Table 2

Quantitative myocardial contrast echocardiographic perfusion parameters at the segmental level†

ParameterNormal perfusion by SPECT (845 segments)Abnormal perfusion by SPECT (130 segments)p Value
BaselineStressp Value*BaselineStressp Value*Baseline‡Stress§
rBV (ml/ml)0.26 (0.11)0.40 (0.18)<0.0010.29 (0.24)0.32 (0.11)0.3000.198<0.001
β (min−1)7.24 (3.51)14.55 (7.67)<0.0014.02 (1.75)3.85 (3.65)0.599<0.001<0.001
MBF (ml/min/g)1.81 (1.14)5.61 (3.56)<0.0011.14 (1.13)1.21 (1.42)0.685<0.001<0.001
  • †Continuous variables are presented as mean (SD).

  • *p Values are for comparisons within the same group at baseline and stress.

  • ‡p Values are for comparisons between baseline parameters for segments with abnormal perfusion versus segments with normal perfusion.

  • §p Values are for comparisons between stress parameters for segments with abnormal perfusion versus segments with normal perfusion.

  • β, myocardial blood flow velocity; MBF, myocardial blood flow; rBV, relative myocardial blood volume; SPECT, single-photon emission computed tomography.