Neurally mediated syncope: |
Absence of heart disease |
Long history of recurrent syncope |
After sudden unexpected unpleasant sight, sound, smell, or pain |
Prolonged standing or crowded, hot places |
Nausea, vomiting associated with syncope |
During a meal or postprandial |
With head rotation or pressure on carotid sinus (as in tumors, shaving, tight collars) |
After exertion |
Syncope due to OH: |
After standing up |
Temporal relationship with start or changes of dose of vasodepressive drugs leading to hypotension |
Prolonged standing, especially in crowded, hot places |
Presence of autonomic neuropathy or Parkinsonism |
Standing after exertion |
Cardiovascular syncope: |
Presence of definite structural heart disease |
Family history of unexplained sudden death or channelopathy |
During exertion or supine |
Abnormal ECG |
Sudden onset palpitation immediately followed by syncope |
ECG findings suggesting arrhythmic syncope: |
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