[How to reduce the number of negative appendectomies? A prospective two-center study of 120 patients].

A decisional protocol based on clinical findings and laboratory data was assessed prospectively in a consecutive series of 120 patients with suspected appendicitis over a 24-month period at 2 teaching hospitals. Using this protocol the high rate of negative appendectomy (31.5%) during the 2 years prior to the study was reduced to 22% without increasing morbidity or mortality. Ultrasound examination was poorly predictive in unclear cases. Laparoscopy was used to assess diagnosis in persistent symptoms.