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. 1973 Dec;235(3):607–623. doi: 10.1113/jphysiol.1973.sp010407

The action of carbon dioxide on constricted airways

T W Astin, Gwenda R Barer, J W Shaw, Patricia M Warren
PMCID: PMC1350783  PMID: 4772402

Abstract

1. In artificially ventilated open-chest cats and dogs ventilation with 5-15% CO2 reversed the bronchoconstriction caused by drugs or by pulmonary artery occlusion. Total lung resistance, `static' lung compliance, and intratracheal or intrabronchial pressure at constant pump stroke were measured.

2. CO2 reduced resistance and increased compliance of the lung during infusions of 5-hydroxytryptamine (5-HT), histamine and acetylcholine in cats. In dogs CO2 reduced resistance during 5-HT infusions; it caused small reductions in intratracheal pressure but no significant change in resistance during infusions of histamine and acetylcholine. Even in cats CO2 had a larger effect during 5-HT than during histamine and acetylcholine infusions.

3. Occlusion of a pulmonary artery caused increases in resistance and decreases in compliance in the affected lobes of both cats and dogs. These changes were partly reversed by ventilation with high CO2 mixtures.

4. The bronchodilator action of CO2 took place over a wide range of Pa, CO2 values (20-100 torr).

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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