Forum · Cpap induced hypothermia?

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[-] truckerdad57 +0 points · about 3 years ago

When using cpap (or bipap) in cold ambient air conditions (below 40 deg f) have others experienced waking up with Uncontrollable shivering (stage 2 hypothermia)?

The larger than normal quantity of cold air into the airway overwhelming the body's efforts to stay warm. As specially designed pap are used in cold water immersion hypothermia cases for re warming it makes sense to me.

I've had it and it scared the poop out of me. I work with truck drivers who use cpap often in unheated semi truck sleeper berths and regularly get reports of this.

I can't find any research on the topic. The cpap machine manufacturers just refer to the technical specifications for the machine.

Could this be a potential research question?

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[-] MakeSleepAPriority +0 points · about 3 years ago

Great idea TruckerDad. I'm thinking the outcomes research question would be something like "How does the health of truckers using CPAP without heated humidity in cold sleeping environments differ from those who don't ?" There may be both negative and positive effects. What we need is a lot of truckers in the network to have a large number of people respond to outcomes research surveys. So the immediate question is how can we get lots of truckers signed up? Any ideas? The great thing about is that it's not just a place to talk. The talk can be turned into real research with real impact for everyone. The larger the number of members completing surveys, the more impact the outcomes have which can result in more diagnostic and treatment changes for sleep apnea and sleep.

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[-] TheCentralScrutiniser +0 points · 2 days ago

I'm a 55 year old male who works in anaesthesia and especially in cardiothorasics, and have much experience in both inducing and reversing hypothermia.

I started using CPAP machine therapy for my own sleep apnoea in the early winter months of 2017 (January/February) and frequently awoke shivering, even though the ambient temperature was not so low as previously to have caused shivering. At that time I was using the CPAP without warmed and moistened air and kept the machine on the floor, where I did observe it was drawing in much colder air than would be the case higher up.

I moved the CPAP machine such that it was at the same level as my heart. However, the shivering persisted, though not to as great an extent as previously so. My specialist had never heard of this issue.

I then started using the water tank and warming the air and all was fine throughout the summer months. However, despite using the warming unit and keeping the machine at heart level, I have recently started shivering again since the cold winter is drawing in.

On each occasion I ascertained that it was not attributable to hypoglycaemia. My only conclusion, without extended formal research, is that it is down to the CPAP machine forcing in larger volumes of relatively cold air than my body has been accustomed to.

I know from my readings of anecdotes on this forum and elsewhere, that I'm not alone in this experience.

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