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A bout 15 years ago, Waldo and associates' first described that a tachycardia could be transiently accelerated to a faster rate by overdrive pacing without fundamentally altering the underlying tachycardia, a phenomenon they called transient entrainment. That first description of transient entrainment applied to atrial flutter but was soon extended to ectopic atrial tachycardias,2 atrioventricular reentrant tachycardia,3 and ventricular tachycardia.4 Three basic criteria of transient entrainment were recognized: 1)

Transient entrainment of tachycardias.