RS may have stepped away, so I will attempt to translate the chart, if that's OK.squid13 wrote:robysue I must be having a senor moment cause this chart confuses me. Is that 8 below equals EPAP,below equals 14 and 10, below equals IPAP below equals 16robysue wrote:It may help to consider a few examples: Let's say that we have Min EPE = 8 and MAX IPAP = 16. Now lets consider what happens with different PS levels:
With PS = 2, we have the following ranges 8 <= EPAP <= 14 and 10 <= IPAP <= 16
With PS = 3, we have the following ranges 8 <= EPAP <= 13 and 11 <= IPAP <= 16
With PS = 4, we have the following ranges 8 <= EPAP <= 12 and 12 <= IPAP <= 16
With PS = 5, we have the following ranges 8 <= EPAP <= 11 and 13 <= IPAP <= 16
With PS = 6, we have the following ranges 8 <= EPAP <= 10 and 14 <= IPAP <= 16
I believe her point was to show the effect of changing the PS in a ResMed autobilevel in which the Min EPAP setting remains at 8 and the Max IPAP setting remains at 16. With that maximum and minimum set, the PS affects the ranges in which actual delivered IPAP and actual delivered EPAP vary thoughout the night, and does so as follows in centimeters of H2O pressure:
If PS is set to 2, EPAP can vary from 8 to 14 and IPAP can vary from 10 to 16.
If PS is set to 3, EPAP can vary from 8 to 13 and IPAP can vary from 11 to 16.
If PS is set to 4, EPAP can vary from 8 to 12 and IPAP can vary from 12 to 16.
And so on.
So IPAP gets a range to vary in, and EPAP gets a range to vary in, but at any given moment, IPAP will always be exactly above EPAP the precise amount that the PS is set to.
So if PS is set to 4, that means that when EPAP is at 8, IPAP will be at 12; when EPAP is at 8.5, IPAP will be at 12.5; when EPAP is at 9, IPAP will be at 13; and so on.
I hope that helps more than confuses.
All of the above applies to ResMed autobilevels only.