Perinatal atrial flutter: different therapeutic outcomes in two case reports.

Atrial flutter is a rare but potentially lethal arrhythmia, characterized by a rapid regular atrial rate, accompanied by variable degrees of atrioventricular block. Two cases of neonatal atrial flutter are described. The first case was diagnosed in utero at 38 weeks of gestation and converted to sinus rhythm by electric shock on the eighth day of life.