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billbolton wrote:

CUatX wrote:I've done a couple of a trial runs with the machine while sitting upright reading/watching TV, and it logged HIs and AIs both times.

All scoring algorithms in all flow generators are designed to work ONLY WHILE YOU ARE ASLEEP and are breathing autonomously. Any events captured by any flow generator while you are awake are MEANINGLESS.

Cheers,

Bill

I found the machine capturing these "ghost" AI and HI events while CUatX's wide awake rather disturbing. To me this is not totally "MEANINGLESS" because if the machine can't detect events correctly during wake-time breathing, how can I trust it to work correctly during sleep-time breathing?

billbolton wrote:

CUatX wrote:I've done a couple of a trial runs with the machine while sitting upright reading/watching TV, and it logged HIs and AIs both times.

All scoring algorithms in all flow generators are designed to work ONLY WHILE YOU ARE ASLEEP and are breathing autonomously. Any events captured by any flow generator while you are awake are MEANINGLESS.

Cheers,

Bill

But if you are awake there shouldn't BE any events to be catching should there? Does that mean this machine doesn't give real accurate results. I"m going to be buying my first autopap in a few days so am doing research

[quote="Bookbear"]


I'd echo what Joel said... even closeing a door in another room off the same hall would trigger the Vantage. I decided the auto start/auto off feature wasn't worth it. It's a good idea, just too sensitive.

_________________

Can that feature be turned off so you can just turn the machine on and off manually?

Anonymous wrote: But if you are awake there shouldn't BE any events to be catching should there? Does that mean this machine doesn't give real accurate results. I"m going to be buying my first autopap in a few days so am doing research

That's what keeps bugging me. During waking hours, most of us (if not all) occasionally take deep breaths, sigh, stretch, change position, etc. If the machine logs these as apneas/hypopneas, then it seems logical that it would do the same as we are falling asleep. In which case, only the trend charts the software displays are meaningful.

But them, I was a process control engineer before retiring, and we lived by what the trend recorders told us. More and more it seems I should just buy the software pack and relegate the readouts on the machine to the same status as the "idiot lights" on my car's dashboard.

Anonymous wrote:

billbolton wrote:

CUatX wrote:I've done a couple of a trial runs with the machine while sitting upright reading/watching TV, and it logged HIs and AIs both times.

All scoring algorithms in all flow generators are designed to work ONLY WHILE YOU ARE ASLEEP and are breathing autonomously. Any events captured by any flow generator while you are awake are MEANINGLESS.

Cheers,

Bill

But if you are awake there shouldn't BE any events to be catching should there? Does that mean this machine doesn't give real accurate results. I"m going to be buying my first autopap in a few days so am doing research

Well if you are awake of course there are no events - but the algorithm is designed to work while you are asleep - it asumes you are asleep and incorrectly identifies events. It's not that hard to understand. It's the way it works.

I always look at WHEN the apneas/hypopneas occur the next day and I know if I was asleep or not.

OregonLu, absolutely, in the Clinician's menu. If you need to know how to do that, PM me. It is set OFF by default, I believe, and in that case does not appear on the patient menu.

BigK and CUatX, the Vantage does not record apneas or hypopneas during the 'ramp' or 'settling' periods. These are usually user-adjustable in 5 min. increments (depending on how the clinician set up your machine). You can alter the set up yourself by going into the clinician's menu. The ramp or settling times give the patient time to get off to sleep before applying full pressure and recording events (and responding to them).

Assuming that you are using ramp (in cpap mode) or settling (in apap mode), and that you fall asleep during that time, your data are accurate.

bigk wrote:

Anonymous wrote:

billbolton wrote:

CUatX wrote:I've done a couple of a trial runs with the machine while sitting upright reading/watching TV, and it logged HIs and AIs both times.

All scoring algorithms in all flow generators are designed to work ONLY WHILE YOU ARE ASLEEP and are breathing autonomously. Any events captured by any flow generator while you are awake are MEANINGLESS.

Cheers,

Bill

But if you are awake there shouldn't BE any events to be catching should there? Does that mean this machine doesn't give real accurate results. I"m going to be buying my first autopap in a few days so am doing research

Well if you are awake of course there are no events - but the algorithm is designed to work while you are asleep - it asumes you are asleep and incorrectly identifies events. It's not that hard to understand. It's the way it works.

I always look at WHEN the apneas/hypopneas occur the next day and I know if I was asleep or not.

Well, if there's no events when we're awake then has the machine made a mistake when it declares some non-event as an event while we're awake?

Shouldn't the machine detect OSA events based on breathing pattern regardless of sleep or wake state?

khvn wrote:Well, if there's no events when we're awake then has the machine made a mistake when it declares some non-event as an event while we're awake?

It hasn't made a mistake - the algorithm doesn't know that you are awake - it's tuned for breathing patterns while you are asleep.

Shouldn't the machine detect OSA events based on breathing pattern regardless of sleep or wake state?

Coulda, shoulda, woulda, DOESN'T.

I know about the ramp/settling time - I always take my mask off when I wake up but sometimes it takes longer than my settling time to fall asleep.

Bookbear wrote:BigK and CUatX, the Vantage does not record apneas or hypopneas during the 'ramp' or 'settling' periods...

Eureka!!! (Picture lightbulb coming on)

My CPAP pressure is low (8 cm) so I have the ramp time set to 5 minutes. I'll raise my minimum pressure to just under CPAP pressure, max out the ramp time, and see what happens.

The max settling or ramp time is 45 min. Try to match the time to the time it usually takes you to get to sleep. Remember that you are not getting your full therapy pressure until the ramp or settling time has expired.

Bookbear (who's light bulb glows very dimly at times....)

Your pressure is 8? Sheesh, I'd suffocate at that low a pressure. How on EARTH can you tolerate RAMP with such low pressures??? I'd be tearing off the mask and gasping for air.

I gave up on ramp damned quick. I need more air than that!

LOL,
B.

Actually, I can breathe easily through the Opus with it disconnected from the machine. By bumping the minimum (start) pressure up closer to the CPAP pressure, therapeutic levels will be quickly reached.

khvn wrote:

billbolton wrote:

CUatX wrote:I've done a couple of a trial runs with the machine while sitting upright reading/watching TV, and it logged HIs and AIs both times.

All scoring algorithms in all flow generators are designed to work ONLY WHILE YOU ARE ASLEEP and are breathing autonomously. Any events captured by any flow generator while you are awake are MEANINGLESS.

Cheers,

Bill

I found the machine capturing these "ghost" AI and HI events while CUatX's wide awake rather disturbing. To me this is not totally "MEANINGLESS" because if the machine can't detect events correctly during wake-time breathing, how can I trust it to work correctly during sleep-time breathing?

machine has NO clue if you are awake or sleep, it does NOT ignore wake-time breathing,

it only ignores that IF you enable and use the "Settling" feature which requires manual enabling by pushing the Settling button when first turning on the machine. Respironics "settling" feature is incorporated within therapy and I think it is set at 18 or 20 minutes. Other machines may also incorporate "settling" within any Ramp feature used.

[quote="CUatX"]Ah think Ah got Haints in mah machine!

The autostart option is enabled, and occasionally during the day, the machine will start on it's own (the hose is disconnected when not in use), run for a few seconds, and then turn off. It's spooked my wife more than once.

I've heard the Resmed Vantage is known for being overly sensitive to hypopneas and this certainly seems to be the case with mine. I've done a couple of a trial runs with the machine while sitting upright reading/watching TV, and it logged HIs and AIs both times. I wonder if the two phenomena might be related, perhaps because of an overly-sensitive pressure sensor or algorithm. Or do I need an exorcist?