Hydrops fetalis is defined by the accumulation of fluids in the serous membranes (pleurisy, ascites, pericarditis...), it is a rare condition; its etiologies are divided into immunological and non-immunological. Supraventricular tachycardia remains a known cause, non-immunological, but difficult to manage.
In this article we report the case of a newborn with hydrops fetalis secondary to supraventricular tachycardia, which failed to be treated.
The clinical, paraclinical, etiological diagnosis and finally the treatment were discussed.