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[Equipment] Rapidly Cycling Bilevel Pressure
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PaytonA Offline
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Posts: 3,014
Joined: Dec 2013

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: H5i(distilled-top up)
CPAP Pressure: VAuto MinE14.0 MaxI 20.6 PS4.0
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Orange County,California

Post: #1
Rapidly Cycling Bilevel Pressure
This morning, I woke up to find my ResMed VPAP Auto 25, Which is operating in bi-level mode, cycling between my IPAP and EPAP very rapidly. The cycle was taking about 1 second. I tried slowing my breathing to see if it would sense it and even tried holding my breath. It just maintained its rapid cycling and also did not score an apnea. This is way faster than my Ti max which is set at 2.0.

Does anyone know what might be going on or what might be causing this?

Best Regards,

PaytonA
03-26-2014 10:50 AM
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robysue Online
Wiki Editor
Advisory Members

Posts: 1,236
Joined: Oct 2013

Machine: PR Dreamstation BiPAP Auto
Mask Type: Nasal pillows
Mask Make & Model: Swift FX
Humidifier: PR Dreamstation humidfier
CPAP Pressure: min EPAP = 4; max IPAP = 9;
CPAP Software: SleepyHead EncoreBasic EncorePro

Other Comments: Papping since September 2010

Sex: Female
Location: Buffalo, NY

Post: #2
RE: Rapidly Cycling Bilevel Pressure
Sounds to me like a call to the DME is in order.
03-26-2014 11:12 AM
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c0reDump Offline

Preferred Members-2

Posts: 157
Joined: Jan 2014

Machine: ResMed S9 AutoSet
Mask Type: Full face mask
Mask Make & Model: Quattro Air
Humidifier: H5i (distilled)
CPAP Pressure: APAP 9-17cmH2O
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: TX

Post: #3
RE: Rapidly Cycling Bilevel Pressure
I'd reboot (power off, wait 10 seconds, power on) in that situation -- should not have a 30-60 respiratory rate unless trying to force hyperventilation.
03-26-2014 07:55 PM
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justMongo Offline

Monitors

Posts: 3,853
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

Other Comments: μολὼν λαβέ

Sex: Male
Location: Калифорния

Post: #4
RE: Rapidly Cycling Bilevel Pressure
Ti max is the max time in IPAP.
Ti min, which is often of the order of 300 milliseconds, is the minimum time it stays in IPAP.

Your machine can trigger as fast as about 3.33 times per second.
It may be a defect in the machine.
It may be your breathing pattern.
It may be the sensitivity of the trigger or cycle which is are often defaulted to MED.

I find my VPAP, that I run in S mode (Spontaneous) double triggers during a portion of my sleep.
I can see in the flow data why is would trigger. A slight positive flow in the middle of expiration triggers it back to IPAP during expiration.
My resp rate is usually around 15 per minute.
During this double trigger, my resp rate is recorded as about 30 per minute.

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.
(This post was last modified: 03-26-2014 09:26 PM by justMongo.)
03-26-2014 08:45 PM
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PaytonA Offline
Wiki Editor
Monitors

Posts: 3,014
Joined: Dec 2013

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: H5i(distilled-top up)
CPAP Pressure: VAuto MinE14.0 MaxI 20.6 PS4.0
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Orange County,California

Post: #5
RE: Rapidly Cycling Bilevel Pressure
I am trying the Bill Gates Solution (Reboot!!!)
03-26-2014 08:47 PM
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justMongo Offline

Monitors

Posts: 3,853
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

Other Comments: μολὼν λαβέ

Sex: Male
Location: Калифорния

Post: #6
RE: Rapidly Cycling Bilevel Pressure
On power cycling, I prefer to pull the AC line cord, not the DC plug in the back of the machine.
The supply takes a while to drain the capacitors -- I have found 10 seconds too short.
More like minutes!

(Or pull the AC first, then the DC.)

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.
03-26-2014 09:24 PM
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PaytonA Offline
Wiki Editor
Monitors

Posts: 3,014
Joined: Dec 2013

Machine: ResMed S9 VPAP Auto
Mask Type: Full face mask
Mask Make & Model: Resmed Mirage Quattro
Humidifier: H5i(distilled-top up)
CPAP Pressure: VAuto MinE14.0 MaxI 20.6 PS4.0
CPAP Software: ResScan SleepyHead

Other Comments:

Sex: Male
Location: Orange County,California

Post: #7
RE: Rapidly Cycling Bilevel Pressure
(03-26-2014 09:24 PM)justMongo Wrote:  On power cycling, I prefer to pull the AC line cord, not the DC plug in the back of the machine.
The supply takes a while to drain the capacitors -- I have found 10 seconds too short.
More like minutes!

(Or pull the AC first, then the DC.)

My S8 apparently has the transformer internal to the machine. I did disconnect the power and left it that way for several hours. Last night-no problem. Thanks for the input on draining the capacitors. I will keep that in mind.

Best Regards,

PaytonA
03-27-2014 10:39 AM
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justMongo Offline

Monitors

Posts: 3,853
Joined: Sep 2013

Machine: ResMed VPAP Auto (S9)
Mask Type: Full face mask
Mask Make & Model: ResMed Mirage Quattro
Humidifier: ResMed H5i
CPAP Pressure: 18 IPAPmax - 11 EPAPmin, PS=5
CPAP Software: Other Software

Other Comments: μολὼν λαβέ

Sex: Male
Location: Калифорния

Post: #8
RE: Rapidly Cycling Bilevel Pressure
(03-27-2014 10:39 AM)PaytonA Wrote:  My S8 apparently has the transformer internal to the machine. I did disconnect the power and left it that way for several hours. Last night-no problem. Thanks for the input on draining the capacitors. I will keep that in mind.

Best Regards,

PaytonA

Ah,yes. I missed your machine in your profile.
The VPAP Auto 25 is indeed an S8, and the power supply is internal to the machine.

Your machine is the S8 version of my S9 VPAP Auto.

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.
03-27-2014 10:45 AM
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