Received: 7 December 2020
Accepted: 18 February 2021
First Online: 2 March 2021
Ethics approval and consent to participate
: The study involving four patients with the record of the airway pressure into the oro-nasal mask was approved by Mondor Institutional Review Board, and a written informed consent was obtained from each patient. The clinical study was approved by the institutional ethical committee of the French Intensive Care Society as a component of standard care. Patient consent was waived.
: A written informed consent was obtained from each patient in whom the airway pressure was recorded into their oro-nasal mask. Patient consent was waived in the clinical retrospective observational study.
: G. Carteaux reports personal fees from Air Liquide Medical System and Löwenstein, outside the submitted work. A. Lesimple is PhD student in the (Med<sub>2</sub>Lab) partially funded by Air Liquide Medical Systems. B. Badat is research engineer in the Med<sub>2</sub>Lab funded by Air Liquide Medical Systems. F. Beloncle reports personal fees from Löwenstein Medical and research support from Covidien, GE Healthcare and Getinge Group, outside this work. A. Mercat reports personal fees from Faron Pharmaceuticals, Air Liquid Medical Systems, Pfizer, Resmed and Draeger and grants and personal fees from Fisher and Paykel and Covidien, outside this work. J.C. Richard reports part time salary for research activities (Med<sub>2</sub>Lab) from Air Liquide Medical Systems and Vygon and grants from Creative Air Liquide, outside this work. A. Mekontso Dessap reports grants from Fischer Paykel, Baxter, Philips, Ferring and GSK, personal fees from Air Liquide, Baxter, Amomed, Getinge and Addmedica, outside the submitted work. All other authors declare no competing interests.