Syncope, VasovagalTilt-Table TestSyncopeFludrocortisoneClomipramineBradycardiaHypotension, OrthostaticHead-Down TiltPostureCardiovascular AbnormalitiesMidodrineSerotonin Uptake InhibitorsAdrenergic alpha-AgonistsRecurrenceAdrenergic beta-AntagonistsHeart RateTachycardiaBlood PressureHypotensionElectrocardiography