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The halogenated volatile anesthetic agents decrease alveolar ventilation mainly through which of the following mechanisms? | The halogenated volatile anesthetic agents decrease alveolar ventilation mainly through which of the following mechanisms? | ||
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D. Decreased airway musculature tone | D. Decreased airway musculature tone | ||
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==Answer== | ==Answer== | ||
The answer is A. This a favorite question of Dr. Yaster. The halogenated agents (halothane, sevoflurane, isoflurane and desflurane) all depress the ventilatory drive and responsiveness to carbon dioxide in a dose dependent fashion. This is mainly done through a DECREASE IN TIDAL VOLUME. Respiratory rates tend to increase up to 1 MAC and then decrease at levels above 1 MAC. Decreased airway tone is an effect, but usually causes obstruction, not decreased alveolar ventilation. | The answer is A. This a favorite question of Dr. Yaster. The halogenated agents (halothane, sevoflurane, isoflurane and desflurane) all depress the ventilatory drive and responsiveness to carbon dioxide in a dose dependent fashion. This is mainly done through a DECREASE IN TIDAL VOLUME. Respiratory rates tend to increase up to 1 MAC and then decrease at levels above 1 MAC. Decreased airway tone is an effect, but usually causes obstruction, not decreased alveolar ventilation. | ||
==Notes== | ==Notes== | ||
<references /> | <references /> | ||
==Keywords== | ==Keywords== | ||
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