Breath pattern question

[Sleeprider]

Here is an image of my Vauto chart showing the flow rate and mask pressure in zoom.  I have drawn a vertical line where the flow-rate crosses the zero flow to show the relationship of mask pressure to flow rate at that critical moment.  Can you attempt to do a similar chart and drawing for comparison?  Notice that the peak of mask pressure very closely coincides with the crossover, and mask pressure drops sharply into expiration. Your chart appears to have a peak at crossover, but IPAP pressure continues to where that blip in flow rate occurs. This suggests the respiratory anomaly is caused by a fault in the machine syncing EPAP.

[Rubicon]

Kinda seems like the total opposite of EPR when you think about it.

Yet, I'm wondering if in certain cases it might not be a bad idea.

Gotta think about it some more...

[Rubicon]

OTOH this could be the beginning of a major recall..

[David Clark]

I might should say that the breathing pattern doesn't look like that for the entire night. It does it pretty much every night that I've been checking since I noticed it but it doesn't do it for the entire night, however, it does do it more than just once a night. I can't tell there's anything "off" with the machine as far as delivering pressure but then again this is my first experience with pap so I don't really know what it 'should' feel like. The numbers seem to look pretty good so I guess it's doing something right.

[Rubicon]

...it seems to be providing pressure support during expiration and EPAP pressure during inspiration.  

I think inspiration is OK, in that PS is applied appropriately throughout   However, it doesn't turn off until about a third through expiration.  See box #1:

[Rubicon]

I think it may be related to force/speed of exhalation.  Put up a shot when it isn't doing it so that the downslope of inspiration can be eyeballed.

[David Clark]

I think this is close to what you were asking for...I hope. 

[Rubicon]

Yeah that's a great sample, but you still got that plateau on the pressure waveform and the echo (extra pulse) is even more pronounced.

I think you need to call up ResMed and tell them your PS is malfunctioning. They may ask for a copy of the file.

[Sleeprider]

That graph shows the same thing we were talking about before. If the line was vertical, then as you reach the I:E crossover, the machine is still providing IPAP pressure. When it cycles, we see that little blip in expiration, about the time the EPAP should be at its nadir.

[Sleeprider]

I was writing my reply when Rubicon posted. Your machine is malfunctioning. We can't fix it.