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Sleep Disorders Specialty > Diagnostics & Therapeutics E1-E11 > Flashcards

Diagnostics & Therapeutics E1-E11 Flashcards

1
Q

To convert epochs into minutes, what should you do?

A

Divide by 2 (an epoch is 30 seconds.)

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2
Q

What does it mean when “lights out” happens?

A

All calibrations are completed and all devices are turned off in the patient’s room.

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3
Q

What does it mean when “lights on” happens?

A

Post-calibrations are completed and the technologist awakens the patient.

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4
Q

If N1 is recorded in 30 epochs, how many minutes is that?

A
  1. (30 divided by 2)
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5
Q

How do you obtain the percent of sleep?

When you calculate it, should you include W stage?

A

Divide the number of minutes in that sleep stage by the total sleep time (TST), then multiply by 100.
Do not include W stage. (Do not add wake by mistake)

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6
Q

What is Total Recording Time?

A

TRT is the total testing time from lights out to lights on.

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7
Q

What is sleep efficiency?

A

The percent of time spent asleep compared to the TRT.

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8
Q

What is SPT and what is the definition?

A

Sleep Period Time

The time the individual had available to sleep.

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9
Q

What is sleep latency/onset?

A

The time in minutes from lights out until the first recorded stage of sleep.

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10
Q

What is an MSLT?

A

Multiple Sleep Latency Test

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11
Q

What is the median sleep latency?

A

The muddle number of naps (in numerical order) in an MSLT.

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12
Q

What is the mode sleep latency?

A

The number that occurs most often.

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13
Q

What is the Sleep REM Latency?

A

Sleep onset to the first epoch of stage R (in minutes)

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14
Q

What is the WASO?

A

Wake After Sleep Onset.

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15
Q

How do you calculate the Sleep Efficiency Percent?

A

TST divided by TRT or TIB x100.

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16
Q

What is TIB?

A

Time in bed

17
Q

What is AI?

How is it calculated? (Two ways to calculate it.)

A

Apnea Index
Number of apneas divided by hours of sleep
Or
Number of apneas divided by TST x60
(When counting apneas, include central, obstructive, and mixed.)

18
Q

What is the HI?

How is it calculated? (Two ways to calculate it.)

A

Number of hypopneas divided by hours of sleep
Or
Number of Hypopneas divided by TST in minutes.

19
Q

What is the AHI?

How is it calculated? (Two ways to calculate it.)

A

Number of apneas + hypopneas divided by hours of sleep.
Or
Number of apneas + hypopneas divided by TST (in minutes)
Do not include RERAs.

20
Q

What is the RDI?
How is it calculated (Two ways to calculate it.)
How do you calculate events per hour?

A

RERA + apneas + hypopneas divided by hours of sleep
Or
RERA + apneas + hypopneas divided by TST (in minutes)
NOTE: Multiply by 60 to get events per hour

21
Q

What is a moderate AHI?

What is a mild and severe AHI?

A

Moderate is 16-30 events per hour.

Mild is 5-15, severe is 31 or greater

22
Q

When calculating TRT, do you include the amount of time the patient gets out of bed to go to the bathroom?

A

Yes, include it.

23
Q

What is normal sleep efficiency?

What does it mean if the patient has too little or too much sleep efficiency?

A

80-94%
Less than 80% = insomnia
More than 94% = High sleep efficiency (narcolepsy or idiopathic hypersomnia)

24
Q

What is PLMS?
How do you calculate the PLMS Index? (Two ways to calculate it.)
What is a normal PLMS?

A 
Periodic Limb Movements of Sleep.
Number of PLMS divided by hours of sleep
Or
Number of PLMS divided by TST
Fewer than 5 per hour is normal.
25
Q

What is the PLMS Arousal Index?

How is it calculated? (Two ways to calculate it.)

A

Number of PLMS with arousals divided by hours of sleep
Or
Number of PLMS with arousal divided by TST in minutes x60

26
Q

What is the saturation nadir?

A

Lowest recorded O2sat during the test.

27
Q

When is a split-night study recommended?

A

AHI of 40+ during at least 2 hrs of baseline recording with at least 3 hrs of time remaining for PAP titration.

28
Q

How do you calculate BMI (Body Mass Index)?

A

Bodyweight in pounds / Height in inches x height in inches (not a typo)
Then multiply by 703 (p. E11)

29
Q

What is a normal BMI?

A

18.6-24.9

30
Q

What is overweight BMI?

A

25-29.9

31
Q

What is obese BMI?

A

30-39.9

Sleep Disorders Specialty (21 decks)

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