Colonic motor abnormalities in slow transit constipation defined by high resolution, fibre-optic manometry

Area of Science:

• Gastroenterology
• Colorectal Physiology
• Neurogastroenterology

Background:

• Slow transit constipation (STC) is linked to colonic motor abnormalities of unclear origin.
• Healthy colons exhibit a distal propagating motor pattern (2-6 cpm) responsive to meals, indicating extrinsic neural control.
• Investigating meal responses in STC patients is crucial for understanding disease mechanisms.

Purpose of the Study:

• To characterize the colonic motor response to a meal in patients with STC.
• To compare meal-induced colonic activity in STC patients with healthy controls.

Main Methods:

• High-resolution fiber-optic manometry with 72 sensors was used in 14 STC patients and 12 healthy adults.
• Recordings were taken for 2 hours before and after a 700 kCal meal.
• Catheters were placed in the ascending or transverse colon.

Main Results:

• A cyclic propagating motor pattern was present in most STC patients before and after meals.
• Unlike in healthy individuals, meals did not significantly increase this motor pattern in STC patients (7.4 vs. 8.3 per/2h).
• Healthy subjects showed a dramatic increase in motor patterns post-meal (8.3 vs. 59.1 per/2h; p < 0.001).

Conclusions:

• Meals fail to stimulate the normal increase in distal colonic motor patterns in STC patients.
• These findings suggest attenuated extrinsic parasympathetic input to the colon in STC.
• This points to a potential neural basis for colonic dysfunction in slow transit constipation.