Types of Sleep Studies

Diagnostic Polysomnography (PSG)
Diagnostic Polysomnography (PSG Adult and Pediatric) is performed to document physiological events occurring during sleep. The test consists of a continuous recording, generally lasting from 6-8 hours and occurring during a patient’s typical sleep hours. The gold standard parameters that we monitor include limited electroencephalogram (EEG) (central & occipital), eye movement and muscle tone (EMG) for the purpose of staging sleep, respiratory effort by chest and abdominal movement, nasal and oral airflow, limb movements, limited electrocardiogram (ECG) and oxygen saturation by non-invasive pulse oximetry. The patient’s sleep behavior is also monitored using infrared lighting and a closed circuit camera. Additional parameters are available upon request and may include end-tidal CO2.

Continuous Positive Airway Pressure (CPAP) Titration
Continuous Positive Airway Pressure (CPAP) Titration is performed while the patient is breathing on CPAP in an effort to eliminate respiratory events occurring during the patient’s sleep. CPAP is initiated and is titrated upward until respiratory events, sleep arousals, and snoring are eliminated.

PSG With CPAP Therapy Trial (Split Night)
PSG with CPAP therapy trial (Split Night) is a combination test incorporating both a diagnostic PSG and a CPAP titration over the course of one night. The apneahypopnea index (AHI) must meet or exceed insurance carrier requirements during the diagnostic portion of the study; which may vary by insurance carrier. The parameters monitored include those recorded in the diagnostic PSG with the addition of CPAP levels during the therapy trial. CPAP therapy may be initiated at lower AHI levels upon the physician’s request; however, in these cases caution must be taken to meet specific payor guidelines to justify CPAP rental coverage at home.

Multiple Sleep Latency (MSLT)
Multiple Sleep Latency (MSLT) is performed to provide objective documentation of daytime sleepiness and to definitively diagnose narcolepsy. This test is routinely performed following a diagnostic PSG to ensure there are no significant disruptions during the preceding night of sleep that contribute to sleepiness during the testing process. Urine drug screens are also performed to ensure sleepiness is not artificially induced. The testing includes limited EEG (central & occipital), eye movement, muscle tone for the purpose of staging sleep, and an ECG. The patient is recorded during 4 to 5 nap opportunities occurring every 2 hours lasting approximately 20-30 minutes following the PSG. Sleep behavior is also monitored using infrared lighting and a closed circuit camera.

Maintenance of Wakefulness Test (MWT)
Maintenance of Wakefulness Test is performed to document the patient’s ability to maintain wakefulness during 4 to 5 twenty-minute periods evenly spaced throughout the day in which he/she is monitored while sitting in a dark, quiet room without stimulation. The parameters monitored are the same as those for the MSLT. This test is often used to measure treatment effectiveness.

Comments are closed.

Designed by NSJ