Abstract
Eight hundred and forty-five blocks were administered to patients in labor, and fetal heart tones were monitored frequently following the blocks: Fetal heart rate changes were noted following 30 per cent of the blocks; primiparity, prematurity, and pre-existing fetal distress were associated with increased incidence of these changes. The incidence of neonatal depression was significantly increased at one and five minutes of age in those infants who had developed fetal heart rate changes following paracervical block. Paracervical blocks not followed by fetal heart rate changes were associated with a normal incidence of neonatal depression. No method for reliably predicting or preventing these fetal heart rate changes in any given patient was discovered.
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