Why the study?
What is the electrophysiological mechanism of QRS alternans in a patient with incessant ventricular tachycardia?
Population
46-year-old patient with incessant ventricular tachycardia and QRS alternans (n=1)
Design
Case_report
Authors
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May explain QRS alternans via His-bundle conduction block in incessant VT; hypothesis-generating and requires prospective confirmation before broader application.
What is the electrophysiological mechanism of QRS alternans in a patient with incessant ventricular tachycardia?
This case report demonstrates that QRS alternans during incessant ventricular tachycardia may be caused by conduction delay or block from the tachycardia origin to the His bundle, which resolves with procainamide.
Ellenbogen et al. (1988) studied this question.
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