IPAP/EPAP stats

jskinner · Post by **jskinner** » Tue Nov 28, 2006 3:28 pm

I've been looking at adding separate IPAP/EPAP pressure vr X graphs to EPA as requested. One thing has me confused. I would expect some of the event data to show up under IPAP and the other under EPAP and that the total would be both of them added together. However for secondsAtpressure at least if I add them up I get twice the amount of time. Strange. Here an example of some data (after processing)

Can I assume that the event data is not doubled up like the time data?

-James

PS Have I mentioned just how bad the Encore Pro database schema is inside. Honestly I wonder where they found these programmers...

sinkem · Post by **sinkem** » Tue Nov 28, 2006 3:50 pm

I would assume that the settings for IPAP and EPAP are running at the same time, and therefore they would be the same total amount of time. I have never thought about IPAP takeing more or less time than EPAP.

jskinner · Post by **jskinner** » Tue Nov 28, 2006 4:05 pm

sinkem wrote:I would assume that the settings for IPAP and EPAP are running at the same time, and therefore they would be the same total amount of time. I have never thought about IPAP takeing more or less time than EPAP.

These are not settings, they are the amount of time at a particular pressure. As you can see if you add these up the person slept for almost 15 hours. This is wrong since they only slept for half that. Clearly both include both inhale and exhale time and the result is twice as much as I would expect. My problem is now knowing weither the rest of the data (the event data) is only for the inhale and exhale. I expect it is but am surprised by the time results

sinkem · Post by **sinkem** » Tue Nov 28, 2006 4:11 pm

The data looks doubled. Say if there is a OA that lasts for 15-20 seconds. A few rounds of IPAP ans EPAP would be missed. So for your data, could it be 3 OA's at 9/11 and 1 OA at 10/12? I hope its not something like 2 OA's at 9/11, one OA at 9/12 and one OA at 10/11.

I wonder if thats why Encore Pro reports OA and H separately?

jskinner · Post by **jskinner** » Tue Nov 28, 2006 4:18 pm

sinkem wrote:I would assume that the settings for IPAP and EPAP are running at the same time, and therefore they would be the same total amount of time.

Actually the more that I think about it the more I think your right. Maybe the both should add up to the total time. I was thinking that it would only count time in an exhale or exhale separately.

sinkem · Post by **sinkem** » Tue Nov 28, 2006 4:19 pm

By settings I mean for a snapshot in time when the machine records the data. The machine will be "set" at a IPAP of this and a EPAP of that and an event of something did or did not happen at that second.

jskinner · Post by **jskinner** » Tue Nov 28, 2006 4:30 pm

sinkem wrote:By settings I mean for a snapshot in time when the machine records the data. The machine will be "set" at a IPAP of this and a EPAP of that and an event of something did or did not happen at that second.

Yep I think your right. I think I should just tally up the events and stop thinking so hard about it, I was trying to make it more complicated that it really is. I was a little dense since BiPAPS are so much more confusing at first than a standard PAP...