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Catecholamine concentrations of fetal blood and amniotic fluid during labor.

Catecholamine concentrations in the amniotic fluid and in the umbilical arterial plasma obtained from 52 full term deliveries were determined by radioenzymatic assay. Umbilical arterial blood pH and PO2 were also measured. There were significant correlations between umbilical arterial plasma catecholamine concentrations and pH and PO2. Significant correlations were also observed for fetal blood pH and PO2 versus amniotic fluid norepinephrine levels (pH: r = - 0.340, n = 52, p<0.05 PO2: r= -0.351, n = 52, p<0.05) but not epinephrine levels. Moreover, there were significant positive correlations between the catecholamine concentrations in the umbilical arterial plasma and in the amniotic fluid (norepinephrine: r = 0.372, n = 52, p<0.05 epinephrine: r = 0.359, n = 52, p<0.05). These results indicate that amniotic fluid catecholamine concentrations, especially norepinephrine, reflect fetal sympathoadrenal activity which responds to acidosis and hypoxia. Amniotic fluid catecholamine levels are an indicator of fetal condition and fetal stress during labor.