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Syncope causes, by system

Emergency/CV
HEAD HEART VESSELS:

CNS causes include HEAD:
Hypoxia/ Hypoglycemia
Epilepsy
Anxiety
Dysfunctional brain stem (basivertebral TIA)

Cardiac causes are HEART:
Heart attack
Embolism (PE)
Aortic obstruction (IHSS, AS or myxoma)
Rhythm disturbance, ventricular
Tachycardia

Vascular causes are VESSELS:
Vasovagal
Ectopic (reminds one of hypovolemia)
Situational
Subclavian steal
ENT (glossopharyngeal neuralgia)
Low systemic vascular resistance (Addison's, diabetic vascular neuropathy)
Sensitive carotid sinus
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