Post Reply 
bi-level ST and the AVAPS machines
Author Message
robysue Offline
Wiki Editor
Advisory Members

Posts: 1,233
Joined: Oct 2013

Machine: PR Dreamstation BiPAP Auto
Mask Type: Nasal pillows
Mask Make & Model: Swift FX
Humidifier: PR Dreamstation humidfier
CPAP Pressure: min EPAP = 4; max IPAP = 9;
CPAP Software: SleepyHead EncoreBasic EncorePro

Other Comments: Papping since September 2010

Sex: Female
Location: Buffalo, NY

Post: #11
RE: bi-level ST and the AVAPS machines
(12-21-2013 09:02 PM)me50 Wrote:  Peter_C does BIPAP change pressure with every breath if it needs to? I ask because a tech told me that the BIPAP they used in my titration did that. I don't mean start an inhale.
A System One BiPAP Pro (model 660) has two fixed pressures: the IPAP and the EPAP. The pressure changes from IPAP to EPAP on every inhalation to exhalation transition. The pressure changes from EPAP to IPAP on every exhalation to inhalation transition.

A System One BiPAP Auto (model 760) has an auto algorithm that allows both the EPAP and the IPAP to change throughout the night in response to flow limitations, snoring, RERAs, Hs, and OAs. Exactly how those two pressures are allowed to vary during the night depends on the following settings:
    min EPAP
    max IPAP
    min PS
    max PS
In general, the actual EPAP and IPAP on any given breath cycle will satisfy:
    min EPAP <= EPAP <= max IPAP - min PS
    min EPAP + min PS <= IPAP <= max IPAP
    min PS <= IPAP - EPAP <= max PS
And on every breath cycle, the IPAP is used for the inhalations and the EPAP is used for the exhalations.


And yes, a System One BiPAP Auto can be quite useful in managing aerophagia problems in some patients. The switch to a System One BiPAP Auto running is a very, very tight Auto range is what finally brought my aerophagia issues under control.
(This post was last modified: 12-26-2013 12:53 PM by robysue.)
12-26-2013 12:50 PM
Find all posts by this user Post Reply Quote this message in a reply

Donate to Apnea Board
Post Reply 


Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Newbie so confused between 2 machines Matzaball2016 4 131 Today 12:56 AM
Last Post: chill
  Switching Machines owlgirl63 4 227 12-04-2016 05:11 AM
Last Post: kwhenrykerr
  Question: sound level on Resmed S9 WITHOUT humidifier, compared to Remstar 560 kowlooner 8 227 11-29-2016 10:51 AM
Last Post: kowlooner
  New User Problem with BiPAP AVAPS - Part 1 jmayer180 35 1,298 11-27-2016 09:50 AM
Last Post: jmayer180
Question Change Humidity Level Seasonally txpap 9 514 11-21-2016 06:58 PM
Last Post: Sleepster
Question CHANGING MACHINES - SD CARD srlevine1 3 234 10-31-2016 07:11 PM
Last Post: srlevine1
  Configuring an AVAPS jbsix 21 721 10-18-2016 09:00 AM
Last Post: Sleeprider

Forum Jump:

Who's Online (Complete List)