This document provides information on seizures and epilepsy. It defines seizures as abnormal excessive hypersynchronous discharges from the central nervous system. Seizures can be classified as partial or generalized. Partial seizures originate in a specific area of the brain and include simple partial and complex partial seizures. Generalized seizures involve both hemispheres and include absence seizures (petit mal), tonic-clonic seizures (grand mal), tonic, atonic, and myoclonic seizures. The document describes the clinical features and EEG patterns associated with different seizure types.
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Hello readers.................!!!!!!!!!!!!!!
This is my 32nd powerpoint.....its regarding a form of childhood epilepsy, known as "LENNOX-GASTAUT SYNDROME".
It has been dealt with in the Therapeutics way, and in precise format.
Do look into it and give your reviews!!!!
Thank you!!!!
@rxvichu-alwz4uh!!!!
:) :)
Metabolic encephalopathy diagnosis and managementRobert Robinson
Overview of the diagnosis and management of metabolic encephalopathy for third year medical students in the Personalized Education Program portion of the third year curriculum at SIU Medicine
Hello readers.................!!!!!!!!!!!!!!
This is my 32nd powerpoint.....its regarding a form of childhood epilepsy, known as "LENNOX-GASTAUT SYNDROME".
It has been dealt with in the Therapeutics way, and in precise format.
Do look into it and give your reviews!!!!
Thank you!!!!
@rxvichu-alwz4uh!!!!
:) :)
During my 1st &2nd year of residency period , i used to teach Anatomy and Orthopaedics for foreign undergraduate medical students. At last year i taught Neurology for one batch. so i posted some of my collections for competely educational purpose coz i believe in knowledge ...inseted of deleting these ppts , they may me useful for others so i shared it ....
It contains description and salient points to diagnose various epileptic encephalopathies seen during infancy such as early myoclonic encephalopathies, Otahara syndrome, Dravet syndrome, West syndrome.
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2. Seizure (Latin sacire-to take possession of )
A paroxysmal event due to abnormal,
excessive hypersynchronous discharges from
an aggregate of central nervous system.
3. Hughlings Jackson—1870
Eminent British Neurologist.
Epilepsy
defined as an intermittent derangement
of nervous system due to an excessive
and disorderly discharge of cerebral
nervous tissue on muscles.
4. Convulsion.
An intense paroxysm of involuntary repetitive
muscular contractions.
Seizure (is a generic term)
Convulsive seizure or motor seizure.
Non convulsive seizure
sensory seizure.
Psychic seizure.
Autonomic seizure.
All seizures are not convulsions.
Not all seizures are convulsions.
5. Classification of seizures
(Adopted by
The International League Against Epilepsy -1981 )
Partial seizures
Simple partial seizures
(with motor, sensory, psychic or autonomic signs.)
Complex partial seizures.
Partial seizures with secondary generalization.
12. PARTIAL SEIZURES
(FOCAL SEIZURES)
Occur within discrete regions of the brain.
Cause motor, sensory, autonomic or psychic
symptoms.
Consciousness is fully preserved during the
seizure.
13. Partial Motor Seizures.
Due to seizure activity in the precentral gyrus.
Motor seizures affect the contralateral face,
arm, trunk or leg.
Movements typically clonic at a frequency of
around 2-3Hz.
Pure tonic posturing may also be seen.
Seizure may remain localised to one part or
may spread to involve the whole side.
14. Additional features of partial motor
seizures.
1. JACKSONIAN SEIZURE
Motor seizure begins in a restricted region
such as the fingers and gradually progresses
over seconds to minutes to include a larger
portion of the extremity.
15. 2. TODDS PARALYSIS.
Patients may experience paresis of the
involved limb for minutes to many hours
following the seizure.
16. 3. EPILEPSIA PARTIALIS CONTINUA.
Rarely the seizure may continue for hours to days
when it is called epilepsia partialis continua.
Often refractory to treatment.
17. 4. VERSIVE SEIZURES
A frontal epileptic focus may involve the frontal
eye field causing forced deviation of the eyes and
sometimes turning of the head to the opposite
side.
Such seizures often become generalised to a tonic
clonic seizure.
19. Somatosensory seizures
Focus in the contralateral post rolandic
convolution.
Sensory seizures described as
Numbness
Tingling
Pins and needles feeling
Sensation of crawling (formication)
Electric sensation,
Sensation of movement of the part.
Pain and thermal sensations occur occasionally.
20. Special sensory seizures
Visual seizures.
Rare.
Occur as sensation of darkness or flashes of light
which may be stationary or moving.
May appear colourless or coloured.
There may be twinkling or pulsating lights.
Visual hallucinations may occur with involvement
of occipito-temporal or antero-medial temporal
areas.
21. Auditory hallucinations.
Rare.
There may be sensation of buzzing or roaring in
the ears or sensation of human voice repeating
unrecognisable words.
Vertiginous sensations.
occur with supero posterior temporal region or
parieto temporal region involvement.
22. Olfactory hallucinations.
assoc with lesions of inferior and medial parts of
temporal lobe usually in the region of
parahippocampal convolution or uncus and hence
the term uncinate seizures.
patient perceives a foul smell
23. Gustatory hallucinations.
in temporal lobe disease.
salivation and sensation of thirst is present.
Vague and often indefinable visceral sensations
arising in the thorax, epigastrium and abdomen
may occur with temporal lobe focus.
24. Simple partial seizures
EEG—ictal EEG may show abnormal
discharges over the appropriate area of
cortex.
25. COMPLEX PARTIAL SEIZURES OR
PSYCHOMOTOR SEIZURES OR
TEMPORAL LOBE SEIZURES.
These patients have
Aura- in the form of a simple focal seizure or a
hallucination or illusion suggestive of a temporal
lobe origin.
have a period of altered behavior, altered
consciousness and amnesia to the event.
26. Psychic experiences which occur in complex
partial seizures.
1. Sensory illusions and distortions
Micropsia and macropsia- objects and persons in
the environment appear to shrink or recede into
distance or may enlarge
28. 3. Dyscognitive states.
Dejavu- feelings of increased familiarity.
Jamais vu- feelings of strangeness or
unfamiliarity.
Feeling of depersonalisation.
Sudden interruption in memory.
Fragments of old memories and scenes appear in
patients mind and recur with striking clarity.
29. 4. Emotional experiences.
Less commonly observed.
sadness,loneliness,anger,happiness,sexual
excitement.
Fear and anxiety-most common affective
experiences.
Sense of rage and intense anger.
30. Each of these psychic experiences may
constitute the entire seizure or some
combination may occur and proceed to a
period of unresponsiveness.
Immediately after the psychic experience
there follows a sudden behavioural arrest or
motionless stare which is accompanied by
automatisms.
31. AUTOMATISMS - occur in the form of
Lipsmacking
Chewing
Swallowing
Fumbling of hands
Shuffling of feet
Inappropriate acts.
32. OTHER AUTOMATISMS.
Gelastic epilepsy — laughter may be the most
striking feature of an automatism.
Volvular epilepsy—patient may walk repititively in
small circles.
Epilepsia procursiva—runs repititively.
Poriomania—wanders aimlessly as an ictal or
postictal phenomenon.
33. During the episode, patient is not in contact
with his surroundings.
Patient is typically confused following the
seizure.
May take seconds to an hour for full recovery
of consciousness.
Postictally patient may show anterograde
amnesia or aphasia (if dominant hemisphere)
34. Interictal EEG is often normal or may show
brief epileptiform spikes or sharo waves.
Since CP seizures can arise from the medial
temporal lobe or inferior lobe which are
distant from the scalp, EEG during seizure
may be non localising but detected using
sphenoidal or surgically placed intracranial
electrodes.
35. CP seizures can occur at any age.
Usually seen in adolescence and adults.
H/o febrile seizures in childhood is often
present.
2/3rds of CP seizure pts have GTC seizures.
36. Cp seizure pts may show - features of
Depressive illness
Psychotic symptoms
Paranoid delusional state and
Abnormalities of behaviour and
Personality during interictal period.
37. Partial seizures with secondary
generalisation.
Partial seizures can spread to both
hemispheres and produce GTC seizures.
Is often difficult to distinguish from primary
GTC seizure.
38. GENERALISED SEIZURES.
Arise from both cerebral hemispheres without any
focal onset.
Absence seizures (petit mal).
characterised by sudden LOC without loss of
postural control.
seizure typically lasts for only seconds.
consciousness returns as suddenly as it was lost.
no postictal confusion.
39. ABSENCE SEIZURES
Absence seizures may be accompanied by
rapid blinking movements, chewing, or clonic
movements of the hands.
Begin in childhood (4-8 yrs age) or early
adolescence.
Main seizure type in 15-20% of children with
epilepsy.
May occur 100 times a day (pykno epilepsy)
40. May manifest as unexplained day dreaming
or poor performance.
EEG-typically reveals characteristic
generalised 3 -Hz/sec spike and wave
discharges.
Respond well to treatment.
About 60—70% usually have a spontaneous
remission during adolesence.
May be associated with GTC seizures.
41. ATYPICAL ABSENCE SEIZURES
LOC may be longer.
Focal motor signs may be present.
EEG not characteristic and may show
generalised slow spike and wave pattern
with a frequency of about 2.5Hz/sec.
Often associated with diffuse structural
abnormalities of the brain and patients
may have neurologic dysfunction like
mental retardation.
Less responsive to treatment.
42. GENERALISED TONIC AND CLONIC
SEIZURES (GRAND MAL SEIZURES).
Most common seizure type due to metabolic
derangements.
10% of all patients with epilepsy have GTC
seizures.
GTC seizures are characterised by
premonitory phase.
Ictal phase.
post –ictal phase.
44. ICTAL PHASE
May begin abruptly without warning.
Tonic phase
characterised by tonic contraction of muscles
throughout the body .There is extension of the
back and neck,foll by arms and legs. This is
accompanied by LOC, upward eye deviation and
pupillary dilatation.
45. Ictal cry
tonic contraction of muscles of expiration and of
larynx at the onset will produce a loud moan called
ictal cry as air is forcibly emitted through closed
vocal cords. Respirations are impaired, secretions
pool in the oropharynx and cyanosis develops.
Tongue bite
contraction of the jaw muscles causes biting of the
tongue.
46. Increased sympathetic tone leads to increase
in heart rate, BP and pupil size.
Tonic phase lasts upto 10—30 secs and is
followed by clonic phase.
Clonic phase
during this phase, there are convulsive
movements of all the 4 limbs. jaw and facial
muscles. Breathing may be stertorous and saliva
may froth from the mouth.
The ictal phase usually lasts no more than 1 min.
47. POST ICTAL PHASE
Characterised by unresponsiveness, flaccidity,
hypersalivation.
Bladder or bowel incontinence may occur.
Consciousness is gradually regained over minutes
to hours followed by post ictal confusion.
Subsequently patients complain of headache,
fatigue or muscle ache.
48. EEG during tonic phase reveals a progressive
increase in generalised low voltage fast
activity followed by generalised high
amplitude polyspike discharges.
In the clonic phase, the high amplitude
activity is typically interrupted by slow waves
to create a spike and wave pattern.
The post ictal EEG shows diffuse slowing that
gradually recovers as the patient awakes.
49. ATONIC SEIZURES
Sudden loss of muscle tone lasting 1—2 secs
Brief impairment of consciousness.
No post ictal confusion.
EEG reveals brief generalised spike and wave
discharges followed immediately by diffuse slow
waves that correlate with loss of muscle tone.
Usually seen in association with known epileptic
syndromes.
50. MYOCLONIC SEIZURES
Sudden and brief muscle contraction involving
one part of the body or the entire body.
Seen physiologically while asleep.
Pathologic myoclonus seen in association with
metabolic disorders, degenerative CNS diseases,
or anoxic brain injury.
51. EEG shows bilaterally synchronous spike and
wave discharges synchronised with the
myoclonus.
Usually coexists with other forms of
generalised seizure disorders.
Are the predominant feature of juvenile
myoclonic epilepsy.
52. UNCLASSIFIED SEIZURES
Seen in neonates and infants due to differences in
neuronal function and connectivity in the
immature versus mature CNS.