germapretty.blogg.se - Eeg test side effects

Several different etiologies may provoke generalized background slowing, including the effects of sedative centrally acting medications, neurodegenerative disorders, a widespread neurodevelopmental process, hydrocephalus, metabolic or toxic encephalopathy, CNS infectious disorders such as meningoencephalitis, or even a focal midline structural lesion involving deep midline brainstem, diencephalic structures, or both (producing a phenomenon known in older EEG literature as a “distance or projected rhythm,” which often selectively involves the anterior or bifrontal areas and produces a pattern known as frontal intermittent rhythmic delta activity, or FIRDA). Generalized background slowing indicates diffuse cerebral dysfunction, which, similar to focal slowing, is also not specific as to cause. See Figure 54 for an example of focal temporal regional slowing, which also shows a “breach rhythm,” with focally elevated background amplitude as a result of a skull defect and previous surgery in this area. The various causes are too numerous to be comprehensive, but common examples include transient or permanent ischemia resulting from stroke, brain hemorrhage, tumors, traumatic injury, malformations of cortical development, nonstructural focal cerebral dysfunction corresponding to a focal epileptic focus, focal involvement of the cortex by neurodegeneration, arteriovenous malformations, and focal brain infection caused by bacterial cerebritis or viral encephalitis. Focal brain lesions of a variety of causes to cortex, underlying white matter, or both may induce focal slowing. When intermittent, focal slowing may indicate unveiling of subtle focal cerebral dysfunction owing to the effects of a sedating or hypnotic medication, although usually medication-induced slowing is generalized in nature. A variety of etiologies for focal cerebral dysfunction may be seen. Slowing may be intermittent or persistent, with more persistent or consistently slower activity generally indicating more severe underlying focal cerebral dysfunction.

Please arrive 5 minutes before your scheduled appointment.Focal slow wave activity on the EEG is indicative of focal cerebral pathology of the underlying brain region.

This test is most useful under drowsiness and sleep.

Please do not sleep on the way to the appointment.

If the child is very young and unable to hold still for the placement of the electrodes, swaddling the child for the duration of the test may be neccessary.

Children should be accompanied by their favourite toy or blanket.

You are able to eat, drink and take prescribed medication as usual, but avoid caffeine.

Do not apply any sprays, lotions, or oils to your hair, and have someone check/treat your hair for headlice.

Wash their hair the night before the EEG.

There are generally no side effects, other than dirty hair.

At the end of the test, the Technician will remove the electrodes and you are ready to leave.

The next 20-40 minutes will be spent recording your brain waves.

Approximately 27 electrode discs will be placed onto your head, held in place with toothpaste-like cream or glue.

The EEG Technician will prepare small spots on your head by using a cotton swab to scrub the areas.

Patients will relax in a recliner for the duration of the test.

Ensure you go to the bathroom before you enter the room.

When receiving an EEG, please take the following steps This test is performed for multiple conditions, particularly epilepsy. An Electroencephalogram (EEG) is a recording of the brain's electrical wave activity, conducted from wires placed on the scalp.