Journal of Applied Physiology
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J Appl Physiol 45: 171-176, 1978;
8750-7587/78 $5.00
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Journal of Applied Physiology, Vol 45, Issue 2 171-176, Copyright © 1978 by American Physiological Society

ARTICLES

Changes in ventilatory pattern induced by intravenous anesthetic agents in human subjects

H. Gautier and J. H. Gaudy

The tidal volume-inspiratory duration relationship was studied during air breathing and rebreathing in conscious and anesthetized human subjects using three different intravenous agents. The results observed have been compared with similar experiments carried out in cats. Its has been shown that anesthesia provokes an increase in breathing rate associated with a decrease in tidal volume in human subjects; an opposite effect on breathing rate was observed in cats. Thus, the tidal volume-inspiratory duration relationship, although very similar in the conscious cat or human subject, is very different under anesthesia. The results were quite consistent in a given species whatever the nature of the drug used. It is suggested that modifications of the breathing rate by anesthesia, related to animal species, are caused by central effects of the drug. These effects are probably mediated by different actions on inputs to the inspiratory "off-switch" mechanisms in the two species.


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P. D. Larsen, Y. C. Tzeng, and D. C. Galletly
Quantal ventilatory variability during spontaneous breathing anaesthesia
Br. J. Anaesth., August 1, 2003; 91(2): 184 - 189.
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