Neurology Flashcards
What is cerebral palsy?
Abnormality of movement and posture
→ activity limitation attributed to non-progressive disturbances that occurred in developing fetal or infant brain
- Term used for brain injuries up to 2yo
- After this called acquired brain injury
What are motor disorders of CP often accompanied by disturbances in? (7)
- Cognition
- Communication
- Behaviour
- Perception
- Sensation
- Seizure disorders
- Secondary msk problems
Causes of cerebral palsy?
80% antenatal in origin:
- Vascular occlusion
- Cortical migration disorders
- Structural maldevelopment of brain during gestation
- Genetic syndromes
- Congenital infection
10% due to hypoxicischaemic injury during delivery:
10% postnatal in origin:
- Meningitis/encephalitis/ encephalopathy
- Head trauma from accidental or non accidental injury
- Symptomatic hypoglycaemia
- Hydrocephalus
- Hyperbilirubinaemia
Early features of CP? (7)
- Abnormal limb +/or trunk posture & tone in infancy
- Delayed motor milestones
- → May be accompanied by slowing of head growth
- Feeding difficulties, with oromotor incoordination, slow feeding, gagging & vomiting
- Abnormal gait once walking achieved
- Asymmetric hand function <12m of age
- Primitive reflexes may persist and become obligatory
3 types of CP?
- Spastic (90%)
- Dyskinetic (6%)
- Ataxic (4%)
What is the sequence of normal motor development? With median and limit ages
Pushes up on arms and holds head up - 1.5m, 3m
Sits supported, head up with rounded back - 3m, 6m
Sits unsupported, arms free - 6m, 9m
Pulls to standing - 9m, 13m
Stands or walks independently - 12m, 18m
What is the commonest cause of developmental problems?
Cerebral palsy
What is spastic CP?
- Damage to UMN (pyramidal or corticospinal tract) pathway
- Limb tone increased (spasticity)
- → Associated brisk deep tendon reflexes and extensor plantar responses
- Tone in spasticity is velocity dependent→ faster muscle is stretched → greater resistance
- This elicits a dynamic catch which is hallmark of spasticity
- Increased limb tone may suddenly yield under pressure in ‘clasp knife’ fashion
- Limb involvement described as unilateral or bilateral
- Spasticity tends to present early - may be seen in neonatal period
- Sometimes initial hypotonia, esp of head and trunk
3 types of spastic CP?
Hemiplagia
- Unilat involvement of arm and leg
Quadriplegia
- All 4 limbs affected, often severely
Diplegia
- All 4 limbs affected, but legs > arms
Features of hemiplegia in spastic CP?
- Unilateral involvement of arm and leg
- Arm affected > leg → face spared
- Present at 4–12m of age with fisting of affected hand, flexed arm, pronated forearm, asymmetric reaching or hand function
- Subsequently tiptoe walk (toe–heel gait) on affected side may show
- Affected limbs may initially be flaccid + hypotonic → increased tone soon emerges as predominant sign
- PMH may be normal - unremarkable birth history with no evidence of hypoxic-ischaemic encephalopathy
- In some, condition is caused by neonatal stroke
- Larger strokes may cause hemianopia of same side as affected limbs
Features of quadriplegia in spastic CP?
- All 4 limbs affected, often severely
- Trunk involved with tendency to opisothonus (extensor posturing), poor head control and low central tone
- Often associated with seizures, microcephaly and moderate/ severe intellectual impairment
- May have been a hx of perinatal HIE
Features of diplegia in spastic CP?
- All 4 limbs, but legs affected much more than arms
- → Hand function may appear relatively normal
- Motor difficulties in arms most apparent with functional use of hands
- Walking is abnormal
- Diplegia associated with preterm birth due to periventricular brain damage
What is dyskinesia and 3 types of dyskinetic movements?
Movements which are involuntary, uncontrolled, occasionally stereotyped, and often more evident with active movement or stress
Chorea – irregular, sudden and brief nonrepetitive movements
Athetosis – slow writhing movements occurring more distally such as fanning of fingers
Dystonia – simultaneous contraction of agonist and antagonist muscles of trunk and prox muscles often giving twisting appearance
Other features of dyskinetic CP?
- Intellect may be relatively unimpaired
- Often present with floppiness, poor trunk control and delayed motor development in infancy
- Abnormal movements may only appear towards end of 1st y of life
- Signs due to damage/dysfunction in basal ganglia or associated pathways (extrapyramidal)
- Past→ commonest cause hyperbilirubinaemia (kernicterus) due to Rh disease of newborn
- Now → hypoxic ischaemic encephalopathy at term
Features of ataxic CP?
- Most genetically determined
- When due to acquired brain injury (cerebellum or connections), signs occur on same side as lesion but usually relatively symmetrical
- Early trunk and limb hypotonia, poor balance and delayed motor development
- Incoordinate movements, intention tremor and ataxic gait may be evident later
3 elements of CP management?
Physiotherapy
Drugs
- Diazepam as muscle relaxant
Orthopaedic surgery
Prevalence of epilepsy?
0.5%
Causes of epilepsy? (7)
Idiopathic (70-80%) Cerebral dysgenesis/malformation Cerebral vascular occlusion Cerebral damage eg congenital infection, HIE, IVH Cerebral tumour Neurodegenerative disorders Neurocutaneous syndromes
Features of generalised seizures? (5)
- Onset in both hemispheres
- Always loss of consciousness
- No warning
- Symmetrical seizure
- Bilaterally synchronous seizure discharge on EEG or varying asymmetry
Types of generalised seizures? (5)
Absence Myoclonic Tonic Tonic-clonic Atonic
Features of absence seizures?
- Transient loss of consciousness
- Abrupt onset and termination
- Unaccompanied by motor phenomena except for some flickering of eyelids and minor alteration in muscle tone
- Absences may be typical (petit mal) or atypical
- Often can be precipitated by hyperventilation
Features of myoclonic seizures?
- Brief, often repetitive, jerking movements of limbs, neck or trunk
- Non-epileptic myoclonic movements also seen physiologically in hiccoughs (myoclonus of diaphragm) or on passing through stage II sleep (sleep myoclonus)
Features of tonic seizures? (1)
Generalised increase in tone
Features of tonic-clonic seizures?
- Rhythmical contraction of muscle groups following tonic phase
- In rigid tonic phase, children may fall to ground, sometimes injuring themselves
- They don’t breathe and become cyanosed
- Followed by clonic phase, with jerking of limbs
- Breathing irregular, cyanosis persists and saliva may accumulate in mouth
- May be biting of tongue and incontinence of urine
- Seizure usually lasts few secs→mins, followed by unconsciousness or deep sleep up to several hrs
Features of atonic seizures?
Often combined with myoclonic jerk, followed by transient loss of muscle tone causing sudden fall to floor or drop of head
Features of frontal focal seizures?
- Involve motor or premotor cortex
- May → clonic movements, which may travel proximally (Jacksonian march)
- Asymmetrical tonic seizures can be seen, which may be bizarre and hyperkinetic and can be mistakenly dismissed as nonepileptic events
- Atonic seizures may arise from mesial frontal discharge
Features of temporal lobe focal seizures?
- Most common of all epilepsies
- May result in strange warning feelings or aura with smell & taste abnormalities and distortions of sound & shape
- Lipsmacking, plucking at clothing and walking in nonpurposeful manner (automatisms) may be seen, following spread to premotor cortex
- Déjàvu and jamaisvu described (intense feelings of having been, or never having been, in same situation before)
- Consciousness can be impaired and length of event longer than typical absence
Name a feature of occipital lobe focal seizures?
- Cause distortion of vision
Name a features of parietal love focal seizures?
- Cause contralateral dysaesthesias (altered sensation), or distorted body image
Ix used in epilepsy?
EEG MRI/CT - not routinely Functional imaging - PET/SPECT Metabolic Ix Genetic Ix
Yet normally diagnosis is from detailed hx
First line treatment for
a) tonic-clonic
b) absence
c) myoclonic
d) focal seizures?
a) valproate
b) valproate, ethosuxamide
c) valproate
d) carbemazepine, lamotrigine
3 types of non-pharmacological treatment for epilepsy?
Ketogenic (fat) based diet
Vagal nerve stimulation
Surgery