A Method for Measuring the Functional Residual Capacity and Dynamic Lung Compliance During Oxygen and Halothane Inhalation

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Abstract
No convenient method has been available to simultaneously assess end-expiratory lung volume (FRC) and lung compliance during undisturbed anesthesia. A method Is presented for this purpose which utilizes the closed circuit helium dilution technique. Corrections are applied to helium meter readings for the thermal conductivity effect of changing oxygen and halothane concentrations. The method can be applied to the awake post-operative patient breathing various concentrations of O2, and to the subject anesthetized with halothane and oxygen (or the laboratory animal).

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