Also known as polysomnography, sleep studies are tests used to help in the differential diagnosis of sleep disordered breathing. Several parameters are evaluated for the patient being tested for sleep disorder; these include cardiac rate and rhythm, chest and abdominal wall movement, nasal and oral airflow, oxygen saturation, muscle activity, retinal function, and brain activity during the sleep phase.
Procedure And Posttest Care
A normal sleep study shows a respiratory disturbance index (or apneahypopnea index) of fewer than 5 to 10 episodes per study period and normal electrocardiogram (cardiac rate and rhythm), impedance (chest and abdominal wall motion), airway (nasal and oral airflow), arterial oxygen saturation (oximetry), leg electromyogram (for muscle activity), electrooculogram (for retinal function), and EEG (for brain activity).
Abnormal recordings reveal obstructive sleep apnea syndrome. Abnormal movement during sleep indicates a seizure or movement disorder.
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