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Paracervical block is a controversial method for obstetrical analgesia, warmly advocated by some groups but abandoned or even forbidden by others because of its inherent risk for fetal bradycardia and asphyxia. In Sweden about 6000 women in labour are given paracervical block each year. An extensive survey of the literature failed to reveal any specific negative factors [4]. In a study of the biochemical changes of maternal and fetal blood during paracervical block fetal bradycardia was encountered in 50 per cent and was strongly correlated to maternal hyperventilation [2]. The apparently final condemnation of the technique came when a fall in fetal transcutaneous p02 (tcp02) was noted in all the ten cases studied [1]. If fetal tcp02 always falls after paracervical block additional negative factors, such äs placental insufficiency or maternal hyperventilation would reduce fetal oxygenation below a critical threshold Because of the importance of the problem and our experience with the fetal tcp02 technique we repeated these studies:

Human fetal transcutaneous pO 2 during paracervical block