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2) enhances oxygenation and increases carbon dioxide clearance in mechanically ventilated patients JAS Ball, R Cusack, A Rhodes, RM Grounds P18 Optimal method of flow and volume monitoring in patients mechanically ventilated with helium–oxygen (He–O P4 A laboratory assessment of the learning and retention of skills required to use the Combitube and Laryngeal Mask Airway by non-anaesthetists.