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Abstract Objective To determine the prevalence and related risk factors of electrical storm recurrence in patients with implantable cardioverter- defibril ator (ICD) in our heart centre. Methods Clinical features, ventricular arrhythmia, electrical storm events and the risk factors related to electrical storm recurrence were retrospectively analyzed in patients underwent ICD implantation for primary and secondary prevention during 2004- 2013. Results A total of 231 cases (98 cases for primary prevention , 133 cases for secondary prevention) were implanted with ICD and fol owed up for 30.2 ± 23.5 months. Ventricular tachycardia/ventricular fibrillation occurred in 53 cases (22.9%). Of them, 7 cases (7.1%) was in primary prevention group, significantly lower than 46 cases (34.6%) in secondary prevention group (P<0.01). Electrical storm oc-curred in 20 cases (8.7%) with majority in secondary prevention group(19/133 cases). 12 cases(60.0%) experienced≥2 electrical storm events, of them, 10 cases (83.3%) had electrical storm recurrence within a year. Left ventricular ejection frac-tion of 30%to 40% (OR 4.861, 95%CI 1.483~15.932, P<0.01) and secondary prevention (OR 10.211, 95%CI 1.304~79.942, P<0.01) were related risk factors for electrical storm recurrence. Conclusion Electrical storm is not uncommon in ICD pa-tients and recurs mostly within one year after first attack and in patients with severe left ventricular systolic dysfunction and with an ICD implanted for secondary prevention.
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