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Impact of "% spontaneous cycled breaths"
In ResScan on the statistics tab under respiratory rate there is a number for % spontaneous cycled breaths. This is a number that shows up from my VPAP Auto 25 operating in spontaneous mode. I presume this means breaths where the patient goes from inhale to exhale before the machine goes from to EPAP because of the Ti(max) setting.

My real question is, "What is the importance of this number"? Is it just telling me that I need to increase my Ti(max) setting if it is below a certain percentage and what is that percentage?

Can anyone point me in the right direction to find the answer to this question?
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Payton.. I'd like to know the answer to that one too. I'll follow this thread to see if anyone comes up with an answer.

It would seem you answered your own question
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I have chased down some hits from Google but have not seen anything definitive. Mostly questions about " What is % spontaneous cycled breaths?". It does seem that this might be more of a ventilator concern. I also noticed someone saying that they were getting both % cycled and triggered figures.

I had found the link you posted but it looked to me like it was for ventilators. I also do not know if it is something that needs to be addressed if it is lower than say 90% or some other target.

Best Regards,

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Payton: for our machines, it's the % of triggers from EPAP to IPAP that we initiate by inhalation. i.e.-- those not caused by Timax.

I believe, with machines that have ST mode, they have a timer on both IPAP and EPAP. So, they report the % of both cycled and triggered.
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Per the S9 VPAP Auto Clinician's Manual, the S mode, ST mode, and the Vauto mode display "% spontaneous triggering or cycling". That is a quote from the chart on page 17 of the manual. I do not know if that says that they display either/or or if it means they display both. What I thought I saw was "%SpontT" and "%SpontC" and maybe it was for an ST machine.
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Talked to a ResMed person this morning. Had left a message requesting information. ResMed person said that the % spontaneous cycled breaths figure is strictly for ventilators and has no importance for CPAP of VPAP. As far as the respiratory rate doubling question that I asked she referred me to my DME. Oh well.

Intrerestingly (to me anyway), my % spontaneous cycled breaths (SpontC) decreased from 90+ to approximately 60 when I raised my Ti(min). Last night, I reduced my Ti(min) from 1.2 to 1.0 and my SpontC this morning was 91.

On the flip side, as I raised my Ti(min) slowly from 0.3 to 1.2 the amount of spiky respiratory rate doubling reduced to almost nothing. It seems to have come back a little last night when I lowered my Ti(min) from 1.2 to 1.0.

Well apparently neither measurement anomaly is of much physical importance so I am going to let well enough alone.


Its too bad you do not have a VPAP. Just look at all of the settings you could play with. Are you jealous?

Best Regards,

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