Fetal atrial flutter in the setting of immune-mediated complete atrioventricular block: A unique combination of fetal arrhythmias

ABSTRACT

Fetal exposure to maternal anti-Ro/SSA antibodies can result in several cardiac disorders, most commonly atrioventricular block (AVB). Immune-mediated complete AVB is typically an irreversible complication of maternal anti-Ro antibodies and could result in intrauterine fetal demise. Atrial arrhythmias are rarely reported in patients with maternal anti-Ro/SSA autoantibodies. This report presents a rare combination of fetal arrhythmias, with transient episodes of fetal atrial flutter superimposed on a complete AVB rhythm. No antiarrhythmic medication was required. However, the adverse outcome associated with advanced AVB was unavoidable.