The RV cardiomyocyte diameter and collagen volume fraction ( CVF ) correlated with the preoperative GLS , GLSRs and GLSRe , respectively , in the younger patients ( r1 = -0.566 , P1 = 0.018 ; r2 = -0.493 , P2 = 0.004 ; r3 = -0.504 , P3 = 0.039 ) .