Fetal supraventricular tachycardia diagnosed and treated at twenty-four weeks of gestation and after birth: a case report.

Arrhythmias, supraventricular; Digoxin; Fetal echocardiography; Flecainide; Sotalol. Supraventricular tachycardia is the most common clinically significant fetal tachycardia. The di- agnosis is usually made at routine sonographic workup during the second-third trimester of preg- nancy. Treatment goals are cardioversion to sinus rhythm and reversal of cardiac dysfunction. We de- scribe a case of fetal supraventricular tachycardia diagnosed at 24 weeks of gestation. The first-line treatment was oral maternal digoxin and sotalol. This therapy was not sufficient for complete control of the tachycardia. Hence, second-line treatment with digoxin and flecainide was started and suc- cessfully achieved conversion to sinus rhythm. No adverse maternal side effects were noted during the 14 weeks of therapy. A normal male infant was delivered at elective cesarean section performed for obstetric indications at 38 weeks of gestation. A persistent junctional reciprocating tachycardia with a ventriculo-atrial/atrioventricular ratio > 1 was diagnosed following delivery at transesophageal electrophysiological study. At the age of 8 months the child is on therapy with sotalol (4 mg/kg/day) and flecainide (3 mg/kg/day) and is in good clinical conditions.