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How Does CPAP Machine Work?
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thecpapshop Offline

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Posts: 6
Joined: Oct 2012

Machine: none
Mask Type: Not using mask
Mask Make & Model: unsure
Humidifier: unsure
CPAP Pressure: unsure
CPAP Software: Not using software

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Sex: Undisclosed
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Post: #11
RE: How Does CPAP Machine Work?
Essentially, Gene is correct. However, I will put another spin on it. The machine is designed to sense flow resistance. The greater the flow resistance, the more pressure provided by the CPAP in order to keep the airway open. Of course, this is with an automatic machine. I fixed pressure machine maintains positive constant pressure throughout its cycle. An auto machine checks resistance on a breath to breath basis and evaluates the flow or resistance rate.
Sticking with the auto example, once an apnea begins, a CPAP senses the flow rate and increases the pressure until the apnea is eliminated. This cycle continues at every breath in order to fully eliminate each apnea event throughout the night. When there is no apnea event, the machine cycles down to the base pressure.
10-25-2012 03:35 PM
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JJJ Offline

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Posts: 751
Joined: Apr 2012

Machine: ResMed S9 Autoset
Mask Type: Nasal mask
Mask Make & Model: Most recent: Wisp, Pilairo, Mirage Vista
Humidifier: ResMed S9 Autoset
CPAP Pressure: 17-20
CPAP Software: SleepyHead

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Sex: Male
Location: USA 97217

Post: #12
RE: How Does CPAP Machine Work?
(10-25-2012 03:35 PM)thecpapshop Wrote:  Essentially, Gene is correct. However, I will put another spin on it. The machine is designed to sense flow resistance. The greater the flow resistance, the more pressure provided by the CPAP in order to keep the airway open. Of course, this is with an automatic machine. I fixed pressure machine maintains positive constant pressure throughout its cycle. An auto machine checks resistance on a breath to breath basis and evaluates the flow or resistance rate.
Sticking with the auto example, once an apnea begins, a CPAP senses the flow rate and increases the pressure until the apnea is eliminated. This cycle continues at every breath in order to fully eliminate each apnea event throughout the night. When there is no apnea event, the machine cycles down to the base pressure.

This is correct, but there is still a problem. My machine (for example), even though it is on automatic setting, does not react fast enough. My doc initially prescribed the lower pressure at 5 cm, but over the past several months I have slowly raised it to 8 cm. And I'm thinking about raising the lower limit a bit more. Thus, when an apnea or hypopnea occurs, the machine doesn't have so far to go in order to supply enough pressure.
10-25-2012 04:07 PM
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zonk Offline

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Posts: 7,947
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: Integrated /ClimateLineAir
CPAP Pressure: 9/13
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #13
RE: How Does CPAP Machine Work?
(10-25-2012 03:35 PM)thecpapshop Wrote:  Sticking with the auto example, once an apnea begins, a CPAP senses the flow rate and increases the pressure until the apnea is eliminated. This cycle continues at every breath in order to fully eliminate each apnea event throughout the night.
aiming for zero AHI every single night is unrealistic and impossible task. the aim is to prevent collapse of the airways but cannot prevent every single collapse. if the S9 autoset detect the airways are open .. no pressure increase.
10-25-2012 04:34 PM
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genes Offline

Preferred Members-2

Posts: 59
Joined: Sep 2012

Machine: Respronics Auto Cpap
Mask Type: Nasal mask
Mask Make & Model:
Humidifier: Respronics
CPAP Pressure: 17 -20
CPAP Software: EncorePro

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Sex: Male
Location:

Post: #14
RE: How Does CPAP Machine Work?
More information about how a cpap works.
http://patents.com/us-20120227738.html
GeneS
11-04-2012 10:27 PM
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SuperSleeper Offline

Administrators

Posts: 10,088
Joined: Feb 2012

Machine: PR System One REMstar Auto (DS560)
Mask Type: Nasal pillows
Mask Make & Model: ResMed Mirage Swift II
Humidifier: none
CPAP Pressure: 12.5 - 18.5 cmH20 (auto range)
CPAP Software: SleepyHead

Other Comments: Have diabetes Type II

Sex: Male
Location: Illinois, USA

Post: #15
RE: How Does CPAP Machine Work?
(11-04-2012 10:27 PM)genes Wrote:  More information about how a cpap works.
http://patents.com/us-20120227738.html
GeneS

Cool.... thanks!

Coffee

SuperSleeper
Apnea Board Administrator
www.ApneaBoard.com


INFORMATION ON APNEA BOARD FORUMS OR ON APNEABOARD.COM SHOULD NOT BE CONSIDERED AS MEDICAL ADVICE. ALWAYS SEEK THE ADVICE OF A PHYSICIAN BEFORE SEEKING TREATMENT FOR MEDICAL CONDITIONS, INCLUDING SLEEP APNEA. INFORMATION POSTED ON THE APNEA BOARD WEB SITE AND FORUMS ARE PERSONAL OPINION ONLY AND NOT NECESSARILY A STATEMENT OF FACT.

11-05-2012 08:09 AM
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zimlich Offline

Preferred Members-2

Posts: 392
Joined: Feb 2012

Machine: Respironics PR System One BiPap Auto SV Advanced
Mask Type: Nasal mask
Mask Make & Model: ResMed gel Nasal Mask
Humidifier: System One
CPAP Pressure: 8-20 ASV, 8 EPAP,PS 12
CPAP Software: Not using software

Other Comments: I use the Quattro FFM when necessary

Sex: Female
Location: Norfolk, VA

Post: #16
RE: How Does CPAP Machine Work?
Just google "how do cpap machines work". Wickipedia has a great explanation.
Good luck,
Mary
11-05-2012 09:20 AM
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BobF Offline

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Posts: 99
Joined: Aug 2012

Machine: ResMed Airsense 10
Mask Type: Full face mask
Mask Make & Model: Respironics Blue Gel Full Face Large
Humidifier: Built in
CPAP Pressure: 12.8
CPAP Software: ResScan

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Sex: Male
Location: So. CA.

Post: #17
RE: How Does CPAP Machine Work?
Hi. OK. Thanks. Very good info. Regards, Bob.
11-05-2012 11:01 AM
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