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

[Pressure] How auto-titrating works (general)
#1
Found this info in a devilbiss document just now. (excerpts from a 23 page pdf)

Hardware:
In order for an Autotitrating PAP to measure breathing patterns properly and detect abnormal events, flow and pressure must be communicated to the algorithm as a high-quality signal. The principle behind the use of pneumotachometers and flow sensors is that flow patterns indicate corresponding breathing patterns. Autotitrating PAPs also use a pressure transducer to deliver precise pressure levels.

Responding Events:
Breathing events that, when present, trigger a response to increase pressure and, when absent, trigger a response to decrease pressure.
Obstructive apneas – occur when patient airways close and breathing cannot occur
Hypopneas – occur when patient airways are partially closed and breathing is limited

Predictive Events:
Snoring and flow limitation are similar in that both may occur prior to obstructive apneas and/or hypopneas. All Autotitrating PAPs are proactively programmed to increase pressure in response to snores or flow limitations to prevent the occurrence of obstructive apneas and hypopneas. There is conflicting evidence as to which parameter allows the earliest response.

Non-Responding Events:
Breathing events that are identified and logged without triggering a pressure response. Most Autotitrating devices have two non-responding events in common:
Leaks – usually caused by mouth breathing or mask fit/seal leaks
Non-obstructive apneas – caused by a PAP-induced reduction in CO2

Non-Obstructive Apneas (NOAs)
[poster's note: also called Clear Airway]
Cause: Non-obstructive apneas may occur during OSA therapy if the PAP pressure reduces the normal carbon dioxide accumulation and degrades the CO2 stimulus response. NOAs also may be primary central apneas that cannot be properly defined by an Autotitrating device alone.
NOTE: Non-obstructive apneas in excess of 10 per hour could indicate primary central apneas, not NOAs or obstructive apneas, and clinical intervention may be required.

Post Reply Post Reply
#2
(03-18-2015, 12:31 PM)worn_out_in_lebanon Wrote: Found this info in a devilbiss document just now.  (excerpts from a 23 page pdf)

Hardware:
In order for an Autotitrating PAP to measure breathing patterns properly and detect abnormal events, flow and pressure must be communicated to the algorithm as a high-quality signal. The principle behind the use of pneumotachometers and flow sensors is that flow patterns indicate corresponding breathing patterns. Autotitrating PAPs also use a pressure transducer to deliver precise pressure levels.

Responding Events:
Breathing events that, when present, trigger a response to increase pressure and, when absent, trigger a response to decrease pressure.
 Obstructive apneas – occur when patient airways close and breathing cannot occur
 Hypopneas – occur when patient airways are partially closed and breathing is limited

Predictive Events:
Snoring and flow limitation are similar in that both may occur prior to obstructive apneas and/or hypopneas. All Autotitrating PAPs are proactively programmed to increase pressure in response to snores or flow limitations to prevent the occurrence of obstructive apneas and hypopneas. There is conflicting evidence as to which parameter allows the earliest response.

Non-Responding Events:
Breathing events that are identified and logged without triggering a pressure response. Most Autotitrating devices have two non-responding events in common:
 Leaks – usually caused by mouth breathing or mask fit/seal leaks
 Non-obstructive apneas – caused by a PAP-induced reduction in CO2

Non-Obstructive Apneas (NOAs)
[poster's note:  also called Clear Airway]
Cause: Non-obstructive apneas may occur during OSA therapy if the PAP pressure reduces the normal carbon dioxide accumulation and degrades the CO2 stimulus response. NOAs also may be primary central apneas that cannot be properly defined by an Autotitrating device alone.
NOTE: Non-obstructive apneas in excess of 10 per hour could indicate primary central apneas, not NOAs or obstructive apneas, and clinical intervention may be required.


Excellent info.  Thanks!
Post Reply Post Reply
#3
does anyone have a link to the entire document or any similar documents on ASV or titration
Post Reply Post Reply


#4
Did you try Google search?

http://www.resmed.com/assets/documents/t...ow_eng.pdf
PaulaO2
Apnea Board Moderator
www.ApneaBoard.com


Breathe deeply and count to zen.

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
#5
(05-11-2017, 08:10 PM)PaulaO2 Wrote: Did you try Google search?

http://www.resmed.com/assets/documents/t...ow_eng.pdf

i have the resmed docs

he mentioned another one 

headsmack
i almost always google
dont know why i didnt this time
Post Reply Post Reply
#6
Thanks This was very educational.
Post Reply Post Reply


#7
(05-12-2017, 04:19 PM)dreamchaser Wrote: Thanks This was very educational.

the philips document on titration was the most useful
Post Reply Post Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Dreamstation Auto - Auto Start Takes a While littlefatcat 8 194 06-17-2017, 01:47 AM
Last Post: Hydrangea
  What oximeter works with Sleepyhead? kderevan 8 250 06-11-2017, 08:26 PM
Last Post: sonicboom
  self titrating an ASV xxyzx 18 654 05-15-2017, 07:46 AM
Last Post: Sleeprider
  Hyperventilating in General sleepyguy99 5 247 04-24-2017, 08:21 AM
Last Post: Sleeprider
  why you are still tired even after your xpap works xxyzx 8 547 04-15-2017, 03:53 PM
Last Post: kwhenrykerr
  General Software Questions c2workout 7 353 04-08-2017, 08:11 PM
Last Post: Beej
  How long before therapy actually works ? BHappy 11 716 04-07-2017, 08:42 AM
Last Post: Cranberry Ray

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.