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Pulmonary shunting by the bronchial artery in the anaesthetized horse
Author(s) -
Gleed RD,
Dobson A,
Hackett RP
Publication year - 1990
Publication title -
experimental physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.925
H-Index - 101
eISSN - 1469-445X
pISSN - 0958-0670
DOI - 10.1113/expphysiol.1990.sp003378
Subject(s) - shunting , medicine , hypoxic pulmonary vasoconstriction , bronchial artery , anesthesia , halothane , pulmonary artery , horse , constriction , vasoconstriction , arterial blood , blood flow , cardiology , lung , biology , paleontology
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.