Simplified calculation of bile cholesterol saturation index

摘要

>Gallstones (cholelithiasis) are masses in the gallbladder or biliary tract that are caused by abnormally high levels of either cholesterol or bilirubin in bile [1]. It is a multifactorial disease and the main pathogenesis is the increased secretion of bile cholesterol,which can increase the cholesterol saturation index (CSI) of bile.Patients with CSI greater than 1 are more likely to develop gallstones.Bile is a kind of dark green to yellowish-brown liquid containing> 90% water.Cholesterol,lecithin and bile salts are the three main lipid species in bile and combined to form the main components of gallstones[1].