Glossary Index

Sleep Study

Sleep studies are tests that record what happens to your body during sleep. the studies are done to find out what is causing your sleep problems. Sleep problems include:

SLEEP APNEA, when an adult regularly stops breathing during sleep for 10 second or more. This may be caused by blocked airflow during sleep, such as from narrowed airways. Or it may be caused by a problem with how the brain signals the breathing muscles to work.

Problems staying awake, such as NARCOLEPSY.

Problems with nighttime behaviors, such as SLEEPWALKING, NIGHT TERRORS, or bed-wetting.

Problems sleeping at night (INSOMNIA). This may be caused by stress, DEPRESSION, HUNGER, physical discomfort, or other problems.

Problems sleeping during the day because you work at night or do rotation shift work. This sleep problem is called shift work sleep disorder.

Conditions such as PERIODIC LIMB MOVEMENT DISORDER, which is repeated muscle TWITCHING of the feet, arms, or lets during sleep.

SLEEP STUDIES can also determine whether you have a problem with your STAGES OF SLEEP. the tow stages of sleep are non-rapid EYE movements (NREM) and rapid eye movement (REM). Normally, NREM and REM alternate 4 to 5 times during a night's sleep. A change in this cycle may make it hard for you to sleep.

There are four kinds of sleep studies, including:

1. DIAGNOSTIC OVERNIGHT PSG: General monitoring of sleep and a variety of body functions during sleep, including breathing patterns along with oxygen levels in the blood, heart rhythms, and limb movements.

2. DIAGNOSTIC DAYTIME MULTIPLE SLEEP LATENCY TEST (MSLT):The MSLT is used to diagnose narcolepsy and to measure the degree of daytime sleepiness. It measures how quickly you fall asleep in quiet situations during the day. It also monitors how quickly and how often you enter REM sleep. To ensure accurate results, it is performed on the morning following a diagnostic overnight PSG.

3. TWO-NIGHT EVALUATION PSG AND CPAP titration: CPAP (continuous positive airway pressure) is a sleep apnea treatment that involves the delivery of air into the airways through a specially designed nasal mask. On the first night of the two-night protocol, general monitoring and diagnostic evaluation is conducted. If sleep apnea is discovered, the patient returns for a second night to determine the necessary CPAP pressure required to alleviate apnea.

4. SPLIT-NIGHT PSG WITH CPAP TITRATION: Split-night PSG is conducted when moderate or severe sleep apnea had been discovered or strongly suspected during the first part of the night's study. The second half of the night is used to determine the necessary CPAP pressure required to alleviate apnea.

S.A.V.E. (Stroke, Aneurysm, & Vascular Exam)

This screening exam includes three individual tests - ultrasound of the neck, ultrasound of the abdomen, and assesses blood pressure in your legs (known as an ABI - ankle/brachial index). The results allow you and your physician to assess your risks and make lifestyle and dietary adjustments to prevent any further or future vascular disease. There is no physician's order required for this screening exam.