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===Syncope Causes===
*'''Cardiovascular-mediated syncope'''
**[[Dysrhythmias]]:
***[[WPW]] (pre-excitation)
***[[Long QT Syndrome]]/[[QT prolongation]]
***[[Brugada Syndrome]]
***[[Catecholaminergic polymorphic ventricular tachycardia]]
***[[AV Block|2nd/3rd AV Block]]
***[[Afib]]/aflutter
***[[Vtach]]/[[torsades]]
***[[Sick sinus syndrome]]
***[[Arrhythmogenic right ventricular dysplasia]]
***[[Short QT]] syndrome
**Cardiovascular disease
***[[Valvular emergencies|Valvular Disease]] (AS, MS, tricuspid stenosis)
***[[Aortic Dissection]]
***[[Myocardial Infarction]]
***[[CHF]]
***[[Hypertrophic Cardiomyopathy]]
***[[PE]]
***[[Pericardial Tamponade]]
***[[Myxoma]]
***[[Pulmonary Hypertension]]
***[[Pacemaker malfunction]]
*'''Neurally mediated syncope'''
**Vasovagal:
***Fear, pain, emotion, valsalva, [[breath-holding spell]]
**Situational (associated with):
***[[Cough]]ing, micturition, defecation, [[vomiting]], swallowing, postexercise
***Carotid sinus stimulation
*'''Orthostatic hypotension-mediated syncope:'''
**Volume depletion:
***[[Dehydration]] ([[vomiting]], [[diarrhea]])
***[[Hemorrhage]], ([[Ectopic Pregnancy]], [[Upper GI Bleed]]/[[Lower GI Bleeding]], [[Abdominal aortic aneurysm|Abdominal Aortic Aneurysm]])
***[[Sepsis]]
**[[Autonomic Dysreflexia]]
**Autonomic failure due to meds
*'''Other serious causes'''
**[[Stroke]]
**[[SAH]]
**[[TIA]]
**[[Vertebrobasilar insufficiency|Vertebrobasilar Insufficiency]]
**[[Subclavian steal]]
**[[Heat syncope]]
**[[Hypoglycemia]]
**Hyperventilation
**Asphyxiation
**[[Seizure]]
**Narcolepsy
**Psychogenic ([[anxiety]], [[conversion disorder]], [[somatic symptom disorder]])
**Toxic (drugs, [[carbon monoxide]], etc.)