Why the study?
The exact nature of the circuit and the existence of the upper and lower common pathways in AVNRT are not well defined.
Atypical AVNRT can present with spontaneous intracardiac interval variability and is effectively treated with targeted slow-pathway ablation.
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Case report of atypical AVNRT variability leaves open circuit mechanisms; larger studies needed before clinical application.
Bisht et al. (2025) studied this question.
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