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Ron you ask a good question, but I have bad news

1. The medical community are discouraging it because coughs do not discharge droplets through the exhalation ports but aerosols that puts several caregivers in the room at a higher risk. His is where n95 masks and full ppe is needed
2 based on early cases, when NIV was applied to delay intubation, the death rates rose. Respiratory failure happened quickly. It is recommended to intubate early.
3. Home CPAP can allow for 6 to 8 liters of oxygen added, which maybe can deliver 40% oxygen. However sick patients may need 80 to 100% plus peep (or cpap) of 18 which a home machine may not meet. With people that sick, they need sedation which suppresses breathing, requiring a ventilator rate. Wearing home CPAP for shortness of breath may delay seeking care. Remember what I said in #2. Patients deteriorate very quickly.

Use CPAP for obstructive sleep apnea and not to support shortness of breath. And if you catch it, be considerate of who you sleep with because that person will inhale infected aerosols deep into the lungs. Separate instead.
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