Abstract
In a study of 13 postmortem specimens from infants with intermediate and complete forms of persisting atrioventricular (AV) canal, potentially obstructive left ventricular outflow tract morphology was apparent in 6. Possible obstructive components included various causes of anterior mitral leaflet immobility, multiple short chordae, anterior malposition of papillary muscles, and septal hypertrophy. Left ventricular outflow tract obstruction can be exaggerated by corrective techniques that do not produce relief of these conditions.
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