Abstract
Objective The purpose of this study was to determine the incidence and risk factors of electrical storms (ES)in patients who received implantable cardioverter defibrillator(ICD). Methods We retrospectively assessed 134 ICD patients' medical records and ICD programmed records.ES was defined as the occurrence of three or more ventricular tachyarrhythmia episodes that needs ICD therapy. Results seventeen point four percent of the patients experienced at least one ES episode.In most ES cases, the index arrhythmia was ventricular tachycardia.Compared with non-ES patients, ES patients had depressed left ventricular ejection fraction(LVEF 0.48±0.13 vs.0.40±0.09, P=0.04), enlarged left ventricular diameter[(56.2±9.5)mm vs.(60.8±7.9)mm, P=0.03], insufficient use of β-blocker(91.8% vs.71.8%, P=0.01). And ES episode could increase the risk of combined incidence of mortality and heart transplantation. Conclusion ES events are not rare in a ' real-world' patient population with ICDs.It is most likely to occur in patients with lower LVEF, and insufficient use of β-blocker would increase the risk of ES. Key words: Implantable cardioverter defibrillation; Electrical storm; Ventricular tachyarrhythmia
Published Version
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