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Objectives In this study of patients with Chagas heart disease (CHD) with an implantable cardioverter defibrillator (ICD) for secondary prevention of sudden cardiac death, we sought to compare the characteristics of those with or without electrical storm (ES) during long-term follow-up. Background ES is a common problem in patients with CHD harboring an ICD, but data on clinical predictors and outcomes are limited. Methods We retrospectively evaluated 110 patients with CHD with a mean follow-up of 1949 ± 1271 days. Demographic, clinical, arrhythmia characteristics, ICD treatment, and death data were collected. Descriptive statistics included mean ± SD and Fisher exact tests used for comparisons. A p-value Results The ES group (57 patients; 43 men; 62 ± 10 years) and the non-ES group (53 patients; 43 men; 57 ± 14 years) had similar baseline demographic and clinical parameters, but left ventricular ejection fraction was higher in the ES group (44% ± 14% vs. 37% ± 14%, p = 0.02) and QRS duration was shorter (109 ± 35 ms vs. 134 ± 36 ms; p = 0.0027). Mortality rates were comparable in the 2 groups (odds ratio: 1.2; 95% confidence interval: 0.79 to 1.85; p = 0.44). The ES group presented 116 ES (2.03 ±1.47, 1 to 6). A total of 2,953 (61%) arrhythmic events required ICD therapy. No deaths occurred directly caused by ES, but clinical triggers were reported in 20 patients. Conclusions ES is frequent in CHD but in itself does not carry a worse prognosis in this study population and was not associated with a more depressed left ventricular systolic function or a longer QRS.