Small bowel motility in functional chronic constipation.

Area of Science:

• Gastroenterology
• Digestive Physiology
• Motility Disorders

Background:

• Functional constipation comprises slow-transit constipation (STC), normal-transit constipation (NTC), and outlet delay (OD).
• Extracolonic manifestations, particularly disturbed small bowel motility, are recognized in STC but less studied in NTC and OD.

Purpose of the Study:

• To investigate small bowel motility using 24-hour ambulatory jejunal manometry in patients with chronic constipation subtypes.
• To identify pathophysiological differences and potential underlying mechanisms, such as enteric neuropathy, across constipation types.

Main Methods:

• Conducted 24-hour ambulatory jejunal manometry on 61 chronic constipation patients (STC, NTC, OD) after standardized meals.
• Utilized transit-time studies, anorectal manometry, defecography, and colonoscopy for comprehensive patient assessment.
• Compared manometric data with 50 healthy subjects, employing both computerized and visual analysis.

Main Results:

• Small bowel motor abnormalities were observed in all STC (n=32) and 94% of NTC (n=16) patients, but none with OD (n=8).
• Abnormalities included severe disruptions (loss of migrating motor complex) and subtle parameter changes, detectable by computerized analysis.
• No significant manometric differences were found between STC and NTC patients, suggesting a common underlying enteric neuropathy.

Conclusions:

• 24-hour ambulatory jejunal manometry provides valuable insights into the pathophysiology of STC and NTC functional constipation.
• Findings strongly suggest an underlying enteric neuropathy in both STC and NTC, though distinct manometric features are lacking for differentiation.