[Arrhythmia as the first symptom of neonatal cardiac tumors: Case report].

Background: Neonatal cardiac tumors are a rare pathology, with an approximate incidence of 0.017% in autopsies and 0.31% in obstetric echographies. The most common primary cardiac tumor is rhabdomyomas and its clinical manifestations are highly variable. Most patients do not require therapeutic management unless there is hemodynamic compromise, in which one option is surgical management, which implies high mortality. Rhabdomyomas are usually associated with tuberous sclerosis, a disease for which drugs such as everolimus or sirolimus have been used. Clinical case: Newborn male patient with no significant history, in whom a cardiac arrhythmia was detected during the routine physical examination. After the evaluation by Pediatric Cardiology, it was determined that the patient had supraventricular extrasystoles, in addition to multiple intracardiac masses that, due to imaging characteristics, were compatible with rhabdomyomas, so it was determined that the cause of cardiac arrhythmia was the presence of multiple tumors. Due to the condition of the conduction system, everolimus and propranolol were used. After 7 days, control of the arrhythmias was achieved and resolution of the tumors was achieved after 8 weeks. Conclusions: Rhabdomyomas are cardiac tumors associated with tuberous sclerosis, clinical complications can be managed effectively with everolimus as in the case presented.