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Sleep Health Definitions

Apnea – the complete pause of airflow during respiration for at least 10 seconds

AHI - AHI stands for Apnea/Hypopnea Index.  This is the average times per hour of sleep you stop breathing.  To arrive at this number, we take the total number of times you stop breathing during the sleep study and divide that out over the total hours slept.  This number determines how severe your sleep apnea is.

Central Sleep Apnea due to Cheyne Stokes Breathing Pattern  - recurrent apneas or hypopneas alternating with periods of waxing and waning respiratory tidal volumes due to waxing and waning respiratory effort, mainly due to a diminished respiratory drive

Hypersomnia – excessive sleepiness

Hypopnea – a partial pause of airflow during respiration for at least 10 seconds with a concurrent drop in blood oxygen levels of at least 4%

Insomnia – repeated difficulty in sleep initiation, duration, or consolidation that occurs despite adequate time and opportunity for sleep that results in some form of daytime impairment

Narcolepsy – excessive daytime sleepiness with REM sleep being achieved upon sleep onset

Obstructive Sleep Apnea – repetitive episodes of complete or partial upper airway closure during sleep resulting in a complete or partial pause of respiration with respiratory effort

PAP induced Central Sleep Apnea - some patients do not tolerate PAP therapy well and present Central Sleep Apnea when on PAP therapy.  These patients usually need a different type of PAP called Auto SV which treats the underlying Central Sleep Apnea.

Parasomnia – undesirable physical events or experiences that occur during entry, within, or during arousal from sleep, e.g. sleepwalking, sleep terrors, sleep related eating disorder

Periodic Limb Movement Disorder - a movement disorder which involves the legs moving at regular intervals during sleep.  Can cause the patient to wake up out of sleep.

Primary Central Sleep Apnea - repetitive episodes of pauses of respiration with no respiratory effort

REM AHI - just llike AHI, this is an average of how many times you stop breathing, but only during your REM or dreaming sleep.  This index allows us to see if your sleep apnea is more severe in REM sleep or when your body is most relaxed.

Restless Leg Syndrome - the need to move the legs or a "creepy crawly" feeling in the legs that causes discomfort.  Usually seen upon awakening and/or while going to sleep.  This disorder stops during sleep.

Sleep Related Movement disorders – relatively simple body movements during sleep that causes a disturbance to sleep, e.g. leg cramping, restless leg syndrome, grinding teeth