archangle wrote:avi123 wrote:Mark, just wanted to illustrate this which I mentioned above. It's possible that you have already fixed it:
S9 Autoset in APAP mode. No need for the lower Pressure trace. It's just confusing:
I disagree. The lower pressure trace is useful. Also, on some machines, such as bilevel autos, the pressure difference may change. It will also change with ramp for some people.
I'm with Archangle on this one. The lower pressure trace is useful. If we were going to have only one, I'd vote for the minimum, as with the S9's algorithm, that's the one that's more likely to determine whether or not air goes in your lungs when you try to breathe.
IIRC, in one of the earlier versions of SH there was a way to put mask pressure on the same graph as the min and max. I keep the mask pressure graph turned off these days since I almost never use it, but looking at the three pressure traces together was very instructive. It really drove home how most of the time my machine stays near Pressure-EPR, and only gets to Pressure for a moment at the end of most breaths. The maximum pressure has nothing to do with whether or not I can breathe, as if I can't get the breath started, the S9 stays at the minimum until I gasp and then starts ramping up the range so that doesn't happen again. You can see the same thing looking at the mask pressure trace alone, of course, but it wasn't until I saw it hugging the min line that I realized what the mask pressure data really meant. You've got plenty of other things to do now, but someday it would be nice to have that combined graph back, at least as an option.
