Acute acalculous cholecystitis in critically injured patients. Preoperative diagnostic imaging.

The potential lethality and predisposing factors of acute acalculous cholecystitis (AAC) are well established; however, preoperative diagnosis remains a challenge. This update of a previous report of 30 cases of AAC at a Level I trauma center describes 14 multiply injured patients who developed AAC and underwent cholecystectomy. All 14 patients had acutely inflamed gallbladders; 6 (42.8%) had areas of necrosis or gangrene. The mortality rate was 7% (1 patient). While the percentage of patients receiving prolonged intensive care (100%), narcotic analgesics (100%), and TPN (93%) correlates with the experience cited previously, the percentage undergoing preoperative diagnostic imaging is unusually high, reflecting a heightened suspicion for AAC. Computed tomographic or sonographic evidence of gallbladder wall thickness greater than or equal to 4 mm, pericholecystic fluid or subserosal edema without ascites, intramural gas, or a sloughed mucosal membrane was considered diagnostic criteria for AAC. We conclude that preoperative computed tomogram or ultrasound imaging leads to earlier recognition of this life-threatening problem.