A Study of Antibiotic Prophylaxis in Unconscious Patients
A group of 72 comatose patients with no evidence of infection were studied in order to establish the influence of prophylactic antibiotics on their subsequent course. Of this group, 32 were treated with penicillin and streptomycin or tetracycline, and 10 received sulfisoxazole or nitrofurantoin; the remaining 30 patients served as controls and received no prophylactic therapy. It was found that there was no difference in mortality between the treated and the untreated groups. However, pulmonary complications developed in 45% of the prophylactically treated group whereas only 15% of the untreated patients developed such complications. In the treated group, bacteremia due to a gram-negative rod occurred in two patients who died. In addition, the usual nasopharyngeal flora of the treated patients was replaced by gram-negative rods. The authors conclude that "prophylactic antibiotic therapy is of no benefit, and is distinctly hazardous in unconscious patients."