Question about Insp. Time
Following advice I changed the pressure from 16/12 to 16/13. I changed start ramp pressure from 8 to 9 because I felt I was not getting enough air during the start of ramp. The change to start ramp pressure helped. The DME changed the mask from F20 large to F20 medium on Thursday. The leaks are high but getting better.
My question has to do with Insp. Time. It is set to 2.0, I have noticed the pressure support dropping before I have finished breathing in. SleepyHead shows 95% insp. rate is 2.00.
Should I increase the Insp. Time, if so how much?
Again thank you for all the wonderful help provided.
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RE: Question about Insp. Time
You can adjust the Ti Min in the clinic menu. Try increasing it a little at a time until you feel comfortable. This increases the time you spend in IPAP mode.
RE: Question about Insp. Time
When I increase Ti Min does that shorten epep time?
RE: Question about Insp. Time
No it just increases the time in IPAP. If you wanted to shorten the EPAP time you would decrease the rise time setting.
03-18-2018, 08:21 AM
(This post was last modified: 03-18-2018, 08:23 AM by Sleeprider.)
RE: Question about Insp. Time
I use TiMax of 2.2. All you can do is give it a try and see if you find that more comfortable. Remember that TiMax only means the IPAP will be sustained that long unless you spontaneously cycle. If you start to exhale before that, the machine will cycle to EPAP. Your 'feeling' that the machine is turning off IPAP at 2.0 is correct. Just don't go overboard with the TiMax and increase in small increments. FYI, my 95% inspiration time is about 2.14 and max is 2.2. Median is generally less than 1.5. So my settings feel like a pretty good fit.
RE: Question about Insp. Time
Sorry I guess I got that backwards.
03-18-2018, 08:33 AM
(This post was last modified: 03-18-2018, 08:34 AM by Sleeprider.)
RE: Question about Insp. Time
(03-18-2018, 07:41 AM)Walla Walla Wrote: No it just increases the time in IPAP. If you wanted to shorten the EPAP time you would decrease the rise time setting.
Increasing TiMin has very little effect on most people. The default is something like 0.3 seconds and it rarely comes into play. A significant change in TiMin might be used for someone that chronically has very short inspiration time, to encourage more time and volume in inspiration. I have rarel seen TiMin altered for anyone on the forum.
Rise time is the time in milliseconds that it takes for the machine to trigger from EPAP to IPAP. Very short rise times are frequently used for people with restrictive lung disease (COPD) where longer exhale times are needed. That seems counter-intuitive, but by filling the lung faster with a short rise time, the idea is to allow more time in expiration. I may be wrong, but I think rise-time is only adjustable on the Philips units when BiFlex is disabled. So it's used for specialized needs, but as you note, not what we're trying to do in this thread.
03-18-2018, 08:56 AM
(This post was last modified: 03-18-2018, 08:58 AM by Walla Walla.)
RE: Question about Insp. Time
Your right about the Philips and rise time when the Biflex is disabled. It does work in Auto Bipap though, unlike the VAUTO.
But it doesn't matter here with a ResMed fixed pressure Bpap.
RE: Question about Insp. Time
Default rise time is 300 ms. I think I have read that with COPD a shorter rise time is recommended to decrease rise time, leaving more time for exhale.
RE: Question about Insp. Time
Thanks. I will increase slowly/ Tonight I will go to 2.2
Gerry
