Clinical Study Clinical science (London, England : 1979) 2001

Carbon dioxide contributes to the beneficial effect of pressurization in a portable hyperbaric chamber at high altitude.

Imray CH, Clarke T, Forster PJ, Harvey TC, Hoar H, Walsh S, et al. — Clinical science (London, England : 1979), 2001

View Original on PubMed PMID 11171283

Tier 2, Indexed

Automatically imported from PubMed based on relevance criteria.

Summary

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.

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.

This plain-language summary is generated with AI assistance and checked against the source abstract before publication. See our editorial policy.

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Study Details

Study Type	Clinical Study
Category	Neurological
Source	Pubmed
PubMed ID	11171283
Year Published	2001
Journal	Clinical science (London, England : 1979)
MeSH Terms	Adult; Altitude; Ambulatory Care; Atmosphere Exposure Chambers; Atmospheric Pressure; Brain; Carbon Dioxide; Cerebrovascular Circulation; Environment, Controlled; Female; Humans; Male; Middle Aged; Oximetry; Oxygen

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Last reviewed: April 2, 2026 | Reviewed by: Canada Hyperbarics Editorial Team | Editorial process | Research sources | Counts & methodology