Different pressure with Different masks

lawdognellie · Post by **lawdognellie** » Thu Aug 24, 2006 2:14 pm

I have been using the HC406 mask, but the othernight I wore my swift. I noticed that the presure blowing into my nose felt MUCH stronger when I wore the swift than when I wear other masks. This leads me to wonder if whether different masks need different pressures, and if so, what if you want to use a different mask than the one where you had the titration study done?

Sarah

Goofproof · Post by **Goofproof** » Thu Aug 24, 2006 2:38 pm

The machine should make up for the different built in leak rates, (wash out CO2), It can dot make up for leaks that are bigger than it's specs, IE, mouthleaks, or interface sealing poorly. Jim

me woozle · Post by **me woozle** » Thu Aug 24, 2006 2:55 pm

when using the swift ' it 'feels' like the pressure is stronger, but it's not, it's just concentrated right into your nasal passages - I have found that for a full face mask, I do need a bit higher pressure than what I use for the swift
good luck!

krousseau · Post by **krousseau** » Thu Aug 24, 2006 3:15 pm

I know what I'm trying to get across in this explanation but don't know enough about aerodynamics to get the right terms. So there is someone out there who can explain it better. When the airflow from the blower goes from the large bore tubing into the smaller diameter nasal pillows it would give a higher pressure to the airstream. When the air is delivered to the mask first it is released to a larger area-and the pressure drops. (same thing happens with a garden hose if you use a jet nozzle to wash the driveway or a bubbler to flood plants). The xPAP blowers have to "compensate" so that the correct pressure reaches your airway-some do it automatically and some have to be set for the "leak rate" of your mask/interface.

Guest · Post by **Guest** » Thu Aug 24, 2006 6:37 pm

[quote="krousseau"]I know what I'm trying to get across in this explanation but don't know enough about aerodynamics to get the right terms. So there is someone out there who can explain it better. When the airflow from the blower goes from the large bore tubing into the smaller diameter nasal pillows it would give a higher pressure to the airstream. When the air is delivered to the mask first it is released to a larger area-and the pressure drops. (same thing happens with a garden hose if you use a jet nozzle to wash the driveway or a bubbler to flood plants). The xPAP blowers have to "compensate" so that the correct pressure reaches your airway-some do it automatically and some have to be set for the "leak rate" of your mask/interface.

krousseau · Post by **krousseau** » Thu Aug 24, 2006 11:17 pm

The Hybrid is very good-I just lost a detailed account of my experience so I'm going to write it up in Word tomorrow-and will paste it into a post.