What is Polyspike and wave?
EEG characteristics in IGE include generalised spike or polyspike and slow wave discharge at 3–5 Hz, normal background cerebral activity, and a relatively high incidence of photosensitivity. Polyspike discharge tends to be associated with phenotypes in which myoclonus is prominent.
What is spike-and-wave in EEG?
Spike-and-wave is a pattern of the electroencephalogram (EEG) typically observed during epileptic seizures. A spike-and-wave discharge is a regular, symmetrical, generalized EEG pattern seen particularly during absence epilepsy, also known as 'petit mal' epilepsy.
What is generalized Polyspike?
GPFA was conventionally defined as a burst of high-amplitude generalized rhythmic spikes with frontal predominance lasting at least 1 second18 (figure 3A). When a burst of at least 5 spikes lasted less than 1 second, it was newly defined in this study as “generalized polyspike train” (GPT) (figure 3, B and C).Nov 6, 2018
What does an EEG show for epilepsy?
An EEG gives information about the electrical activity of the brain during the time the test is happening. When someone has an epileptic seizure their brain activity changes. This change, known as epileptiform brain activity, can sometimes be seen on an EEG recording.May 28, 2020
What is a normal EEG?
Most waves of 8 Hz and higher frequencies are normal findings in the EEG of an awake adult. Waves with a frequency of 7 Hz or less often are classified as abnormal in awake adults, although they normally can be seen in children or in adults who are asleep.Oct 9, 2019
What type of movements are associated with Polyspikes and spikes on the EEG?
Spikes, or more commonly sharp waves, are typically 200 milliseconds in duration and are followed by slow waves. Polyspike discharges are seen in those epilepsy variants with prominent myoclonic seizures or during non–rapid eye movement (REM) sleep.Oct 1, 2020
What is epilepsy and its causes?
What causes epilepsy? In general, epilepsy and seizures result from abnormal circuit activity in the brain. Any event ranging from faulty wiring during brain development, brain inflammation, physical injury or infection can lead to seizure and epilepsy.
What is focal epileptiform?
Focal interictal epileptiform discharges (IEDs) are sharply contoured transients that are distinct from and usually interrupt background activities. IEDs are almost always of negative polarity at the scalp surface. IEDs usually occur sporadically.Oct 9, 2019
What is focal slowing?
Focal slow wave activity on the EEG is indicative of focal cerebral pathology of the underlying brain region. Slowing may be intermittent or persistent, with more persistent or consistently slower activity generally indicating more severe underlying focal cerebral dysfunction.
What is Spike and slow wave?
The slow spike-and-wave or sharp-and-slow-wave complexes consist of generalized discharges occurring at a frequency of 1.5 to 2.5 Hz. The morphology, amplitude, and repetition rate may vary both between bursts and during paroxysmal bursts of spike-and-wave activity, and asymmetries of the discharge are frequent.
What is dravet?
Definition. Dravet syndrome, previously called severe myoclonic epilepsy of infancy (SMEI), is an epilepsy syndrome that begins in infancy or early childhood and can include a spectrum of symptoms ranging from mild to severe.Feb 1, 2021
What is LGS syndrome?
Lennox-Gastaut syndrome (LGS) is a type of epilepsy. Patients with LGS experience many different types of seizures including: Tonic - stiffening of the body. Atonic - temporary loss of muscle tone and consciousness, causing the patient to fall.
Does abnormal EEG confirm epilepsy?
Also, many people who do have epilepsy will only have 'abnormal' activity on the EEG if they have a seizure at the time the test is happening. This is why having an EEG cannot diagnose epilepsy, and why EEGs are used alongside other tests and investigations.Feb 23, 2020
Can EEG trigger seizures?
In rare instances, an EEG can cause seizures in a person with a seizure disorder. This is due to the flashing lights or the deep breathing that may be involved during the test. If you do get a seizure, your healthcare provider will treat it immediately.
Can EEG detect past seizures?
You may have had seizures in the past, such as brief absence seizures or auras, without knowing they were seizures. Doing an electroencephalogram (EEG), especially after sleep deprivation, may reveal abnormalities in the brain's electrical activity that may help confirm the diagnosis of epilepsy.
Which EEG findings are characteristic of epilepsy (eeeeg)?Which EEG findings are characteristic of epilepsy (eeeeg)?
EEG manifestations reported in NCSE include continuous or virtually continuous spike wave discharge, discrete focal electrographic seizures, diffuse slow activity with or without spikes, and periodic or repetitive epileptiform discharges.
What is the Hallmark EEG pattern of benign childhood epilepsy?What is the Hallmark EEG pattern of benign childhood epilepsy?
In benign childhood epilepsy with centro-temporal spikes (benign rolandic epilepsy), the EEG hallmark is high amplitude focal sharp wave discharges in the central and temporal regions, either bilateral or unilateral. A small percentage shows focal discharges in other regions or generalised spike wave. The discharges are potentiated by sleep.
How accurate is epileptiform activity on EEG?How accurate is epileptiform activity on EEG?
Epileptiform activity is specific, but not sensitive, for diagnosis of epilepsy as the cause of a transient loss of consciousness or other paroxysmal event that is clinically likely to be epilepsy. EEG has relatively low sensitivity in epilepsy, ranging between 25–56%.
Does Interictal EEG increase the likelihood of induced edema after generalised seizures?Does Interictal EEG increase the likelihood of induced edema after generalised seizures?
Although potentiation of epileptiform discharge may occur up to 24 hours after partial and generalised seizures, there is insufficient high quality evidence that interictal EEG within this period increases the likelihood of obtaining IED.