Syncope - Differential Diagnosis
The percentage of syncopal events secondary to arrhythmias or structural disease is generally less than 25%.
Neurally-mediated 66%
• Vasovagal
• Carotid sinus
• Situational
- Cough
- Micturition
- Defaecation
- Swallow
- Others
Orthostatic hypotension (10%)
• Drug induced
• ANS failure (primary, secondary)
• Volume depletion
Cardiac arrhythmia - 11%
• Brady (Sick sinus, AV block)
• Tachy (VT, SVT)
• Inherited
Structural cardiopulmonary
• Aortic stenosis
• HOCM
• Pulmonary hypertension
• Others
Non-syncopal - 6%
• Metabolic
• Epilepsy
• Intoxications
• Drop-attacks
• Psychogenic
• TIA
• Falls
Unknown - 2%
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