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[Treatment] Oxygen use with an ASV machine - What is the correct oxygen setting.
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mpeter7734 Offline

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Posts: 2
Joined: Jan 2015

Machine: Respironics ASV
Mask Type: Full face mask
Mask Make & Model: S9
Humidifier: Clear Humidifier
CPAP Pressure: 5-20
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location:

Post: #1
Oxygen use with an ASV machine - What is the correct oxygen setting.
My Equipment:
Machine/Concentrator:I use a full face mask with my new ASV machine. The doctor has ordered 2L of oxygen to go with the machine. The DME supplied the adapter so the oxygen is delivered as part of the air coming from the machine.
My concentrator produces 90-99% oxygen 1L-5L/min.
Now my intelligence tells me that 2L is standard starting point if you are on a cannula (nose hose).

Now, the full face mask has a vent (during in-hale) that is about 12L per minute. Inspiration time 2seconds volume 400ml. That means 12L/30=400ml +400ml for in-hale = 800ml of 20% air and 2L/30=67ml of 90%. This would then mean that the 90% oxygen is being diluted to 25.4% oxygen.

At 5L/min oxygen: 12L/30=400ml +400ml for in-hale = 800ml of 20% air and 5L/30=167ml of 90%. This would then mean that the 90% oxygen is being diluted to 31.3% oxygen.

What is considered too high or too low or just right for someone that has 50 corrected apneas/hour with a blood oxygen of 87% or lower during apneas.

Consider that I live at 6000ft, the percent of oxygen remains the same, but the amount of molecules because of pressure difference is 25% less as well.

Thank you for your response.
Mark
06-24-2015 01:41 AM
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justMongo Offline

Monitors

Posts: 3,855
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

Other Comments: μολὼν λαβέ

Sex: Male
Location: Калифорния

Post: #2
RE: Oxygen use with an ASV machine - What is the correct oxygen setting.
My O2 Rx is the same. My doc warned me not to increase the O2 flow.
One risk associated with increased O2 flow is a collapsed lung.
O2 is pulled across the lung membrane in the avioli very quickly as hemoglobin the the blood attaches to it for transport.
This rapid decrease in gas volume can cause a spontaneous pneumothorax.

I would not mess with the flow.

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06-24-2015 06:30 AM
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trish6hundred Offline

Advisory Members

Posts: 6,452
Joined: May 2012

Machine: Resmed S9 AutoSet for Her
Mask Type: Full face mask
Mask Make & Model: Fisher & Paykel Simplus
Humidifier: H5i Heated Humidifier
CPAP Pressure: 10 - 7-20 Cm H2O
CPAP Software: Not using software

Other Comments: I started CPAP in 2008. Totally blind since birth.

Sex: Female
Location: Missouri, USA

Post: #3
RE: Oxygen use with an ASV machine - What is the correct oxygen setting.
Hi mpeter7734,
WELCOME! to the forum.!
Hang in there for more answers to your question.
Much success to you with your CPAP therapy.

trish6hundred
06-24-2015 08:07 AM
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mpeter7734 Offline

New Members

Posts: 2
Joined: Jan 2015

Machine: Respironics ASV
Mask Type: Full face mask
Mask Make & Model: S9
Humidifier: Clear Humidifier
CPAP Pressure: 5-20
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location:

Post: #4
RE: Oxygen use with an ASV machine - What is the correct oxygen setting.
Thanks for the info. Yes, my wife warned me that too much oxygen can cause veins to collapse and even lungs if way too much. I have a CMS50D+ oximeter ordered and to be here tomorrow. With that, I should be able to see what my saturation level is through out the night. I will post the results once I use it. My AHI is 0 to 1. So I am happy with that, but I just don't know if the corrected apneas are actually exchanging air or just moving air between my lungs and throat/mouth. With 0 to 1, I would think I would feel a lot better than I do.

trish6hundred: How do you like the nasal pillow? I have never tried it but was told it could be uncomfortable because it pushes the nose up to get a seal.
06-24-2015 01:32 PM
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