Relationship of LVD parameters on Gated-SPECT and TSI ultrasound Gated SPECT Ultrasound Total Positive Negative Positive 64 18 82 Negative 1 23 24 Total 65 41 106 Compatibility Po = 0.82 k = 0.59 p < 0.05 Pe = 0.56 The observed compatibility for diagnosing left ventricular dyssynchrony assessed by Gated-SPECT and Tissue Doppler ultrasound was 87/106 (82.1%); Kappa coefficient equals to 0.59 with p <0.05.