Non-invasive positive-pressure ventilation with positive end-expiratory pressure counteracts inward air leaks during preoxygenation: a randomised crossover.

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Non-invasive positive-pressure ventilation with positive end-expiratory pressure counteracts inward air leaks during preoxygenation: a randomised crossover controlled study in healthy volunteers  J.-L. Hanouz, F. Le Gall, J.-L. Gérard, N. Terzi, H. Normand  British Journal of Anaesthesia  Volume 120, Issue 4, Pages 868-873 (April 2018) DOI: 10.1016/j.bja.2017.12.002 Copyright © 2017 British Journal of Anaesthesia Terms and Conditions

Fig 1 Part of the breathing circuit showing the T-shaped piece used to calibrate air leak and the pneumotachograph sensor. British Journal of Anaesthesia 2018 120, 868-873DOI: (10.1016/j.bja.2017.12.002) Copyright © 2017 British Journal of Anaesthesia Terms and Conditions

Fig 2 Time course of expired oxygen fraction between groups. PPV-leak, non-invasive PPV group with a calibrated air leak; SB, spontaneous-breathing group without air leak; SB-leak, spontaneous-breathing group with a calibrated air leak. British Journal of Anaesthesia 2018 120, 868-873DOI: (10.1016/j.bja.2017.12.002) Copyright © 2017 British Journal of Anaesthesia Terms and Conditions

Fig 3 Kaplan–Meier plot for the probability that expired oxygen fraction reached 90%. PPV-leak, non-invasive PPV group with a calibrated air leak; SB, spontaneous-breathing group without air leak; SB-leak, spontaneous-breathing group with a calibrated air leak. British Journal of Anaesthesia 2018 120, 868-873DOI: (10.1016/j.bja.2017.12.002) Copyright © 2017 British Journal of Anaesthesia Terms and Conditions

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