Neurology Flashcards
What are the causes of pes cavus?
Charcot Marie Tooth Disease Fredrick’s Ataxia Spina Bifida Muscular dystrophies Cerebral palsy Spinal muscular atrophy Spinal cord tumours
What level is the biceps and brachioradialis reflex?
C5/6
What level is the triceps reflex?
C7/8
Weakness in big toe extension suggests what?
L5 nerve lesion
What are the features of Brown Sequard Syndrome?
Ipsilateral spastic paralysis
Ipsilateral loss of vibration and proprioception
Contralateral loss of pinprick sensation
What are the causes of a small stepped gait?
Parkinson’s disease Vascular Parkinson’s disease Normal pressure hydrocephalus Multi lacunar state (Later three have wide base)
Striata hand deformity description?
Flexion of MCP
Extension of PIP
Flexion of DIP
What are the three types of horners syndrome?
First order - sympathetic tract
Second order - preganglionic
Third order - internal carotid artery
What are the cardinal signs of horners syndrome?
Ptosis
Miosis
Anhidrosis
What is the path of sympathetic fibres to the eye?
First order - Hypothalamus to first synapse C8 to T2
Second order - sympathetic trunk through brachial plexus ascending to superior cervical ganglion
Third order - ascends within adventitia of ICA and joins V1
Causes of first order neuron horners syndrome?
Lateral medullary syndrome Strokes affecting sympathetic outflow Tumours Demyelination disease Syringomyelia Cervical cord trauma
Causes of second order neuron horners syndrome?
Trauma or surgery of
- Spinal cord
- Thoracic outlet
- Lung apex
Causes of third order neuron horners syndrome?
ICA dissection
ICA thrombosis
cavernous sinus aneurysm
What are the causes of Parkinsonism?
Idiopathic Parkinson’s disease Parkinson’s plus syndromes Medications - metoclopramide Toxins - manganese Basal ganglia tumours Levy body dementia Dementia pugilistica Normal pressure hydrocephalus
What are Lewy bodies and what are they found in?
Spherical eosinophilia a-synuclein inclusions.
Can be present in
- Parkinson’s disease
- Lewy Body Dementia
- Alzheimer’s Disease
- Hallervorden Spatz Disease
What is hallervorden spatz Disease?
Autosomal recessive disorder characterised by dementia, Parkinsonism and retinitis pigmentosa.
What re the features suggestive of Parkinson plus syndromes?
Symmetrical onset Vertical gaze palsy Early falls Early autonomic failure Early onset dementia Early onset hallucinations Cerebellar signs
What are the features of essential tremor that distinguish it from Parkinson’s?
Symmetrical tremor Worse with movement Not associated with bradykinesia Involves the head Writing gets larger not smaller
What are the features and types of MSA?
Parkinsonism with early autonomic failure, cerebellar and pyramidal signs.
MSA-P - Parkinson’s predominant
MSA-C - cerebellar
Shy Drager - autonomic failure
What are the features of progressive supranuclear palsy
Symmetrical Parkinson’s Axial rigidity Prominent falls Speech and swallowing difficulties Frontal symptoms Vertical gaze palsies
What are the features of corticobasal degeneration.
Limb apraxia Cortical sensory loss Alien limb phenomenon Myoclonus Dementia
What are the findings of a bulbar palsy?
Lower motor neuron disorder of cranial nerves 9-12.
Flaccid dysarthria
Reduced gag reflex
Fasciculations of the tongue
Reduced jaw jerk
What are the causes of a bulbar palsy?
Motor neurone disease Syringobulbia Poliomyelitis Myasthenia Gravis Guillain Barre Syndrome
What are the features of a pseudobulbar palsy?
UMN lesion of cranial nerves 5,7,9,10,11,12.
Features include: Spastic dysarthria Exaggerated gag reflex Shrunken and stiff tongue Exaggerated jaw jerk Emotional lability Expressionless face
What are the causes of pseudobulbar palsy?
Motor neuron disease
Bihemispheric vascular disease
Brainstem tumour
Multiple sclerosis
What are the causes of myasthenic bulbar palsy?
Botulism
Myasthenia gravis
What causes myopathic bulbar palsy?
Muscular dystrophy
Polymyositis
What is the most common phenotype of musk positive myasthenia gravis?
Female Ocular Disease Respiratory muscle weakness Bulbar myasthenia Neck weakness
What medications can worsen myasthenia?
Penicillamine Aminoglycosides Fluoroquinolones Macrolides B-blockers Quinidine Lithium
In myasthenia, what other features would you examine for?
- Immunosuppression (steroids)
- Thymectomy scar
- Autoimmune disease
- T1DM (skin pricks, neuropathy)
- hyperthyroidism (tachycardia, tremor, graves)
- rheumatoid or SLE
- hypothyroidism (slow ankle jerk, bradycardia)
What are differentials for myasthenia gravis?
Botulism Lambert Eaton Myasthenic Syndrome Mitochondrial myopathy Miller Fisher Syndrome Snake bite (cobra)
What are the features of Lambert Eaton Myasthenic SYndrome?
Antibodies against voltage gated calcium channels most commonly associated with SCLC.
Proximal muscle weakness with post exercise facilitation.
Reduced tendon reflexes
Incremental improvement with RNS
What are the indications for thymectomy in a patient with myasthenia?
- Thymoma
2. Generalised myasthenia and <60 years of age
What are the different types of CMT disease?
CMT 1 - demyelination PNS disease
CMT2 - axonal PNS Disease
What are the features clinically of CMT1?
Peripheral motor and sensory neuropathy
Classical presenting with sprained ankles, reduced reflexes, Pes cavus and reduced vibration and proprioception.
What are the features clinically of CMT2?
The classic features of CMT2 include distal weakness, atrophy, sensory loss, decreased deep tendon reflexes and variable foot deformity.
What is the most common genetic defect in Charcot Marie tooth?
Peripheral myelin protein 22 on chromosome 17
What is hereditary neuropathy with liability to pressure palsy?
Autosomal dominant disorder related to PMP22 deletion resulting in isolated nerve palsies in areas liable to compression.
What are the causes of a positive rombergs test?
Inherited - Fredricks ataxia - ataxic neuropathies Metabolic and Toxic - B 12 deficiency - vitamin E deficiency - medication related (cisplatins, vincristine) - pyridoxine excess Immunologic - Gillian barre - CIDP Infective - Tabes dorsalis
What are the causes of unilateral pes cavus?
Malunion of calaneal fracture Burns Poliomyelitis Spinal trauma Spinal cord tumours Compartment syndrome Stroke
What are the causes of bilateral pes cavus?
Friedrichs ataxia Muscular dystrophy Spinal muscular atrophy Cerebral palsy Syringomyelia Hereditary Spastic Paraparesis Spinal cord tumours Charcot Marie tooth
What are the differential diagnosis for MND?
Syringomyelia Cervical Myelopathy Multifocal motor neuropathy Inflammatory myopathies Hyperthyroidism
What are the differentials for MND presenting with only UMN signs?
HIV related myelopathy
Spinal Cord Tumour
Syringomyelia
Cervical myelopathy
What are the differentials for MND presenting with only LMN signs?
Multifocal motor neuropathy
Chronic Inflammatory Demyelinating Polyneuropathy
Spinal Muscular Atrophy
Occulopharyngeal muscular dystrophy
What are the trinucleotide repeat disorders?
Myotonic Dystrophy Fragile X syndrome Huntington’s Chorea Friedrichs Ataxia Spinocerebellar ataxia
What are the cardiovascular complications of myotonic dystrophy?
Ecg Changes Arrhythmias Conduction defects Mitral valve prolapse Cardiomyopathy
What are the endocrine complications of myotonic dystrophy?
Diabetes Mellitus
Hypogonadism
Nodular Thyroid Enlargement
What are the gastroenterological complications of myotonic dystrophy?
Dysphagia Reflux Delayed gastric emptying malabsorption Megacolon Bacterial Overgrowth
What are the respiratory complications of myotonic dystrophy?
Weakness of respiratory muscles
Respiratory failure following anaesthesia
Pneumonia
What are the differentials for distal muscle wasting and weakness?
Myotonic dystrophy Hereditary motor sensory neuropathy Inclusion body myositis Distal spinal muscle atrophy Finish distal myopathy Markesbury distal myopathy Welander distal myopathy
What are the causes of a sensorimotor polyneuropathy?
endo - diabetes, hypothyroid
Toxins - Alcohol, Uraemia
Autoimmune - GBS
Inflammatory - mononeuritis multiplex, vasculitis, paraneoplastic
Infiltrative - sarcoidosis
Hereditary - HMSN, CMT
Medications (vincristine, cisplatin, amiodarone)
What are the causes for a motor neuropathy?
Porphyria Lead poisoning Diphtheria CIDP AIDP Medications (dapsone)
What are the common causes of sensory neuropathies?
Alcohol Diabetes Hypothyroidism Uraemia Sarcoidosis Vasculitis Paraneoplastic Amyloidosis B12 deficiency Medications (isoniazid, colchicine, metronidazole)
What are the causes of autonomic neuropathy?
GBS Botulism Porphyria Paraneoplastic Diabetes Chagas’ disease HIV Amyloidosis
What are the causes of a small fibre neuropathy?
Diabetes Alcohol Amyloidosis Leprosy Heavy metals (gold, arsenic) Hypothyroidism Sjogrens Syndrome Primary biliary cirrhosis HIV Medications (cisplatin, disulfuram, metro)
What are the causes of demyelinating polyneuropathies?
CIDP Myeloma MGUS HSMN HNPP POEMS syndrome Multifocal motor neuropathy HIV
What are the three mechanisms of peripheral neuropathy.
Wallerian Degeneration
Axonal degeneration
Segmental demyelination
What are the causes of mononeuritis multiplex?
Diabetes Polyarteritis Nodosa Churg Strauss Syndrome Wegeners granulomatosis Rheumatoid SLE Sjögren’s syndrome Sarcoidosis Lymphoma Amyloidosis Lyme disease Leprosy
What are the emg findings of myopathies?
Small amplitude
Polyphasic
Rapid recruitment
What are the features on emg of neuropathy?
Large amplitude Reduced recruitment Late recruitment Fibrillations Positive sharp waves
What side is the pathology in an INO relative to the eye that cannot Adduct?
Ipsilateral
What are argyll Robertson pupils?
And what are the causes?
Pupils that accomodate but do not construct.
Neurosyphilis Diabetes Midbrain lesion (Tumour, infarct, demyelination) Lyme disease Wernickes Brainstem encephalitis
Causes of Lhermitte’s sign
Multiple sclerosis
Cervical myelopathy
Cervical Cord Tumour
Subacute Combined Degeneration of the Cord
What is Uhtoffs Phenomenon?
Heat induced worsening of MS symptoms. Though to be related to heat induced conduction block or partially demyelinated fibres
Causes of internuclear opthalmoplegia.
Multiple sclerosis Brainstem lesions Wernickes encephalopathy Miller Fischer Syndrome SLE
What are the csf findings in MS?
Normal Glucose
lymphocytosis
Normal protein
Oligoclonal bands
What are the causes of oligoclonal bands?
Multiple sclerosis Neurosarcoidosis Neurosyphilis CNS lymphoma Neuromyelitis optica Acute disseminating encephalomyelitis Progressive multifocal leucoencephalopathy Guillain Barre Syndrome
What are the causes of spastic paraparesis with dorsal column signs?
Multiple sclerosis Subacute combined degeneration of the Cord Tabes Dorsalis Friedreichs Ataxia Cervical myelopathy
What are the causes of transverse myelitis?
Bacterial infections Viral infections Demyelination Radiation myelopathy Anterior spinal artery occlusion Vasculitis
What is the treatment for spasticity?
Non pharm - physio (stretching, strengthening) - orthoses, braces - electrical stimulation Pharm - Benzos, baclofen - clonidine, gabapentin - botulinum injections Surgical - contracture release - tendon transfer - osteotomy
What are the causes of cervical myelopathy?
Cervical degenerative disc disease
Cervical Cord tumours
Ossification of posterior longitudinal ligament
Trauma
Where is pathology commonly located in the setting of downbeat nystagmus?
Foramen magnum
What are the causes of downbeating nystagmus?
Arnold Chiari Malformation Tumours Syringobulbia Platybasia Spinocerebellar degeneration Vertebrobasilar infarction Wernickes Alcohol related Lithium toxicity Vitamin b 12 deficiency
Where is the pathology in upbeat nystagmus?
Anterior vermis of cerebellum
What are the causes of upbeat nystagmus?
Organophosphate poisoning Anticonvulsants Wernickes Encephalopthy Encephalitis Meningitis
What are the structures of the cavernous sinus?
Nerves 3,4,5(a/b),6
Sympathetic carotid plexus
Intracavernous carotid artery
What are the causes of cavernous sinus syndrome?
Thrombosis Aneurysms Carotico-cavernous fistula Tumours Trauma Inflammation/infection.
What are the features of a cavernous sinus lesion?
Unilateral 3,4,6 nerve palsies Sensory loss in Va and Vb Loss of corneal reflex Painful ophthalmoplegia Proptosis Conjunctival congestion Visual loss Papilloedema Retinal haemorrhage
What are the causes of upgaze palsy?
PSP Miller Fischer Myasthenia gravis Graves ophthalmopathy Muscular dystrophy
What are the causes of a bitemporal hemianopia?
Pituitary tumour Craniopharyngioma Suprasellar meningioma Glioma Granuloma Metastasis
What are the causes of dissociated sensory loss?
Syringomyelia
Anterior spinal artery occlusion
Small fibre neuropathies
What are the causes of unilateral ptosis?
3rd nerve palsy
Horners syndrome
Myasthenia gravis
Congenital
What are the causes of bilateral ptosis?
Myasthenia gravis Myotonic dystrophy Tabes dorsalis Bilateral horners syndrome Miller Fischer Syndrome Chronic progressive external ophthalmoplegia
What are the causes of a abducens nerve palsy?
Increased intracranial pressure Space occupying lesion Cavernous sinus pathology Trauma or surgery Basilar artery aneurysm Ischaemic or vasculopathic Demyelinating Idiopathic
What are the causes of proximal muscle weakness?
Inherited myopathies - muscular dystrophy, congenital myopathies
Neurologic - spinal muscular atrophy, amyotrophic lateral sclerosis, BGS
Metabolic - hypokalaemia, nutritional deficiencies, glycogen storage disorders
Endocrine - thyroid disease, Cushings disease, calcium disturbance
Drug induced - statins, steroids, amiodarone, zidovudine
Myositis - autoimmune or viral
Rhabdomyolysis - traumatic
What are the clinical features of multi focal motor neuropathy?
Subacute asymmetric weakness without sensory loss. Fasciculations and atrophy occurs late in the disease.
What are the investigation results of multifocal motor neuropathy?
Ganglioside antibody positive
Normal CSF
Motor conduction block
What is the treatment of multifocal motor neuropathy?
IVIG
What are the MRI features of corticobasal degeneration?
Asymmetric atrophy of posterior frontal and parietal lobes.
What are the imaging findings in PSP?
Hummingbird sign
Mid brain atrophy
What are the Imaging findings of MSA?
Hot cross bun sign
What are the features of myotonic dystrophy?
Myopathies facies Frontotemporal Baldness Ptosis Wasting of facial muscles Difficulty opening eyes after closure Distal upper limb wasting and weakness Grip myotonia Percussion myotonia Loss of reflexes
What are the extra neurological manifestations of myotonic dystrophy?
Diabetes Hypogonadism Goitre Cardiomyopathy Valvular heart defect Arrhythmia
Describe the lateral medullary syndrome.
Ipsilateral Horners
Vertigo and diplopia
Ipsilateral sensory facial loss
Contralateral loss of pain and temperature in upper and lower limb
Describe the one and half syndrome.
Horizontal gaze palsy with impaired adduction on the same side.
What causes the one and half syndrome?
Dorsal pontine lesion
- vascular
- space occupying
- demyelination
Causes of pupillary construction.
Horners syndrome Argyll Robertson pupil Pontine lesion Narcotics Older age
Causes of dilated pupil?
Third nerve palsy Congenital Adies pupil Iridectomy Traumatic
What are the findings in an Adies Syndrome?
Dilated pupil
Absent reflexes to light
Poor accomodation
Decreased tendon reflexes
What causes Adies syndrome?
Lesion of efferent parasympathetic pathway.
What are the causes of 6th nerve palsy?
Raised intracranial pressure
Mononeuritis multiplex
Traumatic
Wernickes Encephalopathy
Describe the Parinaud Syndrome.
Vertical gaze impairment
Convergence nystagmus
Pseudo Argyll Robertson Pupils
Causes of parinaud syndrome?
Central (dorsal midbrain lesion)
- pineal gland Tumour
- multiple sclerosis
- vascular insult
- traumatic
- space occupying lesion
- raised ICP
Causes of trigeminal nerve palsy.
Central - vascular - space occupying - demyelination Peripheral - aneurysm - space occupying lesion - trauma - cavernous sinus pathology
What are the causes of a cavernous sinus pathology?
Aneurysm
Thrombosis
Tumour
Causes of 7th nerve palsy?
UMN - vascular insult - space occupying - demyelination LMN - parotid Disease - traumatic/surgical - Bell’s palsy - Ramsay hunt syndrome - space occupying lesion (neuroma) - pontine insult (same as for UMN)
What is Ramsay Hunt Syndrome?
Peripheral facial nerve palsy with vesicular rash of the ear canal.
What is the treatment of Ramsay Hunt Syndrome?
Oral corticosteroids
Oral aciclovir
Neuropathic pain medications
Causes of optic neuropathy?
Ischaemic Optic Neuropathy - arteritic and non arteritic causes Optic Neuritis - demyelination - infections - inflammatory - genetic Neoplasm - optic glioma - meningioma Compression - thyroid eye disease - abscess - artery aneurysm Metabolic - drugs and toxins - nutritional deficiency - vit B1, B12, folate Hereditary - lebers optic neuropathy
What are the causes of an Argyll Robertson Pupil?
Neurosyphilis Diabetes Midbrain lesion Wernickes encephalopathy Brainstem encephalitis
What are the causes of bilateral ptosis?
Myaesthenia Gravis Myotonic dystrophy Tabes dorsalis Bilateral horners Bilateral 3rd nerve palsy Myopathies (Chronic progressive external ophthalmoplegia) Miller Fischer Syndrome
What are the features of a cerebellar dysarthria?
Slurred and indistinct
Jerky and explosive
Slow and scanning
What are the features of a pseudobulbar dysarthria
Harsh vocal quality
Rigid articulation muscles
Spastic dysarthria
What are the features of a bulbar dysarthria?
Weak voice
Low volume with nasal quality
Slurring of consonants
What are the features of an extrapyramidal dysarthria?
Slow and monotonous
Frequent pauses
Hypokinetic
What are the causes of Brown Sequard?
Demyelination Transverse myelitis Trauma Vascular insult Space occupying lesion (Tumour or infection)
What are the features of a Wernickes aphasia and where is the lesion?
Fluent aphasia
Impaired comprehension and repetition
Paraphasias
Temporal lobe dominant lesion
What are the features of a Brocas aphasia and where is the lesion?
Non fluent speech
Intact comprehension
Impaired repetition
Posterior dominant Frontal lobe
What are the features of a global aphasia? Where is the lesion?
Non fluent aphasia
Impaired comprehension
Impaired repetition
Dominant MCA territory
What are the features of a conduction aphasia? Where is the lesion?
Fluent aphasia
Intact comprehension
Impaired repetition
Dominant arcuate fasciculus
What are the findings in a cerebellopontine angle lesion?
Cranial nerve 5,6,7,8 palsy
Unilateral cerebellar signs
What are the causes of a cerebellopontine angle lesion?
Acoustic neuroma Meningioma Medulloblastoma Metastasis Basilar artery aneurysm
Causes of pes planus
Charcots arthropathy Arthritis Ligamentous laxity (marfans/ehlers danlos) Trauma Congenital
Causes of pes cavus
Charcot Marie tooth Fredriechs Ataxia Hereditary sensorimotor neuropathy Poliomyelitis Cerebral palsy Syringomyelia
Bulbar palsy
What would you like to do to finish your exam?
Spirometry
Sip test
Lying and Standing MEPs
What are the causes of oculomotor nerve palsy?
Vascular Space occupying lesion Demyelination Posterior com artery aneurysm Cavernous sinus pathology
What are the differentials for lower limb spasticity with hyperelfelxia?
Hereditary spastic paraparesis MND Syphilis HIV Spinocerrebellar ataxia Multiple Sclerosis
What is the mechanism of small fibre neuropathy?
Damage to small myelinated (A delta) and small in myelinated C fibres.
What are the causes of small fibre neuropathy?
Endocrine - diabetes Autoimmune - SLE, Sjogrens, coeliac Disease Inflammatory - amyloidosis, sarcoidosis Metabolic - Fabrys, B12 deficiency Infectious - HIV Toxic - chemotherapies, ETOH