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This
glossary is being updated.
A
B C D E F
G H I J K
L M N O P
Q R S T U
V W X Y Z
A
Arousal:
An interruption of sleep lasting greater than 3 seconds.
B
BR Arousal index:
The number of
breathing related arousals(apnea, hypopnea, snoring & RERAs)multiplied by
the # hours of sleep.
Bruxism: Grinding
of the teeth.
C top
Central apnea: A respiratory
episode where there is no airflow and no effort to breathe lasting greater than
10 seconds.
D
E
EEG/EOG: Comments about sleep
stages, brain waves (EEG), or eye movements (EOG)
EKG/ECG: Comments
about heart rate, abnormal heart beats, etc.
EMG: Comments
about leg movements and or teeth grinding (bruxism).
F
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G
H
Heavy breathing with puffing out: Click here to listen (mp3)
Hypopnea:
A respiratory episode
where there is partial obstruction of the airway lasting greater than 10
seconds. Also called partial apnea
or hypo-apnea.
I
J
K top
L
M
N
Non-supine: Sleeping in any
position other than on the back.
NSR:
Normal sinus rhythm.
NPSG:
Nocturnal Polysomnogram, or sleep study.
(#)Number of Awakenings: The
number of pages scored as wake after sleep onset.
O
Obstructive apnea:
A respiratory
episode where there is a complete cessation of airflow lasting
greater than 10 seconds.
Click here to listen (mp3)
P
PLMs: Periodic limb movements.
PLM arousal index: The
number of periodic limb movements that cause arousals multiplied by the number
of hours of sleep.
PSGT: Polysomnographic
technologist.
Q
R
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REM latency: Latency to
REM(dreaming) from sleep onset.
RERAs: Respiratory effort related
arousals. Episodes
that are not apneas or hypopneas, often related to loud snoring, that generally
do not cause a decrease in oxygen saturation.
Click here to listen (mp3)
Respiratory: Any
specific comments about respiratory events.
RPSGT:
Registered polysomnographic technologist.
S
Sleep efficiency: Total sleep time
multiplied by time in bed.
Sleep latency: The
first 30 seconds (one `epoch' of recording time) of sleep.
Sleep onset:
The first 90 seconds (3 `epochs) of
uninterrupted sleep.
Sleep stage shifts:
The number of incidents of sleep stage changes.
Snoring intensity:
Level of snoring loudness determined by the sleep technologist.
Ranging in degrees from mild to very loud snoring.
Click here to listen (mild to moderate snoring)
Click here to listen to nasal snoring
Spontaneous arousal index:
The number of spontaneous arousals (e.g. arousals not related to respiratory
events, limb movements, snoring, etc) multiplied by the number of hours of
sleep.
Stage 1:
The lightest stage of sleep. Transitional
stage from wake. top
Stage 1 shifts:
The number of times the sleep stage changed to stage 1.
Stage 2:
The first true stage of sleep.
Stages 3/4: The deepest, most restorative sleep.
Stage
REM: The dreaming stage; Normally occurs every
60-90 minutes.
Supine:
Sleeping on back.
T
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Time in bed: The time in the
study from `Lights Out' to `Lights On'.
Total arousal index:
Total number of all arousals multiplied by the number of hours of sleep.
Total # of PLMs:
The number of leg movements in sleep that last greater than 0.5 seconds.
Total sleep time:
Total time asleep.
U
V
W
WASO: Wakefulness after sleep onset.
WNL: Within normal limits.
X
Y
Z
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