problem downloading data from Resmed Adapt SV...

[sleepgem]

Folks,

I've not downloaded data from my unit on to PC in about 4-5 months. Now, it's time to download it. I am having problems downloading data from ResdMed Adapt SV unit into ResScan. I updated my Windows OS and it no longer recognizes the unit. I seem to have totally forgotten how I used to do this properly with this unit. I used to download data from this unit while I had Win Vista machine and worked fine. Can someone please share how they connect the unit to PC and make Windows recognize the device?

I use Serial to USB cable. I installed USB driver included in ResScan as well as driver that came with USB cable (Monoprice.com). I connect serial (from Monoprice) end of cable to ASV unit and USB end to PC (XP or Win 7 - neither works). The device is not recognized by Windows at all. Hence, ResScan does not recognize it either.

Is there any setting I suppose to select from MENU on Resmed Adapt SV before I begin download,etc.?

Please advise.

Thanks,
sleemgem

[JohnBFisher]

Nope. You might need to reinstall the ResScan software. I suspect the previous driver they had with ResScan to read the machine data is not compatible with Windows 7. Doing a reinstall should do the trick. Of course, finding the latest version might be another battle.

[avi123]

For a long time I have been looking here to see graphs from Resmed VPAP ASVs but I have seen none untill I found this one:

WOW, IPAP above 20 cm h2o!




from here:


viewtopic/t54016/Any-Adapt-SV-Data-Experts.html

[JohnBFisher]

avi123, I get an IPAP above 20 almost every night (actually upto 30cm H2O). It's not too unusual if you have fairly severe CSA. As I fall asleep, I stop breathing. The machine ramps WAY up to compensate and help me through that transition. Without the ASV unit, I can not fall asleep because I keep stopping breathing (over and over again). But it's not your garden variety Central Sleep Apnea. I tend to stop for more a minute or more. Talk about massive headaches!

Remember, if the unit detects your next breath will not meet the average you had during the past three minutes (if I remember correctly the sliding window averages the volume of air exchanged during the past three minutes), then it will increase the pressure. This is the "adaptive servo-ventilation" phase of the machine. It attempts to break the undershoot / overshoot cycle that seems to be at the heart of Central Sleep Apnea. By acting as a ventilator and supporting breathing it helps decrease the CO2 in the blood stream. This prevents the undershoot side of the cycle (not breathing enough to exchange CO2 for O2). By breaking the cycle it helps eliminate the resulting central apnea that occurs once the body overcompensates (by breathing faster and blowing off too much CO2, since too little CO2 suppresses breathing).

Those high pressures play real havoc with most masks. Mask leaks are pretty common. It's why I recommend a mask liner to help maintain the seal, regardless of the antics of the machine.

[avi123]

Ben, IPAp pressure between 20 and 30 cm h2o is a lot of pressure.

In operating rooms, for paralyzed anesthetized adult patients undergoing pressure controlled ventilation using laryngeal tube, they use only 17 cm h20 for minimal expired tidal volume of 6 mL/kg. In these cases the patients does not breathe spontaneously.

During short outpatient surgical procedures in which general anesthesia was required, and the patients were breathing spontaneously (none paralyzed) , peak airway pressures has been limited to 15 cm h20 for tidal volumes of 6 to 8 mg/kg, by using laryngeal mask airway (LMA) and positive pressure ventilation.

They found that peak airway pressures greater than 20 to 30 cm h2o have large impacts on the air leak from the LMAs.

Ben, taking muscle relaxants would not help you reduce the pressure?

[sleepgem]

Nope. You might need to reinstall the ResScan software. I suspect the previous driver they had with ResScan to read the machine data is not compatible with Windows 7. Doing a reinstall should do the trick. Of course, finding the latest version might be another battle.

Well, I moved over to Windows XP SP3 machine as well with same ResScan (latest) app. I am having trouble either XP or Win7 recognize the unit when attached.

Questions:

1. Is there any setting that need be selected on the ASV unit when you attach it to PC?

2. Does anyone remember the sequence of installation (e.g install rescan first, then USB driver, then attached unit and then run resscan,etc.).

Any input would be appreciated.

Thanks,
sleepgem

[JohnBFisher]

... 1. Is there any setting that need be selected on the ASV unit when you attach it to PC? ...

Nope. Not that I remember. But like you, I've not used it in a long time. No problems with sleep = no need to look at the data.

... 2. Does anyone remember the sequence of installation (e.g install rescan first, then USB driver, then attached unit and then run resscan,etc.). ...

If I remember correctly, I installed the USB driver, installed Rescan, attached the unit (powered off), power on the unit, then run rescan, and allow it to collect data... But for the life of me I don't remember all the steps needed to get Rescan to read the unit.

Not sure that helps any. But hope you find the right combination of crossed fingers and tongue sticking out of the corner of your mouth.

[ozze_dollar]

I recently downloaded ResScan and I use it on my laptop because it has a card reader. I always thought it was just for loading photos from my camera. My os is is vista. I open the software and then insert the SD card. Then press download. All seems to work well if I could just understand what i am looking at.
The graphs have maximum,95percentile,avarage.

I think the average is my average,the 95 percentile is what most people would score,and the maximum is the most it should ever be,is that right????

[avi123]

As I understand it, there is this by Resmed VPAP™ Adapt SV Bilevel Machine which looks like the S8 series body. And there is this from the S9 series:

http://www.resmed.com/us/products/s9_vp ... nc=dealers

The S9 uses standard SD data card (as in a digital camera) and I know how to feed the ResScan from it into my Laptop. But I don't know about that S8 screwy card.

[Pugsy]

The graphs have maximum,95percentile,avarage.

I think the average is my average,the 95 percentile is what most people would score,and the maximum is the most it should ever be,is that right????

Average is simple average.

95 percentile number is just a number where you spent 95 % of the time at OR below. Has nothing to do with anyone else. It only pertains to you.

Maximum is just the highest number (of what is being reported) reached. It could possibly go higher depending on what it is reporting and if there is a ceiling set for what is being reported. Leaks have no ceiling. Pressures may have a ceiling depending on settings.. cpap or apap with narrow range or higher ceiling with wide open range. My APAP is set 10 min and 20 maximum. On a night where the highest pressure I see reported being 15 then that 15 is the max for that night.

[JohnBFisher]

As I understand it, there is this by Resmed VPAP™ Adapt SV Bilevel Machine which looks like the S8 series body. And there is this from the S9 series:

http://www.resmed.com/us/products/s9_vp ... nc=dealers

The S9 uses standard SD data card (as in a digital camera) and I know how to feed the ResScan from it into my Laptop. But I don't know about that S8 screwy card.

Minor corrections: The older ASV unit is based on the S7 body. There was not an S8 ASV unit. Unless you have a very expensive Reslink module, the S7 ASV unit only uses a serial COM port to connect to the computer. That Reslink module would allow a Smart Card to contain the data, which could be read on the computer.

[ozze_dollar]

The graphs have maximum,95percentile,avarage.

I think the average is my average,the 95 percentile is what most people would score,and the maximum is the most it should ever be,is that right????

Average is simple average.

95 percentile number is just a number where you spent 95 % of the time at OR below. Has nothing to do with anyone else. It only pertains to you.

Maximum is just the highest number (of what is being reported) reached. It could possibly go higher depending on what it is reporting and if there is a ceiling set for what is being reported. Leaks have no ceiling. Pressures may have a ceiling depending on settings.. cpap or apap with narrow range or higher ceiling with wide open range. My APAP is set 10 min and 20 maximum. On a night where the highest pressure I see reported being 15 then that 15 is the max for that night.

Thanks Pugsy,thats very helpful. I must have another look at it though,/my average is a lot lower than my 95 percentile. How could that be? mmmm

[ozij]

When you use a Serial to USB emulation you have to check the comm port (serial port) details on the emulated port, and then you have to make sure ResScan tries to read the same port.

Try disconnecting all other devices connected to USB ports on your computer, and make sure you're not running another program while trying to download. I know that on my computer, ResScan will not find the device if my Pulse oximeter cable is connected.

[Pugsy]

/my average is a lot lower than my 95 percentile. How could that be? mmmm

Average can be quite a bit lower than the 95 percentile number. I see it often. I often see wide variations in the percentile number also. My machine does a 90 % number. I have seen it hit 17cm and I might see 12 cm the next night.

My overall average though rarely gets much above 12 cm no matter how high the 90 % number goes. My APAP is set at 10 min and 20 max. While your machine is different, the law of numbers still pertains. You could manipulate the average number to be closer to the 95% number by simply raising minimum so that the average gets raised but there is no real need to do that. People who use EPR can also raise the simple average pressure just by reducing EPR or turning it off.

They are just numbers and numbers can easily be manipulated.

[JohnBFisher]

/my average is a lot lower than my 95 percentile. How could that be? mmmm

... They are just numbers and numbers can easily be manipulated. ...

Well, as someone who made a living out of sorting out performance data in VERY large computer systems, I can provide some explanation.

Let's take two sets of numbers and see what they tell us.

49, 51, 49, 51, 49, 51, 49, 51, 50

1, 99, 1, 99, 1, 99, 1, 99, 50

These are two COMPLETELY different sets of numbers. But here's the thing. The Average of both sets of numbers is the same. The average is 50:

(49 + 51 + 49 + 51 + 49 + 51 + 49 + 51 + 50)/9 = 50

(1 + 99 + 1 + 99 + 1 + 99 + 1 + 99 + 50)/9 = 50

So, are the sets the same? Definitely not. Imagine if these were pressures:

9, 11, 9, 11, 9, 11, 9, 11, 10

5, 15, 5, 15, 5, 15, 5, 15, 10

Once again, we have the same average. But which do you think would be easier to sleep with? Of course, Set 3 has less variation and less of a tendency to cause sleep disturbances.

So, how do you quickly sort out the two sets? Well, mathematicians use tools such as "standard deviation" and "95th percentile" to help understand the differences that "average" does not capture. In fact, to teach people how poorly "average" captures the shape of a set of numbers, I tell them that "Average is just that. Average." But by using things like standard deviation or the 90th or 95th percentile, we have a better feel for the "shape" of the data set.

In this case, 95th percentile tells us that almost all the time the number was lower than this value. There are a few higher outliers that are eliminated. By comparing the average to the 95th percentile we can quickly see how closely the average was close to the higher values. Is there a large spread there? Or is it fairly close to the average. You see how it improves what we understand about the data?

Hope that helps explain why the machines use the 95th percentile in addition to the average.