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Your chart suggests some pretty shallow breathing and it appears there is flow restriction. I'd like to vertically stretch the flow rate and change the Y-axis. Right click the margin near the label until the context menu appears. Select Y-axis and Override th+e auto scale, then set the minimum to -100 and maximum to +100. Also select Dotted Line at zero. That will make the flow rate really pop. I think that procedure is described in the Organizing your OSCAR Chart wiki. A taller chart with a scale from -100 to +100 and dotted line will make interpretation much easier.
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.
05-15-2020, 01:23 AM (This post was last modified: 05-15-2020, 01:26 AM by heelbruise.)
RE: Does BiPAP have unintended side-effects?
(05-13-2020, 08:22 AM)Sleeprider Wrote: Your chart suggests some pretty shallow breathing and it appears there is flow restriction. I'd like to vertically stretch the flow rate and change the Y-axis. Right click the margin near the label until the context menu appears. Select Y-axis and Override th+e auto scale, then set the minimum to -100 and maximum to +100. Also select Dotted Line at zero. That will make the flow rate really pop. I think that procedure is described in the Organizing your OSCAR Chart wiki. A taller chart with a scale from -100 to +100 and dotted line will make interpretation much easier.
Got it, here it is. Any thoughts?
By the way, I also included another image of a night that was before I limited my pressure range and before I did max EPR. You previously asked for this. I forgot that OSCAR saves a lot of data! So that's why there are two images.
The Jan 9 is the old one.
The May 11 is the same night we have been looking at but now with the enhanced view of flow rate.
(05-13-2020, 05:59 AM)bonjour Wrote: Pressure Support is simply the difference between Exhale and Inhale pressures.
There is a continuum of Obstructive events from apnea to hypopnea to flow limitations to normal. ResMed uses flow limitations as a precursor to apnea and hypopneas and as such raises pressure to head off apnea and hypopneas. The flow limits chart indicates the flatness of the flow rate chart which indicates flow limitations.
Ahh that makes sense.
By the way, thank you for the work you've done on OSCAR. You're literally saving lives.
Your zoomed image at 01:59 on May 11 shows a shallow breathing with a serrated peak that may be snoring. At 01:59:35 there are several recovery breaths or arousal that more than double the previous flow, followed by additional shallow breaths, then another larger amplitude flow. The bumps seen during expiration are from your pulse (the heart normally transmits pressure to the lungs). We can see the variable flow rate but this does not help us identify a reason for the phenomenon, but we can assume this was disruptive to sleep. This is not what we would identify as flow-limitation because there is a defined peak to inspiration that is not flattened. The pressure during this sequence is 9.6/6.6, and pressure through the night varies by less than 2-cm which suggests you are near an optimum for the Autoset.
Good job with formatting. You can now see the zero-flow crossover and inspiration and expiration times clearly.
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.