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From: "Wim Vogelaar" <wim.vogelaar at mc2world dot on 4 Nov 2005 08:31
I have a question. A person asked me advise about using an APAP. The person
used the ResMed APAP for one night. Just to try. There were almost no
apnea/hypopnea events. Only very low at the bottom of the graph a blue line
for some hours. However, the pressure was for almost the whole night about
9 cm. How should that pressure be interpreted? As an indication that the
APAP is desirable to be used? Or to address the point from another side.
What is the pressure of an average person that is not having AP and/or AHI
events when that person would use an APAP? When the airway is large enough
(as assumed to be the case for most people) in terms of capacity, what is
then the pressure you can expect? Is that e.g. 4 cm?



Thanks in advance for your answer.



Wim Vogelaar, http://home.wanadoo.nl/w.h.vogelaar/marfan/apnea/


From: Quick on 4 Nov 2005 12:54
Wim Vogelaar wrote:
> I have a question. A person asked me advise about using
> an APAP. The person used the ResMed APAP for one night.
> Just to try. There were almost no apnea/hypopnea events.
> Only very low at the bottom of the graph a blue line for
> some hours. However, the pressure was for almost the
> whole night about 9 cm. How should that pressure be
> interpreted? As an indication that the APAP is desirable
> to be used? Or to address the point from another side.
> What is the pressure of an average person that is not
> having AP and/or AHI events when that person would use an
> APAP? When the airway is large enough (as assumed to be
> the case for most people) in terms of capacity, what is
> then the pressure you can expect? Is that e.g. 4 cm?

ummm, I think we're missing a lot of information here.

Does the person think they have OSA? Why?
Did this person have a sleep study?

What was the machine set at? Min? Max?

That machine has a minimum settable pressure of 4 cm.
Assuming the minimum is set to 4 cm and a person doesn't
have OSA the machine will produce 4 cm. It can't produce
less.

Why would the machine run "about" 9 cm all night? Who
knows? I have no idea what the machine's possible behavior
would be for people who are not compatible with an APAP.
It's possible an APAP won't work for this person (assuming
they have OSA).

Did this person have a sleep study?

-Quick


From: eric pearson on 4 Nov 2005 22:45
More missing info:
Which APAP?
Which mask?
Leaks?
Some APAP respond well with any mask. Some (Sullivan/Resmed is known
for this) depend upon the mask having a narrow range of flow
characteristics which must be identified to the APAP. Different APAPs
respond differently to leaks. Among the reactions are over-increase of
pressure and delayed increase/decrease of pressure. YMMV.

On Fri, 04 Nov 2005 17:54:23 GMT, "Quick"
<quick7135-news(a)NOSPAMyahoo.com> wrote:

>Wim Vogelaar wrote:
>> I have a question. A person asked me advise about using
>> an APAP. The person used the ResMed APAP for one night.
>> Just to try. There were almost no apnea/hypopnea events.
>> Only very low at the bottom of the graph a blue line for
>> some hours. However, the pressure was for almost the
>> whole night about 9 cm. How should that pressure be
>> interpreted? As an indication that the APAP is desirable
>> to be used? Or to address the point from another side.
>> What is the pressure of an average person that is not
>> having AP and/or AHI events when that person would use an
>> APAP? When the airway is large enough (as assumed to be
>> the case for most people) in terms of capacity, what is
>> then the pressure you can expect? Is that e.g. 4 cm?
>
>ummm, I think we're missing a lot of information here.
>
>Does the person think they have OSA? Why?
>Did this person have a sleep study?
>
>What was the machine set at? Min? Max?
>
>That machine has a minimum settable pressure of 4 cm.
>Assuming the minimum is set to 4 cm and a person doesn't
>have OSA the machine will produce 4 cm. It can't produce
>less.
>
>Why would the machine run "about" 9 cm all night? Who
>knows? I have no idea what the machine's possible behavior
>would be for people who are not compatible with an APAP.
>It's possible an APAP won't work for this person (assuming
>they have OSA).
>
>Did this person have a sleep study?
>
>-Quick
>

regards,
eric pearson
nonono.ericp1.nonono(a)nonono.fuse.net
From: "Wim Vogelaar" <wim.vogelaar at mc2world dot on 5 Nov 2005 04:48
Here follows the information the patient has mailed me:



http://home.wanadoo.nl/w.h.vogelaar/marfan/apnea/abc/abc20051104.txt

This is the CSV file that was exported in the ResMed AutoScan software.

See for export command:
http://home.wanadoo.nl/w.h.vogelaar/marfan/apnea/totals.htm



http://home.wanadoo.nl/w.h.vogelaar/marfan/apnea/abc/abc20051104.PNG shows
the graphs.

Don't forget to click on the square button at the right lower side of the
picture to make the picture more readable.

That is because the picture is PNG.



Machine used is the ResMed S8 Vantage.
See: http://www.cpap.net/manufacturers_cpaps/resmed/s8autosetvantage.htm

Min pressure 4 cm, max pressure 20 cm.

Mask used : ResMed Ultra Mirage FFM.



The patient is doing in fact just an experiment. It is a self done sleep
study.

But with the same equipment and software as doctors could use.



Wim Vogelaar, http://home.wanadoo.nl/w.h.vogelaar/marfan/apnea/




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