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  • Title: Effect of anaesthesia on the pattern of breathing.
    Author: Vízek M, Palecek F.
    Journal: Physiol Bohemoslov; 1977; 26(5):417-23. PubMed ID: 144924.
    Abstract:
    The pattern of breathing of male rats was studied after stimulating respiration with carbon dioxide at different levels of general anaesthesia. Anaesthesia was induced by the inhalation of halothane or by the i.p. injection of urethane. Ventilation values were measured in intubated rats in body plethysmograph. It was found that a linear relationship between minute ventilation and tidal volume was maintained during the decrease of minute ventilation due to deepening of anaesthesia. The slope of the relationship after stimulating respiration with carbon dioxide also diminished during deeper anaesthesia. The duration of inspiration did not alter significantly, despite marked changes in tidal volume. Tidal volume correlated with the duration of expiration at different anaesthesia levels. In vagotomized rats, the duration of expiration shortened as ventilation was depressed by deepening anaesthesia.
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