Non-Cardiogenic Etiologies of Syncope
Physiological Reflex Syncope (vasovagal)
Most common type of syncope (50-80%)1
Biphasic
- Initial phase: apprehension, anxiety, increased HR
- Vasodepressor phase: decreased HR, BP, CO ® faint
Prompt resolution when supine (self-limiting)
Accommodation usually occurs (60-85% have only 1 episode)2
Many other types, but represent a small percentage of syncope
1Wayne, HH Am Journal Med. v30: p. 418-438. 1961
2Kapoor WN. Am Journal Med. V83: p.700-708. 1987