Supplementary oxygen is routinely administered to patients, even those with adequate oxygen saturations, in the belief that it increases oxygen delivery. However, oxygen delivery depends not just on arterial oxygen content but also on perfusion. Maternal oxygen administration has been used in an attempt to lessen fetal distress by increasing the available oxygen from the mother. However, the effect of supplemental maternal oxygen therapy on fetal acid base status has been debated for more than seven decades. The investigators found the use of 2 L/min maternal oxygen during the second stage of labor did not adversely affect either the umbilical artery pH value or the fetal heart rate (FHR) pattern distribution.
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Cord arterial pH values
Timeframe: within 30 to 60 seconds of birth
Cord arterial partial pressure of oxygen
Timeframe: within 30 to 60 seconds of birth
Cord arterial partial pressure of carbon dioxide
Timeframe: within 30 to 60 seconds of birth
Cord venous pH values
Timeframe: within 30 to 60 seconds of birth
Cord venous partial pressure of oxygen
Timeframe: within 30 to 60 seconds of birth
Cord venous partial pressure of carbon dioxide
Timeframe: within 30 to 60 seconds of birth