More than one in three healthy adults developed cardiac arrhythmias, most commonly bradyarrhythmias, while climbing Mount Everest, a study found.
Results of the SUMMIT study confirm the association between exposure to high altitude and the occurrence of cardiac arrhythmia, with more than one in three healthy individuals experiencing bradyarrhythmia or tachyarrhythmia while climbing Mount Everest.Arterial hypoxemia, electrolyte imbalances, and periodic breathing increase the vulnerability to cardiac arrhythmia at altitude.None of the men had signs of exertional ischemia, wall motion abnormality, or cardiac arrhythmia at baseline.
The primary endpoint was the incidence of a composite of supraventricular and ventricular tachyarrhythmia and bradyarrhythmia , 32 climbed to ≥ 7900 m, and 14 reached the summit of Mount Everest . Forty-three bradyarrhythmic events were documented in 13 climbers ; seven men had a total of 23 bradycardias at rest, and 10 had 19 bradycardias during exercise; one individual had two episodes of third-degree atrioventricular block at rest at an altitude of 6500 m.during descent from 7900 m and one had a slow monomorphic sustained ventricular tachycardia during the ascent from 6500 m to 7300 m.
Most rhythm disturbances were recorded at an altitude < 7300 m at which a majority of climbers did not use supplemental oxygen, whereas numerically fewer rhythm disturbances occurred on supplemental oxygen, despite higher altitude."The results of the SUMMIT study showed a substantial incidence of cardiac arrhythmia at extreme altitude. The potential implications of the observed rhythm disturbances need to be explored in future studies," the authors concluded.
Altitude-Related Disorders Altitude Sickness Acute Mountain Sickness Altitude Illness Third-Degree Atrioventricular Block Third-Degree Av Block Third Degree Heart Block Complete Heart Block Third Degree Atrioventricular Block Third Degree Av Block Ventricular Tachycardia Treadmill And Pharmacologic Stress Testing Cardiac Stress Test Exercise Stress Test Cardiac Testing
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