Fig. 4

Closure of the free wall defect. a The “tail” of the secondary patch (asterisk) was folded over in the left ventricle and stitched from the inside to the outside with 2/0 braided sutures (④ in Fig. 1b). b An external patch of Dacron fabric with a width of 30 mm snugged down to close the ventriculotomy defect. The width of the patch should be slightly smaller than that of the stitched area to reduce tension of the internal patch