Sleep Studies
Polysomnograms (nPSG)
A nocturnal sleep study, or polysomnogram, is a recording that measures various physiologic parameters used to identify sleep stages and possible sleep disorders. The activities recorded during sleep include brain waves (EEG), eye movements, muscle activity (EMG), heart rate, and snoring. The application of small electrodes and sensors are used to record this information into a computer for later analysis. Generally, patients arrive approximately 2 hours before their “usual” bedtime to prepare for their study. Testing usually lasts from 8 to 10 hours.
Multiple Sleep Latency Test (MSLT)
Patients may undergo an additional test called an MSLT. This test is generally performed in the morning after a full night polysomnogram. This means that patients will need to remain at the center for most of the next day. This test consists of a series of brief naps at 2-hour intervals. The MSLT is designed to evaluate the degree of daytime sleepiness and fatigue in subjects referred to the center.
Titration Studies (CPAP/Bi-Level)
Nasal continuous positive airway pressure (nCPAP) is the most commonly utilized treatment for obstructive sleep apnea. A standard CPAP unit delivers constant airflow during inspiration and expiration through a small nasal mask. Some patients may not tolerate standard CPAP and may benefit from a bi-level sleep study. Bi-level units often improve compliance because of the reduced pressure used during expiration.
