Re: ResMed S9 and AHI 0.0 - Look Bob no hands!
Posted: Tue Mar 16, 2010 3:53 pm
Dave, thanks for posting your graphs. I printed them out, then taped them together, so they all lined up on one page. Then I drew pencil lines from the points where your Pressure went up, up and down the page. If you're clever with computer graphics, I'm sure you could do this more accurately.
Anyway, this is the pattern I saw, which leads to more questions. I know there's no way of knowing, but I'm wondering if this is what could have happened--or please tell me if I'm totally off base.
At approx. 23:15, the pressure went from 10 to 12.2. The Leak at that moment was low, but the Flow Limitation dipped to the mid-point of the graph--so the pressure increase seemed to be in response to the Flow Limitation. And since there are no apneas or hypopneas, this was effective.
There was a slight increase in snore at that same moment, but still in the low range. I'm wondering if you happened to roll over onto your back, which initiated the snore? And maybe this small the snore was enough to cause the Flow Limitation?
The Minute Ventilation was steady, but went up soon after the pressure went up, as did the Flow. And this is because the pressure increased, took care of the flow limitation, so normal breathing resumed? Seems to be a good argument for using apap mode.
At the other points where Pressure increased, there was a similar pattern. Fascinating stuff. What do you, or others think?
Anyway, this is the pattern I saw, which leads to more questions. I know there's no way of knowing, but I'm wondering if this is what could have happened--or please tell me if I'm totally off base.
At approx. 23:15, the pressure went from 10 to 12.2. The Leak at that moment was low, but the Flow Limitation dipped to the mid-point of the graph--so the pressure increase seemed to be in response to the Flow Limitation. And since there are no apneas or hypopneas, this was effective.
There was a slight increase in snore at that same moment, but still in the low range. I'm wondering if you happened to roll over onto your back, which initiated the snore? And maybe this small the snore was enough to cause the Flow Limitation?
The Minute Ventilation was steady, but went up soon after the pressure went up, as did the Flow. And this is because the pressure increased, took care of the flow limitation, so normal breathing resumed? Seems to be a good argument for using apap mode.
At the other points where Pressure increased, there was a similar pattern. Fascinating stuff. What do you, or others think?