Neurology: Epilepsy & Headache Flashcards
What 5 types of seizures are generally seen in adults?
1) Generalised tonic-clonic seizures
2) Partial seizures (or focal seizures)
3) Myoclonic seizures
4) Tonic seizures
5) Atonic seizures
Can also have alcohol withdrawal seizures
What are 3 more common seizures in children?
1) Absence seizures
2) Infantile spasms
3) Febrile convulsions
What 3 conditions may have an association with epilepsy?
1) cerebral palsy: around 30% have epilepsy
2) tuberous sclerosis
3) mitochondrial diseases
Who do febrile convusions typically occur in?
Children between the ages of 6 months and 5 years
What are febrile convulsions?
Tonic-clonic seizures that occur in children during a high fever.
When is the peak incidence of alcohol withdrawal seizures?
36 hours following cessation of drinking
What can reduce the risk of alcohol withdrawal seizures?
Benzos
What are psychogenic non-epileptic seizures?
describes patients who present with epileptic-like seizures but do not have characteristic electrical discharges
What may patients with psychogenic non-epileptic seizures have a PMH of?
patients may have a history of mental health problems or a personality disorder
What are ‘generalised’ seizures?
these engage or involve networks on BOTH sides of the brain at the onset
What are ‘focal’ or ‘partial’ seizures?
these start in a specific area, on ONE side of the brain
Types of generalised seizures?
1) tonic-clonic (grand mal)
2) tonic
3) clonic
4) typical absence (petit mal)
5) myoclonic: brief, rapid muscle jerks
6) atonic
Is there a loss of conscioussness in generalised seizures?
Yes
What can generalised seizures be further subdivided into?
Motor (e.g. tonic-clonic) and non-motor (e.g. absence)
What is involved in a tonic clonic seizure?
- tonic (muscle tensing)
- clonic (muscle jerking)
- complete loss of consciousness
- may be tongue biting, incontinence, groaning and irregular breathing
- followed by prolonged post-ictal period
What may patients experience before a tonic clonic seizure?
Patients might experience aura, an abnormal sensation that gives a warning that a seizure will occur
What is the post-ictal period?
Period following seizure where the person is confused, tired, and irritable or low.
Where do partial/focus seizures often occur?
Temporal lobes
Is there a LOC in partial/focus seizures?
no - patients remain awake during partial seizures
Are patients aware during partial/focal seizures?
Yes: remain aware during simple partial seizures
No: lose awareness during complex partial seizures
What symptoms may be associated with partial seizures, depending on the location of the abnormal electrical activity?
1) Déjà vu
2) Strange smells, tastes, sight or sound sensations
3) Unusual emotions
4) Abnormal behaviours
What are myoclonic seizures?
Myoclonic seizures present with sudden, brief muscle contractions, like an abrupt jump or jolt.
Is there a LOC in myoclonic seizures?
No
What can myoclonic seizures occur as part of in children?
juvenile myoclonic epilepsy
What are tonic seizures?
Tonic seizures involve a sudden onset of increased muscle tone, where the entire body stiffens.
This results in a fall if the patient is standing, usually backwards.
What are atonic seizures?
Atonic seizures (causing “drop attacks”) involve a sudden loss of muscle tone, often resulting in a fall.
What may atonic seizures be indicative of?
Lennox-Gastaut syndrome.
When do atonic seizures often begin?
Childhood
Who are absence seizures usually seen in?
Children
What are absence seizures?
The patient becomes blank, stares into space, and then abruptly returns to normal. During the episode, they are unaware of their surroundings and do not respond. These typically last 10 to 20 seconds. Most patients stop having absence seizures as they get older.
What are infantile spasms?
Infantile spasms are also known as West syndrome.
Brief spasms beginning in first few months of life.
Has a poor prognosis.
When do infantile spasms typically start?
First 6 months of life
What are 3 features seen in infantile spasms?
1) Flexion of head, trunk, limbs –> extension of arms (Salaam attack); last 1-2 secs, repeat up to 50 times
2) Progressive mental handicap
3) EEG: hypsarrhythmia
What is the characteristic EEG feature in infantile spasms?
Hypsarrhythmia
Treatment of infantile spasms?
1) ACTH
2) vigabatrin
prognosis of febrile convulsions?
1) do not usually cause any lasting damage
2) 1/3 will have another febrile convulsion.
3) slightly increase the risk of developing epilepsy.
Link between febrile convulsions and epilepsy?
Febrile convulsions slightly increase the risk of epilepsy
Differentials for a seizure?
1) Vasovagal syncope (fainting)
2) Hypoglycaemia
3) Pseudoseizures (non-epileptic attacks)
4) Cardiac syncope (e.g., arrhythmias or structural heart disease)
5) Hemiplegic migraine
6) TIA
1st line investigations in epislepy?
1) An electroencephalogram (EEG)
2) MRI brain
Purpose of MRI brain in epilepsy/seizures?
MRI brain is used to diagnose structural pathology (e.g., tumours).
Additional investigations in epilepsy/seizures?
1) Blood glucose for hypoglycaemia and diabetes
2) ECG
3) Serum electrolytes
4) Blood cultures, urine cultures and lumbar puncture: where sepsis, encephalitis or meningitis is suspected
Driving following a 1st seizure?
Generally patients cannot drive for 6 months following a seizure
Driving in patients with established epilepsy?
patients with established epilepsy must be fit free for 12 months before being able to drive
General safety precautions in epilepsy:
1) The DVLA will remove their driving licence until specific criteria are met (e.g., being seizure-free for one year)
2) Taking showers rather than baths (drowning is a major risk in epilepsy)
3) Particular caution with swimming, heights, traffic and dangerous equipment
Give 4 examples of antiepileptics
1) Sodium valproate
2) Carbamazepine
3) Lamotrigine
4) Phenytoin
Mechanism of sodium valproate?
Increases GABA activity
Indications for sodium valproate?
1) Generalised tonic clonic seizures in males
2) Generalised tonic clonic seizures in women WHO CANNOT HAVE CHILDREN
1st line antiepileptic in women who are able to have children?
Lamotrigine or Levetiracetam
Why is sodium valproate not used in women of reproductive age?
Teratogenic - can cause neural tube defects and developmental delay.
When can sodium valproate be used in women of reproductive age?
Unless there are no suitable alternatives and strict criteria are met –> Valproate Pregnancy Prevention Programme is in place
Side effects of sodium valproate?
1) Teratogenic (harmful in pregnancy)
2) Liver damage and hepatitis
3) Hair loss (regrowth may be curly)
4) Tremor
5) Reduce fertility
6) Ataxia
7) Increased appetite and weight gain
1st & 2nd line antiepileptics in partial/focal seizures?
1st –> Lamotrigine or Levetiracetam
2nd –> carbamazepine
Mechanism of carbamazepine?
Binds to sodium channels increasing their refractory period
How does sodium valproate interact with the P450 system?
Is a P450 enzyme inhibitor
How does carbamazepine interact with the P450 system?
P450 enzyme inducer
Side effects of carbamazepine?
1) dizziness and ataxia
2) drowsiness
3) leucopenia and agranulocytosis
4) syndrome of inappropriate ADH secretion
5) visual disturbances (especially diplopia)
Which antiepileptic can cause SIADH?
Carbamazepine
1st line antiepileptics in myoclonic seizures?
Men & women who cannot have children –> sodium valproate
Women of reproductive age –> Levetiracetam
1st line antiepileptics in tonic and atonic seizures?
Men & women who cannot have children –> sodium valproate
Women of reproductive age –> Lamotrigine
1st line antiepileptics in absence seizures?
Men & women who cannot have children –> ethosuximide
Women of reproductive age –> ethosuximide