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Powerhands
Unread post  Post subject: What makes pressure increase?  |  Posted: Fri Nov 20, 2020 10:49 am

Joined: Fri Oct 02, 2020 4:46 pm
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I have a new ResMed AirSense 10 that I've been using for about a month. It's set for automatic and the setting is 4. Sometimes the machine suddenly cranks up to a pressure of 13 which usually wakes me up. When I look at the nights readings (OSCAR) you can clearly see the spike in pressure, but there is no corresponding loss of "leaking". The only obvious place to look for a reason in the increase in pressure would be my breathing pattern and this is where the problem arises. Logic would dictate that if I'm having some kind of event, that the machine would increase pressure, but my breathing pattern is even, uninterrupted, and unbroken - yet you can easily see (seemingly out of the blue) a drastic pressure increase which can last as long as a half hour - all accompanied by a normal breathing pattern, both before and after the pressure increase. I suppose my question would be, what parameters must be met for the machine to increase pressure? Or is the machine defective?


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DeltaBravo3.8
Unread post  Post subject: Re: What makes pressure increase?  |  Posted: Fri Nov 20, 2020 12:12 pm
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Joined: Sat Jul 04, 2020 8:38 am
Posts: 459
Location: Waynesboro, Pennsylvania, USA
PAP Mask: F&P Vitera & Simplus, ResMed F20 N/P30i & old Amara View
PAP Machine: RT says I need NIV ResMed Astral 150 soon
Humidifier: not now
Pressure Setting: wait for NIV

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Since we can't see any OSCAR data, it's hard to point out what caused the pressure increases you mention. It could be an event like obstructive apnea, a hypopnea, or a flow limit. Any of these will cause pressure to go up. It is normal to do this as the machine must respond to events.

You should share an OSCAR chart and I'm sure the reason can be pointed out. Be sure it includes Events, Flow Rate, Pressure, Leaks, and Flow Limit along without calendar, and showing your pressure stats on the left.

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Dave K9DWB 73s

https://www.sleepfiles.com/OSCAR
http://www.apneaboard.com/wiki/index.php/OSCAR_Help
http://www.apneaboard.com/wiki/index.php/OSCAR_Chart_Organization


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Powerhands
Unread post  Post subject: Re: What makes pressure increase?  |  Posted: Fri Nov 27, 2020 3:04 pm

Joined: Fri Oct 02, 2020 4:46 pm
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Attachment:
CPAP.png
CPAP.png [ 223.88 KiB | Viewed 417 times ]
I will try to attach this pic of what I'm talking about...


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Pugsy
Unread post  Post subject: Re: What makes pressure increase?  |  Posted: Fri Nov 27, 2020 3:28 pm
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PAP Mask: Bleep/DreamPort nasal mask
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Replace your mask pressure graph with your Flow Limitation graph please.

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DeltaBravo3.8
Unread post  Post subject: Re: What makes pressure increase?  |  Posted: Fri Nov 27, 2020 3:35 pm
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Joined: Sat Jul 04, 2020 8:38 am
Posts: 459
Location: Waynesboro, Pennsylvania, USA
PAP Mask: F&P Vitera & Simplus, ResMed F20 N/P30i & old Amara View
PAP Machine: RT says I need NIV ResMed Astral 150 soon
Humidifier: not now
Pressure Setting: wait for NIV

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Looking at what's given, the flow rate trace seems to indicate flow limits are happening due to the flat topping of the inhale. Take a look at the Flow Limit segment, and see if there's lots of activity shown there. I'm thinking your pressure min. needs to go up to 6 and see what the results show. If you feel like showing a shot of FL feel free to do so. If it shows activity trace lines or similar at .25 or more, that is the threshold I use to suggest more pressure is required.

Try this if you would, OSCAR shot of a No zoom whole night, top to bottom of Event flags, Flow Rate, Pressure, Leak, Flow Limit. Squash each segment to be a bit shorter until all 5 fit in one shot. You can do that size change via a click/drag on the border line between chart segments. Use this as your normal shot view.

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Dave K9DWB 73s

https://www.sleepfiles.com/OSCAR
http://www.apneaboard.com/wiki/index.php/OSCAR_Help
http://www.apneaboard.com/wiki/index.php/OSCAR_Chart_Organization


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Powerhands
Unread post  Post subject: Re: What makes pressure increase?  |  Posted: Fri Nov 27, 2020 4:57 pm

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Does this help?


Attachments:
CPAP.png
CPAP.png [ 162.49 KiB | Viewed 410 times ]
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DeltaBravo3.8
Unread post  Post subject: Re: What makes pressure increase?  |  Posted: Fri Nov 27, 2020 5:46 pm
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Joined: Sat Jul 04, 2020 8:38 am
Posts: 459
Location: Waynesboro, Pennsylvania, USA
PAP Mask: F&P Vitera & Simplus, ResMed F20 N/P30i & old Amara View
PAP Machine: RT says I need NIV ResMed Astral 150 soon
Humidifier: not now
Pressure Setting: wait for NIV

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Seeing the whole night would be helpful, and as your EPR is 2 you may want to try EPR 3 and consider bumping pressure from 5 to 6, or at the least a partial step up to 5.4, 5.6.

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Dave K9DWB 73s

https://www.sleepfiles.com/OSCAR
http://www.apneaboard.com/wiki/index.php/OSCAR_Help
http://www.apneaboard.com/wiki/index.php/OSCAR_Chart_Organization


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Pugsy
Unread post  Post subject: Re: What makes pressure increase?  |  Posted: Fri Nov 27, 2020 7:01 pm
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PAP Mask: Bleep/DreamPort nasal mask
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You can see that the flow limitations caused the increase in pressure.
It's what was expected.

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I may have to rise but I refuse to shine.


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