Abstract
The present study was aimed at determining the effect of maternal inhalation of 10, 50, and 100 per cent oxygen upon fetal blood PO2 and acid-base status during labor. As maternal capillary blood PO2 increases or decreases, fetal scalp capillary blood PO2 changes in the same manner. In both normal and abnormal patients inhalation of oxygen enriched mixtures increased fetal blood PO2. The most effective way of increasing fetal blood PO2 was by administering 100 per cent oxygen by mask. The increase in fetal blood PO2 was usually rapid. Fetal base deficit sometimes increased during the experiments. This change was associated with a decrease of fetal capillary blood PCO2. The present study was aimed at determining the effect of maternal inhalation of 10, 50, and 100 per cent oxygen upon fetal blood PO2 and acid-base status during labor. As maternal capillary blood PO2 increases or decreases, fetal scalp capillary blood PO2 changes in the same manner. In both normal and abnormal patients inhalation of oxygen enriched mixtures increased fetal blood PO2. The most effective way of increasing fetal blood PO2 was by administering 100 per cent oxygen by mask. The increase in fetal blood PO2 was usually rapid. Fetal base deficit sometimes increased during the experiments. This change was associated with a decrease of fetal capillary blood PCO2.
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