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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: STUDY OBJECTIVE, DESIGN, SETTING, PATIENTS, RESULTS. Meshes: Acclimatization, Adult, Altitude, Analysis of Variance, Case-Control Studies, Female, Humans, Male, Oxygen, Retrospective Studies, Syncope.
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Is syncope related to moderate altitude exposure? Context: To investigate factors related to syncope occurring on recent ascent to moderate altitude. A 1-year retrospective case-control study, using local acclimatized residents as a control group. The two main ambulance destinations for Summit County, Colorado (elevation, 2770 m). All patients with a diagnosis of syncope, near-syncope, or fainting whose medical records were available for review. There was a significant relationship (P less than .05) between syncope of unknown origin and recent arrival at altitude (less than 24 hours), and a significant inverse relationship (P less than .05) between syncope of unknown origin and arterial oxygen saturation as measured by pulse oximetry.
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Short-term exposure to moderate altitude may be related to otherwise unexplained syncope in healthy young adults. We suggest the name high-altitude syncope for this entity and encourage further research in this area.