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Is syncope related to moderate altitude exposure?
R Nicholas1, P D O'Meara, N Calonge
1Colorado Altitude Research Institute, Snake River Health Services, Keystone 80435.
Sudden fainting (syncope) in young adults may be linked to rapid ascent to moderate altitudes. Low arterial oxygen saturation is associated with this high-altitude syncope, warranting further investigation.
Area of Science:
- Environmental Medicine
- Cardiology
- Altitude Physiology
Background:
- Syncope, or fainting, can occur in otherwise healthy individuals.
- Ascent to moderate altitudes presents physiological challenges.
Purpose of the Study:
- To identify factors associated with syncope in individuals recently arriving at moderate altitude.
- To investigate the relationship between syncope and physiological markers at altitude.
Main Methods:
- A retrospective case-control study was conducted over 1 year.
- Patients diagnosed with syncope or near-syncope were reviewed.
- A control group of local acclimatized residents was used for comparison.
Main Results:
- Syncope of unknown origin showed a significant association with arrival at altitude within 24 hours.
- Lower arterial oxygen saturation was inversely related to syncope of unknown origin.
- The study was conducted in Summit County, Colorado (2770 m elevation).
Conclusions:
- Short-term exposure to moderate altitude may precipitate unexplained syncope in young adults.
- The term "high-altitude syncope" is proposed for this condition.
- Further research into high-altitude syncope is recommended.
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