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Polysomnogram (PSG) is routinely ordered by doctors in order to diagnose a sleeping disorder. Treatment may be able to be initiated during the study for individuals with significant signs of obstructive sleep apnea (OSA). A standard PSG study in one of our labs includes the following: 

 


  • EEG (Electroencephalogram) – monitors brain activity to identify sleep stages
  • EOG (Electrooculogram) – records eye movement
  • EMG (Electromyogram) – records muscle activity for monitoring muscle tone as well as body movement, especially the legs for movement disorders
  • EKG (Electrocardiogram) – monitors heart activity
  • Respiratory Airflow – measures airflow from nose and mouth to document respiratory disturbances
  • Respiratory Effort – monitors chest wall and abdominal movement to help determine specific respiratory disturbances
  • Pulse oximetry – records the oxygen saturation level to distinguish changes during respiratory events
  • Snoring – monitors vibration of throat to determine intensity of snoring
  • Body Position - monitors the effect of sleep position on breathing and other sleep disorder episode

Continuous Positive Airway Pressure (CPAP) Titration is a modified polysomnogram (PSG) study that in addition to recording all of the information during a PSG, treatment is given for individuals with sleep apnea. During a CPAP titration, a patient is fit with a CPAP mask and started off at a low starting pressure. As the study progresses and the patient exhibits respiratory disturbances that impact the quality of sleep, the pressure is gradually increased in order to determine the optimal pressure. At the optimal pressure the patient will have minimal respiratory disturbances and snoring. The patient will be able to achieve a much more restful and restorative night’s sleep.

Multiple Sleep Latency Test (MSLT) is a test to determine if excessive daytime sleepiness or narcolepsy is present. A MSLT is typically done following an overnight PSG study in order to rule out any nocturnal disturbances. A MSLT is a series of 4-5 controlled nap sessions approximately 1.5 hours apart. During the nap, the patient is allowed to fall asleep and the doctor is able to determine how quickly the patient falls asleep and what stages of sleep is entered.

A standard MSLT records the following parameters:

  • EEG (Electroencephalogram) – monitors brain activity to identify sleep stages
  • EOG (Electrooculogram) – records eye movement
  • EMG (Electromyogram) – records muscle activity for monitoring muscle tone
  • EKG (Electrocardiogram) – monitors heart activity
Multiple Wakefulness Test (MWT) is a test usually performed to check CPAP compliance or to ensure optimal treatment of sleep apnea. This test is most commonly requested by doctors for patients who are required to have a CDL license renewed by the Department of Transportation (DOT) or another agency that has their employees operating large equipment. A MWT is a series of 4controlled sessions approximately 1.5 hours apart. During the session, the patient sits upright in a darkened room and tries to remain alert. The parameters recorded will help determine the patient’s level of alertness.

A standard MWT records the following parameters:

  • EEG (Electroencephalogram) – monitors brain activity to identify sleep stages
  • EOG (Electrooculogram) – records eye movement
  • EMG (Electromyogram) – records muscle activity for monitoring muscle tone
  • EKG (Electrocardiogram) – monitors heart activity