Key result
Ventricular extrastimulus during narrow QRS tachycardia unmasks its electrophysiological mechanism.
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May aid mechanism diagnosis in select EP cases; leaves open validation in larger series.
Ôta et al. (2022) studied this question. A ventricular extrastimulus delivered during a narrow QRS tachycardia produced an unusual response that was analyzed to determine its underlying electrophysiological mechanism.
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