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Sleep Centers of Northern Virginia
Nocturnal Polysomnogram, NPSG:
A standard overnight diagnostic sleep study used to assess sleep disorders, including sleep apnea, periodic limb movement disorder, hypersomnia, and parasomnias. The study measures multiple physiological parameters simultaneously including respiratory effort, airflow, EEG (brain waves), EKG (Heart rhythm), EMG (muscle movement), oxygen saturations, body position, and snoring intensity.
Positive Airway Pressure (CPAP/BiPAP/ASV) Titration:
A study used to determine the optimized settings for use of positive airway pressure to treat sleep apnea syndrome. The patient is fit with one of many available interfaces (masks) to determine the patient's individual preference, then, once asleep, positive airway pressures are slowly increased to find the most effective setting in reducing apneic events.
Split Night Study:
A sleep study during which a patient undergoes standard polysomnography during the first two hours of sleep. If the patient is noted with severe sleep apnea CPAP is initiated in an attempt to determine treatment options during a single night's evaluation. If the patient is noted with less than severe sleep apnea in the first 2 hours of sleep the study is compleated as a standard overnight polysomnography.
Multiple Sleep Latency Test, MSLT:
A study performed during the day, typically following a full diagnostic NPSG. Used to objectively determine a patient’s level of sleepiness after an adequate night’s sleep. The MSLT is a series of timed naps two hours apart, during which the patient is monitored for the onset of sleep and the onset of REM sleep. The MSLT is used to diagnose narcolepsy, other disorders of excessive daytime sleepiness (hypersomnia), and to objectively assess residual sleepiness in patients with treated sleep disorders when medication is being considered.
Maintenance of Wakefulness Test, MWT:
A study performed to determine whether a patient is able to remain awake. The MWT may be used to evaluate a patient's ability to perform specific occupational duties and/or to assess the efficacy of the treatment of a sleep disorder.
Home Sleep Testing, HST:
More limited overnight sleep monitoring performed in the home. Used primarily to evaluate sleep disordered breathing. If the patient sleeps only part of the recording time a HST may fail to diagnose sleep apnea (a normal HST cannot exclude sleep apnea) or significantly underestimate sleep apnea severity. Home sleep testing may be unable to exclude alternative sleep disorders even if the patient slept during a significant portion of the recording time.
Specialized studies are available on request including studies with modification of Split night criteria, studies with the extra limb leads (for investigation of REM behavioral disorder), and full montage EEG studies (for investigation of nocturnal seizures).
Consultation and full evaluation with a Board Certified in Sleep Specialist can be arranged prior to possible testing, or following initial testing, on request.