SyncopeSyncope, VasovagalUrinationUrinary BladderUrodynamicsUrination DisordersUrethraReflexBradycardiaUrinary Bladder, OveractiveEliminative Behavior, AnimalMidodrineElectrocardiographyUrinary Bladder, NeurogenicPacemaker, ArtificialCystitisUrinary RetentionElectrocardiography, AmbulatoryPostureReflex, AbnormalRecurrencePropanthelineDecerebrate StatePonsCarotid SinusUnconsciousnessHeart BlockCardiac Pacing, ArtificialFludrocortisoneUrinary Bladder DiseasesInjections, SpinalArrhythmias, CardiacPudendal NerveHypogastric PlexusAutonomic DenervationLong QT SyndromeDeath, Sudden, CardiacDefibrillators, ImplantableAutonomic Nervous SystemHeart RateTachycardia, VentricularUrinary Bladder Neck ObstructionUrinary TractSick Sinus SyndromeEtilefrineUreteroceleUrinary IncontinenceDizzinessUrinary Tract Physiological PhenomenaUrological AgentsOrthostatic IntoleranceSupine PositionUrethral ObstructionProspective StudiesHeart ArrestAtrioventricular BlockHead-Down TiltElectrophysiologic Techniques, CardiacSacrococcygeal RegionAutonomic Nervous System DiseasesTachycardiaBlood PressureCats