Résumé : This European study on maternal and fetal management of fetal supraventricular tachyarrhythmia (FSVT) was designed to achieve the following goals: to estimate the efficacy of transplacental digoxin administered intravenously to the mother in sustained FSVT, with or without cardiac failure, and intermittent FSVT without cardiac failure; and to evaluate the natural history of intermittent FSVT without cardiac failure. Doppler fetal echocardiography was utilized for diagnosis and sequential evaluation of FSVT and for the assessment of fetal hemodynamics. To obstetricians and pediatric cardiologists involved in prenatal cardiology, we propose a rational treatment and management regimen for FSVT. Our hope is to obtain a controlled study on a large number of fetuses on an international scale and thus provide a uniform maternal and fetal therapeutic strategy for FSVT.