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Objective: To investigate the efficacy and safety of intrapartum fetal pulse oximetry, as a predictor of metabolic acidosis at birth of fetuses with intrauterine growth retardation (IUGR). Study Design: We studied 18 IUGR fetuses (group I) and a control group of 30 appropriate for gestational age (AGA) fetuses (group II) during labor. Both groups had abnormal fetal heart rate tracings and were monitored simultaneously throughout labor with cardiotocography and fetal pulse oximetry. Apgar scores, pH and base excess of fetal blood obtained from the umbilical artery after delivery were compared in both groups. Setting: The Fetal Surveillance Unit of the 2nd Department of Obstetrics and Gynecology, Aretaieion Hospital, Medical. School, Athens University. Results: In IUGR fetuses, when their oxygen saturation value (FSPO2) was less than 34%, cord artery pH was 7.10 +/- 0.04, base excess-13 +/- -1 mmol/l and Apgarscores less than or equal to 5 at the 5th min, and when FSPO2 was over 35%, artery pH was 7.29 +/- 0.08, base excess -8 +/- -2 mmol/l and Apgar scores greater than or equal to 7 at the 5th minute. In cases of drops of FSPO2 below 30% for more than 2 min, labor was completed operatively and cord pH was 7.00 +/- 0.04, base excess -15 +/- -2 mmol/l and Apgar scores less than or equal to 5 at the 5th minute. In AGA fetuses, when FSPO2 was over 30%, artery pH was over 7.20, base excess |
