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Pressure pulses
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pupcamper Offline

Advisory Members

Posts: 400
Joined: Nov 2015

Machine: PR DreamStation CPAP Pro
Mask Type: Nasal pillows
Mask Make & Model: AirFit P10 Pillows; Quatro Air FFM
Humidifier: DreamStation Heated Humidifier
CPAP Pressure: 10.5 cmH2O; no ramp; no C-Flex
CPAP Software: SleepyHead EncorePro

Other Comments: Lung cancer survivor since 11/2004; CPAP since 11/2015

Sex: Male
Location: Van Buren, Arkansas, USA.

Post: #1
Pressure pulses
I have been seeing pressure pulses in my waveform data. What are they?

"....respiration,—a troublesome practice, but one which custom has rendered necessary to our easy existence...." Oliver Twist, Charles Dickens- 1837

I use FlashPAP to load data from a FlashAir III wifi sd card in my machine to my computer and display it with SleepyHead .
robysue's Beginner's Guide to SleepyHead
01-28-2016 09:07 PM
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OpalRose Offline

Monitors

Posts: 3,178
Joined: Nov 2014

Machine: PR System One REMstar Auto 560 with A Flex
Mask Type: Nasal pillows
Mask Make & Model: AirFit P10 For Her
Humidifier: REMStar heated humidifier with heated hose
CPAP Pressure: Auto Cpap 10-13 AFLEX 1
CPAP Software: SleepyHead EncoreBasic

Other Comments: Started CPAP Therapy October 23, 2014

Sex: Female
Location: Northeast Ohio, USA

Post: #2
RE: Pressure pulses
The PR machines send out pressure pulses to test whether the airway is open or obstructed.
From my understanding, it then flags the event based on that determination.

OpalRose
(This post was last modified: 01-28-2016 09:37 PM by OpalRose.)
01-28-2016 09:37 PM
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zonk Offline

Advisory Members

Posts: 7,908
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: #3
RE: Pressure pulses
Whenever apnea is detected, the machine uses small pressure pulses to determine whether apnea is obstructive or central
01-28-2016 09:39 PM
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Jimsp1 Online

Preferred Members

Posts: 83
Joined: Oct 2015

Machine: DreamStation Auto
Mask Type: Nasal mask
Mask Make & Model: DreamWear
Humidifier: DreamStation
CPAP Pressure: 7-10
CPAP Software: SleepyHead EncorePro

Other Comments:

Sex: Male
Location:

Post: #4
RE: Pressure pulses
From the help section of DreamMapper

An apnea is detected when there is an 80% reduction in airflow from a baseline for at least 10 seconds if there is no airflow detected for 10 seconds. During the apnea, one or more pressure test pulses are delivered by the device. The device evaluates the response of the patient to the test pulse(s) and assesses whether the apnea has occurred while the patient has a clear airway or an obstructed airway. The airway is determined to be clear if the pressure test pulse generates a significant amount of flow; otherwise the airway is determined to be obstructed. When the airway is clear then a Clear Airway Apnea event is recorded.
01-28-2016 09:49 PM
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pupcamper Offline

Advisory Members

Posts: 400
Joined: Nov 2015

Machine: PR DreamStation CPAP Pro
Mask Type: Nasal pillows
Mask Make & Model: AirFit P10 Pillows; Quatro Air FFM
Humidifier: DreamStation Heated Humidifier
CPAP Pressure: 10.5 cmH2O; no ramp; no C-Flex
CPAP Software: SleepyHead EncorePro

Other Comments: Lung cancer survivor since 11/2004; CPAP since 11/2015

Sex: Male
Location: Van Buren, Arkansas, USA.

Post: #5
RE: Pressure pulses
That makes sense. They occur mostly around apnea events, but I have seen some in sections of the waveform in which no events were recorded. In those cases I did notice that the pulses were at the end of a wave form that looked a lot like an apnea event, only shorter.

Thanks for your quick responses.

"....respiration,—a troublesome practice, but one which custom has rendered necessary to our easy existence...." Oliver Twist, Charles Dickens- 1837

I use FlashPAP to load data from a FlashAir III wifi sd card in my machine to my computer and display it with SleepyHead .
robysue's Beginner's Guide to SleepyHead
01-28-2016 10:04 PM
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AshSF Offline

Advisory Members

Posts: 356
Joined: Oct 2014

Machine: PRS1 D560TS
Mask Type: Nasal pillows
Mask Make & Model: ResMed P10, Bkup: Airfit F10 & Quattro Air
Humidifier: PRS1 60 series with Heated Tube
CPAP Pressure: 8 - 8 w/ Aflex 3
CPAP Software: SleepyHead

Other Comments: Using APAP mode with fixed pressure

Sex: Male
Location:

Post: #6
RE: Pressure pulses
You are probably confusing the hunt-n-peck generated pressure changes used by Philips respironics machines (go up about 1.5cm pressure in 2 minutes and come back down to original pressure in next 2 minutes). These are not 'pressure pulses'. Those can not be seen on pressure graph because they are less than a second in duration and can only be seen as tick marks on the event graph.

Started APAP 4-20, Closed range to 7.5-14, then straight 8.0 w/ Aflex 3
RDI always below 1. But sleep much much better at straight pressure.
Started on F10, Tried Quattro Air successfully. Finally settled on P10.
01-29-2016 04:32 AM
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