The effect of fetal monitoring on the incidence of cesarean section.

To determine whether routine fetal monitoring inevitably increases the cesarean section rate, we studied the pertinent literature and analyzed the cesarean sections performed at Evanston Hospital during the last 8 years. Many authors have found a slight to moderate increase in cesarean section rates, whereas others have found no change or a decrease. At Evanston Hospital, the primary cesarean section rate has increased from 2.6% in 1968-1969 to 6.9% in 1974-1975. Only 19.2% of this increase is due to increased fetal distress; the magnitude of the increase is due to changes in other factors, notably, breech deliveries (29.5% of the increase) and "dystocia" (60.2% of the increase). The incidence of cesarean section is controlled by several complex variables, only one of which is fetal monitoring. To describe the fetal monitors as the cause of the increased cesarean section rate is to ignore these other equally profound changes in obstetric technic and philosophy.