Article ID Journal Published Year Pages File Type
2969209 Journal of Electrocardiology 2009 6 Pages PDF
Abstract

In the present study, we have retrospectively analyzed the corrected QT (QTc) interval before spontaneous episodes of sudden cardiac arrest in patients with a wearable cardioverter defibrillator. Corrected QT interval was measured for all normal beats from 32 recordings of baseline rhythm and compared to normal rhythm before a paired spontaneous cardiac arrhythmia. Before arrhythmia, the QTc (505 ± 73 ms) was not significantly longer than the baseline rhythm (497 ± 73 ms) (P = .23). Considering ventricular tachycardia (VT) events only (12 patients), event QTc (526 ± 75 ms) was not significantly longer than baseline QTc (520 ± 74 ms) (P = .41). Considering fast VT/ventricular fibrillation (VF) events only (20 patients), event QTc (494 ± 70 ms) was not significantly longer than baseline QTc (483 ± 71 ms) (P = .26). The influence of QTc as a measure to indicate an impending VT event in a variety of VT/VF patients remains unclear.

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