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Inspiration and Expiration Time
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10-27-2023, 04:11 PM
Insp.Time vs. Exp.Time (Ratio)
Quick Question. I have searched the board and have a simple question. What is a good Insp.Time vs. Exp.Time (Ratio) with CPAP therapy? Just trying to get an idea.
10-27-2023, 04:25 PM
RE: Insp.Time vs. Exp.Time (Ratio)
According to Google:
Inverse Ratio Ventilation - StatPearls - NCBI Bookshelf National Institutes of Health (.gov) Apr 6, 2023 Quote:A typical I:E ratio for most situations would be 1:2. If we apply this ratio to the patient above, the 6-second breath cycle will break down to 2 seconds of inspiration and 4 seconds of expiration. Changing the I:E ratio to 1:3 will result in 1.5 seconds of inspiration and 4.5 seconds of expiration. - Red
Crimson Nape
Apnea Board Moderator www.ApneaBoard.com ___________________________________ Useful Links -or- When All Else Fails: The Guide to Understanding OSCAR OSCAR Chart Organization Attaching Images and Files on Apnea Board Apnea Helpful Tips 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.
10-27-2023, 05:10 PM
RE: Insp.Time vs. Exp.Time (Ratio)
10-27-2023, 05:21 PM
RE: Insp.Time vs. Exp.Time (Ratio)
I just checked my averages for last night, and it equates to 1:1.63.
- Red
Crimson Nape
Apnea Board Moderator www.ApneaBoard.com ___________________________________ Useful Links -or- When All Else Fails: The Guide to Understanding OSCAR OSCAR Chart Organization Attaching Images and Files on Apnea Board Apnea Helpful Tips 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.
10-27-2023, 05:42 PM
RE: Insp.Time vs. Exp.Time (Ratio)
10-28-2023, 05:39 AM
RE: Insp.Time vs. Exp.Time (Ratio)
I am more like 1:1,1 no matter the settings on my CPAP. Don't feel like having an issue with a stable respiratory rate of between 13-15 (measurements by smart watch). My therapy is not working well yet, waiting for BiPAP to solve flow limitations (my AHI has always been < 1).
Interesting question I wanted to ask as well. Following.
10-28-2023, 09:06 AM
RE: Insp.Time vs. Exp.Time (Ratio)
You cannot necessarily rely on the Oscar reported inspiratory and expiratory median times. These are actually reported by the machine in question and is invariably inaccurate in all Philips machines and may be inaccurate in Resmed devices, especially where expiratory flow approaches zero and/or in the presence of cardiogenic oscillation. I often ask members for zoomed images of the flow rate so I can confirm or refute the reported statistics. Most of the time in healthy individuals, the respiratory ratio falls into a normal range from 1:1 to 1:3, and I have observed the majority of I:E ratios are close to one to 1.5. Inspiration time that is confirmed to be longer than expiration time is normally attributable to flow limitation, and abnormally long expiration is often asthma or COPD.
Historic trivia: Originally Sleepyhead displayed an I:E ratio, but it was incorrectly calculated as Texpiration/Tinspirationx100 and produced a number like 65.0, which was off by a factor of 100, meaning inspiration was .65 the time of expiration. It was decided back in February 2019 that Oscar should not report the I:E ratio due to the inaccurate reporting of inspiration and expiration times by the machines, general confusion on the part of Oscar users and the fact the legacy calculation was simply wrong. Ultimately, Oscar is a "Reporter" of information provided by the devices and today, Oscar does not report the I:E ratio for this reason, and it has not been reported since Sleepyhead 1.1.0. Here is a legacy image of Sleepyhead:
Sleeprider
Apnea Board Moderator www.ApneaBoard.com ____________________________________________ Download OSCAR Software Soft Cervical Collar Optimizing Therapy Organize your OSCAR Charts Attaching Files Mask Primer How To Deal With Equipment Supplier 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.
11-19-2023, 05:19 PM
Inspiration and Expiration Time
Sorry for all the questions, but reading and looking at others OSCAR data in past posts, what is ideal inspiration and expiratory times.
For example, I have seen some charts where inspiration time is something like 2.3s and expiratory time is 1.2s. Then others, like mine, where inspiration time is 1.3s and expiratory time is 2.1s or something like that. Does it matter? Do the machines get this correct? Thanks for all this board does!
11-19-2023, 05:41 PM
RE: Inspiration and Expiration Time
This seems to be an OK web site, and there's information there:
https://respelearning.scot/topic-1-anato...-breathing Keep in mind that the machine counts the pause between breaths as exhalation time. When I used a ResMed Airsense 10 Autoset, I got weird ratios of inhalation to exhalation (inhalation longer than exhalation). With the VAuto, all is well. It seems that the Airsense 10 got confused by the cardioballistic artifacts that show up as little oscillations between breaths on my flow rate graphs. For whatever reason, the VAuto isn't confused by the CB artifacts. |
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