Postoperative hemorrhage associated with carbenicillin administration. Report of two cases and review of the literature.

Two patients receiving preoperative carbenicillin manifested platelet dysfunction and severe wound hemorrhage. Platelet transfusions appeared beneficial. Investigations indicate that hemostatic abnormalities, especially platelet aggregation defects, may be produced by carbenicillin. Extreme caution and awareness of possible hemorrhage are advised when carbenicillin is used preoperatively.