Studies of at least six patients with acute cholecystitis treated with percutaneous ultrasound-guided or computed tomography-guided cholecystostomy were eligible for inclusion in the review. Eligible studies had to report at least two of the outcomes: procedure attempted; complications; mortality; therapeutic effects; and frequency of surgical intervention and/or perioperative mortality. Case reports, reviews, methodological papers and papers that described laparoscopic or open cholecystostomy procedures were excluded. Studies that assessed PC for gallstone extraction, crushing or dissolution were excluded, as were studies carried out in the same hospital with overlapping time periods (to avoid the duplication).
Some patients in the included studies received more than one PC. Mean age of included participants ranged from 52 to 85 years (mean 68.1 years). Seventy-nine percent of the included studies reported whether patients had gallstones. Mean percentage of patients with gallstones was 69% (range 0% to 100%). Most studies were carried out in Europe or USA. Studies were published between 1984 and 2005.
The authors did not state how papers were selected for review.