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The n-3 polyunsaturated fatty acids (PUFAs), including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), have antiarrhythmic effects, possibly via modulation of the cardiac ion channels. Nevertheless, it is unknown whether low serum levels of n-3 PUFAs are risk factors for ventricular fibrillation in patients with Brugada syndrome (BrS). We retrospectively reviewed data from 62 men with BrS and evaluated their serum levels of EPA and DHA, and the risk factors for sudden cardiac death, including a history of cardiogenic syncope. Nineteen patients had a history of cardiogenic syncope, and their EPA and DHA levels were significantly lower than those of the patients without syncope. Multivariate logistic regression analysis revealed that low EPA and DHA levels were associated with the incidence of syncope. The receiver-operator characteristic curve showed the area under the curves of EPA and DHA for history of syncope were 0.84 and 0.72, respectively. In conclusion, low levels of EPA and DHA are risk factors for cardiogenic syncope in patients with BrS, which suggests that n-3 PUFAs play important roles in preventing ventricular fibrillation in BrS.

Low Serum Levels of Eicosapentaenoic Acid and Docosahexaenoic Acid are Risk Factors for Cardiogenic Syncope in Patients with Brugada Syndrome