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In what has come to be known as Ashman's phenomenon, because the refractory period after any QRS complex is proportional to the length of the preceding R-R interval, a premature impulse is most likely to find part of the conduction system refractory if its short R-R interval has been preceded by a long R-R interval.
Temporal and spatial dispersion of repolarization during premature impulse propagation in human intact ventricular muscle: comparison between single vs.