
- Comparison with 20 patients with normal rectal sensitivity and 20 healthy volunteers.
- Utilized fluoroscopy, isobaric distension, and electrical stimulation for assessments.
Main Results:
- 51% of RH patients had increased rectal diameter and/or compliance; 33% had normal diameter/compliance but elevated electrosensitivity thresholds.
- 16% had increased rectal diameter only, with some showing elevated electrosensitivity.
- Findings suggest mixed mechanisms contributing to RH, including structural and neural factors.
Conclusions:
- RH in constipation involves diverse mechanisms, including altered rectal biomechanics and impaired afferent nerve function.
- Subgrouping RH patients based on these mechanisms may inform targeted therapeutic strategies.
- Understanding these subgroups is crucial for optimizing management of rectal hyposensitivity.
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