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Division of Nuclear Medicine, Department of Radiology, Georgetown University Hospital, Washington, DC
Correspondence: For reprints contact: Harvey A. Ziessman, MD, Division of Nuclear Medicine, Georgetown University Hospital, 3800 Reservoir Rd., NW, Washington, DC 20007.
ABSTRACT
The purpose of this study was to investigate alternative methods of infusing sincalide for calculation of a gallbladder ejection fraction (GBEF) during cholescintigraphy (5 mCi 99mTc-mebrofenin). After gallbladder filling, three methods of infusion were compared in 23 normal volunteers: (1) 0.02 µg/kg as a 3-min infusion, (2) 0.02 µg/kg as a 30-min infusion, and (3) 0.01 µg/kg as a 30-min infusion (14 subjects), all performed on separate days. With the 3-min infusion, the emptying pattern was usually exponential and completed in 15 min. The mean (GBEF) was 52% ± 26% at 20 min and 56% ± 27% at 30 min (range 0%–100%). GBEFs were less than 35% in six subjects and 35%–38% in four. Side effects were noted by 11/23 subjects. With the slow infusions, emptying was linear; no side effects were noted. With 0.02 µg/kg, the mean GBEF was 50%±27% at 20 min and 70% ± 22% at 30 min (range 26%–95%). Similar results were seen with 0.01 µg/kg, but the data were more limited. The 30-min infusion had a higher normalcy rate than the 3-min method (91% versus 74%). Females had significantly lower GBEFs than males (p < 0.05%). We conclude that the slow infusion method is preferable; it is more physiological, results in more complete emptying, has no side effects, has less normal variability, and should improve the specificity of this test. The lower mean female GBEF may have pathophysiological significance.
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