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http://www.anaesthesia.med.usyd.edu.au/resources/lectures/ventilation_clt/ventilation.html

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Breathless Journalism

from https://old.reddit.com/r/pics/comments/foo7qm/italian_guy_designed_a_3d_printable_valve_to_turn/ [–] Vandimal88 184 points 14 hours ago   It looks like it would essentially work as non-invasive positive airway pressure similar to CPAP or BIPAP. That still uses positive pressure to force air into the lungs but without a tube that goes down the trachea past the vocal cords. There are many limitations on this kind of ventilation compared to intubation. With intubated patients you can control parameters such as positive end expiratory pressure (PEEP) which helps stent open the alveoli when they fill with fluid (acute respiratory distress syndrome) which is a common complication from COVID-19. You can’t reliably control all of these parameters with non-invasive positive airway pressure because it relies on the patient to be able to take their own breaths. They can tire out or if their mental status deteriorates and they are not able to maintain their airway ...
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Medical Definitions

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Medical Definitions http://www.anaesthesia.med.usyd.edu.au/resources/lectures/ventilation_clt/ventilation.htm https://www.openanesthesia.org/aba_respiratory_function_-_dead_space/ http://www.anaesthesia.med.usyd.edu.au/resources/lectures/ventilation_clt/ShoalBayPDFVSmall.pdf https://emedicine.medscape.com/article/304068-overview#a4 https://www.atsjournals.org/doi/full/10.1164/rccm.2303003 https://en.wikipedia.org/wiki/Bag_valve_mask supraglottic airway device (SAD) also known as superglautic device fig. from http://rc.rcjournal.com/content/59/6/920  
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