At 6 months , the protocol reduced absolute RV pacing by a mean of 49 % ( 95 % CI 41 % to 57 % ) ( p < 0.0001 from baseline ) and resulted in a mean absolute improvement in LVEF of 6 % ( 4 % to 8 % ) ( p < 0.0001 from baseline ) but no reduction in exercise capacity , NT-pro-BNP or quality of life .