Sigmoidometry: a method assessing sigmoid colon function

Area of Science:

• Gastroenterology
• Physiology
• Medical Engineering

Background:

• The sigmoid colon's mechanical properties and response to distension are crucial for bowel function.
• Quantitative assessment of sigmoid colon (SC) pressure and compliance is challenging.

Purpose of the Study:

• To introduce a novel method for quantitative and qualitative assessment of sigmoid colon (SC) volume, pressure, and compliance.
• To establish the sigmoidometrogram as a diagnostic tool for SC function.

Main Methods:

• Developed a sigmoidometrogram technique using CO2 inflation via a condom-tipped catheter to distend the SC.
• Measured SC pressure with a saline-perfused catheter and intra-abdominal pressure via a bladder catheter.
• Recorded pressure-volume data during distension and balloon expulsion in 12 healthy volunteers.

Main Results:

• The sigmoidometrogram curve comprises a 'tone limb' (distension) and an 'evacuation limb' (expulsion).
• Insignificant pressure increase during distension (P > 0.05), with minor fluctuations mirroring intra-abdominal pressure.
• Quantified SC volume, pressure, and compliance, enabling calculation of SC compliance.

Conclusions:

• The sigmoidometrogram provides quantitative and qualitative insights into sigmoid colon (SC) function.
• A normal sigmoidometrogram suggests intact SC wall structure and neural pathways.
• Abnormalities in the SC pathway are expected to alter sigmoidometrogram measurements and curve morphology.