Sleep Study (Polysomnography)
In-lab tests are the most accurate way of assessing a sleep condition. A polysomnography (PSG) is an in-lab test performed at our state-of-the-art sleep center. The sleep study is an over night test used to diagnose patients with sleep disorders such as sleep apnea, restless leg syndrome, narcolepsy.
The study helps the physician determine the best course of treatment for the patient.
What to expect during the polysomnography (PSG) sleep study
During the polysomnography (PSG) study the sleep technician places sensors on the skin of the patient’s head, face, chest and legs. The sensors are connected to a computer by wires and enables the sleep technician to monitor the patient while they sleep throughout the evening.
The patient’s eye movement, breathing patterns, oxygen level, brain activity and heart rate are all monitored throughout the study.
During the study activity called events are monitored using the Apnea–Hypopnea Index. Patients are given a score that calculates the number of apnea (pauses in breath) and hypopnea (shallow breathing or low respiratory rate) events throughout the evening against the number of hours of sleep. Scores are given as follows and treatment is tailored accordingly.
- Normal: 0-4
- Mild sleep apnea: 5-14
- Moderate sleep apnea: 15-29
- Severe sleep apnea: 30 or more
Other events monitored throughout the PSG study include brain activity, eye movements and heart rate. The patient’s breathing patterns, oxygen level, and body movements are also monitored.
Not all patients have a good night’s sleep during the study, however a complete nights sleep is not necessary to gather all the required data.