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Comparing human ventricular action potential duration restitution curves based on the amplitude of phase 1 repolarization. Human APD90 restitution curves were separated into two groups, one showed prominent phase 1 repolarization and another one had no or small phase 1 repolarization. The data points up to 1000 ms diastolic interval were fitted by single exponential function. The inset shows the kinetical time constants for the two groups.
