indigoasebo.blogg.se - Eeg test side effects

The technician may instruct you to do certain things while the test is in progress.

This machine converts the electrical impulses into visual patterns that appear on a screen.

Once the test begins, the electrodes send electrical impulse data from your brain to the recording machine.

The technician will put a sticky gel adhesive on 16 to 25 electrodes and attach them to spots on your scalp.

These spots are scrubbed with a special cream that helps the electrodes get a high-quality reading.

A technician will measure your head and mark where to place the electrodes.

You’ll lie down on your back in a reclining chair or on a bed.

The test usually takes roughly 30 to 60 minutes to complete and involves the following steps: Specialized technicians administer EEGs at hospitals, doctor’s offices, and laboratories. The electrodes transfer information from your brain to a machine that measures and records the data. An electrode is a conductor through which an electric current enters or leaves. Other factors that can influence your EEG reading include:Īn EEG measures the electrical impulses in your brain by using several electrodes attached to your scalp. The person responsible for interpreting your EEG will take these movements into account. Several types of movements can potentially cause “artifacts” on an EEG recording that mimic brain waves. Factors that could interfere with an EEG reading Some people may not be able to hyperventilate safely, such as people with a history of stroke, asthma, or sickle cell anemia. Hyperventilation is also commonly induced during an EEG to produce abnormalities. The technician performing the EEG is trained to safely manage any situation that might occur.

When someone has epilepsy or another seizure disorder, there’s a small risk that the stimuli presented during the test (such as a flashing light) may cause a seizure. If an EEG does not produce any abnormalities, stimuli such as strobe lights, or rapid breathing may be added to help induce any abnormalities. All rights reserved.EEG is usually painless and very safe.

For gabapentin, tiagabine, zonisamide, and rufinamide no studies in children are available.Ĭopyright © 2013 Elsevier B.V. Ethosuximide is not associated with cognitive impairment although the evidence is sketchy. No evidence for cognitive side-effects has been found for vigabatrin. For lamotrigine, there is evidence of a cognitive-enhancing effect on attention. Although data is sketchy, levetiracetam does not seem to have a negative impact on cognition. For topiramate, there is clear evidence for topiramate-induced cognitive impairment (attention, memory, and language function) in adults and children. For oxcarbazepine, there is no evidence for any detrimental change compared to valproate but mild improvements on attentional tests.

For carbamazepine, there are conflicting reports, which may be due to selection bias or dosing. Valproate does not seem to impair cognition if sufficiently controlled for hyperammonemia. Moderate monotherapy doses do not seem to induce much effect. Phenytoin may affect mental speed, mainly in higher dosing and polytherapy. With phenobarbital, there is a high risk for serious cognitive effects impacting attention and memory. All commonly used AEDs have some effect on cognitive function, and the effect may be substantial when crucial functions are involved, such as learning in children. Although the causes of cognitive impairment in patients with epilepsy have not been completely elucidated, three factors are clearly involved: the underlying etiology of epilepsy, the effects of seizures or the epileptiform EEG discharges themselves, and the central nervous system effects of antiepileptic drugs (AEDs).