Risk factors for fever, endometritis and wound infection after abdominal delivery

Risk factors for postoperative fever, endometritis and wound infection were analyzed in 761 consecutive cesarean sections. Postoperative fever was observed in 12%, endometritis in 4.7% and wound infection in 3% of cases. The relative risk for postoperative fever was increased in cases with postoperative hematoma (relative risk = 16.0), in cases with blood loss over 500 g (relative risk = 1.8) and if the duration of labor exceeded 6 h (relative risk = 1.9). The only significant risk factors for endometritis were amnionitis (relative risk = 8.7), postoperative hematoma (relative risk = 5.0) and age under 24 years (relative risk = 3.0). Wound infections were less frequent in cases with previous cesarean sections (relative risk = 0.15) and after elective cesarean sections (relative risk = 0.22), but duration of operation over 1 h (relative risk = 2.8), induction of labor (relative risk = 3.2) and puerperal endometritis (relative risk = 7.9) increased the risk of wound infection. By elimination of amnionitis and postoperative hematomas the rate of endometritis would have diminished only from 4.7% to 3.8%, a percentage equally unacceptable; diagnostics and prevention should be directed to young patients undergoing caesarean section. Besides technical procedures prevention of endometritis is important for the prevention of wound infection. In hospitals with low postcesarean infectious morbidity antibiotic prophylaxis seems to be unwarranted.