CPAPtalk.com

WEK wrote:tidal volume of 700mL

And the doctor prescribed 700ml because you are 10 feet tall? The 700ml should be stretching your lungs a bit. I don't blame you if it hurts!!

StillAnotherGuess wrote:

WEK wrote:tidal volume of 700mL

And the doctor prescribed 700ml because you are 10 feet tall? The 700ml should be stretching your lungs a bit. I don't blame you if it hurts!!

So, you're saying that it should be something less than 700mL? My 10 day average is ~650mL. Maybe that's why I wake up at 4am with a terrible pain between my shoulder blades.

What should it be? Is it based on the person's size/weight, or something else? At any rate, I will be discussing this with my doctor on Friday.

WEK wrote:Maybe that's why I wake up at 4am with a terrible pain between my shoulder blades.

Maybe your lungs are somewhere between your shoulder blades?

WEK wrote:What should it be? Is it based on the person's size/weight, or something else?

Tidal Volume is based on height, only. There is a Respironics AVAPS recommended protocol for Tidal Volume (Tv). Unless you are really tall, you should be cranking down your Tv from 700mil to somewhere between 520mil and 620mil (max) in accordance with your height and the AVAPS protocol. Your average Tv of 650mil is scary. You should stop using AVAPS until you consult a knowledgeable specialist with your complaint of pain. The pain should hopefully subside in a few days when you stop using the device at 700mil. What is your height in feet and inches? AVAPS is not for amateurs. Not even amateur doctors. Worst case scenario is that AVAPS, at an improper Tv, can (easily) distend your lungs, or kill you.

StillAnotherGuess wrote:Tidal Volume is based on height, only.

That is not entirely correct. The AVAPS protocol is based on weight. That said, it uses ideal weight, where Ideal Body Mass Index is assumed to be 23 Kg/m2 (BMI=weight/height2).

TS2, that is only considered to be a starting point. Therapy is geared towards regulation of pCO2, and as noted from the data previously presented, the OP's does not need to be regulated.

StillAnotherGuess wrote:And the doctor prescribed 700ml because you are 10 feet tall?

Actually, depending on how you use the protocol, he could be from ~5'8" to 6'5".

Hey WEK,
I think you should change the name of your thread to the machine you are actually using. Just so I understand...they titrated you with an AVAPS but issued you an ASV?

Settings and options on those machines are different...
Jamis

jamiswolf wrote:Hey WEK,
I think you should change the name of your thread to the machine you are actually using. Just so I understand...they titrated you with an AVAPS but issued you an ASV?

Settings and options on those machines are different...

I'm questioning this as well. Many machines will provide info on tidal volume, but that doesn't mean they have AVAPS.

As I indicated initially, I'm new to this whole thing and do not understand all of the terminology. So bear with me as I learn.

According to my sleep study report, I "underwent an AVAPS titration study". My prescription was for given "for AVAPS with maximum IPAP pressure of 30, minimum IPAP pressure of 21, EPAP of 17 and tidal volume of 700mL, with rise time of 3 and ramp time of 0."

My machine was provided by the VA and shipped to, setup and delivered by a local DME (the VA is a 5 hour drive for me).

I just rechecked and I have the Phillips Respironics System One BiPAP AVAPS, C-Series (Phillips part number 1061418). I have updated my profile.

Sorry for the confusion.

WEK wrote:As I indicated initially, I'm new to this whole thing and do not understand all of the terminology. So bear with me as I learn.

According to my sleep study report, I "underwent an AVAPS titration study". My prescription was for given "for AVAPS with maximum IPAP pressure of 30, minimum IPAP pressure of 21, EPAP of 17 and tidal volume of 700mL, with rise time of 3 and ramp time of 0."

My machine was provided by the VA and shipped to, setup and delivered by a local DME (the VA is a 5 hour drive for me).

I just rechecked and I have the Phillips Respironics System One BiPAP AVAPS, C-Series (Phillips part number 1061418). I have updated my profile.

Sorry for the confusion.

No worries, WEK. This IS confusing at first and you are definitely using one of the more unusual therapies here.

DeltaDave is one of the smartest people here and I'm hoping he can help you understand all this.

deltadave wrote:

StillAnotherGuess wrote:And the doctor prescribed 700ml because you are 10 feet tall?

Actually, depending on how you use the protocol, he could be from ~5'8" to 6'5".

But, still wouldn"t necessarily necessitate having the doctor prescribe too the high end of the protocol. I'm assuming the doctor's number was arbitrary, at best.