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20 Cards in this Set
- Front
- Back
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Weight (lbs) ÷ height (in inches) squared then x 703 (square the inches 1st then x by 703) |
Mass body index |
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This is how much time the patient spent in each stage of sleep, so this is 5 separate problems. To calculate in a %, take the number of minutes of that stage ÷ by the total sleep time (TST) x 100. To calculate in minutes, add up all the pages (epochs) of each stage (separately) then ÷ each by 2. |
Sleep Stages |
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This is the total amount of recording on the patient. The number of pages (epochs) from lights on (end of test) minus number of epochs of lights out (start of test) ÷ by 2 = TRT in minutes. |
Total Recording Time (TRT) (sometimes called the total time in bed TIB) |
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This is the total amount of time the patient was asleep during the recording. Take the total number of recorded pages (epochs) – the total number of wake and movement time pages (epochs), ÷ 2 = the total sleep time in minutes. Or, add all the pages (epochs) of sleep stages. To calculate the % of TST, take the TST in minutes ÷ the TRT in minutes then multiply by 100 = % of the TST. |
Total Sleep Time (TST) |
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This is the time from lights out to the first onset of sleep (no matter what stage of sleep it is). Find the amount of time from lights out to sleep onset (you take the page number of sleep onset and subtract the page number of lights out), then ÷ 2 |
Sleep Latency |
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This is how much time it took the patient to reach REM after sleep onset (they could have sleep onset REM). Take the page number of REM onset – the page number of sleep onset, then ÷ 2 = REM latency in minutes. |
REM Latency |
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This is the number of respiratory events (stopped breathing or less volume of breathing) the patient had. Take the number of apneas + the number of hypopneas ÷ by the total sleep time (in minutes) x 60 = this |
Respiratory Disturbance Index (RDI) (also called the apnea/hypopnea index) |
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This is a run of at least four successive leg movements, each separated by 4-90 seconds. The length of each movement is .5 – 5. Seconds. Take the number of periodic limb movements ÷ by the total sleep time (in minutes) x 60. |
Periodic Limb Movements |
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This is the amount of time the patient spends awake after they have already been asleep. Add up all the pages (epochs) that are scored as awake (no movement time) after sleep onset, then ÷ by 2 = the WASO in minutes. In other words, # of epochs scored as wake – (sleep onset epoch # - lights out epoch #) ÷ by 2. |
Wake After Sleep Onset (WASO) |
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This is where more than 50% of the epoch has movement artifact that obscures the recording. It is not counted as awake or asleep. To calculate in a %, take the movement time (in minutes) ÷ by the total sleep time then multiply by 100. To calculate in minutes, add up all the pages (epochs) that are scored as movement time and ÷ by 2. |
Movement Time |
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Take the total sleep time in minutes ÷ by the total recording time in minutes then x 100 = % of sleep efficiency |
Sleep Efficiency |
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Take the total sleep time in minutes ÷ by the total recording time in minutes then x 100 = % of sleep efficiency |
Sleep Efficiency |
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Paperspeed of 10mm/sec = 30 second epoch You divide by what |
2 |
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Take the total sleep time in minutes ÷ by the total recording time in minutes then x 100 = % of sleep efficiency |
Sleep Efficiency |
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Paperspeed of 10mm/sec = 30 second epoch You divide by what |
2 |
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Paperspeed of 15mm/sec = 20 second epoch You divide by how much |
By 3 |
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Take the total sleep time in minutes ÷ by the total recording time in minutes then x 100 = % of sleep efficiency |
Sleep Efficiency |
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Paperspeed of 10mm/sec = 30 second epoch You divide by what |
2 |
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Paperspeed of 15mm/sec = 20 second epoch You divide by how much |
By 3 |
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Paperspeed of 30mm/sec = 10 second epoch You divide by how much |
By 6 |
