Electroencephalogram, Brain wave test
The electroencephalogram (EEG) is often a test to detect problems within the electrical activity in the brain. Electroencephalography (EEG) would be the recording of electrical activity across the scalp. EEG voltage fluctuations caused by ionic current measures current inside neurons of the brain. In clinical contexts, EEG refers on the recording of this spontaneous electrical activity of the brain in a brief period of time, usually 20 to be able to 40 minutes since recorded from multiple electrodes designed into the scalp. Diagnostic applications typically target the spectral content of EEG, that is, the type regarding neural oscillations that may be observed in EEG signals.
EEG is most often used to analyze disorders in the central Nervous System, which will cause abnormalities in EEG blood pressure measurements. It is also helpful to diagnose sleep disorders, coma, and also brain death. EEG used as a first-line method regarding diagnosis of tumors, strokes and additional focal brain disorders, but this make use of has declined with the advent of anatomical imaging techniques with high resolution such as MRI and also CT. Despite this limited spatial solution, EEG continues becoming a valuable tool regarding research and examination, especially when temporal selection of millisecond resolution is required.
How the test is conducted
Brain cells communicate with one another by producing tiny electrical impulses. In a EEG, the electric powered activity is calculated by putting electrodes around the brain. The test is conducted by EEG technicians. You will be asked to lie with your back on some sort of bed.
The technician will certainly apply between 16 and 25 electrodes in various positions on ones brain. The electrodes are held constantly in place with a sticky substance. The electrodes are connected by wires to an amplifier and some sort of recording machine.
The recording equipment converts the electric powered impulses into patterns that may be seen on a pc screen, as well as stored on a computer disk. Just before computers, the activity was printed on paper. In either circumstance, the electrical exercise looks like a few wavy lines. You simply must lie still along with your eyes closed because any movement can adjust the results. You will be asked to carry out certain things during the recording, such as to breath deeply and rapidly for a few minutes or look for a bright flashing for a while.
How to get ready for the test
You simply must wash your hair the night time before the examination. Do not work with any oils, sprays, or conditioner with your hair before this kind of test.
Your medical doctor may want someone to stop taking certain medications before the test. Do not modify or stop medicinal drugs without first talking to your health care provider.
You should stay clear of all foods containing caffeine for 8 hours before the test.
Sometimes it's important to sleep during the test, so you may be asked to reduce your sleep time the night time before. If you're questioned to sleep as little as possible before this test, don't eat any caffeine, electricity drinks, or other products that help you stay awake.
What sort of test will sense
This test reasons no discomfort. Although having electrodes pasted on your skin may sense strange, they only record activity and produce any discomfort. No significant electricity passes from your electrode into your epidermis.
Brain electrical exercise has certain frequencies (the number of waves per second) which are normal for different levels of consciousness. For instance, brain waves are faster when you're awake and slower when you are sleeping. There may also be normal patterns for you to these waves. These frequencies and also patterns are what exactly the EEG reader looks for.
The procedure is very risk-free. However, the flashing lights or fast inhaling and exhaling (hyperventilation) required during the test may bring about seizures in those that have seizure disorders. The health care provider performing this EEG is well trained and manages you if this kind of happens.