Experimental Physiology
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Experimental Physiology 75.1 pp 115-118
© The Physiological Society 1990
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Experimental Physiology, Vol 75, Issue 1, 115-118
Copyright © 1990 by The Physiological Society

Article

Pulmonary shunting by the bronchial artery in the anaesthetized horse

RD Gleed, A Dobson, and RP Hackett

In the quietly standing horse the bronchial arterial blood flow is low, 0.1-0.2% of the pulmonary arterial flow. In horses anaesthetized with halothane, the bronchial arterial flow is reduced by a greater fraction than that in the pulmonary artery. Thus the shunting through the bronchial circulation is decreased about 3-fold by anaesthesia, and cannot, therefore, contribute significantly to the increased alveolar-arterial gradient seen in dorsal recumbency. The results indicate bronchial vasoconstriction under anaesthesia.


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