No differences in mean RVEF ( 64.0 6.0 v 67.0 8.0 % , p = 0.3 ) , tricuspid annular motion ( 13.5 3.0 v 14.7 2.9 cm/s , p = 0.5 ) , or median Tei index ( 0.61 ( 0.54 , 0.88 ) v 0.59 ( 0.54 , 0.74 ) , p = 0.8 ) were observed between placebo and metoprolol , despite significantly longer cardiac time intervals .