Figure 2. Plot of Regional Restitution Instability Index (R2I2) against Peak Electrocardiogram Restitution Slope (PERS).
Lines are drawn at the preselected cut-off values for R2I2 and PERS. Spearman rank correlation analysis shows correlation between R2I2 and PERS in controls (r=0.71,p<0.01), but not in non-ischemic cardiomyopathy patients (r=0.20,p=0.17).