The role of CT scan in evaluation for laparotomy in patients with stab wounds of the abdomen.

Not every patient with a penetrating stab wound of the abdomen requires laparotomy. This report evaluates use of computerized tomographic (CT) scan in assessment of stable asymptomatic patients, with penetrating abdominal stab wounds, as an indicator of the necessity of abdominal exploration. In a prospective study, 50 patients with abdominal stab wounds were treated successfully with observation only, after admission abdominal CT scan interpretation was negative for pathology in 45 patients. In the remaining five it was of such minor nature that conservative management was justified (Series I). Twenty-eight stable asymptomatic patients with penetrating stab wounds of the abdomen comparable to the ones in Series I had CT scan on admission, and then underwent exploratory laparotomy independent of their CT scan findings (Series II). Of these 28 patients, 22 had correct CT scan findings verified by laparotomy, three were false positive for intra-abdominal injury resulting in negative explorations, and three patients had such nonspecific findings as fluid or air in the abdomen incompatible with precise organ injury identification. Our study shows that CT scan in patients with abdominal stab wounds identifies solid organ injury with great specificity and sensitivity, evaluates the retroperitoneum well, and detects peritoneal penetration by demonstrating intraperitoneal fluid or air. CT scan was unreliable in detection of bowel injury and does not demonstrate diaphragmatic injuries.