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Polysomnography Sleep Test

Dream Interpretation

Definition of Polysomnography (PSG)
When a patient feels that they have some sleeping problems or sleep disorders they may consult a doctor, health practitioner or specialist for diagnosis. To confirm an initial diagnosis the patient may be referred to a sleep clinic for a Polysomnogram sleep study or sleep test. A sleep test is used as a diagnostic tool in sleep medicine.

A Polysomnography (PSG) test is the most common multi-parametric test used in the study of sleep. The word Polysomnography is derived from the Greek word 'polus' for "many, much", the Latin word 'somnus' meaning "sleep" and the Greek word'graphein' meaning to write "to write". Approximately 50 - 70 million Americans are reportedly affected by Sleep Deprivation.

What does a Polysomnography sleep test do?
A Polysomnogram sleep test measures sleep cycles and stages of sleep and monitors and records the following elements:

  • Sleep patterns and stages
  • Blood oxygen levels
  • Body position
  • Brain waves (EEG)
  • Breathing rate
  • Electrical activity of muscles
  • Eye movements
  • Leg movements
  • Heart rate

Why the Polysomnography Sleep Test is conducted
Sleep studies or tests are conducted to confirm and gain additional information about a patient's sleep problems. A Polysomnogram might be used to confirm or detect any of the following conditions:

Obstructive Sleep Apnea
Central Sleep Apnea
Insomnia
Narcolepsy
Periodic limb movement disorder (PLMD)
Excessive daytime sleepiness (EDS)
Hypersomnia
REM sleep disorder

How the Polysomnography Test is performed
A polysomnogram sleep study will typically record a minimum of 11 channels requiring a minimum of 22 wire attachments to the patient. Electrodes are attached to the chin, the scalp and the outer edge of the eyelids. Monitors attached to the chest record the heart rate and breathing.

Polysomnography Results
The results of the Polysomnography test are interpreted by the specialist doctor who writes a report which is sent to the referring physician. The results usually contain specific recommendations based on the test results. For example if Obstructive sleep apnea was evident then the use of a CPAP nasal breathing mask covering the nose and mouth might be recommended.

This information regarding sleep and sleeping disorders is not intended to replace the advice of a doctor. Dream Interpretation.org.uk disclaims any liability for the decisions you make based on this information.

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