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Introduction: Double outlet left ventricle (DOLV) is a rare congenital heart anomaly, and cases of DOLV with an intact ventricular septum are uncommon. To date, only four such cases have been reported in the medical literature. Case Presentation: This report presents a case of prenatally diagnosed DOLV. A fetal echocardiogram at 21 weeks of gestation demonstrated both great arteries, aorta and pulmonary artery, arising from the left ventricle with severely dysplastic tricuspid valve and severe hypoplasia of the right ventricle. Subsequent echocardiograms demonstrated no ventricular septal defect. The patient required balloon atrial septostomy in the first week of life, underwent pulmonary artery banding at 5 weeks of life, and is currently status post-bidirectional Glenn, and is awaiting final Fontan palliation. Conclusion: Prenatal diagnosis aided in predicting and guiding postnatal management. [ABSTRACT FROM AUTHOR]

The incidence for congenital heart block is estimated as high as 1 in 15,000 live births. Up to 90% of cases of congenital heart block, in which there is no anatomical abnormalities, are attributed to maternal systemic lupus erythematous or Sjögren's disease. 50% of these mothers are asymptomatic at time of diagnosis. The post-natal cardiac manifestations have been felt to be irreversible. In this article we present, to our knowledge, the first case of spontaneous conversion of immune mediate 3 rd degree heart block to sinus rhythm postnatally.