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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Contribution of peripheral chemoreception to the depression of the hypoxic ventilatory response during halothane anesthesia in cats.

BACKGROUND: The effects of inhalational anesthetics on the hypoxic ventilatory response are complex. This study was designed to determine the contribution of peripheral chemoreception to the depression of hypoxic ventilatory response seen with halothane anesthesia. METHODS: Cats were anesthetized with pentobarbital sodium and alpha-chloralose and artificially ventilated. Respiratory output was evaluated by phasic inspiratory activity of the phrenic nerve. In 12 cats, this activity was measured during inhalation of an hypoxic gas mixture with halothane, 0, 0.1, and 0.8%, with intact or denervated carotid bodies. In 10 cats, a carotid body was isolated from the systemic circulation and perfused with hypoxic Krebs-Ringer solution equilibrated with halothane, 0, 0.1, and 0.8%. RESULTS: The hypoxic ventilatory response was depressed in a dose-dependent manner during halothane anesthesia. In carotid body perfusion studies, the response was significantly depressed only with halothane, 0.80%. CONCLUSION: The hypoxic ventilatory response is depressed by a high dose of halothane through a peripheral effect at the carotid body.[1]


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