Abstract
The carbon dioxide distribution inside the Bain breathing circuit was measured during controlled ventilation in 14 patients. A circuit with seven equi-distant sampling ports was constructed and gas samples were also taken at the gas machine end of the circuit and from a catheter ending near the tip of the tracheal tube. The carbon dioxide concentration was measured with a mass spectrometer. After 30 minutes of a stable halothane or ethrane anaesthesia, the maximum and minimum carbon dioxide concentration was determined at each sampling site; after that either tidal volume, inspiration to expiration ratio, respiratory rate (with and without change in minute ventilation) or fresh gas flow were changed, keeping all other parameters constant. The carbon dioxide measurements were repeated after an interval of at least 20 minutes. Each change was recorded in at least two patients. Only qualitative changes obtained in an individual patient were compared.
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