How do I size a Quattro full face?

[jerryinpa]

The sizing guide doesn't recommend this mask for me, but a couple of members here with thin, deep nasal bridges do.... so what the heck, I'll try to get one on the auction and if it doesn't work, I'll just sell it back to someone....

The problem is that the sizing guide won't tell me a size for a Quattro since it doesn't recommend it for me.

So how do I size it?

I'm new at this, so the only other mask I have is a Ultra Mirage 2 and it's a Large.

Any suggestions?

Thanks in advance,

Jerry.

[desmondwl]

Go to myresmed.com. Look for Full Face Masks, select Mirage Quattro. This brings up a .pdf file that you can print and cut out a templete to help you find the size you need.

[ozij]

Have just read your first post, desmond.
Thanks for joining, posting and supporting!

O.

[sososleepy]

I didn't know these templates were available on the resmed site. I definitly have the wrong size quattro. Ireally can't wear it much cause it is to small.
I just downloaded the template and as i suspected the small is the wrong size. I used the sizing chart on the cpap store site and i quess i didn't measure correctly. Looks like i'm a medium, almost a large. I would definitly use the templates as it was much easier and for me, more accurate. Thanks for posting this info desmondwl. Sososleepy

[Snoredog]

the most critcal dimension on a full face mask is the vertical dimension, that is measuring in a mirror using a ruler and finding the vertical dimension from the center of the pupils of the eye down to the center of the chin below the lower lip.

Once you know that dimension, say it is 3-3/4", that would fall under a med-large mask. Since it is a Full Face mask that you are looking at, the possibility of the lower jaw dropping is high (reason you are considering a FF mask), therefor if you are to fudge on size, you are better off fudging on the larger size (i.e. Large vs Medium). If the mask you have chosen is too large the cushion will ride lower on the chin, this means as your jaw drops the cushion will land in the indention of the chin.
If you have chosen a mask that is too small, when your jaw drops the cushion will land into the open mouth and result in a very large leak.

Since FF masks are expensive, it is wise to know your own vertical dimension then ask what the mask measures from top to bottom. If you want the best chance of a sealing mask, the top will always ride right between your eyes (equal to center of the pupils of the eye, reason you measure from there).

The problem with most FF masks in maintaining a seal is the moving mandible, that is very difficult to overcome. If you use a chin strap they become confining and can even pull the mandible back into the TMJ joint, this can result in a narrower airway (opposite of what you want).

My experience with online sizing guides is they are mediocre at best, they cannot beat knowing your vertical dimension and measuring the cushion. You measure the cushion by finding the "center" of the membrane at the top to the "center" of the membrane at the bottom. That cushion dimension should fall closely to your found vertical dimension.

The mouth should be closed (naturally relaxed when closed) when that vertical dimension is taken.

The width of the mouth really has no bearing, but the cushion you choose should have a width dimension which falls outside the horizontal dimension with mouth closed (measuring corner to corner).

If you have a extra long snozola like woody woodpecker you may run into problems with your nose bottoming out when over tightening on the straps. Get the vertical dimension correct and that should not be a problem.

[mindy]

Thanks very much, Snoredog! That's the best description I've seen for sizing a FFM.

Mindy

[jsmythe]

[quote="Snoredog"]the most critcal dimension on a full face mask is the vertical dimension, that is measuring in a mirror using a ruler and finding the vertical dimension from the center of the pupils of the eye down to the center of the chin below the lower lip.

Once you know that dimension, say it is 3-3/4", that would fall under a med-large mask. Since it is a Full Face mask that you are looking at, the possibility of the lower jaw dropping is high (reason you are considering a FF mask), therefor if you are to fudge on size, you are better off fudging on the larger size (i.e. Large vs Medium). If the mask you have chosen is too large the cushion will ride lower on the chin, this means as your jaw drops the cushion will land in the indention of the chin.
If you have chosen a mask that is too small, when your jaw drops the cushion will land into the open mouth and result in a very large leak.

Since FF masks are expensive, it is wise to know your own vertical dimension then ask what the mask measures from top to bottom. If you want the best chance of a sealing mask, the top will always ride right between your eyes (equal to center of the pupils of the eye, reason you measure from there).

The problem with most FF masks in maintaining a seal is the moving mandible, that is very difficult to overcome. If you use a chin strap they become confining and can even pull the mandible back into the TMJ joint, this can result in a narrower airway (opposite of what you want).

My experience with online sizing guides is they are mediocre at best, they cannot beat knowing your vertical dimension and measuring the cushion. You measure the cushion by finding the "center" of the membrane at the top to the "center" of the membrane at the bottom. That cushion dimension should fall closely to your found vertical dimension.

The mouth should be closed (naturally relaxed when closed) when that vertical dimension is taken.

The width of the mouth really has no bearing, but the cushion you choose should have a width dimension which falls outside the horizontal dimension with mouth closed (measuring corner to corner).

If you have a extra long snozola like woody woodpecker you may run into problems with your nose bottoming out when over tightening on the straps. Get the vertical dimension correct and that should not be a problem.