Ventricular tachycardia (VT) is a rare cause of tachycardia during the fetal life. Coexistence of VT with sinus bradycardia or second-degree heart block strongly suggests long QT syndrome (LQTS) [1Hofbeck M., Ulmer H., Beinder E., Sieber E., Singer H. Prenatal findings in patients with prolonged QT interval in the neonatal period Heart 1997 ;  77 : 198-20410.1136/hrt.77.3.198 [cross-ref]

Cliquez ici pour aller à la section Références, 2Miyake A., Sakaguchi H., Miyazaki A., Miyoshi T., Aiba T., Shiraishi I. Successful prenatal management of ventricular tachycardia and second-degree atrioventricular block in fetal long QT syndrome HeartRhythm Case Rep 2017 ;  3 : 53-5710.1016/j.hrcr.2016.09.001 [cross-ref]

Cliquez ici pour aller à la section Références, 3Chabaneix J., Andelfinger G., Fournier A., Fouron J.C., Raboisson M.J. Prenatal diagnosis of long QT syndrome with the superior vena cava- aorta Doppler approach Am J Obst Gynecol 2012 ;  207 : e3-710.1016/j.ajog.2012.06.058

Cliquez ici pour aller à la section Références] and needs to administrate to the mother beta-blockers and in some cases magnesium sulfate [1Hofbeck M., Ulmer H., Beinder E., Sieber E., Singer H. Prenatal findings in patients with prolonged QT interval in the neonatal period Heart 1997 ;  77 : 198-20410.1136/hrt.77.3.198 [cross-ref]

Cliquez ici pour aller à la section Références,2Miyake A., Sakaguchi H., Miyazaki A., Miyoshi T., Aiba T., Shiraishi I. Successful prenatal management of ventricular tachycardia and second-degree atrioventricular block in fetal long QT syndrome HeartRhythm Case Rep 2017 ;  3 : 53-5710.1016/j.hrcr.2016.09.001 [cross-ref]

Cliquez ici pour aller à la section Références,4Simpson J.M., Maxwell D., Rosenthal E., Gill H. Fetal ventricular tachycardia secondary to long QT syndrome treated with intravenous magnesium: case report and review of the literature Ultrasound Obstet Gynecol 2009 ;  34 : 475-48010.1002/uog.6433 [cross-ref]

Cliquez ici pour aller à la section Références]. When there is no argument for a LQTS several drugs have been proposed, most of them contraindicated in LQTS. We present a case of fetal LQTS with fetal VT and cardiac insufficiency with no antenatal clue for LQTS, successfully managed with propranolol. Thus, we suggest that in case of isolated fetal VT (i.e. without tumor or cardiomyopathy) beta blockers (excluding sotalol) should be the first line treatment since LQTS can be a possible cause for the dysrhythmia.