Unusual resetting of superior-type fast-slow atrioventricular nodal reentrant tachycardia with cycle length alternans by early spontaneous premature ventricular contraction.

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The pacing maneuvers for supraventricular tachycardia with cycle length alternans are sometimes difficult, especially when diagnostic ventricular pacing does not conduct to the atrium. Even in such a situation, critical diagnostic findings can be obtained by spontaneous premature ventricular contraction.