Variability of gallbladder emptying after oral stimulation

Area of Science:

• Gastroenterology
• Medical Imaging
• Physiology

Background:

• Intraindividual reproducibility of gallbladder (GB) volumes, both fasting and postprandial, remains inadequately established.
• Variability in postprandial GB motility requires further investigation.
• The biplane Simpson method offers a novel approach for GB volume determination via sonography.

Purpose of the Study:

• To assess the intraindividual reproducibility of fasting and postprandial gallbladder (GB) volumes.
• To evaluate the variability of postprandial GB motility using the biplane Simpson method.
• To validate the biplane Simpson method for accurate GB volume measurement.

Main Methods:

• Validated the biplane Simpson method in vitro and in vivo, comparing it against the sum-of-cylinders method.
• Examined postprandial GB emptying in 10 healthy volunteers over 108 minutes.
• Repeated measurements on days 1, 31, and 61 after a standardized test meal.

Main Results:

• The biplane Simpson method demonstrated high correlation with actual volumes (r = 0.99).
• Achieved intra- and inter-observer variation below 5% for GB volume measurements.
• Observed significant intraindividual fluctuations in fasting GB volume (1.9–24.0 ml) and considerable variability in GB emptying patterns.

Conclusions:

• The biplane Simpson method is confirmed as a reliable tool for measuring gallbladder volumes.
• Both fasting and postprandial GB volumes exhibit considerable intraindividual variability over a two-month period.
• Findings highlight the dynamic nature of GB function and the need for longitudinal assessment.