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Table 3 Derivation cohort—perfusion defect severity and dyssynchrony

From: Phase analysis single-photon emission computed tomography (SPECT) myocardial perfusion imaging (MPI) detects dyssynchrony in myocardial scar and increases specificity of MPI

Variable Mild (1–4)a (N = 66) Moderate (5–8)b (N = 18) Severe (8+)c (N = 21) p value
Entropy (%) 48.5 (43.0, 56.0) 55.5 (47.0, 71.0) 62.0 (55.0, 69.0) < .001
Phase histogram bandwidth (°) 48.0 (36.0, 72.0) 75.0 (42.0, 138.0) 96.0 (72.0, 138.0) < .001
Phase standard deviation (°) 12.7 (9.9, 22.0) 19.7 (11.2, 37.6) 23.5 (17.8, 27.8) 0.002
  1. Continuous variables expressed as median (interquartile range)
  2. aMild scar defined as summed rest score of 1–4
  3. bModerate scar defined as summed rest score of 5–8
  4. cSevere scar defined as summed rest score > 8