Flow Restriction

[ginzo]

Good Morning everyone!!

So I set up sleepy head to monitor 20% and 50% (quite a while back) flow restriction per one of our savvy members suggestion.

Now for the hard part, What am I looking for to be a good "target" in those graphs as a min/med/95% average?

I have searched but can not find any guidelines.

Chuck

[justMongo]

Good morning Ginzo.

I don't know why you're targeting FL. The real goal of FL is zero. Which for most of us in not possible.

AFAIK: there is no "good "target" in those graphs as a min/med/95% average."

[DariaVader]

Flow Limitation seems to be a different measurement than Flow Restriction, although I am not too knowledgeable about the difference - I note that the values are not the same in my charts. Also not clear on which is the greater FR - 20 or 50... I know I have a lot of 50s, and seldom any 20s but logic says that a 50% flow restriction is a greater restriction than 20% (unless it *illogically* means that you are restricted *to* 20%.... ) It would be great to hear some educated information on FR vs FL

[justMongo]

Ah, you two are using SleepyHead. So, is not FR whatever JediMark defined it as?
FL is a scoring of the inhalation waveform's top flattening on an arbitrary 0 to 1 scale.
I think FR is the decrease in high rate flow magnitude averaged over X cycles.
ergo, 50% would be worse than 20% -- I am assuming.

[ginzo]

So, am I to assume (ass/u/me) that maybe, Jm's restriction (20%-50%) might be another scale of FL? As in 20% or 50% of the time?

I understand the FL is resistance vs. pressure. But still not clear on restriction. AND my mistake, it is not in my graphs, but in my overview page. I have the tick marks showing in my overlays on the graphs.


Am I just an idiot, or are we still trying to decipher what JM's intentions are? I can't find any patterns with any other graphs to tell what/where/why they occur.

Flow Limitation seems to be a different measurement than Flow Restriction, although I am not too knowledgeable about the difference - I note that the values are not the same in my charts. Also not clear on which is the greater FR - 20 or 50... I know I have a lot of 50s, and seldom any 20s but logic says that a 50% flow restriction is a greater restriction than 20% (unless it *illogically* means that you are restricted *to* 20%.... ) It would be great to hear some educated information on FR vs FL

[pholynyk]

I will have to look at a chart that has both 50% and 20% flags, but I think that FR20 means flow Restricted /to/ 20%, rather than flow restricted _by_ 20%. Probably time I looked at the last few days anyway... It should be obvious in comparison.
And it is obvious... The UF1 is the 20%, and is almost flat, the UF2 is 50% and is bumpy with flow.

[attachment=2035]

[DariaVader]

I will have to look at a chart that has both 50% and 20% flags, but I think that FR20 means flow Restricted /to/ 20%, rather than flow restricted _by_ 20%. Probably time I looked at the last few days anyway... It should be obvious in comparison.
And it is obvious... The UF1 is the 20%, and is almost flat, the UF2 is 50% and is bumpy with flow.

That was my suspicion also, but it seemed -- counter-intuitive (better word than illogical )

[justMongo]

So, am I to assume (ass/u/me) that maybe, Jm's restriction (20%-50%) might be another scale of FL? As in 20% or 50% of the time?

I understand the FL is resistance vs. pressure. But still not clear on restriction. AND my mistake, it is not in my graphs, but in my overview page. I have the tick marks showing in my overlays on the graphs.


Am I just an idiot, or are we still trying to decipher what JM's intentions are? I can't find any patterns with any other graphs to tell what/where/why they occur.

No you are not an idiot. This is abstruse stuff.
FL as defined by ResMed is a measure of the shape of the inhalation waveform.
I think FR is a measure of reduction in flow amplitude.

The two may overlap.

[ginzo]

So now that I look at it closer, per pholynyks' chart. I brought my chart in to a closer view, I didn't pay attention to the exact time frame.

It looks to me as 20% is worse than 50% as the flow is almost nil @ 20% and the wave form still has some shape at 50%.

That being said, I would assume (ass/u/me) that this tells me you're going to stop breathing and the machine gives you a kick start? All my other readings drop off in those time frames although they tend to be in the 10 second range on average.

That's my take on it, any rebuttals?

I will have to look at a chart that has both 50% and 20% flags, but I think that FR20 means flow Restricted /to/ 20%, rather than flow restricted _by_ 20%. Probably time I looked at the last few days anyway... It should be obvious in comparison.
And it is obvious... The UF1 is the 20%, and is almost flat, the UF2 is 50% and is bumpy with flow.

Thanks Mongo, I'm just trying to figure it all out and then offer up some help to others when I can. It looks as if you have nailed it.

BTW, I had to look up abstruse. Google is a wonderful tool! That will be the word of the day!!!

So, am I to assume (ass/u/me) that maybe, Jm's restriction (20%-50%) might be another scale of FL? As in 20% or 50% of the time?

I understand the FL is resistance vs. pressure. But still not clear on restriction. AND my mistake, it is not in my graphs, but in my overview page. I have the tick marks showing in my overlays on the graphs.


Am I just an idiot, or are we still trying to decipher what JM's intentions are? I can't find any patterns with any other graphs to tell what/where/why they occur.

No you are not an idiot. This is abstruse stuff.
FL as defined by ResMed is a measure of the shape of the inhalation waveform.
I think FR is a measure of reduction in flow amplitude.

The two may overlap.