Get Tested for Sleep Disorders
At Great River Health System, we offer a variety of sleep tests to diagnose
sleep disorders. Below you will find a brief overview of the tests we
perform and what you can expect as a participant. If you have a sleep
disorder, overnight sleep testing is the most effective diagnostic tool
we have. We will do all in our power to ensure your stay is comfortable
so that we can more quickly diagnose your condition and start treatment.
Out Of Center Sleep Testing (OCST)
Patients who have specific criteria and are suspected of having obstructive
sleep apnea may qualify for an out-of-center sleep study. Patients who
qualify for this test will be allowed to wear small monitoring devices
while sleeping in the comfort of their homes. Education and equipment
are provided the day of the test. Patients then apply monitors with sensors
at bedtime while getting their typical night sleep in their homes. The
next morning, the patient must return the monitoring device so the data
can be downloaded and prepared for physician interpretation.
A Polysomnogram or “Sleep Study” is a multi-parametric test
used to study sleep and as a diagnostic tool in sleep medicine. A sleep
study is a noninvasive approach to monitor several aspects of a patient’s
typical night’s sleep. A PSG is often considered the gold standard
for the diagnosis of Obstructive Sleep Apnea (OSA) and evaluating various
other sleep disorders. There are three commonly ordered PSG’s and
one pediatric PSG:
Standard Polysomnogram – This is a routine diagnostic sleep study. A Split Night Polysomnogram will
be performed as long as you meet the criteria for treatment during your
Standard PSG. The criteria will be explained prior to your testing.
Split Night Polysomnogram – Patients coming for an overnight polysomnogram may be diagnosed and qualify
for treatment in the same night. The Sleep Disorders Center staff will
explain the guidelines for qualifying for treatment prior to you going to sleep.
CPAP Titration – Patients who have a previous diagnosis of OSA may be treated with Continuous
Positive Airway Pressure (CPAP) depending on the severity of their apnea.
CPAP is the standard treatment for moderate to severe OSA.
Pediatric Polysomnogram – A pediatric polysomnogram is an overnight sleep study for patients between
the ages of 6 and 12 years old. All routine polysomnogram parameters will
be monitored while in a child friendly environment. Parents or a legal
guardian are required to stay for the duration of the test. Pediatric
patients will be required to have a diagnostic polysomnogram performed
before treatment can be initiated.
Multiple Sleep Latency Test (MSLT)
A Multiple Sleep Latency Test is a daytime test that typically follows
an overnight sleep study. This test monitors sleep architecture and how
quickly patients fall asleep. Since people with narcolepsy frequently
have REM (dreaming) sleep even during a brief nap, this test can be a
valuable tool to aid in the diagnosis. The test consists of taking four
to five 20-minute naps that are spaced out in two hour intervals. Patients
are allowed to wear daytime clothing and will be provided meals throughout
the day of testing. Patients are encouraged to bring activities to keep
them busy between the scheduled naps.
Maintenance of Wakefulness Test (MWT)
A Maintenance of Wakefulness Test is a daytime test that measures your
ability to stay awake. The test may be used to assess daytime alertness
while on the job or your response to treatment of various sleep disorders,
such as sleep apnea or narcolepsy. The test typically begins one and a
half to two hours after your normal wake up time and consists of four
to five 40-minute periods in which you will be asked to sit in a dimly
lit room and remain awake and alert. If the patient falls asleep during
the 40 minute trial, testing will be stopped until the next scheduled
trial. These 40 minute testing periods will be in 2 hour intervals, so
plan on spending at least 8 hours at the Sleep Disorder Clinic.
A Positive Airway Pressure Nap (PAP Nap) is an outpatient test which is
used to desensitize patients to positive airway pressure such as CPAP
or BiPAP. This nap study is intended for patients who suffer from insomnia
and sleep-disordered breathing (SDB) and are still experiencing discomfort
or resistance to their treatment.
Preparing For a PAP Nap:
- Please wake up 3 hours earlier than your normal wake time.
- No napping prior to your PAP Nap
- Do not consume caffeine the day of or the night prior to your test.
- Arrange for a ride to and from your test to decrease the risk of drowsy driving.
- Eat your breakfast and lunch prior to arriving to your appointment.
- Wear comfortable clothing and bring your CPAP/BiPAP mask with you.
During the test, will monitor your: breathing effort, heart rate, pulse
oximetry, body position and video monitoring. The staff will work with
you to make sure your mask is fitting properly prior to you laying down
to rest. Comfort measures and desensitization techniques will be utilized
by the staff to make your transition to positive airway pressure more
comfortable. You will be allowed to rest for one to two hours or until
you feel more comfortable using your PAP mask.