Urorectodynamics in patients with colonic inertia

Area of Science:

• Gastroenterology
• Neurology
• Urology

Background:

• Colonic inertia is a condition characterized by severe constipation due to impaired colonic motility.
• The underlying pathophysiology of colonic inertia is not fully understood, but autonomic dysfunction is suspected.
• Autonomic neuropathic lesions can affect gastrointestinal and bladder function.

Purpose of the Study:

• To investigate bladder and rectal pressure responses to bethanechol in female patients with colonic inertia.
• To compare these responses with those of healthy control women.
• To explore the potential role of autonomic neuropathy in colonic inertia.

Main Methods:

• Manometric evaluation of bladder and rectal cavities in 16 female patients with colonic inertia and 12 controls.
• Subcutaneous injection of bethanechol (0.035 mg/Kg).
• Measurement of intraluminal pressures and time to peak pressure in both organs.

Main Results:

• Bethanechol increased bladder intraluminal pressure by over 15 cm H2O in 31% of patients, compared to none of the controls.
• Maximal bladder pressure was significantly higher in patients (11.5 +/- 1.6 cm H2O) than controls (8.5 +/- 1 cm H2O).
• Rectal intraluminal pressure was significantly higher in patients (23 +/- 4 cm H2O) than controls (11.9 +/- 1.4 cm H2O).
• Peak pressure was reached faster in the bladder and rectum of patients compared to controls.

Conclusions:

• Patients with colonic inertia exhibit altered bladder and rectal pressure responses to bethanechol.
• These findings suggest an underlying autonomic neuropathic lesion in patients with colonic inertia.
• The study supports the hypothesis of autonomic dysfunction contributing to the pathophysiology of colonic inertia.