Criss-cross heart with discordant atrioventricular connections
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A case of criss-cross heart is presented in which there was situs solitus with atrioventricular (AV) discordance and single outlet, the aorta arising from the right ventricle. Associated lesions were pulmonary atresia and ventricular septal defect.
The apparently normal AV relation in the presence of a discordant AV connection can be explained by the hypothesis that an embryonic 1-bulboventricular loop developed and was followed by marked counter-clockwise rotation of the ventricles.
Key wordsEmbryology Pulmonary atresia Atrioventricular (AV) connections Congenital heart disease
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