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Cerebral oxygenation at high altitude and the response to carbon dioxide, hyperventilation and oxygen
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Imray, C. (Chris), Brearey, S., Clarke, T., Hale, D., Morgan, J., Walsh, S. and Wright, A. D.. (2000) Cerebral oxygenation at high altitude and the response to carbon dioxide, hyperventilation and oxygen. Clinical Science, Vol.98 (No.2). pp. 159-64. ISSN 0143-5221
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Official URL: http://www.clinsci.org/cs/098/cs0980159.htm
Abstract
Cerebral oxygenation is likely to be of critical importance in determining function at high altitude. The present study has used the technique of near-IR spectroscopy to monitor changes in cerebral regional oxygenation in response to inhaled carbon dioxide, hyperventilation and supplementary oxygen on ascent to 4680 m over 3 days. At sea level, inhaled CO(2) resulted in a significant rise in cerebral regional oxygenation [from mean 69.6% (S.D. 2.4% to 71. 1+/-2.3%; means+/-S.D.; P<0.001). At 4680 m, CO(2) increased regional cerebral oxygenation (63.8+/-2.5% to 65.9+/-2.2%; P<0.001) and also increased peripheral oxygen saturation (75.1+/-6.1% to 83. 6+/-4.0%; P<0.001). Voluntary hyperventilation resulted in improved peripheral oxygen saturation at 2770 m, 3650 m and 4680 m, whereas cerebral regional oxygenation was reduced at sea level and at 2770 m, unchanged at 3650 m and increased at 4680 m. Supplementary oxygen (6 1itres/min) at 4680 m resulted in greater improvements in peripheral oxygen saturation (76.7+/-7.9% to 98.1+/-1.5%; P<0.001) and cerebral regional oxygenation (64.6+/-3.3% to 70.6+/-2.9%; P<0. 001) than were found with CO(2) or hyperventilation. We conclude that attempts to increase CO(2) inhalation or ventilation at high altitude are likely to be beneficial for cerebral oxygenation in the short term.
| Item Type: | Journal Article |
|---|---|
| Divisions: | Faculty of Medicine > Warwick Medical School > Metabolic and Vascular Health Faculty of Medicine > Warwick Medical School |
| Journal or Publication Title: | Clinical Science |
| Publisher: | Portland Press |
| ISSN: | 0143-5221 |
| Date: | February 2000 |
| Volume: | Vol.98 |
| Number: | No.2 |
| Page Range: | pp. 159-64 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Description: | The Birmingham Medical Research Expeditionary Society |
| URI: | http://wrap.warwick.ac.uk/id/eprint/52235 |
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