[Congenital long QT-interval syndrome].

: Authors report one pediatric patient with prolonged QT-interval syndrome. Importance of this syndrome is based on the possibility of syncopal episodes, due to serious arrhythmias, and sudden death. Therapeutics protocols and prophylactic treatment's indications. They are reviewed conclude that familial study is necessary in congenital type and that better therapeutical results are achieved with propranolol than with others drugs.