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Changes in fetal supraventricular extrasystoles during uterine contractions in labour

The electrocardiogram and phonocardiogram were recorded from a fetus exhibiting supraventricular ectopic beats during labour. The ectopic beats showed increased amplitude of the first heart sound (S1) compared to sinus and postectopic beats; the R–S1 interval was prolonged and the mechanical systole, measured as the S1–S2 interval, shortened. During uterine contractions these parameters were measured every 10 sec. The S1 amplitude of the ectopic beats decreased; simultaneously the R–S1 interval increased and the S1–S1 interval shortened. The changes were delayed compared to the amniotic pressure curve. The changes found can be explained by a shift of blood between the fetus and placenta, caused by uterine contraction.