Contributions of Changing Rib Cage—Diaphragm Interactions to the Ventilatory Depression of Halothane Anesthesia

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Abstract
The ventilatory response to CO2 was subdivided into that portion due to increasing rib cage expansion, and that due to increased diaphragmatic descent. Children (5) were studied, awake and anesthetized with halothane, 0.8-0.9%. During anesthesia there was a 67 .+-. 8% reduction (mean .+-. SE) in slope of response of overall ventilation to an increase in CO2. This was primarily due to an 89 .+-. 8% reduction in the recruitment of rib cage ventilation (P < .001). There was no significant change in slope of the diaphragmatic response (anesthetized value 19 .+-. 21% less than control) although the response curve was shifted to the right so that a higher CO2 concentration was needed to stimulate a given level of diaphragmatic excursion. Additional measurements of the inspiratory intercostal electromyogram in 3 adult subjects documented a rapid, profound depression of intercostal activity with halothane anesthesia that was associated with a marked decrease in rib cage ventilation. A major component of the ventilatory depression associated with halothane anesthesia apparently results from preferential suppression of intercostal muscle function with relative sparing of diaphragmatic activity.