In patients , global area strain correlated inversely with SDI ( r = -0.42 , P = .04 ) , RV end-diastolic volume ( r = -0.48 , P = .032 ) , and RV end-systolic volume ( r = -0.48 , P = .031 ) and positively with EF ( r = -0.51 , P = .02 ) , while RV SDI correlated positively with RV end-systolic volume ( r = 0.55 , P = .012 ) , pulmonary regurgitation fraction ( r = 0.54 , P = .031 ) , and QRS duration ( r = 0.51 , P = .022 ) and negatively with RV EF ( r = -0.62 , P = .004 ) .