Pressure on an ICU ventilator is measured in units of *tenths of a cm H20* -- that's THOUSANDTHS of psi. Those "DIY ventilator" projects that are basically a bag, a pump, and a mask? They're probably not this precise. (No calibration measurements listed, at any rate.)
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If you want to
#buildventilators to help with the COVID19 crisis you're going to have to match the specs on the kind of ventilators used for long-term care of patients with ARDS. Bag ventilators are for emergency first aid and temporary breathing support.Show this thread -
Here's a doctor demonstrating how you use an ambu bag. https://www.youtube.com/watch?v=1goz1l28kUQ … Obviously, the pressure isn't precise here, since he's just squeezing the bag by hand. But I think (?) that's just erring on the side of too little pressure because you're going to escalate anyway.
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Is that level of control actually important for patient outcome?
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I don't know exactly. ICU doctors & nurses seem to think so but I don't know of experiments that have been run to test it.
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