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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.
That's interesting and thank you for the reply. I noticed the same with my last machine the Dreamstation 2 and now the Aircurve.
I:E times are not consistent between machines. Philips almost always shows inspiration time longer than expiration time. Ignore it as it is not a metric reported by the machine. Resmed is generally correct, but can be fooled by a rapid return from exhale to a near-zero flow which gets counted as inspiration time. Don't trust anything without looking at the flow chart in close zoom to verify.
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.
That makes me feel better. I have a ResMed Autosense 10 and my insp is always larger than my exp albeit very slightly. Prob just an error if flow limits and AHI is all good, I’d guess.
Right, don't worry about it. If you want to reassure yourself, you can always zoom in and see for yourself roughly what the ratio actually is breath by breath.
Ok thanks. I zoomed in and looked and it was like +27 to -37 on the few I looked at. Is that what I’m supposed to look at it or am I counting seconds on each change in wave?
For the ratio, you want to look at the length of an exhalation and the length of an inhalation. Count the time between breaths (on the zero line) as part of exhalation.
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.
Awesome, thanks. I finally understand this graph now. I have a ResMed but the data it shows for me has always been a longer inspiration vs expiration in the statistics section.
