Brugada SyndromeRisk AssessmentPrognosisPredictive Value of TestsRisk FactorsDeath, Sudden, CardiacElectrocardiographyTroponin TProspective StudiesMyocardial InfarctionBiological MarkersBaroreflexROC CurveFollow-Up StudiesChest PainSurvival AnalysisNatriuretic Peptide, BrainProportional Hazards ModelsRetrospective StudiesTreatment OutcomeKaplan-Meier EstimateMultivariate Analysis