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Video: Sleep-laboratory

Отличия серверных жестких дисков от десктопных
Video: Your Night in the Sleep Laboratory 2023, January

Sleep laboratory (polysomnography)

Inpatient polysomnography (PSG) is performed in the sleep laboratory and used to diagnose sleep disorders. It is a comprehensive process.

With their help, sleep can be analyzed. It can provide information on interruptions in sleep, pathological changes and causes impairing sleep (e.g. organic problems and diseases, breathing pauses, movement disorders).


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For this purpose, various functions of the body are recorded during nightly sleep and then evaluated. Brain activity, eye movements, muscle activity, heart rhythm, leg movements, breathing movements, body position, breathing flow, breathing sounds (snoring) and oxygen saturation of the blood are measured.

In advance, an outpatient measurement (outpatient polygraphy) of certain functions can be carried out (e.g. pulse rate, blood oxygen saturation, breathing movements and breathing flow). This is done overnight at home using a small device.

What happens in the sleep laboratory?

In polysomnography, electrodes or sensors that are attached to certain points on the body are used to record “information” and transmit it to special devices. These signals are amplified, graphically processed, recorded and then evaluated. A so-called polysomnogram is created. In a separate room, personnel trained in sleep medicine monitor your sleep and the recording. The sleeping patient's room is separate from this. Polysomnography is painless.

For example, brain waves (using EEG), eye movements (using EOG) and muscle tension (using EMG) are recorded. Other bodily functions such as breathing effort and air flow to the mouth and nose can also be monitored. The oxygen saturation of the blood is checked on the earlobe or index finger. During polysomnography, continuous positive pressure ventilation can be carried out using CPAP devices. Either the nose or the mouth and nose are covered with a mask. This procedure is used to treat sleep-related breathing disorders.

What preparations are necessary?

Before the polysomnography, you will be given information on the process and what to bring with you. Open questions can be clarified. The handling of the electrodes or sensors, the cabling and CPAP masks is explained.

Some drugs affect sleep. You should therefore inform the attending physician about your medication intake. He / she should also know about taking over-the-counter products. In some cases, drugs are discontinued after consulting a doctor and under medical guidance. Most of the time, illnesses, nutritional and lifestyle factors and medication intake are already known. Polysomnography is preceded by doctor-patient discussions and various examinations.

In principle, you need similar luggage for the night in the sleep lab as for overnight stays outside your apartment / house (e.g. when you go on vacation). You will also receive information about this. You should refrain from alcohol, caffeinated drinks (e.g. coffee, black tea, cola) and other stimulating drinks etc. on the day of the examination after 2 p.m. Come to the PSG with freshly washed hair so that electrodes adhere well to the head. Avoid using hair styling and hair care products (e.g. spray, gel, etc.).

How does the PSG work?

After you have got ready for sleep, electrodes or probes are attached to the body and adjusted. You will lie in a single room overnight. Important functions of the body as well as movements etc. are recorded. In a separate room, a doctor will monitor your sleep and the recording.

In the morning the electrodes / probes are removed again, the results are evaluated and discussed in a separate appointment. The further course of action and therapy is determined. The diagnosis may require polysomnography for several nights. In addition, a subsequent examination during the day can be carried out (multiple sleep latency test). In this case, the tendency to fall asleep is examined under EEG control.

What are the side effects / complications?

Polysomnography is an unfamiliar situation. Any non-functioning electrodes etc. can be noticed quickly, as medical specialists are constantly present in the separate (control) room during polysomnography. The patient's freedom of movement is maintained despite electrodes / sensors. Nocturnal movements are hardly affected.

Where is a PSG held?

Polysomnography is done in sleep laboratories. These are integrated into departments of hospitals or clinics (e.g. internal department, neurology, pulmonology, etc.). You can find an overview of sleep laboratories in Austria on the website of the ÖGSM (Austrian Society for Sleep Medicine and Sleep Research).

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