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Hypopnea
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robanco Offline

Members

Posts: 7
Joined: Aug 2015

Machine: resmed autoset 10
Mask Type: Full face mask
Mask Make & Model: resmed fx
Humidifier: resmed airset 10
CPAP Pressure: 6-17
CPAP Software: SleepyHead

Other Comments: Retired Accountant

Sex: Male
Location: Sydney, Australia

Post: #1
Hypopnea
I am using a Resmed Airset 10 on Auto, 6 to 17. I am having trouble understanding the Hypopnea readings. Regardless of what the rate is the duration is always 10 seconds but when I did my sleep study the maximum H duration was 103 seconds. Is this a wrinkle with my m/c or should i accept the readings
Dont-knowDont-know
08-31-2015 04:59 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: #2
RE: Hypopnea
From an article published by the NIH: "Hypopnea is defined as reduction in ventilation of at least 50% that results in a decrease in arterial saturation of 4% or more due to partial airway obstruction." http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3507119/

During the sleep study, I would guess you were not under positive pressure -- a hypo lasting 103 seconds is certainly possible.

Now, you are on at least 6 cm-H2O pressure -- or more from the autoset. The minimum event duration the machine can score is 10 seconds. Look at your high rate flow waveform for the 10 seconds before the flag -- the amplitude will show a decrease. What is your flow limitation graph doing at that time? Is the hypo causing the autoset to increase pressure? All of this can be gleaned from sleepyhead.

Rate and duration are independent.

What is your AHI for a night's sleep; and what part is Hypo? How do you feel on your autoset?

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(This post was last modified: 08-31-2015 05:20 PM by justMongo.)
08-31-2015 05:18 PM
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