Hello Guest, Welcome to Apnea Board !
As a guest, you are limited to certain areas of the board and there are some features you can't use.
To post a message, you must create a free account using a valid email address.

or Create an Account


New Posts   Today's Posts

Flow Rate Readings
#1
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?
Post Reply Post Reply






Donate to Apnea Board  
#2
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
Post Reply Post Reply
#3
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 ~
Post Reply Post Reply
#4
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.
Post Reply Post Reply






Donate to Apnea Board  
#5
RE: Flow Rate Readings
Here's the image. What I'm talking about happens at about 5:25am

https://imageshack.us/i/pnpkyYBYp
Post Reply Post Reply
#6
RE: Flow Rate Readings
I think ajack is right. Your breathing looks normal.
Download SleepyHead
Organize your Sleepyhead Charts
Posting Charts
Beginner's Guide to SleepyHead
Mask Primer
5
Advisory Members serve as an "Advisory Committee" to help shape Apnea Board's rules & policies.

Membership in the Advisory Members group does not imply medical expertise or qualification for advising Sleep Apnea patients concerning their treatment.



Post Reply Post Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Flow Limits, RERAs and CA events RadarRalfs 6 224 04-14-2021, 05:27 PM
Last Post: Gideon
  Question About Flow Limitations upsman 4 210 04-05-2021, 12:17 PM
Last Post: RadarRalfs
  ASV for flow limitations in mild OSA logit 14 471 04-04-2021, 04:42 PM
Last Post: sheepless
  [split] Amerikiwi1 - elevated respiratory rate Amerikiwi1 14 548 04-01-2021, 01:25 PM
Last Post: Sleeprider
  Love a follow up on my OSCAR readings plz! Captain Howdy 19 532 03-30-2021, 07:52 PM
Last Post: Captain Howdy
Sad [CPAP] Wake up snoring despite low AHI, low leak rate etc regitimate 17 531 03-30-2021, 09:27 AM
Last Post: Gideon
  Random periods of elevated respiratory rate budor 31 906 03-22-2021, 06:16 PM
Last Post: Sleeprider


New Posts   Today's Posts






About Apnea Board

Apnea Board is an educational web site designed to empower Sleep Apnea patients.