What is a VEP test?
Evoked potential test in New York is a method of recording the reactions of various structures of the brain to external stimuli (auditory, visual and somatosensory), which makes it possible to determine the state of the nerve pathways, the pathways of deep sensitivity (vibration sensitivity, feeling of pressure, muscular-articular feeling) and to study the work of the autonomic nervous system.
The use of Evoked Potential Tests is an invaluable tool for early detection and prognosis of neurological disorders in various diseases, such as:
- brain tumors;
- consequences of traumatic brain injury;
- multiple sclerosis and others.
On average, the study takes from 30 minutes to an hour.
The purpose of Visual evoked potential test
Generally, the examination in Advanced Sleep Care is conducted for a number of reasons:
- identifying the level of damage to the nervous system;
- determining the prevalence of the process;
- determination of the nature of the defeat;
- determination of the severity of the pathological process;
- assessment of the prognosis of the disease, clarification of the diagnosis, control of the effectiveness of treatment.
What else can be identified with Evoked Potential Tests?
While going through Evoked potential test in New York there is an opportunity to conduct other important studies:
- Auditory evoked potentials. This technology enables to determine the level and nature of damage to the auditory and vestibular system along its entire length from ear receptors to the cerebral cortex. Evoked potential is indicated for vestibular disorders (dizziness, impaired coordination, etc.), early diagnosis of demyelinating illnesses and neuroma of the auditory nerve, hearing loss, tinnitus. The method is also useful in examining patients with pathology of ENT organs (otitis media, otosclerosis, sensorineural hearing loss).
- Visual evoked potentials. The method allows you to determine the presence or absence of damage from the retina to the cerebral cortex. The examination helps in the differential diagnosis of degenerative lesions of the visual tract, multiple sclerosis, retrobulbar neuritis, with pituitary adenoma, decreased vision, etc. Also, VEP test can determine the prognosis of visual impairments in diseases such as glaucoma, temporal arteritis, diabetes mellitus, optic nerve injury to name but a few.
- Somatosensory evoked potentials. Evoked potential test in New York allows examining the state of the sensitive system from the receptors of the skin of the hands and feet to the cerebral cortex. It is used to diagnose multiple sclerosis, funicular myelosis, polyneuropathies, various disorders, injuries of the nerve plexuses, peripheral nerves, spinal cord.
- Cognitive evoked potentials. The examination is shown for the assessment of cognitive disorders in the clinical and preclinical stages, the dynamics of cognitive impairments during treatment. It is used to identify the severity of dementia of various origins and early preclinical detection of cognitive impairments, for example checking the brain function in children with problems of behavior, attention, learning. The method is also used in professional selection and assessment of side drug effects. It is used in both adults and children.
How to prepare for an evoked potential study?
On the day of Visual evoked potential test, it is necessary to follow several recommendations from our specialists:
- stop taking vascular drugs and tranquilizers, as they can distort the results of the examination;
- don’t use chemicals;
- have a good sleep before testing.
It’s prohibited to have pathological processes on the skin during examination. Relative contraindications include the presence of epilepsy, mental disorders, severe angina pectoris or hypertension, as well as a pacemaker.
- What is an evoked potential test used for? The brain is the main reactor to exterior provocateurs and inner processes, it manages the body through the nerve pathways but first, this part gets information because of impulses. An evoked potential test records the responses of the organism engine to stimuli and reveals nervous system disorders. This examination checks the state of sensations therefore it determines stroke, multiple sclerosis, brain tumors. Such an instrument is effective for making the diagnoses more accurate because it shows the damages of the optic nerve, depicts brain activity, feeling of touch, vision, hearing, and muscular-articular sensitivity. An evoked potential test can find out the type of the illness and predicts the way of its development and whether the curing works positively on the shutdowns. People after traumatic brain injury see the spread of the process. The affirmative sign of this study is the opportunity to point to the exact place where the disorder appeared.
- Is evoked potential test painful? The basic device for the evoked potential test is electrodes. A doctor fixes these patches on the head of a patient and to other parts. The process is fully safe and that is true that a person can feel a bit uncomfortable but it doesn’t hurt. The instruments track brain activity and transmit the result on the computer screen. The causes of unpleasant sensations are visual triggers such as flashing or bright light during a couple of minutes. The auditory type of the test uses hearing irritators, for instance, clicks or tones. And the SER that checks the speed of passing the signals through nerves is able to become the reason for inconvenience due to the fastening of the electrodes not only on the scalp and ears but also on the extremities. Electrodes can irritate the skin, however, only this side effect will bother a person, other treats aren’t available.
- What is an evoked potential studies? Specialists use stimuli for seeing the reaction of the brain to them. They can be light, sounds, touches, and sensations of the surrounding objects. This complex is aimed to search for the disorder inside the organism for preventing its progress in the future by choosing the appropriate curing. Doctors reach the effectiveness of the procedures when attaching electrodes with a gel or paste to the body, the parts of which depend on the type of studies. Usually, patients stay in the sedentary and lying positions for precise outcomes. A doctor can ask you to change your clothes into a medical gown if it is necessary for performing the test. The examination helps to clarify the severity of the condition, pain level by neuropathy or stenosis, check hearing abilities, and the causes of hearing loss. Specialists need some time to analyze the result to correct the treatment plan or prescribe new therapies.
- What does an abnormal visual evoked potential mean? Abnormal indexes during the test show the development of sharp progressive problems connected with the brain or nerves. The possible disorder is irritation of the optic nerves close to inflammation or destruction of the retina. Damages of the cerebral cortex also can cause the swelling of the nerve shell. The disorders provoke the slower transmission of the signals from other places of the body to the main center. As a result, visual impairment appears and similar conditions are progressing. The studies reveal multiple sclerosis, neuritis, and neuropathies, arteriopathy with subcortical infarcts. Destructed lesion of the visual track is no less unpleasant shutdown that is checked by the evoked potential test too. The indicators of the examination show pituitary adenoma as well that isn’t cancer, however, the growth of the pathology stimulates similar disorders. Anyway, it is always better to prevent complications, that is why doctors prescribe this instrument by minimum symptoms.