The boundaries for pre-implant LVEF were < 22 % ( n = 128 ; 18.2 + / - 3.1 % ; T ( low ) ) , 22 % to 28 % ( n = 121 ; 25.4 + / - 1.4 % ; T ( middle ) ) and > 28 % ( n = 117 ; 32.6 + / - 3.9 % ; T ( high ) ) for each tertile.Two-year post-implant LVEF was 32.0 + / - 11.5 % ( T ( low ) ) , 33.7 + / - 10.8 % ( T ( middle ) ) and 36.4 + / - 9.9 % ( T ( high ) ) .