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Flashcards in Neurology Deck (64)
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1

What domains make up the Glasgow coma score?

Eye Opening:
1. none
2. to pain
3. to speech
4. spontaneous

Best motor response:
1. None
2. extension to pain
3. flexion to pain
4. withdraws from pain
6. obeys commands

Best verbal response:
1. none
2. incomprehensible sounds
3. inappropriate words
4. confused
5. orientated

2

What is the diagnosis of the worst headache of life in the back of head, coming on very quickly in a couple of seconds?

Subarachnoid haemorrhage

3

What are the causes of sub arachnoid haemorrhage?

85% are from rupture of berry saccular (berry) aneurysms
The rest are not due to aneurysms and may be due to:
arterial dissection
AV malformation
tumour
cocaine
trauma
septic aneurysm

4

Where are the common sites for berry aneurysms?

Junction of posterior communicating artery with the internal carotid.
Junction of the anterior communication artery with the anterior cerebral artery.
Bifurcation of the middle cerebral artery

5

What are the risk factors for berry aneurysms?

PKD, coaractation of aorta, Ehlers- Danons,

6

What investigations help diagnose SAH?

CT detects >90% in first 48hrs
If CT is -ve but still clinically suspicisous can do an LP at 12hrs and will have xanthochromia (yellow colour from break down of blood)

+ve for red blood cells in the LP does NOT confirm SAH as it could be due to a bloody tap.

7

How do you manage a SAH?

Referal to neuro surgery
Re examine neuro system often (GCS, pupils,)
Maintain cerebral pressure by keeping BP > 160mmHg
Nomodipine, a Ca channel antagonist, reduces vasopasm and decreases morbidity from the cerebral ischemia.

Surgery - coiling is better than clipping

8

What are the complications of SAH?

Rebleeding - occurs in 20% in the first few days

Cerebral ischemia - due to vasospasm and may cause permanent deficit

Hydrocephalus - due to blockage of the arachnoid granulations

Hyponatraemia - is common, but do not manage with fluid restriction.

9

Where is the blood coming from in a subdural haemorrhage?

Bleeding is usually from bridging veins between the cortex and the venous sinus.

The blood collects between the dura and the arachnoid layers.

10

What are the risk factors for a subdural haeorrhage?

Men
Age
Alcoholism
Epilepsy
Anti coagulant therapy
Thrombocytopenia

Usually occurs after a minor fall

11

Describe the changes seen on CT after a subdural:

The bleeding forms a sickle shape
The blood begins being hyperdense compared to the brain tissue, then in 2-3 weeks it becomes isodense an then after 3 weeks it becomes hypodense

Mid line shift may be present, and eventually the brain may herniate due to increased ICP

12

What are the symptoms and signs of a subdural?

fluctuating level of consciousness, physical and intellectual slowing, sleepiness, headache, personality change, unsteadiness.

increases ICP, seizures, localising neuro symptoms occur late

13

What classically cause extra dural bleeds?

Hit to the head over the parietal area damages the middle meningeal artery

14

What are the changes on CT seen in an extra dural bleed?

Lens shaped haematoma, with a skull fracture and mid line shift

15

What are the symptoms and signs of a extra dural bleed?

Initial LOC then recovers, followed by increasing drowsiness (lucid period)
Increasing headache, vomiting, confusion and fits. hemipariesis and ipsilateral pupil dilatation.

BP rises and HR decreases - Cushings response to increasing ICP.

16

What is motor neurone disease?

A degenerative disease characterised by selective loss of neurones in the motor cortex, cranial n nuclei and anterior horn cells

Upper and lower motor neurones are affected but sensory cells are NEVER affected (helps to distinguish from MS and other polyneuropathies)
It NEVER affects eye movements (helps distinguish from myasthenia)

Fasiculations are very common!

17

What are the 4 different clinical patterns of MND?

Amyotrophic lateral sclerosis (classic MND)
Loss of motor neurones and anterior horn cells in spinal cord - causes weakness with UMN signs and LMN wasting

Progressive bulbar palsy
Only affects cranial nerves IX - XII. LMN lesions of the tongue and muscles of talking and swallowing: flaccid fasiculating tongue, quiet hoarse voice.
Often progresses to ALS

Progressive muscular atrophy
Anterior horn cell lesions only - no UMN signs.
Affects distal muscle groups before proximal

Primary lateral sclerosis
Loss of Betz cells in the motor cortex - mainly UMN signs.
Marked spastic leg weakness and pseudo bulbar palsy (UMN lesions of muscles of swallowing and talking, slow tongue movements, slow deliberate speech, increased jaw jerk)

18

How do you diagnosis ALS?

Clinical diagnosis - El Escorial diagnostic criteria

Definite = lower + upper motor neurone signs in 3 regions
Probable = lower + upper motor neurone signs in 2 regions
Probably with lab support = Lower + upper motor neurone sign in 1 region or UMN sign in >1 region + EMG shows acute denervation in >2 limbs
Possible = lower and upper motor neurone signs in 1 region
Suspected = upper or lower motor neurone sign in 1 or more regions

19

What is myasthenia gravis?

Autoimmune disorder - antibodies to nicotinic acetlycholine receptors, results in fewer receptors on the post synaptic membrane so fewer neuromuscular transmissions can occur.

20

What are the symptoms and signs of Myasthenia Gravis?

Increasing muscle fatigue - extraocular, bulbar, neck and shoulder girdle muscles are often affected first. Patients complain of double vision and ptsosis.
Tendon reflexes are normal

Anti AChr antibodies are raised in 90%
On repetative nerve stimulation a decremental muscle response is seen

If 50yrs more common in men and associated with thymic atrophy or thymic tumour.

21

How do you treat Myasthenia Gravis?

1. Anticholinesterase (increases the amount of Ach around)
2. Prednisolone for relapses - can use azathioprine and methatrexate of needed
3. thymectomy

22

What are the differentials for generalised muscle weakness?

MND - fasciculations
Muscular dystrophies - can be selective weakness and FHx
Dystrophia myotonica - ptosis, wasting of masseter, temporal and SCM muscles. May be gondal atrophy, and mental retardation. FHx. EMG diagnostic
Polymyositis - acute or chonic, skin rash and joint pains
Miscellaneous - thyrotoxic, hypothyroid, cushing's, alcoholic
Non metastatic associations of malignancy - thymoma, small cell lung cancer (Eaton - Lambert)

23

What are the causes of vertigo?

Peripheral (labyrinth and CVIII):
Benign positional vertigo -
due to debris in the semicircular canal
lasts for less than 1min at a time
occurs when moving head
Nystagmus on Hallpike manoeurve is diagnostic
the Eply manoeurve clears the debris

Vestibular neuronitis (acute labyrinthitis)
abrupt onset
N&V, no deafness or tinnitus
caused by viruses or vascular lesion
will settle on own

Meniere's disease
endolymphatic hydrops causes recurrent attacks
each episode lasts >20mins
N&V, and tinnitus, and sensorineural hearing loss
Antihistamine can help

Ototoxicity
aminoglycosides, loop duiretics, cisplatin

Herpes zoster

Central - often have nystagmus
Brainstem ischemia
Posterior fossa tumours
MS
Alcohol/ drugs
Migraine
Epilepsy
Acoustic neuroma - Schwannoma rises from the vestibular nerve. Unilateral hearing loss and vertigo. Ipsilateral V, VI, IX and X nerve involvement. VIII is not damaged until surgery

24

What are the red flags when patients complain of a headache?

Worsening headache with fever - meningitis
Sudden onset reaching max intensity in 5mins - SAH
New onset neurological deficit
New onset cognitive deficit
New change in personality
Impaired LOC
Recent trauma
Worse when coughing sneezeing laughing - high ICP
Headache triggered by exercise
Headache that changes with posture
Symptoms suggestive of GCA or Acute angle glaucoma
Different to normal headache

25

What are the recurrent/ chronic headaches and how do they differ from each other?

TENSION TYPE:
Bilateral, pressing tightening, mild or moderate pain that doesn't aggravate with everyday activities
No associated symptoms
Lasts over 30 mins
If 15 days per month = chronic tension type

MIGRAINE:
Usually unilateral but can be bilateral
Pulsing, throbbing pain, moderate to severe that is aggravated or results in avoidance of everyday activities
Associated with sensitivity to light and N&V
Can have an aura
Can last up to 72 hours
If 15 days per month = chronic migraine

CLUSTER:
Unilateral, around face and eye. Stabbing, burning, throbbing pain that is severe and causes restlessness or agitation.
Associated with red watery eye, nasal congestion, forehead sweating, ptosis on the same side as the headache.
Can last between 15 - 180 mins
1 every other day with up to 8 in a day and more than 1 month of remission = episodic cluster
1 every other day with up to 8 in a day and not ever 1 month of remission for 12 months = continuous cluster.

MENSTRUAL
needs a headache diary to confirm
headaches occur 2-3 days before menstruation for 2 or more consecutive cycles

ANALGESIA OVERUSE:
If a headache has become worse over 3 months of using paracetamol NSAIDs etc for more than 15days a month or triptans etc for more than 10 days a month.

26

What are the differentials for an acute single episode headache?

With meningism:
Meningitis
Encephalitis
SAH

Head injury
Subdural
Extra dural

Venous sinus thromobosis - causes increased ICP

Sinusitis - pain worse when bending over

Tropical illness - malaria

Acute closed angle glaucoma

27

What symptoms does trigeminal neuralgia give you?

Paroxysms of intense stabbing pain in the trigeminal area
Usually uni lateral - triggered by washing hair, shaving, eating, talking

Usually caused by an anomalous vessel close to the nerve causing compression of the trigeminal root

28

What aspects of a history of blackouts would make you think someone was having an epileptic fit?

Attacks when asleep or lying down
Aura
Identifiable triggers (eg TV)
Altered breathing
Cyanosis
Typical tonic clonic movements
Incontinence of urine
Tongue biting
Prolonged post ictal phase
Drowsiness, confusion, amnesia
Focal paralysis (Todd's Palsy)

29

What is epilepsy?

A recurrent tendency to spontaneous, intermitted abnormal electrical activity in part of the brain - manifested a seizures.

30

What the causes of epilepsy?

2/3 are idiopathic
Structural - cortical scarring from a head injury, developmental disorder (dysemryoplastic neuropathelial tumour), space occupying lesions, stroke, hippocampal sclerosis (after febrile convulsion), vascular malformation,

Non epileptic causes of seizures:
Trauma, stroke, haemorrhage, increased ICP, alcohol or benzo withdrawal, metabolic disturbance, liver disease, infection, fever, drugs and pseudosiezures