Key result
Atrial extra stimuli at different coupling intervals produce discordant responses during narrow QRS tachycardia.
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May complicate mechanism diagnosis in narrow QRS tachycardia; leaves open whether systematic coupling-interval testing refines EP evaluation.
Nair et al. (2019) studied this question. Atrial extra stimuli delivered at different coupling intervals produce discordant responses during narrow QRS tachycardia, highlighting complex underlying electrophysiological mechanisms.
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