Measurements of minute volume, airway pressure, and inspired and end-expired carbon dioxide concentrations were made on anaesthetized children during the use of controlled ventilation with a modified T-piece system. The data obtained indicate that a fresh gas inflow as low as 100 ml/lb. (220 ml/kg) body weight per minute, with a minimum total flow of 3 l./min, is sufficient to prevent carbon dioxide retention. The influence of the rate of ventilation upon end-expired carbon dioxide concentration also was assessed.
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