document updated 12 years ago, on Dec 18, 2011
diagnostic criteria
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(legend: 'fulltext' means that the study's fulltext is available; 'fulltext' means that the study's fulltext isn't easily publicly available)
terms
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- specific events during sleep
- Arousal — A sleep stage jump from a deeper stage to a less deep stage not necessarily associated with an awakening (consciousness).
- Obstructive Apnea — At least a 90% (often 100%) reduction in air flow for at least 10 seconds in spite of respiratory effort resulting in an arousal.
- Hypopnea — At least a 50% reduction in air flow for at least 10 seconds with at least a 4% reduction in blood oxygen and resulting in an arousal.
- RERA (Respiratory-Effort Related Arousal) — A reduction in air flow less than a Hypopnea whose respiratory effort results in an arousal.
sleep study measures
A sleep study (polysomnography) typically records data from these sensors:
- EEG — brain activity (identifies the current sleep stage)
- EOG — eye movements (helps identify REM stage of sleep)
- ECG — heart rhythm
- EMG — muscle activity
- nose and mouth airflow is measured via pressure transducers or a thermocouple
home sleep study
These involve portable sensors that the patient takes home, the data is recorded and stored somehwere, and then the patient returns the portable equipment to a medical facility, where the data is extracted and examined.
Specific devices on the market:
Random articles about this:
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