Polysomnography refers to the study of brain function during sleep. It is commonly associated with the study of altered breathing during sleep.
Sleep is varies a lot depending on age, but only one goes through 4-6 cycles of sleep each night. This cycle consists of the shallow bed, and then sleep later in REM sleep. While developing the night, tended more and more deep and REM sleep, which is why you are in the middle of a dream when your alarm clock goes off. REM sleep is a strange country – your dreams, but your brain makes your whole body go floppy, except for your eyes blink back and forth (rapid eye movement). As people get older, they need less sleep and their sleep is fragmented practice.
The reason is mostly to look for obstructive sleep apnea (OSA). It is a condition that is a weakness in the back of the throat. The weakness usually occurs when the back of the throat as a result of the closing muscles in the palate and pharynx becomes weak, something that is often, but not always, associated with aging. Often being overweight makes it worse and are often triggered by alcohol before bed. When severe enough, the oxygen in the blood drops due to blockage in the throat. When the oxygen level drops, breathing muscles begin to tense, which eventually leads to a short gasp, related to the so-called passion (second half awake).
Repeated after rotation by a decrease in oxygen, breathing heavily, passion, cessation of breathing, decreased oxygen, etc, etc. .. It has a profound effect on the normal sleep cycle. This means that patients with OSA and hold up for a breath of air, spend less time in deep sleep and very little time in REM sleep. Important severe OSA means that someone has woken up every hour throughout the night. This naturally leads to poor concentration and lethargy and a number of important medical conditions, including headaches and high blood pressure.
Narcolepsy is a condition in which polysomnography can be requested. It is a condition that is typically lost control of REM sleep. The result is that people with narcolepsy may feel very sleepy during the day, they may even experience a dream fragment, as well as other aspects of REM sleep, such as a sudden feeling of paralysis. Along with the busy movement sleep periodic leg (leg kicks while repeatedly), and disruption of REM sleep behavior, in which the patient may act out their dreams.
How polysomnography done?
Polysomnography in a sleep laboratory completed special. Patients came to the laboratory in the afternoon and connected with a number of electrodes. Since learning that took all night, the electrodes must be held firmly in place and therefore are usually fixed with glue (with acetone). In obstructive sleep apnea electrodes placed around the eyes, under the chin and on the scalp to help determine the stage of sleep.
The band usually placed around the chest and abdomen to monitor breathing and a small device to measure airflow placed near the nose. Finally, an oxygen meter attached to the finger or ear to monitor any decrease in oxygen during the study. Once the study is underway, and if obstructive sleep apnea is clear, a mask CPAP (continuous positive airway pressure) is placed on the face, and the pressure required to overcome the weakness can then be recorded. Some laboratories prefer to do it separately and book a second night to assess the CPAP pressure. It is important to establish the correct CPAP pressure machine for when the patient is at home.