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Pulmonary shunting by the bronchial artery in the anaesthetized horse
R D Gleed1, A Dobson, R P Hackett
1Department of Clinical Science, New York State College of Veterinary Medicine, Cornell University, Ithaca 14853.
Experimental Physiology
|January 1, 1990
Abstract:
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.