An Electroencephalogram (EEG) is a test that measures electrical activity in the brain. The brain cells communicate with each other using electrical impulses. This brain activity is recorded by an EEG in the form of wavy lines. Any abnormality in the brain activity is also detected by an EEG.
During the procedure, electrodes consisting of small metal discs are attached to the scalp. These electrodes detect the electrical charges that result from activity of the brain cells. These charges are recorded and appear as a graph on a computer screen. These can also be printed on paper for better interpretation by the healthcare provider.
An EEG test is done to detect changes in brain activity that might help in a brain disorder diagnosis. In cases of epilepsy, seizure activity appears as rapid spiking waves on the EEG. In lesions of the brain due to tumour or stroke, EEG may show unusually slow waves.
An EEG might also help in diagnosing conditions like brain dysfunction, brain injury, sleep disorders, Alzheimer’s disease and encephalitis.
An EEG causes little or no discomfort. The entire procedure takes around 30-40 minutes and patient is asked to relax in a comfortable position with eyes closed during the test. To begin with, a technician measures the head and makes markings on the scalp at spots where electrodes would be attached. The electrodes are attached with an adhesive tape or are fitted in an elastic cap that is placed over the patient’s head. The electrodes are connected with wires to a device that amplifies the brain waves and records them on a computer. Several times during the test, the patient is asked to breathe differently, look at a flashing light or open and close eyes. A video recording captures the body motion during the test. This combined with the recording of the brain waves helps the doctor in diagnosing and treating the condition.
Results of an EEG are analyzed and interpreted by Electroencephalogram specialists who share the results with the neurologist who had requested the test. Based on the results of the test, the neurologist decides the further course of treatment and if the test needs to be repeated. Kokilaben Dhirubhai Ambani Hospital, Indore is one of the well-equipped EEG centre in Indore.