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Not a doctor. A major issue with using this type of CPAP machine on a Covid-19 positive person is the high amount of aerosolized virus particles it exhausts. Anyone using this should be extremely careful and know what they're doing. That being said, doctors in many countries are using positive air pressure machines with an air-tight helmet/bag with filtered exhaust.


Mt. Sinai developed a procedure for using these safely in a clinical setting, by using an alternate patient circuit with viral filters to capture the aerosolized particles: https://health.mountsinai.org/wp-content/uploads/sites/14/20...


That's what it says right there on the page already: "Additional equipment like viral filters are also required."


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Actually yes(not that this is particularly dangerous) . It happens litteraly all the time. Ever seen all those "don't try this at home" disclaimers? Also someone published a book called "the anarchist cook book" on how to make rudimentary explosives and manufacture illicit substances such as LSD. You can find a pdf of it with a quick google search.


Both of those have fairly obvious consequences. I can definitely see people using this and not recognizing it can put other people in harms way.


This kind of concern-trolling on threads like this gets really tiresome.

Anyone in such a role where they will be fitting ventilators to people (i.e., highly educated, experienced and employed in a critical care role) will understand that this is outside of standard practice and that extra caution will need to be taken and considerations made for the different functionality and behaviour of the machine.

Can't we just appreciate the spirit of inventiveness in a crisis, without having to spoil it by fretting about issues that any grown adult working with this stuff will be fully capable of considering?


I definitely do. One of the main differences is this specifically is not mass-marketed, and I agree that anybody would would have the capability of doing this should already have the knowledge to not fuck it up. I'm just saying its a false equivalency between the two


This post is a perfect distillation of why there should be more history and other humanities subjects in traditionally STEM educations.

>Can't we just appreciate the spirit of inventiveness in a crisis, without having to spoil it by fretting about issues that any grown adult working with this stuff will be fully capable of considering?

Can't we just appreciate the inventiveness of using radium to light up watch dials? Or the inventiveness of the first friction matches?

Someone who is educated or trained doesn't necessarily make a dangerous invention a net-positive.


Please don't make patronising assumptions: my education and topics of interest are far more focused on humanities than STEM.

The examples you cite are not at all apt comparisons, as the risks and mitigation techniques are well known to the highly experienced adults using the equipment, as has been reported elsewhere.

This is a crisis like no other and it is bringing out incredible inventiveness and creativity in the determination to save lives.

That's what should be celebrated.

Nobody is saying due caution should be disregarded.


I sure enjoyed my copy of the Anarchist Cookbook as a teen. :)


I believe so, yes. I like to think people can make reasonable decisions with information they are provided


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This is pandering to an extreme situation in order to make a case... I think anyone on HN will acknowledge that people are on a scale from "not reasonable" to "very reasonable".

You're pushing the comment you're responding to over to a binary point of view. I don't believe in good faith that shijie meant "all of the time" when they said "I like to think people can make reasonable decisions with information they are provided". To push their statement to "all of the time" while bringing the ethics of law into this conversation seems disingenuous to the safety/disclaimer concerns you originally called into question.

Personally, I found the disclaimer on the airbreak.dev site to be very clear and appreciated it was on the front-page directly following the product summary. It is clear to me that this is an "in-development" project that is not ready for real-world deployment yet - they're being quite clear/transparent with these facts.


Absolutely, yes.


If you're using this where non-COVID patients could be exposed (e.g. at home) this is a very important consideration.

In a hospital setting (aka an emergency), it's less of an issue. The situation that would warrant this would likely also warrant full PPE just to enter a unit or building.


> it's less of an issue. The situation that would warrant this would likely also warrant full PPE just to enter a unit or building.

Isn't it still important not to spray covid everywhere?

See for example this post: https://emcrit.org/emcrit/covid-airway-management/

> Critical Note: If you use the vent for preox, you MUST disconnect the vent circuit proximal to the viral filter before removing the mask. Otherwise, COVID will be sprayed all around the room!!!!! See Triple C below.

{EDIT: genuinely don't know why this got downvotes.}


What's scary is that CPAP machines are allowed on airplanes. If they really aerosolize virus particles, maybe they shouldn't be.


I don’t want to alarm you unnecessarily, but they let ordinary people with virus aerosolizing equipment (lungs + diaphragm) onto airplanes, currently.


There's a special, enhanced, risk with CPAP that authoritative medical sources warn about.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3338532/

I'm not sure I get your point. Did you have one?


At least on Delta flights they’re not allowed to be used, I’m not sure if the same policy exists on other airlines.

Edit: I was wrong, see below


I'd be very surprised to see any airline restrict the use of a medical device onboard. The manual that came with mine states that airlines are required to let you use it, and the manufacturer sells an airline-friendly battery pack. Do you have a link to Delta's policy on this?


My mistake, I was wrong. They allow use, but it has to have its own power supply https://www.delta.com/us/en/accessible-travel-services/assis...


This would seem to be because they don't want to be held to providing medical grade reliability of electricity to the seat.


I've sat next to people using them on Delta and United. Of course, I'm not without empathy for people who depend on them. But if a person has a viral infection that can be spread through droplets, this can be a very dangerous situation. If I'm ever in this situation again, I'll ask to be reseated. If they can't do that, I'm not sure I'd want to fly.


You'd better not let someone sitting next to you breathe, or cough, or sneeze then.

When I'm using my CPAP, my mouth is closed and I'm asleep. I'm breathing through my nose, which has hairy filters in it, plus a mask that has a filter on its exhaust, plus the machine has a filter on its inlet.

Please stop the knee-jerk reactions. CPAP devices and aerosolized droplets are a problem if you know the patient is infected and you are up close to them putting the masks on.


These are not "knee-jerk" reactions.

There's a special, enhanced, risk with CPAP that authoritative medical sources warn about.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3338532/

Let's be civil here and assume good faith.


The parent commenter only mentioned that it exhausts aerosolized virus particles, not that it produces any. Do they emit/amplify aerosolized virus particles themselves? If so, by what mechanism?


If anything, more tubing would might condense humid lung air in the walls so whatever leaves the tubes is drier.




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