What is an interictal abnormality?
Interictal abnormalities may result in transitory cognitive impairment, and it is quite possible that when occurring in a multifocal and frequent pattern, the accumulative effects are quite pronounced. Frequent and widespread EEG abnormalities during sleep may also have adverse effects on memory consolidation.
What is an interictal EEG?
Concept and Definition Interictal EEG is defined as an electroencephalographic recording that does not contain seizures or ictal manifestations and is therefore obtained in the intervals between clinical attacks. It is the most frequent recording type in the clinical practice.
What are interictal seizures?
Ictal is defined as the period of a seizure and interictal refers to the period between seizures.2. From: Therapy in Sleep Medicine, 2012.
What are interictal epileptiform discharges?
Interictal epileptiform discharges (IEDs), meaning spikes, polyspikes, sharp waves, or spike and slow-wave complexes without observed clinical seizures, are commonly observed in children with epilepsy. Neuropsychological evidence indicates that childhood epilepsy often has negative effects on cognitive function [2].
What is the interictal period?
Interictal refers to the period between seizures, or convulsions, that are characteristic of an epilepsy disorder. For most people with epilepsy, the interictal state corresponds to more than 99% of their life.
What is an interictal state?
What are Postictal symptoms?
The postictal state is a period that begins when a seizure subsides and ends when the patient returns to baseline. It typically lasts between 5 and 30 minutes and is characterized by disorienting symptoms such as confusion, drowsiness, hypertension, headache, nausea, etc.
What does interictal mean?
Epileptiform EEG activity has been categorized as ictal, meaning during a seizure, postictal, meaning after a seizure and interictal, meaning between seizures.
What does a spike mean on an EEG?
Spikes or sharp waves are terms commonly seen in EEG reports. If these happen only once in a while or at certain times of day, they may not mean anything. If they happen frequently or are found in specific areas of the brain, it could mean there is potentially an area of seizure activity nearby.
What does Interictal mean?
What does Ictal EEG do?
The middle of a seizure is called the ictal phase. It’s the period of time from the first symptoms (including an aura) to the end of the seizure activity, which correlates with the electrical seizure activity in the brain. Sometimes, the visible symptoms last longer than the seizure activity on an EEG.
What could cause an abnormal EEG?
Abnormal results on an EEG test may be due to: Abnormal bleeding (hemorrhage) An abnormal structure in the brain (such as a brain tumor) Tissue death due to a blockage in blood flow (cerebral infarction) Drug or alcohol abuse. Head injury. Migraines (in some cases)
What are periodic discharges on EEG?
Generalized periodic epileptiform discharges were defined as the occurrence of periodic complexes occupying at least 50% of a standard 30-minute EEG over both hemispheres in a symmetric, diffuse, and synchronized manner, and BIPLEDs were defined as bilateral independent periodic lateralized epileptiform discharges.
Can EEG detect Previous seizures?
However, it is not quite that simple. An EEG can only detect a seizure when seizure like waves, or seizures themselves are occurring in the brain. A typical EEG only measures brain activity for 1-2 hours up to 24 hours (if you are in the hospital).