BaroreflexPeroneal NerveSympathetic Nervous SystemPhenylephrineHeart RateBlood PressureNitroprussidePressoreceptorsAutonomic Nervous SystemSensitivity and SpecificityValsalva ManeuverVagus NerveReflexTilt-Table TestCardiovascular SystemBradycardiaSupine PositionVasoconstrictor AgentsCarotid SinusAutonomic Nervous System DiseasesReflex, AbnormalHeartTachycardiaParasympathetic Nervous SystemElectrocardiographyHead-Down TiltDizzinessSolitary NucleusHypertensionSignal Processing, Computer-AssistedHemodynamicsConsciousnessPulseTelemetryPostureCardiovascular Physiological PhenomenaPhotoplethysmographyCarotid ArteriesSyncope, VasovagalDenervation