It is estimated that at least 2/3 of seizures occur in sleep. Not everyone who has a seizure has epilepsy Some seizures can hardly be noticed, while others are totally disabling.
A seizure is a sudden surge of electrical activity in the brain that usually affects how a person feels or acts for a short time. Seizures are not a disease in themselves. Instead, they are a symptom of many different disorders of the brain. Not everyone who has a seizure has epilepsy.
Epilepsy is a medical condition that produces seizures affecting a variety of mental and physical functions. When a person has 2 or more unprovoked seizures they are considered to have epilepsy.
Any one of us can have a seizure if the conditions are right. Drugs Hypoglycemia High fever ECT Infectious disease Meningitis/encephalitis
Plan for the future Solve complex problems Express and control emotional behavior Coordinate complex skilled movements Some aspects of speech
In most people the temporal lobes have somewhat different functions The left temporal lobe generally helps us to understand language, and speak. The right temporal lobe helps us to remember things.
Includes sensory areas, responsible for feelings of temperature, touch, pressure and pain.
Seizures are classified into 2 categories or groups: Partial and Generalized
Involve only a portion of the brain at the ONSET. They are further divided into two parts: Simple partial, in which consciousness is not impaired Complex partial in which consciousness is impaired.
These seizures are commonly called grand mal. And by definition begin with loss of consciousness. Typically each seizure has 2 phases, tonic and clonic. Tonic Phase consists of an increase in muscle tone which causes stiffening. Clonic Phase consists of alternating tightening and relaxing of muscles--Jerking
Another type of generalized seizure is the Atonic Seizure. The seizure consists of loss of all strength rather than becoming stiff. They last only a few seconds so it is impossible to accurately determine the patient’s level of consciousness.
Brief episodes of staring. May have some associated eye blinking/fluttering, or lip smacking. Spells last only a few seconds Start in Childhood, disappear by late teens
Seizures that begin with an abnormal electrical discharge from a limited area of the brain are called partial seizures. Two kinds: Simple complex Partial Complex
The specific area of he brain where each of these seizures begins determines what the seizure looks like. Commonality is that the person having the seizure remains alert and can remember what happened. Sometimes called focal seizures
These seizures begin in a small area of the temporal or frontal lobe, but they quickly involve areas that affect alertness and awareness Consciousness is lost, the patient has no memory of the event
Both simple and complex partial seizures can spread, resulting in secondarily generalized tonic clonic seizures. In the EEG world this is called secondary subcortical synchrony
Rebecca Clark-Bash23 Summary of Clinical & EEG Features of Epileptic Seizures SeizureUsual Duration Loss of Consc. Post-Ictal Confusion ICTAL EEG Simple Partial 5-10 secNO Focal Spikes (NL) Complex Partial Variable 5-10 sec 1-2 min YES Focal or Lat. Spike Absence 5-10 /sec Clustering YESNO Gen. 3 /sec S & W Gen. Tonic-Clonic 1-2 minYES Gen. High Amp Spikes
Rebecca Clark-Bash 25 Term Definition Ictal EEG Describes the recording during the event Interictal EEG Describes the recording in between each event Postictal EEG Describes the period of time immediately following an event
Any paroxysmal rhythmic frequency (e.g. beta, alpha, or even delta) may also be classified as epileptiform. Certainly the most common types of Epileptiform activity are: spikes, sharp waves, spike and waves
A wave with a duration of 80 msc or less, usually negative, standing out from the background.
A wave with a duration of 120-80 msc, usually negative, standing out from the background.