Spontaneous resolution of atrioventricular dissociation in utero.

Fetal atrioventricular dissociation is a dysrhythmia associated with significant antenatal and postnatal morbidity and mortality. We present a case of a 19-week-old fetus with atrioventricular dissociation, which spontaneously resolved. The mother had no signs of autoimmune disease. The fetus had an uneventful gestation and, after delivery, had a normal cardiac and transesophageal electrophysiological evaluation.