Question:     What is a polysomnograph or PSG?

Question:     What is a polysomnograph or PSG?

A polysomnograph is the graphical recording made by using a special machine and software to record certain body and brain functions to determine your sleep stages and what is happening during your sleep period.

That is a very simplistic answer to a complex question.  Here is what happens:

After you arrive at the test site or sleep lab, you will be prepared for the test.  Electrodes will be attached to your scalp and body by a technician trained in polysomnography.  The electrodes will send an electronic signal to the PSG computer software.  That signal will show up on the computer monitor in the form of a graph so the PSG Tech can monitor the test.  With the exception of the scalp electrodes, the electrodes are very similar to those used in and EKG or EEG.  The scalp electrodes are a small cup type electrodes that are attached with a special pharmaceutical grade glue, similar to airplane glue, called colodian.  After the electrode is firmly attached the cup portion is filled with a special conductive gel.  This gives a positive connection with the skin of the scalp so that brain wave emissions can be tracked.

In all, 16 to 20 electrodes are attached to you body.  Four electrodes receive the brain waves.  Two more are grounds to complete circuitry. Two measure eye movement.  One measures chin movement, one measures vocalization, one measures thorasic movement, one measures abdominal movement, two measure leg movement, one measures breathing effort and one measurers blood oxygen saturation.

With the information supplied to the software program the technician and physician can determine if you have sleep apnea or one of the other 79 sleep disorders.  With the results of the PSG and proper treatment, your life can be turned around.  You can regain the energy you had 20 years ago.

You can see all our sleep disorder equipment on our website at cpapman.com.

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