Fig. 4.

Dispersion of repolarization quantified by APD₈₀ at the 95th percentile (APD_{95th percentile}) minus APD₈₀ at the 5th percentile (APD_{5th percentile}). Left, dispersion of repolarization at various BCL from failing (blue lines) and nonfailing (red lines) human hearts. Right, averaged dispersion of repolarization within failing and nonfailing groups for CL from 500 to 2,000 ms. It can be seen from the left that three failing hearts (nos. 1, 2, and 5) stand out from the other hearts by showing significant enhancement of dispersion of repolarization at slow heart rate and that the two failing hearts (nos. 2 and 5) had pronounced dispersion at fast heart rate as well.