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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.
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?
Gideon - Project Manager and Lead Tester for OSCAR - Open Source CPAP Analysis Reporter
(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?
(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?
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
Gideon - Project Manager and Lead Tester for OSCAR - Open Source CPAP Analysis Reporter
(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
11-22-2019, 10:49 AM (This post was last modified: 11-22-2019, 10:54 AM by ragtopcircus.)
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.
(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.
Gideon - Project Manager and Lead Tester for OSCAR - Open Source CPAP Analysis Reporter
(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?
