I received the official sleep study summary yesterday afternoon. I know what everything means, but I’m still trying to figure out how to practically apply it. I thought I’d share it with everyone and see what thoughts you might share.
Here is the official report (you can click in the upper-right corner to make it larger), given in summary form:
At the bottom of page #2 is a summary of what is considered “normal” for various measurements. I’ve summarize it (below) to make it easier to evaluate.
|Measurement||Description||Scale||Oct. 2011||Dec. 2012|
|BMI||Index relating weight to height; a person's weight in kilograms (kg) divided by height in meters squared. It does not actually measure the percentage of body fat.||<18.5%: Underweight|
18.5%-24.9%: Normal Weight
|Minutes in Bed (MIB)||Total minutes from beginning to end of study.||N/A||390 minutes||442 minutes|
|Minutes Asleep (MA)||Time in any one of the four sleep stages.||N/A||283.5 minutes||390.5 minutes|
|Sleep Efficiency (= MA ÷ MIB)||A simple calculation, expressed as a percentage, where Minutes Asleep (MA) is divided by Minutes in Bed (MIB).||>85%: Normal||73% (283.5 ÷ 390)||88.3% (390.5 ÷ 442)|
|Sleep Latency||The minutes it takes to fall asleep once the study begins.||>5 but <20: Normal||1.0||N/A (Ryan was asleep at onset)|
|REM Latency||The minutes it takes to reach the initial REM stage.||>70 but <120: Normal||110 minutes||113.5 minutes|
|Sleep Architecture||The percentage of time spent in each sleep stage.||Stage I: 3%-5%|
Stage II: 50%-60%
Stage III: 10%-20%
|25.6% (72 min)|
58.9% (167 min)
13.9% (39 min)
1.6% (5 min)
|1.7% (7 min)
93.3% (364 min)
4.4% (17 min)
0.6% (2 min)
|Snoring||Detected/None Detected||None Detected||None Detected|
|AHI: Apnea Hypoapnea Index||Index of sleep apnea severity that combines apneas and hypopneas.||<5: Normal|
|Average Heart Rate (bpm)||Beats per minute (bpm)||Not Defined||84 bpm||64 bpm|
|EKG Heart Rhythms||Sinus rhythm is the normal beating of the heart.||Sinus Rhythm: Normal||Sinus Rhythm: Normal||Sinus Rhythm: Normal|
|Spontaneous Arousals (Average per Hour)||An abrupt change not related to respiratory events, limb movements, snoring, etc).||<5: Normal|
Updated: December 28, 2012 to include Sleep Study performed on 12/12/12.
Perhaps most encouraging from the study is Ryan does, indeed, experience sleep and not some form of “permanent hibernation” (that’s my chose of words). My frustration with the report is it’s too general. For instance, he has mild levels of arousals… but what caused these? I suspect most can be attributed to us tending to him. Yes, we try to group these task together (eye, oral, shifting, water, etc.) to reduce disturbance to his sleep, so what is the difference? Can we be more effective? Does this explain the shift in his sleep architecture (i.e., sleep stages) ? I suspect it inhibits him from reaching REM (since we break his sleep cycle), but I need proof.
With this in mind, I requested (much) more detail. I want it all! I am educated and have practical knowledge of statistics, so I want the data so raw it reeks. I’ll be more comfortable with my analysis and conclusions.