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
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
#2
you forgot to put the zoomed chart in, it may be a bit of mouth breathing with the nasal mask.
new user http://www.apneaboard.com/wiki/index.php...re_success
mask fit http://www.apneaboard.com/wiki/index.php...ask_Primer
From machine or sleepyhead, set the min CPAP 1cm below median pressure. Or 2cm below 90/95%. max at 20cm for now. Forum will help you fine tune settings
Post Reply Post Reply
#3
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.)
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


#4
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.
Post Reply Post Reply
#5
Here's the image. What I'm talking about happens at about 5:25am

https://imageshack.us/i/pnpkyYBYp
Post Reply Post Reply
#6
I think ajack is right. Your breathing looks normal.
Post Reply Post Reply




Possibly Related Threads...
Thread Author Replies Views Last Post
  Trying to gt ahi and leak rate under control sirto 14 480 08-20-2017, 08:28 AM
Last Post: Sleeprider
  Leak Rate Threshold pcplus2 3 114 08-18-2017, 03:35 PM
Last Post: silversnore
  Help with leak rate nosleeptilbklyn 7 215 08-14-2017, 04:49 AM
Last Post: 2SleepBetta
  how do you rate it? looking for fitting mask christian4870 2 130 08-13-2017, 04:10 AM
Last Post: christian4870
  Leak Rate Advise ThrownOutTheAsylum 10 481 08-09-2017, 06:55 AM
Last Post: DeepBreathing
Question Impact of flow limits? CTcentrals 5 210 08-07-2017, 01:05 AM
Last Post: CTcentrals
  Flow Limitation - can you explain? christian4870 15 629 08-06-2017, 06:06 PM
Last Post: Sleepster

Forum Jump:

New Posts   Today's Posts




About Apnea Board

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

For any more information, please use our contact form.