(06-22-2013, 08:27 PM)spdklls99 Wrote: For me...I need a higher "in Pressure" or Ipap....that is exactly what PS min is..the Ipap OR (Epap + Ps min = IPAP.. higher pressure for inhale to stop centrals) the ps min is just a starting point for your Asv..it will start at that pressure but increase as needed for a breath ...all the way up to Ps max or max pressure if need be..
still waiting for my machine..sigh..this Bipap St the Dr prescribed has just NOT come close to doing the job since day 1.
ResMed literature says a PS of 10 will usually provide adequate ventilation for a person during a full central event, as long as he/she has normal lungs (meaning, without lung disease).
I think it very strange that your Dr kept your PS set so low on your BiPAP S/T machine when he knew or should have known your centrals were not being adequately treated. A fixed PS of 4 is not nearly enough to treat full centrals.
You might want to consider increasing your PS by 1 cmH2O per day while you wait for your ASV machine, until your PS reaches 7 or even higher if not uncomfortable. I think this would help prepare you for the higher PS which the ASV machine will sometimes be using and, more importantly, would better treat your central apneas while you are waiting for your new machine.
On a separate note, ASV machines will react to sudden cessations in breathing but will not react to gradual reductions in breathing which can slowly lead to hypopnea and arousal. Raising my PS min to 6 has nearly eliminated five or ten minute episodes of gradual reduction in breathing ending in arousals, which used to be shown often in my sleep data, but every so often these episodes are still occurring. On my S9 VPAP Adapt, 6 is the highest the PSmin can be set, and I think I would do better with a PSmin of 7. This is why I wish I had gotten the PRS1 BiPAP autoSV Advanced.
But I suggest you start with PS min set to 4 like your present prescription. By looking at the data after a couple weeks, you will be able to see if there is any reason the PS min should be raised.
EPAP + PS = IPAP
EPAPmin + PSmin = IPAPmin
The IPAP might get as high as EPAPmax + PSmax, unless the IPAP is limited to a lower value by the Max Pressure setting.