CONTINUOUS FETAL SCALP AND CAROTID-ARTERY OXYGEN-TENSION MONITORING IN SHEEP

  • 1 January 1976
    • journal article
    • research article
    • Vol. 47  (5) , 587-592
Abstract
Fetal scalp and carotid O2 tension (PO2) were recorded continuously by polarographic O2 electrodes at several levels of maternal oxygenation. The results were compared to measurements obtained by intermittent blood samples using the radiometer blood gas analyzer. There was a good correlation between the PO2 values measured by the implanted O2 electrodes and by conventional analyses of blood samples collected anaerobically. Electrode measurements differed from the control radiometer values of by a mean of .+-. 1.2 mm Hg; 2 SD .+-. 2.50. Scalp PO2 recordings were lower but paralleled the carotid recordings under varying degrees of maternally inspired O2 concentrations. Scalp PO2 levels reflect closely those in the central fetal circulation. Administration of 95% O2 to the mother resulted in a 27% increase of scalp PO2 and a 29% increase in the carotid artery PO2 when compared to room air.

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