(A) Comparison of degree of CAVVR in the early postoperative period in patients who underwent bivalvation versus repair without bivalvation. (B) Comparison of post-repair CAVV orifice area in patients with no-to-mild CAVVR versus those with greater than mild-to-moderate CAVVR in the postoperative period. (B) Red circles represent patients who underwent bivalvation; blue circles represent patients who underwent repair without bivalvation. The red line represents 136% of normal MV area as the upper limit that resulted in acceptable CAVVR in patients who underwent non-bivalvation, and the blue line represents 96% of normal MV area as the lower limit. CAVV: common atrioventricular valve; MV: mitral valve; CAVVR: common atrioventricular valve regurgitation.