extremely low tidal volume
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- Posts: 49
- Joined: Tue Mar 12, 2019 12:01 am
extremely low tidal volume
I posted yesterday about my respiratory rate looking too high. Thanks everyone for the answers, the machine was definitely overestimating my respiratory rate. However, this led me to find another issue. In the areas of artificially high respiratory rate, my tidal volume dips down below 100, and minute ventilation drops below 5, sometimes even to 3.7. Does anyone understand what's going on here???
I previously was diagnosed with epiglottic collapse and had surgery to partially excise the epiglottis. I'm starting to wonder if this is still a manifestation of an epiglottis problem. The strange thing is, the machine does not pick up any flow limit during these times...
Please see the below graphs.
I previously was diagnosed with epiglottic collapse and had surgery to partially excise the epiglottis. I'm starting to wonder if this is still a manifestation of an epiglottis problem. The strange thing is, the machine does not pick up any flow limit during these times...
Please see the below graphs.
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Mask: AirFit™ N20 Nasal CPAP Mask with Headgear |
Additional Comments: humidifier is a Humidair Cleanable |
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- tidal volume.jpg (409.27 KiB) Viewed 1480 times
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- Posts: 210
- Joined: Thu Jun 07, 2018 10:28 pm
- Location: Issaquah, WA
Re: extremely low tidal volume
Minute vent is tidal volume multiplied by respiration rate, and as long as you get enough minute vent, you won’t be starving for air.
You need to get your leaks down, from what’s visible, but otherwise, doesn’t seem crazy.
You need to get your leaks down, from what’s visible, but otherwise, doesn’t seem crazy.
Sleep, sleep monster, sleep!
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- Posts: 49
- Joined: Tue Mar 12, 2019 12:01 am
Re: extremely low tidal volume
I guess was concerned that minute vent looked a little low too. This is not considered good in terms of overall leak rate? (see graph) resmed gave me a smiley face!
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Mask: AirFit™ N20 Nasal CPAP Mask with Headgear |
Additional Comments: humidifier is a Humidair Cleanable |
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- tidal volume 4.png (115.18 KiB) Viewed 1451 times
- Jas_williams
- Posts: 1120
- Joined: Tue Dec 19, 2017 2:12 pm
- Location: Somerset UK
Re: extremely low tidal volume
Your leak rate is fine, anything less than 24l/m is fineyearning4zs wrote: ↑Wed May 15, 2019 2:32 amI guess was concerned that minute vent looked a little low too. This is not considered good in terms of overall leak rate? (see graph) resmed gave me a smiley face!
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Mask: Bleep DreamPort CPAP Mask Solution |
Additional Comments: Using sleepyhead and a pressure of 6 - 21 Resmed S9 Adapt SV with a Bleep Sleep Mask |
Re: extremely low tidal volume
The machine shown on Sleepyhead does not correspond to the machine in the profile.
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Machine: ResMed AirSense™ 10 AutoSet™ CPAP Machine with HumidAir™ Heated Humidifier |
Mask: Fisher & Paykel Vitera Full Face Mask with Headgear (S, M, or L Cushion) |
Additional Comments: Back up is a new AS10. |
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- Posts: 49
- Joined: Tue Mar 12, 2019 12:01 am
Re: extremely low tidal volume
sorry, I just updated it. I've been using for her for a few weeks now. Was originally renting and then just recently bought one. The newest one I've been using for 3-4 days. The high artificial respiration rate started then.
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Mask: AirFit™ N20 Nasal CPAP Mask with Headgear |
Additional Comments: humidifier is a Humidair Cleanable |
Re: extremely low tidal volume
You may be mouth breathing a bit with a nasal mask? Keep and eye on it and I would fix leaks where I can, if for no other reason than they annoy me and arouse me from sleep. I would turn the ramp off, have the start and min pressure on 6, max 10. It's not taking much pressure to resolve any apnea.
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Mask: ResMed AirFit™ F20 Full Face CPAP Mask with Headgear |
Humidifier: S9™ Series H5i™ Heated Humidifier with Climate Control |
Additional Comments: S9 ST-A iVAPS and adapt ASV |
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- Posts: 49
- Joined: Tue Mar 12, 2019 12:01 am
Re: extremely low tidal volume
I tape my mouth, so probably no mouth breathing (doesn't seem to be leaking). But definitely leaks maybe from the mask. I could tighten it up a bit I think. The odd thing to me is there is basically no apnea recorded and even no flow limitations sometimes despite the really low tidal volume and minute ventilation. That's also why I'd be reluctant to increase the min-max pressure. My pressure never gets up to my max these days.ajack wrote: ↑Wed May 15, 2019 6:22 amYou may be mouth breathing a bit with a nasal mask? Keep and eye on it and I would fix leaks where I can, if for no other reason than they annoy me and arouse me from sleep. I would turn the ramp off, have the start and min pressure on 6, max 10. It's not taking much pressure to resolve any apnea.
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Mask: AirFit™ N20 Nasal CPAP Mask with Headgear |
Additional Comments: humidifier is a Humidair Cleanable |
Re: extremely low tidal volume
You may find, 6 isn't considered anything more than a starting pressure with the FFM, so it vents properly. You actually might find it more comfortable, as the EPR will be 2cm lower and 4.
See how the leaks go.
See how the leaks go.
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Mask: ResMed AirFit™ F20 Full Face CPAP Mask with Headgear |
Humidifier: S9™ Series H5i™ Heated Humidifier with Climate Control |
Additional Comments: S9 ST-A iVAPS and adapt ASV |
- Jay Aitchsee
- Posts: 2936
- Joined: Sun May 22, 2011 12:47 pm
- Location: Southwest Florida
Re: extremely low tidal volume
Tidal Volume is the volume of each breath. Your erroneous respiration rate is high because each breath is being counted as more than one smaller breath. These erroneous smaller breaths each have less volume than the correct whole breath; therefore, the reported Tidal Volume for each breath is smaller.
In other words, the Tidal Volume reported during periods of erroneously high Respiration Rates is based on much smaller breaths then you are actually taking.
In other words, the Tidal Volume reported during periods of erroneously high Respiration Rates is based on much smaller breaths then you are actually taking.
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Mask: AirFit™ P10 Nasal Pillow CPAP Mask with Headgear |
Additional Comments: S9 Auto, P10 mask, P=7.0, EPR3, ResScan 5.3, SleepyHead V1.B2, Windows 10, ZEO, CMS50F, Infrared Video |
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- Posts: 49
- Joined: Tue Mar 12, 2019 12:01 am
Re: extremely low tidal volume
very interesting and well noted!Jay Aitchsee wrote: ↑Wed May 15, 2019 8:41 amTidal Volume is the volume of each breath. Your erroneous respiration rate is high because each breath is being counted as more than one smaller breath. These erroneous smaller breaths each have less volume than the correct whole breath; therefore, the reported Tidal Volume for each breath is smaller.
In other words, the Tidal Volume reported during periods of erroneously high Respiration Rates is based on much smaller breaths then you are actually taking.
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Mask: AirFit™ N20 Nasal CPAP Mask with Headgear |
Additional Comments: humidifier is a Humidair Cleanable |