• Heart Rhythm · Oct 2017

    Comparative Study

    Long-term prognosis of drug-induced Brugada syndrome.

    • Juan Sieira, Giuseppe Ciconte, Giulio Conte, Carlo de Asmundis, Gian-Battista Chierchia, Giannis Baltogiannis, Giacomo Di Giovanni, Yukio Saitoh, Ruben Casado-Arroyo, Justo Juliá, Mark La Meir, Francis Wellens, Kristel Wauters, Gudrun Pappaert, and Pedro Brugada.
    • Heart Rhythm Management Centre, Universitair Ziekenhuis Brussel, Postgraduate program in Cardiac Electrophysiology and Pacing, Vrije Universiteit Brussel, Brussels, Belgium. Electronic address: jasieira@gmail.com.
    • Heart Rhythm. 2017 Oct 1; 14 (10): 1427-1433.

    BackgroundPatients with drug-induced Brugada syndrome (BS) are considered at a lower risk than those with a spontaneous type I pattern. Nevertheless, they can present arrhythmic events.ObjectiveThe purpose of this study was to investigate their clinical characteristics, long-term prognosis and risk factors.MethodsA consecutive cohort of 343 patients with drug-induced BS was included and compared with 78 patients with a spontaneous type I pattern.ResultsThe mean age was 40.7 ± 18.3 years. Sudden cardiac death (SCD) was the clinical presentation in 13 (3.8%) and syncope in 86 (25.1%); 244 (71.1%) were asymptomatic. Patients with drug-induced BS were less frequently men (180 (52.5%) vs 63 (80.8%); P < .01), were more frequently asymptomatic (244 (71.1%) vs 44 (56.4%); P < .01), and had less ventricular arrhythmias (VAs) induced during electrophysiology study (41 (13.2%) vs 31 (42.4%); P < .01). An implantable cardioverter-defibrillator was implanted in 128 patients (37.3%). During a median follow-up of 62.5 months (interquartile range 28.9-115.6 months), 34 patients presented arrhythmic events. The event rate was 1.1% person-year (vs 2.3% person-year in patients with a spontaneous type I pattern; P < .01). Presentation as SCD and inducible VAs were independent risk factors significantly associated with arrhythmic events (adjusted hazard ratio 22.0 and 3.5). Drug-induced BS was related to a better prognosis only in asymptomatic individuals.ConclusionDrug-induced BS has a good prognosis if asymptomatic; however, SCD is possible. Clinical presentation as SCD and inducible VAs during electrophysiology study are independent risk factors for arrhythmic events. In asymptomatic patients, proband status and inducible VAs can help to identify patients at higher risk, but further evidence is needed.Copyright © 2017 Heart Rhythm Society. Published by Elsevier Inc. All rights reserved.

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