Not all the persons who suffers seizures are considered to have epilepsy Diagnosis of epilepsy is applied to only those patients whose seizures are generated by their own chromic brain dysfunction ID: 659358
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Slide1
SEIZURE OF THE BRAINSlide2
The primary symptom of Epilepsy is the Epileptic Seizure.
Not all the persons who suffers seizures are considered to have epilepsy.
Diagnosis of epilepsy is applied to only those patients whose seizures are generated by their own chromic brain dysfunction. Slide3
Convulsions-
(motor seizure) these often involve tremors (
clonus
), rigidity (tonus), and loss of both balance and
conciousness
.Slide4
Causes of Epilepsy:
Viruses
Neurotoxins
Tumors
Blows to the headSlide5
The diagnosis of Epilepsy rests heavily on evidence from electroencephalography (EEG).Slide6
Some epileptic experience peculiar psychological changes just before a convulsion. These changes, called “
epileptical
auras” may take different forms.
Aura-
a subjective sensation or motor phenomenon that precedes and indicates the onset of a neurological episode, such as a migraine or an epileptic seizure.Slide7
For example:
A bad smell
A specific thought
A vague feeling of familiarity
A hallucination
Or a tightness of the chestSlide8
Epileptical
auras are important for two reasons:
First, the nature of the auras provides clues concerning the location of the
epileptical
focus.
Second, because the
epileptical
auras experienced by a particular patient who are often similar from attack to attack, they warn the patient of an impending convulsion.Slide9
Partial epilepsy or generalized epilepsy
The various seizure types are so different from one another that epilepsy is best viewed not as a single disease but as a number of different, but related disease.
Partial seizure is a seizure that does not involve the entire brain.
The epileptic neurons at a focus begin to discharge together in burst and it is this produces epileptic spilling in the EEG.Slide10
The synchronous activity tends to spread to other areas of the brain, but in the case of partial seizures not to the entire brain.
The specific behavioural symptoms of a partial epileptic seizure depends on where the disruptive discharges begin into what structures they spread.
Because partial seizures do not involve the entire brain, they are not usually accompanied by a total loss of consciousness or equilibrium.Slide11
The 2 major categories of partial seizures
Simple
Simple partial seizures- are partial seizures whose symptoms are primarily sensory or motor or both;
These are sometimes called “
Jacksonian
Seizures” after the famous 19
th
century neurologist
Hughlings
Jackson.
As the epileptic discharges spread through the sensory or motor areas of the brain, the symptoms spread systematically through the body.Slide12
Complex
Complex partial seizures- are often restricted to the temporal lobes, and those who experience them are often said to have “temporal lobe epilepsy”.
During a complex partial seizure, the patient engages in compulsive, repetitive, simple behaviour commonly referred to as “automatism” and in more complex behaviours that appear almost normal. Slide13
Generalized seizures- involves the entire brain
Some begin as focal discharges that gradually spread through the entire brain.
In other cases, the discharges seem to begin almost simultaneously in all parts of the brain.
Like partial seizures, generalized seizures occur in many forms.
One is the “grand mal” (literally: big trouble”) seizure. Slide14
Common manifestation of symptoms:
Loss of consciousness
Loss of equilibrium
Violent “tonic-
clonic
” convulsion- a convulsion involving both tonus and
clonus
.
Tongue biting, urinary incontinence
cyanosisSlide15
Hypoxia (shortage of oxygen supply to tissue for example to brain) that accompanies a grand mal seizure can itself cause brain damage.
A second major category of generalized seizure is the “
peli
mal” (literally “small trouble”) “seizure”.Slide16
Are not associated with convulsions. Their primary behavioural symptoms is the “petit mal absence”- a disruption of consciousness that is associated with a cessation of ongoing behaviour a vacant look, and sometimes fluttering eyelids.
Most common in children
Frequently ceased at puberty
They often go undiagnosed
Children with “petit mal seizure” considered as “day dreamers”.Slide17
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