Relationship of parameters of left ventricular dyssynchrony andheart failure Parameters HF (n = 88) (X ± SD) WithoutHF (n = 18) (X ± SD) p PSD 76.3 ± 15.95 43.8 ± 15.64 <0.05 HBW 241.5 ± 66.43 139.6 ± 61.49 <0.05 HK 36.4 ± 18.66 27.4 ± 21.06 <0.05 HS 4.91 ± 1.37 4.1 ± 1.45 <0.05 Peak 155.3 ± 46.22 137.7 ± 29.8 >0.05 LVD 88 (100%) 13 (72.22%) <0.05 The indices of evaluating left ventricular dyssynchrony (LVD) on Gated-SPECT such as PSD, HBW, HS, and HK in the group of patients with heart failure had higher average values than those in the group of patients without clinical heart failure.