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The variability of fetal heart rate, expressed as oscillation amplitude, was correlated to fetal tcPO2 in mothers during normal labor without administering analgesics. There was no correlation between tcPO2 levels and FHR variability. Changes in tcPO2 occurred in a few cases simultaneously with FHR variability, but no consistent pattern could be established.
The variability of fetal heart rate, expressed as oscillation amplitude, was correlated to fetal tcPO2 in mothers during normal labor without administering analgesics. There was no correlation between tcPO2 levels and FHR variability. Changes in tcPO2 occurred in a few cases simultaneously with FHR variability, but no consistent pattern could be established.