Neurology 1 Flashcards
Name an example of a 5-HT3 antagonist
Adverse effects (2)
Ondansetron
Prolonged QT
Constipation
Absence seizure
Typical age range
Gender
Provoked by (2)
3-10yo
F>M
Stress, hyperventilation
Absence seizure
EEG:
Bilateral, symmetrical spikes and wave pattern
What is a positive Babinski?
Suggestive of upper motor neuron disease
Dorsiflexion of big toe and fanning out of the others
Lesions that can cause both absent ankle jerks and extensor plantars (Babinski) (6)
Upper and lower motor neuron disease
Subacute combined degeneration of the cord
Motor neuron disease
Friedreich’s ataxia
Synringomelia
Tabparesis (syphillis)
Conus medullaris lesion
What is Friedreich’s ataxia?
AD/AR
Age
Features other than ataxia (2)
Later features (3)
AR mitochondrial disease, trinucleotide repeat
Usually causing ataxia, HOCM and DM
Upper and lower motor neuron, absent ankle jerks, extensor plantar, optic atrophy
10-15yo
Later - heart failure, loss of vision and hearing
Receptive aphasia
Broca/Wernicke?
Where you lack comprehension, but can speak well, but none of what you’re saying makes sense because you can’t comprehend. i.e word salad
Wernicke’s aphasia
Expressive aphasia
Broca/Wernicke?
When you understand what people are saying but struggle to get the words out, speech is non fluent, repetitive and laboured.
Broca’s aphasia
What is conduction aphasia?
Usually secondary to a stroke to the arcuate fasiculus - connection between Broca’s and Wernicke’s
Comprehension is normal, aware of the errors
Repetition is poor
Speech is fluent
Global aphasia
Results in both receptive and expressive aphasia, may still be able to communicate with gestures
What is ataxia telangiectasia?
AD/AR
Age of onset
Features (3)
Increased risk of which two cancers?
AR
1-5yo
- Cerebellar ataxia
- Telangiectasia
- Recurrent chest infections secondary to IgA deficiency
- Increased risk of lymphoma and leukaemia
Explain autonomic dysreflexia
Occurs in patients who have a spinal cord injury at or above T6
Triggered by faecal impaction or urinary retention causes a sympathetic spinal reflex up the spinal cord. But due to lesion/ injury at T6 or above it is unable to deliver it all the way to the brain. This results in sympathetic activation below T6 and parasympathetic response above T6 leading to:
HTN
Bradycardia
Sweating
Flushing
Agitation
Haemorrhagic stroke
Bell’s palsy
Age range
Common in which type of patient?
Forehead or no forehead sparing?
20-40yo
Pregnant women
No forehead sparing due to lower motor neuron facial nerve palsy
Bell’s palsy features (5)
Paralysis of one side of the face including forehead
Post-auricular pain
Altered taste
Dry eyes
Hyperacusis
Bell’s palsy
Mx (2)
When to refer to ENT?
Prognosis?
- Prednisolone PO if within 72 hours of onset of symptoms
- Artifical tears and eye lubricants
If no improvement after 3 weeks
Full recovery within 3-4 months
15% have permanent weakness
What situations may cannabis based medicinal products be used?
Chemotherapy induced N&V (nabilone)
Spasticity in adults with MS (sativex nasal spray)
Partial seizures
1st line mx
Carbamazepine
SE carbamazepine (3)
What is autoinduction?
Leucopenia and agranulocytosis
Hyponatraemia secondary to SIADH
Visual disturbances
May see a return of seizures after 3-4 weeks of treatment
What is cataplexy?
What condition is it associated with?
Sudden and transient loss of muscular tone caused by a strong emotion
2/3 of patients with narcolepsy have cataplexy
What is Charcot-Marie-Tooth disease?
Features (6)
Most common form of hereditary peripheral neuropathy
AD
Features:
Foot drop (frequently sprained ankles)
Pes cavus (high arched feet)
Hammer toes
Stork leg deformity
Hyporeflexia
Distal muscle weakness and atrophy
Cluster headaches
Trigger (1)
Mx acute (2)
Chronic (1)
ETOH
Mx
Acute 1. 100% oxygen, 2. SC triptan
Chronic 1. Verapamil
Foot drop is secondary to which nerve lesion?
Other features for this nerve lesion (3)
Common peroneal
Loss of dorsiflexion
Loss of eversion
Sensory loss of dorsum of the foot
Type I and Type II complex regional pain syndrome
Complex regional syndrome pain syndrome mx (3)
Type I - no demonstratable lesion to a major nerve
Type 2 there is a lesion to a major nerve
Physiotherapy
Neuropathic analgesia
Pain team
CN
I
II
V
I smell
II sight
V (trigeminal) facial sensation, muscles of masticatio
CN
III occulomotor
IV trochlear
VI abducens
Eye movement
III - MR, IO, SR, IR, constriction, accommodation, eyelid opening
IV - SO
VI - LR
Clinical signs with lesions on
Trigeminal (2)
Occulomotor (2)
Abducens (1)
Trochlear (2)
Trigeminal neuralgia, loss of corneal reflex
Occulomotor down and out eye, dilated fixed pupil
Abducens Horizontal diplopia
Trochlear downward gaze, vertical diplopia
CN
VII
VIII
IX
Function
Facial anterior 2/3 of tongue, lacrimation, salivation
Vestibulocochlear hearing balance
Glossopharyngeal posterior 1/3, swallowing
CN 10-12 function
X vagus gag reflex
XI accessory head and shoulder movement
XII hypoglossal tongue movement
Clinical signs
CN 7 (3)
CN 8 (2)
CN 9 (1)
7 loss of corneal reflex, taste, hyperacusis
8 hearing loss, vertigo
9 loss of gag reflex
Clinical signs 10-12
10 uvula deviates away from site
11 weakness turning head to contralateral side
12 tongue deviates towards side of lesion
Corneal + Lacrimation reflex afferent efferent
v1 trigeminal ophthalmic VII facial nerve