Bile acid pool size was measured in 10 Chinese without gallstones, 14 with pigment stones, and 10 with mixed stones by an isotope dilutin technique. Functional status of gallbladder was evaluated by intravenous cholecystogram and its gross appearance at surgery. Biliary lipid composition was also determined. The control subjects had a bile acid pool size comparable to that of Caucasians. Regardless of the nature of gallstones, bile acid pools of stone patients with functioning gallbladder were within normal range, whereas the pools of those with non- or poorly-functioning gallbladder diminished to about two-thirds of the control. Thus, the diminution of bile acid pool size was apparently the consquence of loss of storage function of gallbladder rather than the cause of production of lithogenic bile. The common bile duct bile obtained from stone patients with nonfunctioning gallbladder had a relatively high lithogenic index, at least partly related to its low total lipid concentration.
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