Supplemental oxygen and sleep at altitude

Area of Science:

• Altitude Medicine
• Sleep Physiology
• Respiratory Medicine

Background:

• Sleep at high altitudes often leads to respiratory and cardiovascular challenges.
• Understanding the impact of supplemental oxygen on these physiological responses is crucial for mountaineers.

Observation:

• A novel ambulatory, multisensor device continuously monitored a subject at 4900m and 5700m.
• Supplemental oxygen was delivered via a nasal demand system with varying pulse doses (0-50 mL/sec).

Findings:

• Increasing oxygen pulse doses consistently raised blood oxygen saturation (SaO2) and decreased minute ventilation.
• The highest oxygen dose (50 mL/sec) significantly improved SaO2 from 68.5% to 81% and reduced minute ventilation.
• Supplemental oxygen administration led to a substantial decrease in the apnea/hypopnea index (AHI), indicating fewer breathing interruptions during sleep.

Implications:

• Supplemental oxygen effectively mitigates sleep-disordered breathing at high altitudes.
• The study highlights the efficacy of a novel monitoring device for assessing physiological responses to altitude.
• Findings suggest potential benefits for mountaineers and high-altitude dwellers using supplemental oxygen during sleep.