Neuro Flashcards
presentation extradural haemorrhage
young person, Hx of injury with lucid interval
appearance extradural haemorrhage CT
umbrella shape
presentation subdural haemorrhage
old person, Hx of falls
appearance subdural haemorrhage CT
convex shape
parkinsonism triad
- akinesia
- tremor
- rigidity
Mx Parkinsons
- MAO-inhibitor (Rasigiline, Selegiline) OR Dopamine Agonist (pramiprexole, bromocriptine)
- Add Levodopa
what is levodopa combined with and why
Carbidopa - prevent peripheral conversion of Levodopa
s/e of Levodopa
reduced efficacy w time postural hypotension n+v dyskinesias psychosis visual hallucinations red colour of urine on standing
Mx of n+v due to Levodopa
domperidone
Man with parkinsons disease, started on new med and has falls - Dx and due to what med
postural hypotension
caused by Levodopa
MAO-inhibitors
rasigiline
selegine
cabergoline
dopamine agonists
bromocriptine
pramiprexole
ropinorole
drugs causing parkinsonism
chlorpromazine (typical antipsychotic) haloperidol (typical antipsychotic) prochlorperazine lithium metoclopramide valproic acid
multisystem atrophy
parkinsons + syndrome
- early autonomic stuff (impotence/incontinence, postural hypo)
(ANS involvement + cerebellar)
progressive supranuclear palsy
parkinsons + syndrome
- vertical gaze palsy - diplopia
cortico-basal degeneration
parkinsons + syndrome
- akinetic rigidity of one limb
cushings reflex triad
- HTN
- Bradycardia
- Irregular breathing
what is cushings reflex a sign of
imminent coning/brain herniation (usually pre-terminal)
pt in a coma after motorbike crash - Dx?
diffuse axonal injury (mechanical shearing)
eqn for CPP
CPP = MAP - ICP
normal CPP
70-100 mmHg
normal MAP
70-110 mmHg
normal ICP
0-20 mmHg
aiming CPP after head injury
> 60 mmHg
aiming MAP after head injury
> 80 mmHg
aiming ICP after head injury
< 20 mmHg
criteria for brainstem death testing
- Deep coma of known aetiology.
- Reversible causes excluded
- No sedation
- Normal electrolytes
6 tests to confirm brainstem death
corneal reflex oculovestibular reflex pupillary reflex cough reflex absent response to supraorbital pressure no spontaneous ventilation
RTA hit on R side of head, lucid period and then deteriorated in A&E - Dx?
Extradural haematoma
pt has had a SAH and normal CT and no RF for coning - next best Ix?
LP (1`2h after onset of symp)
alcoholic person is confused and drowsy - Dx?
subdural haemorrhage
pt has papilloedema, headache and hemi paresis - Ix?
CT brain
pt with supratentorial haemorrhage and on warfarin - INR 3.3. Given IV Vit K, what is next best thing to give
Prothrombin Complex
common conseqence of SAH
SIADH
why is LP performed 12h after symptom onset in SAH
allow time for xanthochromia (result of RBC breakdown). Helps to distinguish between bleed and traumatic LP
prevention of vasospasm in SAH
21d course of nimodipine
thrombolytic window for stroke
<4.5h after symptom onset AND exclusion of haemorrhagic stroke
locked in syndrome
basilar artery infarct
Mx stroke
Ix - non contrast CT - need to rule out haemorrhage first
then PR aspirin 300mg
thrombolyse (alteplase) if <4.5h after symptom onset and haemorrhage ruled out
2 prevention for stroke
clopidogrel + dipyridamole
brachioradialis reflex
C6
biceps brachii reflex
C5,,6
triceps reflex
C71
knee jerk reflex
L4
ankle jerk reflex
S1
Mx idiopathic intracranial HTN
AcetozolamiDE
site of lesion in inferior quadrantanopia
Parietal lobe (PITS mneumonic)
site of lesion in superior quadrantanopia
Temporal lobe (PITS mneumonic)
site of lesion in homonymous hemianopia
optic tract
site of lesion in homonymous hemianopia with macula sparing
Occipital cortex
site of lesion in bitemporal hemianopia
optic chiasm
Mx tremor in Parkinsons
anti-cholinergic e.g. procyclidine
Parkinsons drug that has been ass. with pulmonary fibrosis
cabergoline
role of DCML
vibration, fine touch & proprioception
where do fibres in DCML cross - lesion results in what symptoms
medulla
ipsilateral symptoms
where do fibres in spinothalamic cross - lesion results in what symptoms
1 or 2 above entry point
contralateral symptoms
where do fibres in corticospinal tract - lesion results in what symptoms
medulla
contralateral symptoms
L2 dermatome
ant thigh
L3 dermatome
ant knee
L4 dermatome
medial malleolus
L5 dermatome
dorsum of foot
S1 dermatome
heel