Key result
Epicardial electrograms show different rate-dependent responses between J waves and notches in idiopathic ventricular fibrillation.
Why the study?
End-QRS notches or slurs, known as J waves, have been associated with sudden cardiac arrest from ventricular fibrillation in patients without structural heart disease, but their rate-dependent responses remain unclear.
Case Report (n=1)
Describes different rate-dependent responses between J waves and epicardial electrogram notches in a patient with idiopathic ventricular fibrillation.
May indicate distinct mechanisms in IVF; hypothesis-generating observation that should not yet change practice or guide ablation.
Notching or slurring on the terminal end of the QRS has been noted on standard 12-lead electrocardiograms (ECGs) with and without ST-segment elevation or T-wave alteration, which had long been considered a normal variant with benign outcomes.1-3 In recent decades, case-control studies have shown an association between such end-QRS notches or slurs and sudden cardiac arrest from ventricular fibrillation (VF) in patients without structural heart disease,4-7 and these ECG findings are called J waves.
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Kamikubo et al. (2017) conducted a case report in Idiopathic ventricular fibrillation (n=1). J waves and notches on epicardial local electrogram was evaluated on Rate-dependent responses. Different rate-dependent responses were observed between J waves and the notches on an epicardial local electrogram in a patient with idiopathic ventricular fibrillation.
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