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Modifying Philips AutoSV Bipap Machine Lowest setting

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VioletSwan +0 points · 7 months ago Original Poster

Hey Guys,

My sleep apnea is quite variable. I want to reduce my lowest setting of AutoSV Bipap from 4 to 1. How to do this? Any ideas?

I am very technical so I can understand any highly technical suggestions.

thanks Sal

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bonjour +0 points · 6 months ago Sleep Commentator

You cannot, no one can, 4 is the lowest setting (3 on 1 particular machine) Why what are you trying to do and what are your settings?

Fred

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VioletSwan +0 points · 6 months ago Original Poster

I do not know if you will believe me but I have developed a method to reduce my central apnea. It has come down from severe level to 4. I am working to eliminate it. So, I need lower settings to cope with it right now until it's gone. again, I did not want to share this information as it's research work and research paper is not published yet but you asked for it. so, do you know a way to reduce lowest pressure to 4? it will help me. any ideas about hooking up some of it's management software and re-configure these settings which appear static?

as I said earlier, my settings are variable. My upper pressure currently does not go above 7-8.

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Sierra +0 points · 6 months ago Sleep Innovater

There is an easy way to reduce pressure to zero. Just don't use the machine! The machines I know about all have a minimum limit of 4 cm. Not totally sure why they do that, but they may want to ensure there is always flow and no reverse flow. Also when taking deep breaths the machine always lags behind the demand for air. They perhaps do not want to see the pressure go negative. ResMed machines show mask pressure which is an estimate of the actual pressure at the mask. When you zoom in with SleepyHead you can see how much pressure fluctuates when it is set for a constant value. It can be significant.

There is one possible way you could get a lower pressure, but I don't know how safe it would be. The machine measures pressure at the machine and estimates pressure in the mask using pressure drop flow calculations. If you were to use a longer and/or smaller hose the pressure drop would increase and as a result you would get lower pressure at the mask. Not sure about the Respironics machines but the ResMed ones have a setting for the hose type. If your machine has that, you could perhaps set it for a larger hose than the one you really have. Your indicated pressure would then be no longer correct, and would be lower than indicated.

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VioletSwan +0 points · 6 months ago Original Poster

that sounds good advice. It's one option. how about I poke holes in my mask? will that work?

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Sierra +0 points · 6 months ago Sleep Innovater

Not likely to work. The machine is designed to compensate for quite large leaks.

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VioletSwan +0 points · 6 months ago Original Poster

seems like I'll need to design my own machine,

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