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Resmed v Philips - Hypopneas
#1
Question 
I've been trialling a Resmed S9 Autoset, with indifferent results, so I've now been issued a Philips Respironic Bipap ASV. After the first two nights my OSA and CSA indices have fallen to almost nothing, but the hypopnea index has jumped from around 0.6 to >7. (Hence the AHI has remained between 7 and 9).

Is this dramatic increase in HI a function of the bipap ASV treatment, or is it a case of the machines interpreting the same data differently? Looking at the graphs, it seems the Philips is more aggressive in flagging an event than the Resmed was. I use SleepyHead software, if that makes any difference.

DeepBreathing
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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.
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#2
Or it could be you are having more hypopneas. Seems as though I read that somewhere as a side thing with ASV machines. That the variable pressure keeps the brain tricked to not have a central but at the cost of having more hypopneas. But don't take that as fact! I could be wrong.
PaulaO2
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INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.




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#3
The only way to reasonably determine the difference at home is to use both machines with a pulse oxymeter, and see if you get more O2 dips on the one than the other, and if they line up with the events listed in the machine readout in Sleepyhead.

Beyond that, I would seek out the opinion of your therapist.
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#4
(10-12-2013, 06:36 PM)DeepBreathing Wrote: I've been trialling a Resmed S9 Autoset, with indifferent results, so I've now been issued a Philips Respironic Bipap ASV. After the first two nights my OSA and CSA indices have fallen to almost nothing, but the hypopnea index has jumped from around 0.6 to >7. (Hence the AHI has remained between 7 and 9).

Is this dramatic increase in HI a function of the bipap ASV treatment, or is it a case of the machines interpreting the same data differently? Looking at the graphs, it seems the Philips is more aggressive in flagging an event than the Resmed was. I use SleepyHead software, if that makes any difference.

Hi DeepBreathing,

ResMed defines Hypopnea as 50% or greater decrease in air flow for ten seconds or longer

Philips Respironics defines hypopnea as a 40% reduction in flow for ten seconds or longer

But before I venture a comment, what are your machine's settings?

Max pressure [4 to 25.0]
EPAP min [4 to Max pres]
EPAP max [EPAP min to Max Pres]
PS min [0 to (Max Pres - Max EPAP)]
PS max [PS min to (Max Pres - Min EPAP)]
BPM [Off, Auto, 4 to 30]
Ti [0.5 to 3.0]
Flex type [None Bi-Flex]
Bi-Flex [1 2 3]
Rise time [0 1 2 3]

Take care,
--- Vaughn
Membership in the Advisory Member group should not be understood as in any way implying medical expertise or qualification for advising Sleep Apnea patients concerning their treatment. The Advisory Member group provides advice and suggestions to Apnea Board administrators and staff on matters concerning Apnea Board operation and administrative policies - not on matters concerning treatment for Sleep Apnea. I think it is now too late to change the name of the group but I think Voting Member group would perhaps have been a more descriptive name for the group.
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