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OSCAR and/or ResMed related question
#1
OSCAR and/or ResMed related question
)Hi Guys,

Following another post (Different AHI results between two CPAP machines) I defined a user event flag as 50% flow restriction and 10 seconds duration. This is also ResMed definition of an Hypopnea.

Surprisingly, OSCAR detected 5 such events while ResMed detected two Hypopneas at different time. See attached screenshots. UF1 definitely looks as an Hypo to me.

"Corrected" AHI will be 2 instead of 1 for this case.

Please let me know what you think.

Thanks,
Arik


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#2
RE: OSCAR and/or ResMed related question
And what is the basis for a normal breath? 50% is the border between flow limitations and hypopneas. Most of the breaths in your closeup view appear to be either shallow or flow limited. What does your normal flow look like?
Fred Bonjour - Project Manager and Lead Tester for OSCAR - Open Source CPAP Analysis Reporter 
OSCAR

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#3
RE: OSCAR and/or ResMed related question
(11-22-2019, 08:53 AM)bonjour Wrote: And what is the basis for a normal breath? 50% is the border between flow limitations and hypopneas.  Most of the breaths in your closeup view appear to be either shallow or flow limited.  What does your normal flow look like?

Hi Fred,

The attached is a typical "good" one. I noticed that even at nights with very low AHI, I still have a lot of flow limitations. Can I do something about that?

BTW, OSCAR is a GREAT application!

Thanks,
Arik
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#4
RE: OSCAR and/or ResMed related question
(11-22-2019, 09:22 AM)Arik Wrote:
(11-22-2019, 08:53 AM)bonjour Wrote: And what is the basis for a normal breath? 50% is the border between flow limitations and hypopneas.  Most of the breaths in your closeup view appear to be either shallow or flow limited.  What does your normal flow look like?

Hi Fred,

The attached is a typical "good" one. I noticed that even at nights with very low AHI, I still have a lot of flow limitations. Can I do something about that?

BTW, OSCAR is a GREAT application!

Thanks,
Arik
Forgot the attachment...


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#5
RE: OSCAR and/or ResMed related question
You have maxed out your pressure support by having EPR=3. I would set your min pressure to 7 as that will maximize your benefit at low pressures. That means your min pressures IPAP/EPAP = 7/4
Fred Bonjour - Project Manager and Lead Tester for OSCAR - Open Source CPAP Analysis Reporter 
OSCAR

Download OSCAR
New to Apnea? Helpful tips to ensure success
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Mask Primer
Dealing with a DME
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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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#6
RE: OSCAR and/or ResMed related question
(11-22-2019, 09:38 AM)bonjour Wrote: You have maxed out your pressure support by having EPR=3. I would set your min pressure to 7 as that will maximize your benefit at low pressures. That means your min pressures IPAP/EPAP = 7/4

Not sure I understand. Did you mean max pressure = 7?
Thanks,
Arik
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#7
RE: OSCAR and/or ResMed related question
(11-22-2019, 10:37 AM)Arik Wrote:
(11-22-2019, 09:38 AM)bonjour Wrote: You have maxed out your pressure support by having EPR=3. I would set your min pressure to 7 as that will maximize your benefit at low pressures. That means your min pressures IPAP/EPAP = 7/4

Not sure I understand. Did you mean max pressure = 7?
Thanks,
Arik
Your minimum pressure (IPAP) is 5. IPAP - EPR = EPAP. However, Resmed machines will never reduce the pressure below 4. So, at you minimum pressure of 5, EPR is effectively reduced to 1 (until apnea causes your pressure to rise).

However, the default minimum IPAP of 4 is too low for almost everyone except in pediatric use. Your minimum of 5 is still pretty low. As an adult, it is unlikely that you will need less than 7. Increasing your minimum pressure to 7 will leave enough room to allow EPR to function at the full requested 3 cmH2O.
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#8
RE: OSCAR and/or ResMed related question
(11-22-2019, 10:49 AM)ragtopcircus Wrote:
(11-22-2019, 10:37 AM)Arik Wrote:
(11-22-2019, 09:38 AM)bonjour Wrote: You have maxed out your pressure support by having EPR=3. I would set your min pressure to 7 as that will maximize your benefit at low pressures. That means your min pressures IPAP/EPAP = 7/4

Not sure I understand. Did you mean max pressure = 7?
Thanks,
Arik
Your minimum pressure (IPAP) is 5. IPAP - EPR = EPAP. However, Resmed machines will never reduce the pressure below 4. So, at you minimum pressure of 5, EPR is effectively reduced to 1 (until apnea causes your pressure to rise).

However, the default minimum IPAP of 4 is too low for almost everyone except in pediatric use. As an adult, it is unlikely that you will need less than 7. Increasing your minimum pressure to 7 will leave enough room to allow EPR to function at the full requested 3 cmH2O.

Exactly.
Fred Bonjour - Project Manager and Lead Tester for OSCAR - Open Source CPAP Analysis Reporter 
OSCAR

Download OSCAR
New to Apnea? Helpful tips to ensure success
Soft Cervical Collar
Mask Primer
Dealing with a DME
Organize Charts
Attaching Charts

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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#9
RE: OSCAR and/or ResMed related question
(11-22-2019, 10:52 AM)bonjour Wrote:
(11-22-2019, 10:49 AM)ragtopcircus Wrote:
(11-22-2019, 10:37 AM)Arik Wrote: Not sure I understand. Did you mean max pressure = 7?
Thanks,
Arik
Your minimum pressure (IPAP) is 5. IPAP - EPR = EPAP. However, Resmed machines will never reduce the pressure below 4. So, at you minimum pressure of 5, EPR is effectively reduced to 1 (until apnea causes your pressure to rise).

However, the default minimum IPAP of 4 is too low for almost everyone except in pediatric use. As an adult, it is unlikely that you will need less than 7. Increasing your minimum pressure to 7 will leave enough room to allow EPR to function at the full requested 3 cmH2O.

Exactly.
I see. Does this suppose to improve Flow Limitation?
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#10
RE: OSCAR and/or ResMed related question
EPR = 3 and min pressure = 7 should lessen flow limitation and hypopneas, so yes, improve flow limitations.
Fred Bonjour - Project Manager and Lead Tester for OSCAR - Open Source CPAP Analysis Reporter 
OSCAR

Download OSCAR
New to Apnea? Helpful tips to ensure success
Soft Cervical Collar
Mask Primer
Dealing with a DME
Organize Charts
Attaching Charts

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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