In atrioventricular septal defect (AVSD), anatomical
lesions usually are an ostium primum atrio-septal defect; a common
atrioventricular valve, an inlet ventricular septal defect (VSD). It is most
often associated with major chromosomal abnormalities. It is the most common
congenital disease in Down syndrome. Our case was an infant with a Down
syndrome who was admitted for a dyspnea (stage 3 in New York Heart Association classification)
and tachycardia. The diagnosis was made by a transthoracic echocardiography. It
showed a rare variety of atrioventricular septal defect without an atrial
septal defect. The child was treated successfully with one patch technic and no
recurrence was noted.
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