SyncopeSyncope, VasovagalMiddle AgedEar, MiddleAge FactorsRisk FactorsHungaryProspective StudiesFollow-Up StudiesAgingBradycardiaSmokingSocial ConditionsCoronary DiseaseCohort StudiesBlood PressureMidodrineSwedenElectrocardiographyMiddle Cerebral ArteryFinlandAge DistributionMortalityCause of DeathGreat BritainCross-Sectional StudiesPacemaker, ArtificialAlcohol DrinkingExerciseRecurrencePostureBody Mass IndexElectrocardiography, AmbulatoryPrevalenceSocioeconomic FactorsSex FactorsSocial ClassSex DistributionInfarction, Middle Cerebral ArteryBody ConstitutionCardiovascular DiseasesTime FactorsCerebrovascular DisordersRegression AnalysisRiskLongitudinal StudiesRetrospective StudiesQuestionnairesCarotid SinusNorwayLife StylePhysical FitnessScotlandFludrocortisoneUnconsciousnessHeart BlockCardiac Pacing, ArtificialCase-Control StudiesCholesterolMultivariate AnalysisArrhythmias, CardiacLogistic ModelsEnglandHeart RateForced Expiratory VolumeEducational StatusLong QT SyndromeAutonomic DenervationDeath, Sudden, CardiacDefibrillators, ImplantableBody CompositionIncidenceTachycardia, VentricularProportional Hazards ModelsDizzinessSick Sinus SyndromeEtilefrineSupine PositionOdds RatioBody WeightOrthostatic IntoleranceObesityHeart ArrestHead-Down TiltDietReflex, AbnormalAtrioventricular BlockAutonomic Nervous SystemElectrophysiologic Techniques, CardiacTachycardiaTreatment OutcomeMyocardial InfarctionAdrenergic beta-Antagonists