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Flow Rate Readings
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08-06-2017, 04:12 AM
Flow Rate Readings
I'm looking at my SH charts and I see some areas where the flow rate indicator becomes much thinner. Hovering over those areas I find that the figures go into the minus figures, the lowest on last nights readings was -25. I'm not sure what this means. There is a slight increase in leak rate but nothing else stands out. The pressure is reasonably constant and there are no events during this time. Is this something I should look at, is it an indicator of breathing issues?
RE: Flow Rate Readings
you forgot to put the zoomed chart in, it may be a bit of mouth breathing with the nasal mask.
mask fit http://www.apneaboard.com/wiki/index.php...ask_Primer
For auto-cpap, from machine data or software. You can set the min pressure 1 or 2cm below 95%. Or clinicians commonly use the maximum or 95% pressure for fixed pressure CPAP, this can also be used for min pressure. https://aasm.org/resources/practiceparam...rating.pdf
RE: Flow Rate Readings
Negative flow rate occurs on exhale.
(It really isn't negative because the flow generator is always pushing air down the tube. But, the machine finds a numerical average to call zero such that positive is inhale; and negative is exhale.) Admin Note:
JustMongo passed away in August 2017
Click HERE to read his Memorial Thread ~ Rest in Peace ~
08-06-2017, 06:59 AM
RE: Flow Rate Readings
If you right click on the left margin of the flow rate chart, you can select dotted lines, and add a zero line. The zero line is where inhale and exhale cross-over. Below the zero line is exhale and is expressed as negative mL and on the positive side is inhale. in the absence of leaks the total volume/time will be approximately equal. It is normal for time of exhale, including the null flow before inhale to take longer than the inspiration time.
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.
08-07-2017, 03:24 AM
RE: Flow Rate Readings
08-07-2017, 07:53 AM
RE: Flow Rate Readings
I think ajack is right. Your breathing looks normal.
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