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Dynamic cholescintigraphy: induction and description of gallbladder emptying
D B Toftdahl1, L Højgaard, K Winkler
1Department of Medical Gastroenterology, Hvidovre Hospital, University of Copenhagen, Denmark.
Summary
Mean ejection fraction (EF) is the best parameter for assessing gallbladder emptying. Slow infusion of cholecystokinin-octapeptide (CCK-8) is preferred over bolus injection for more complete and comfortable gallbladder emptying.
Area of Science:
- Gastroenterology
- Nuclear Medicine
- Diagnostic Imaging
Background:
- Accurate assessment of gallbladder emptying is crucial for diagnosing biliary disorders.
- Current methods for stimulating gallbladder contraction, like cholecystokinin-octapeptide (CCK-8), have varying efficacies and side effect profiles.
Purpose of the Study:
- To determine the optimal parameter for quantifying gallbladder emptying.
- To compare the effectiveness and tolerability of bolus injection versus continuous infusion of CCK-8 for inducing gallbladder emptying.
Main Methods:
- Dynamic cholescintigraphy was used to measure gallbladder emptying in healthy subjects and patients with gallstones.
- Two methods of CCK-8 administration were compared: continuous infusion (0.3 ng/kg/min for 60 min) and bolus injection (0.04 microgram/kg).
- A novel parameter, mean ejection fraction (EF), was defined and compared to existing parameters (EFmax, EF30).
Main Results:
- Mean EF demonstrated superior reproducibility compared to EFmax and EF30 in healthy subjects and showed similar reproducibility in patients with gallstones.
- Continuous infusion of CCK-8 resulted in significantly more complete gallbladder emptying (mean EF 49%) than bolus injection (mean EF 16%).
- Bolus injection of CCK-8 caused abdominal discomfort in all subjects, while infusion was well-tolerated.
Conclusions:
- Mean EF is the most reliable parameter for describing gallbladder emptying.
- Continuous, slow infusion of a physiological dose of CCK-8 is the preferred method for inducing gallbladder emptying due to its efficacy and safety profile.