Nasal high-flow therapy delivers low level positive airway pressure

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Nasal high-flow therapy delivers low level positive airway pressure R. Parke, S. McGuinness, M. Eccleston British Journal of Anaesthesia Volume 103, Issue 6, Pages 886-890 (December 2009) DOI: 10.1093/bja/aep280 Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

Fig 1 Optiflow™ system set-up. a, Optiflow™ RT034 cannula; b, heater delivery tube RT241; c, MR880 heated humidifier; d, laptop interface; e, pressure transducer. British Journal of Anaesthesia 2009 103, 886-890DOI: (10.1093/bja/aep280) Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

Fig 2 Standard facemask set-up. g, Mask adapter (commercially unavailable). British Journal of Anaesthesia 2009 103, 886-890DOI: (10.1093/bja/aep280) Copyright © 2009 British Journal of Anaesthesia Terms and Conditions

Fig 3 Breathing pressure profile of one participant over 1 min. Nasopharyngeal pressure (cm H2O) generated at 35 litre min−1 using NHF with the mouth closed (NHFMC) is shown in black. Nasopharyngeal pressure (cm H2O) generated at 35 litre min−1 using a facemask with the mouth closed (FMMC) is shown in grey. British Journal of Anaesthesia 2009 103, 886-890DOI: (10.1093/bja/aep280) Copyright © 2009 British Journal of Anaesthesia Terms and Conditions