First Night Results Data

Trying understand the data I am seeing. Have a bit of studying to do.
What does this first night of data tell you? Any other thing I should post to help evaluate?

Details First Night
AHI 2.86
RERA Index 1.69
Hours per Night 07:41
Pressure 8.00
Average Total Leaks 33.58
95% Total Leaks 51.00

AHIApnea / Hypopnea Index 2.86
HypopneaHypopnea 0.78
ObstructiveObstructive Apnea 1.30
Clear AirwayClear Airway Apnea 0.78
RERAResp. Effort Related Arousal 1.69
VSnore2Vibratory Snore #2 1.04
PB/CSRPeriodic Breathing 0.00%

Channel Min Med 95% Max
PressurePressure (cmH20)
W-Avg: 7.87 8.00 8.00 8.00 8.00
Minute Vent.Minute Ventilation (L/min)
W-Avg: 6.14 0.12 5.75 10.50 23.38
Resp. RateRespiratory Rate (breaths/min)
W-Avg: 13.42 7.77 13.40 16.40 19.60
LeaksLeak Rate (L/min)
W-Avg: 6.67 0.00 0.00 23.00 26.00
Total LeaksTotal Leak Rate (L/min)
W-Avg: 33.58 19.00 28.00 51.00 54.00
SnoreSnore (unknown)
W-Avg: 0.04 0.00 0.00 0.00 1.00
Insp TimeInspiratory Time (seconds)
W-Avg: 2.43 0.60 2.26 3.66 5.40
Exp TimeExpiratory Time (seconds)
W-Avg: 2.08 0.12 2.12 3.00 3.66
Tidal VolumeTidal Volume (ml)
W-Avg: 456.89 16.67 420.00 820.00 1760.00

kcellwood,

Welcome to the forum.

You write:

kcellwood wrote:Trying understand the data I am seeing. Have a bit of studying to do.
What does this first night of data tell you? Any other thing I should post to help evaluate?

Details First Night
AHI 2.86
RERA Index 1.69
Hours per Night 07:41
Pressure 8.00
Average Total Leaks 33.58
95% Total Leaks 51.00

This data provides a quick summary of what happened overnight.

The good news is these numbers basically say you had a very good first night on paper.

You used the machine for 7 hours and 41 minutes. That's basically a full night's sleep for a non-CPAPer.

You treated AHI was 2.86---that means that machine scored about 3 apneas/hypopneas for each hour the machine was running. These are the apneas and hypopneas the machine did not manage to prevent. Typically a treated AHI < 5 is considered acceptable. (An untreated AHI < 5 on a sleep test is considered "normal") You can compare this treated AHI with the AHI on your diagnostic sleep study to get an idea of the number of events the CPAP prevented from happening.

Your PR System One APAP machine is set to run in CPAP mode at 8cm of pressure. That's undoubtedly what your prescription was for. It's important to understand that the PR System One records total leaks, which include the intentional leak rate that is built into the mask so that you don't rebreathe CO2. You're using a Swift FX nasal pillows mask. At 8cm of pressure, the intentional leak rate is about 30 L/min. Your average leak rate of 33.58 L/min indicates that you probably don't have a major leak problem going on. The 95% leak rate = 51 L/min, which is a bit high, but probably not high enough to be flagged as a Large Leak in Encore. (SleepyHead cannot flag Large Leaks for PR machines.) For at least 5% of the night you were leaking AT or ABOVE 51 L/min. And how long is 5% of the night? 5% of one hour is three minutes and you had the machine on for 7 2/3 hours. So you had a leak rate that was ABOVE 51 L/min for no more than 3*7.6667 = 23 minutes. You may have had a bit of mouth breathing or it may be that the mask was slightly ajar for a while. To really find out just how "bad" your largest leaks were, you need to look at the leak graph in SleepyHead. But because that average leak rate is right around the expected leak rate for your mask, there's a very high probability that the worst of your leaks are not bad enough to worry about---unless they were waking you up during the night.

AHIApnea / Hypopnea Index 2.86
HypopneaHypopnea 0.78
ObstructiveObstructive Apnea 1.30
Clear AirwayClear Airway Apnea 0.78

This is just the breakdown of the AHI into the different types of events. About half of the events recorded were OAs. The other half were split evenly between hypopneas and CAs.

RERAResp. Effort Related Arousal 1.69
VSnore2Vibratory Snore #2 1.04
PB/CSRPeriodic Breathing 0.00%

The PR scores RERAs using a proprietary algorithm that looks for a series of breaths with flow limited characterizations followed by what look like "recovery breaths." This is designed to give an approximation of how many RERAs would have been scored in an in-lab sleep test using both the flow rate data and the EEG data. Your machine scored an average of 1.7 RERAs per hour for the night.

The snoring data is displayed very differently in SH than it is in Encore and it's not clear what the best way to understand this data is. I have to say that I've not seen as VS #2 index in my own Sleepy Head reports. What version of SH are you using and what computer system are you using? At any rate, since this is an index, the machine scored an average of 1 VS #2 per hour. You can read more about how the PR machines record snoring data and how that data is displayed in SleepyHead by going to viewtopic.php?f=1&t=88983&st=0&sk=t&sd= ... 15#p868441

PB/CSR breathing is a well defined pattern of waxing and waning breathing that can be related to either central sleep apnea or congestive heart failure when the percentage of PB is high night after night after night. Obviously on this night PB was not an issue.

Thanks for the details of the report. I am using SH 0.9.3-0 (beta) on a Windows XP Home Edition