What Researchers Did
Researchers investigated regional cerebral and peripheral oxygenation in subjects inside a portable hyperbaric chamber at high altitude, examining the effects of pressurization and carbon dioxide accumulation.
What They Found
At 5005 m, pressurization increased peripheral oxygen saturation (SpO2) from 79.5% to 95.9% and cerebral regional oxygenation (rSO2) from 64.6% to 69.4%. However, removing inspired carbon dioxide caused SpO2 to drop from 95.9% to 93.6% and rSO2 to fall from 69.4% to 68.5%. These findings suggest carbon dioxide contributes significantly to the beneficial effects of pressurization.
What This Means for Canadian Patients
This research suggests that maintaining a certain level of carbon dioxide within portable hyperbaric chambers could enhance their effectiveness for treating altitude sickness. Patients experiencing acute mountain sickness might benefit from devices that optimize CO2 levels alongside pressure changes.
Canadian Relevance
This study has no direct Canadian connection.
Study Limitations
The study's estimation of carbon dioxide's contribution is based on specific altitude conditions and may not generalize to all high-altitude scenarios.