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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==
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==Keywords==
==Keywords==
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