About Polysomnogram Sleep Apnea Test

By on September 17, 2013

About polysomnogram:

Polysomnogram Sleep ApneaPolysomnography is called as a sleep study that is used to diagnose sleep disorders like sleep apnea, narcolepsy, restless legs syndrome and other sleep disorders. If you have symptoms of sleep apnea, the most commonly used test in the diagnosis is polysomnogram sleep apnea.

Sleep apnea is a type of sleep disorder characterized by recurring episodes of apnea and also reduced inspiratory airflow due to upper airway obstruction during the sleep. Generally, OSA is suspected because of some common symptoms such as loud snoring, daytime sleepiness, restless sleep, fatigue, etc.

It is a painless, non-invasive test that requires an overnight stay at a sleep center in which you will be monitored and evaluated by sleep experts while you sleep. The sleep study test is done during the night in order to study sleep patterns.

The polysomnogram sleep apnea is done by sleep doctor to record the following:

  • Brain waves
  • Heart rate
  • Blood oxygen level.
  • Breathing rate
  • Sleep stages and cycles
  • Snoring and other noise you may make when you sleep
  • Eye and leg movements during the study

How you prepare:

During this test, your doctor may give some instructions, including:

  • Keep a regular sleep-wake rhythm.
  • Do not drink alcohol and caffeine before polysomnography because alcohol and caffeine may change your sleep patterns.
  • Avoid naps on the day of sleep study.
  • Prevent strenuous exercise on the day of the PSG.
  • Avoid sleeping pills and stimulants.

Polysomnogram test:

Polysomnogram technologist places small and thin electrodes and other sensors on your scalp, temples, chest and legs using a glue or tape. These sensor wires are connected to a computer to monitor you throughout the night.

A small clip is also placed on your fingers that help to record the level of oxygen in your blood. Sleep doctor also connects additional systems to polysomnogram sleep apnea test equipment such as:

  • Electrooculogram (EOG): This records the eye and leg movements.
  • Electroencephalogram (EEG): This helps to record the brain waves.
  • Electromyogram (EMG): This records the muscle activity.
  • Electrocardiogram (ECG): This records the heart rate and rhythm.
  • Nasal airflow sensor to record airflow.
  • Snore microphone to record snoring activity.

Your doctor also connects other equipments that help to record the signals related to:

  • Records airflow from the nose and mouth.
  • Blood oxygen level.
  • Snoring and other noise you make when you sleep.
  • Breathing pattern.

All of these measurements are recorded on a continuous graph.

After your polysomnogram sleep apnea:

In the morning, your sleep technologist will remove all the sensors and electrodes, and you may leave the sleep center. You are given a scheduled visit for a follow-up visit with your doctor who recommended the test.

During your follow-up appointment, you will obtain your sleep study results and have an opportunity to ask your doctor any questions about your sleep study. The records are analyzed by a qualified sleep doctor to determine whether you have sleep apnea or other type of sleep disorder.