When CRT was turned on initially , immediate changes occurred in LV volumes and ejection fraction ; however , these changes did not correlate with the long-term changes ( 12 months ) in LV end-systolic ( r = 0.11 , P = 0.31 ) or end-diastolic ( r = 0.10 , P = 0.38 ) volume indexes or LV ejection fraction ( r = 0.07 , P = 0.72 ) .
