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Site of catecholamine modulation of feto‐maternal electric potential difference in the pig

Feto‐maternal vascular (PD(F‐M)) and amniotic maternal (PD(A‐M)) potential differences were measured simultaneously on seven occasions in six conscious pigs of 100–106 days gestation. Resting values of PD(F‐M) and PD(A‐M) were not significantly different although the range was wide. Fetal intravascular injection of 20 microg adrenaline, but not of saline, was associated with a prompt reversible change, of equal magnitude, in both PD(F‐M) and PD(A‐M). In some experiments polarity was reversed. Feto‐amniotic potential difference did not change. There was no change in fetal plasma K+ and Na+ concentrations. Because of the simultaneous and equal alterations in PD(F‐M) and PD(A‐M) following adrenaline and the anatomical configuration of the pig conceptus, we conclude that the catecholamine modifiable component of PD(F‐M) is generated by electrogenesis in the pig placenta, probably by its chorionic (trophoblastic) cell layer.