Remstar Auto vs Plus Motor Changing Speed

Malibu · Post by **Malibu** » Sat Mar 11, 2006 11:13 am

Hello all... I did a search for my question and didn't find any results so I will ask it here.

I just changed from a Remstar Plus (the least expensive insurance option) to a Remstar Auto w/Cflex.

The Remstar Plus motor speed stays constant when I breath and the Remstar Auto motor speed goes up and down when I breath. I DO NOT have C-Flex enables since my pressure is 8 and I can breath against that with no problem. I read in the specs that the Plus does not have leak compensation and the Auto does. My thoughts are when I breath it considers it a leak and adjusts the pressure accordingly which makes sense I think. The Plus doesn't have that feature thus maybe the constant motor speed whether I breath or I have a leak.

Does this make sense and do others have the same experience?

Thanks!!

Malibu

NightHawkeye · Post by **NightHawkeye** » Sat Mar 11, 2006 11:31 am

Malibu wrote:Does this make sense and do others have the same experience?

My Remstar Auto motor speed varies with my breathing also. I don't think it's necessarily leak related though, just the mechanism the designers chose for implementing constant pressure. When you inhale the machine has to supply more air (to inflate your lungs) in order to maintain a constant pressure, and when you exhale the machine has to provide much less air for the same pressure.

I have noted an oddity in the Remstar Auto's algorithm though. One time when my mouth popped open, although it correctly interpreted the extra leakage and compensated for it thereby preventing apneas, after I woke up and closed my mouth, I was breathing so lightly that the machine apparently couldn't detect my breathing and persisted pulsing the air in the same fashion it had been doing while my mouth was open. I finally had to reach over and turn it OFF to reset it. After I turned it back ON then, it worked just fine.

Regards,
Bill

john5757 · Post by **john5757** » Sat Mar 11, 2006 11:50 am

If you have the Remstar plus without the C-flex it may not have a pressure sensor to respose to pressure variations caused by volume changes during breathing. CPAP has blowers meaning high volume, low pressure and since the volume of air changes direction during breathing the CPAP motor has to vary the speed in order to keep the exact set pressure for the time. Some Bi-paps have valves that regulate pressure during breathing.

Goofproof · Post by **Goofproof** » Sat Mar 11, 2006 2:13 pm

The Remstar auto varies the motor speed the other does not. They are not the same and they don't work the same. Both of them are working correctly.

john5757 · Post by **john5757** » Sat Mar 11, 2006 3:26 pm

That right the fixed and the auto CPAP are not the same but we are talking the blower varying the RPM while we are breathing in and out at the same pressure level if I understand the first question correctly.

Goofproof · Post by **Goofproof** » Sat Mar 11, 2006 4:04 pm

That is what I said the way they varies pressure is different, the APAP varies the flow by changing the motor speed, the CPAP motor runs at the same speed and it varies pressure in other ways.

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Malibu · Post by **Malibu** » Sat Mar 11, 2006 6:11 pm

Yes, the blower on the Remstar Plus stays at a constant rpm when I breath and the Remstar Auto varies the rpm. Technically speaking breathing can be considered a leak however a normal one and the Remstar Auto is keeping the pressure constant by varying the motor. The Auto has leak compensation and the Plus does not so that is why I figured the more expensive unit was tracking and correcting the pressure. I use a Resmed Activa mask and with the Plus I can feel the bellows moving in and out when I breath but with the Auto unit I cannot so I assume the Auto unit is keeping the pressure pretty close to the same all the time. Both are good units but I can definitely see the more expensive unit being a benefit to accuracy.

Malibu

Goofproof · Post by **Goofproof** » Sat Mar 11, 2006 7:27 pm

The plus also compensates for the leaks too, it's just in a different way,
all CPAP's have to make up for the leaks. the leaks just can't exceed the ability of the machine to keep up, as in the Large Leak data.

I don't know how they do it, but I bet it's like the wastegate on a turbocharger, that either dumps the extra air back into the inlet or into the case. Never had one apart,__________Yet!

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CPAPopedia Keywords Contained In This Post (Click For Definition): CPAP

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CPAPopedia Keywords Contained In This Post (Click For Definition): CPAP

Machine	Mask

Machine	Mask

Remstar Auto vs Plus Motor Changing Speed

Remstar Auto vs Plus Motor Changing Speed

Re: Remstar Auto vs Plus Motor Changing Speed