• Deckchairs
  • An European Medical Association Approved Facility

PSG sleep Studies

Services for Sleep Management Center

PSG Sleep Studies

The gold standard of diagnosis of sleep disorders: Polysomnography (PSG)


There are many types of sleep studies possible. It is important to do the appropriate test to correctly diagnose sleep disorders. Our Clinic is able to offer all levels of sleep studies appropriate to the patient and the Sleep Disorder.

LEVEL I: In-lab supervised study - The most sophisticated and detailed study possible :

PSG sleep Studies
  • 2 channels each of EEG, EMG (submental & tibialis), & EOG
  • Respiratory effort
  • Respiratory airflow
  • Oximetry
  • ECG
  • Body position
  • Snoring


LEVEL II: unsupervised study. This is the most important test for diagnosis for Sleep Related Breathing Disorders and snoring. This test should include :

Level 2 PSG Studies
  • 2 channels each of EEG, EMG (submental & tibialis), & EOG
  • Respiratory effort
  • Respiratory airflow
  • Oximetry
  • ECG
  • Body position
  • Snoring






LEVEL III: unsupervised study - This has 4 criteria - snoring, respiratory effort, position gyroscope & oximetry :

Level 3 PSG Studies



This test is commonly performed, with the advantage that it is inexpensive, and has a good clinical correlation for AHI > 20, but the problem is: it measures AHI per hour in bed, not per hr of sleep. This gives rise to false readings when the patient is not sleeping well, and is MOST UNRELIABLE when contemplating surgery or CPAP use. This test should be done only as a follow-up.




LEVEL IV: unsupervised study :

Level 4 PSG Studies

  • Peripheral artery tonometry (watch-PAT)
  • Apneagraph - fairly reliable test for site-of-obstruction, and is the only test that can document the site of obstruction.
  • This involves the use of a pressure sensing tube which is swallowed by the patient overnight.
  • However, none of the above involves measuring the quality of sleep, so these are not good tests for determining the degree of sleep apnea. They are only useful as additional tests to a good level 2 PSG.


SLEEP ENDOSCOPY :

Sleep Endoscopy

This involves performing a flexible fibre-optic endoscopy while the patient is asleep. The advantage of this test is the visualisation of the precise site of snoring and apnea production with pin-point accuracy. We perform BIS-monitored sleep induction. This is a world class method to ensure that the diagnosis of the airway obstruction is done when the patient is in a state closest to natural sleep.