PSG, Split PSG, CPAP Titration

A polysomnogram (or PSG) is a safe, painless test, which lasts all night and helps us determine the diagnosis of your sleep problem.

When you arrive, a tech will ask you to change into your bedtime clothes and fill out a questionnaire.  After you have completed the form, the tech will then measure and mark your head with a non-toxic washable pen or pencil.  This ensures proper placement of leads (or electrodes).   Then, leads will be placed on your body to measure the items listed below.  Keep in mind that none of the devices used are painful and no needles are involved.

EEG (electroencephalograph):  monitors brain waves to help determine your stage of sleep.

EOG (electrooculograph):  monitors eye movements.

EMG (electromyograph):  monitors limb movements and chin activity.

ECG (electrocardiograph):  measures heart rate and rhythm.

Breathing from your nose and mouth will be monitored by a sensor called a thermocouple or pressure catheter.

Chest and abdominal respiratory effort will be measured by belts placed around your chest and abdomen.

Your oxygen will be monitored by a probe that clips onto the finger.  You probably had this measured the first time you came to the Sleep Center for an office visit.

Hookup takes approximately 45-60 minutes, so you will be in bed about 1-1½ hours after you arrive at the Sleep Center.  The monitoring devices are very sturdy.  If a device gets pulled off, the tech will enter your room to fix it.  Feel free to sleep in any position.    If you have any conditions that would prevent you from sleeping on your back, please let the tech know.

Voice-activated intercom systems are located in all of the bedrooms, so if you need to go to the bathroom or need assistance of any nature, just call out to your tech.

Sleep studies are videotaped to document any relevant behavior during the night.  Once your study is reviewed by the doctor, the videotape is erased.

Your study will end between 6:00-7:00 a.m.  The tech will remove all of the monitoring devices.  This takes 15-20 minutes.  You may take a shower after the devices are removed.  You will be asked to fill out a post-sleep questionnaire about your night at the Sleep Center.

MSLT

A Multiple Sleep Latency Test (MSLT) involves taking a series of naps throughout the day.  If you spent the night prior to the MSLT in the lab for an overnight study, you will simply remain connected to some of the electrodes.  You must change into comfortable clothing for this test (not pajamas).

During each nap opportunity, you are allowed a certain amount of time to fall asleep, then a certain amount of time to sleep.  During the 1 1/2 - 2 hours between naps, you are not allowed to sleep at all.  Your technician will monitor you to make sure you are not sleeping during that time.  You can use this time to read, watch television, etc.

You are not allowed to smoke 30 minutes immediately prior to each nap.  Also, you are not allowed to consume chocolate or caffeine during the day of your study.

Aftr testing is complete, the wires will be removed.  You can change and/or shower before you leave if you desire.  The data from the study will be interpreted by your sleep doctor.