We herein report two cases of progressive left ventricular outflow obstruction after primary repair of arch obstruction and ventricular septal defect that was successfully resolved with Yasui conversion. Patients who require surgical reintervention for progressive left ventricular outflow tract (LVOT) obstruction after primary biventricular repair of interruption of the aortic arch or coarctation of the aorta complex are occasionally experienced. The modified Konno procedure and Ross operation are well recognized as useful for these cases. However, in some patients, these procedures are difficult to perform because of anatomic restrictions or previous procedures. Although the indications are limited, the Yasui conversion is a safe, simple, and useful option for LVOT obstruction after primary biventricular repair.
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