Acute cholecystitis is the inflammation of gallbladder caused by obstruction of cystic duct and bacterial invasion; Its typical clinical feature is paroxysmal colic in the right upper abdomen, accompanied by obvious tenderness and abdominal muscle rigidity. About 95% of patients have gallstones, which is called calculous cholecystitis; 5% of the patients were not complicated with gallstones, which was called non calculous cholecystitis. Cholecystitis is a common disease. In China, it is reported in the literature that it ranks second in acute abdominal surgical diseases, second only to acute appendicitis, more common than acute intestinal obstruction and ulcer perforation. In recent 10 years, with the popularization and wide application of B-ultrasound, it has provided a powerful tool for the detection and diagnosis of cholecystitis and biliary tract diseases, and significantly improved the detection rate and accuracy of biliary tract diseases. The onset of acute cholecystitis is due to stones blocking the cystic duct, resulting in bile retention in the gallbladder and secondary bacterial infection. In acute non calculous cholecystitis, the cystic duct is often not blocked. The etiology of most patients is unclear. It often occurs after trauma or some abdominal operations unrelated to the biliary system. Acute cholecystitis is a common disease. It is an acute chemical and / or bacterial inflammation of the gallbladder. About 95% of patients have gallstones, which is called calculous cholecystitis; 5% of patients without gallstones are called non calculous cholecystitis.
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