Transplancental cardioversion of intrauterine supraventricular tachycardia with digitalis.

Intrauterine congestive heart-failure caused by a supraventricular tachyarrhythmia was diagnosed in a fetus at 29-30 weeks' gestation. Major congenital malformations were excluded by sonography, amniocentesis, and fetal abdominal paracentesis, and those of the heart by intrauterine fetal echocardiography. The mother was given digoxin and the fetal tachycardia converted to sinus rhythm.