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J Appl Physiol 41: 348-355, 1976;
8750-7587/76 $5.00
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Journal of Applied Physiology, Vol 41, Issue 3 348-355, Copyright © 1976 by American Physiological Society

ARTICLES

Decompression-induced decrease in nitrogen elimination rate in awake dogs

B. G. D'Aoust, K. H. Smith and H. T. Swanson

Formulation of safe decompression procedures still requires unproven assumptions regarding both gas equilibration rates and the associated ascent criteria. Although the assumption of symmetry of uptake and elimination rates has been suspect for several years, few data are available. Measurements of actual mixed venous blood nitrogen content [vN2] during compression and following decompression in chronically catheterized awake dogs have clearly demonstrated that desaturation is markedly slower than saturation, and that this effect can be imposed by decompression. The disappearance of arteriovenous nitrogen concentration differences during desaturation following a decompression that produced decompression sickness indicates that cardiopulmonary and cardiovascular changes induced by mechanisms associated with decompression per se can potentiate its deleterious effects. Current US practices do not provide for such asymmetry, while those used in the UK have incorporated this in their models for the last decade.


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B. D'Aoust, K. Smith, H. Swanson, R White, C. Harvey, W. Hunter, T. Neuman, and R. Goad
Venous gas bubbles: production by transient, deep isobaric counterdiffusion of helium against nitrogen
Science, August 26, 1977; 197(4306): 889 - 891.
[Abstract] [PDF]


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