Polysomnography (PSG), also known as a sleep study, is a useful test for the diagnosis of many diseases not necessarily related to sleep. It is a comprehensive recording of the most important biophysiological parameters during sleep.
Polysomnography has various indications. Most commonly is used for the diagnosis of sleep apnea, upper airway resistance syndrome and respiratory effort relate arousals (UARS & RERAs), narcolepsy, periodic limb movement and restless leg syndrome (PLM & RLS), REM behavior disorder and parasomnias.
During sleep study the activity of brain (electroencephalograph, EEG), eye movements (EOG), muscle activity (electromyography, EMG) heart rhythm (electrocardiograph ECG), oxygen saturation, thorax and abdomen movements are monitored. This allows us to extract useful conclusions and set or exclude a diagnosis.