Neurology Flashcards
Biceps reflex
C5, C6, musculocutaneous nerve
Triceps reflex
C7, C8, radial nerve
Wrist reflex
C5, C6, radial nerve
Finger reflex
C8, ulnar nerve
Knee reflex
L3, L4, femoral (3, 4, kick the door)
Ankle reflex
S1, S2, tibial
UMN
Hypertonia Brisk reflexes Mild-mod weakness Muscle bulk normal No fasciculation
LMN
Hypotonia Reduced/absent reflexes Severe weakness Atrophic muscles Fasciculation
CNI
Olfactory
Sensory - nose
CNII
Optic
Sensory - eye, afferent pupillary defect, visual fields, fundoscopy
CNIII
Occulomotor
Motor - all muscles of the eye except superior oblique
Pupillary light reaction
CNIV
Troclear
Motor - superior oblique SO4 eye in
CNV
Trigeminal
Sensory - face
Motor - muscles of mastication
CNVI
Abducens
Motor - lateral rectus LR6 eye out
CNVII
Facial
Motor - muscles of the face, taste anterior 2/3
CNVIII
Vestibulocochlear
Sensory - inner ear
CNIX
Glossopharyngeal
Motor - pharyngeal musculature - swallowing, taste posterior 1/3 tongue
CNX
Vagus
Motor - heart, lungs, bronchi,GIT
Sensory - heart lungs, trachea, larynx, pharynx, GIT, external ear
CNXI
Accessory
Motor - sternocleidomastoid, trapezius
CNXII
Hypoglossal
Motor - muscles of the tongue
Cavernous sinus
III occulomotor
IV trochlear
V trigeminal
IV abducens
Myotomes - C4
Shrug shoulders
Myotomes - C5
Shoulder abduction
Myotomes - C6
Elbow flexion, wrist extension
Myotomes - C7
Elbow extension, wrist flexion
Myotomes - C8
Thumb extension, finger flexion
Myotomes - T1
Finger intrinsics (abduction/adduction)
Myotomes - L2
Hip flexion
Myotomes - L3
Knee extension
Myotomes - L4
Ankle dorsiflexion, ankle inversion
Myotomes - L5
Big toe dorsiflexion
Myotomes - L5, S1
Ankle eversion
Myotomes - S1, S2
Plantar flexion, knee flexion, hip extension
Dermatomes - C2
Skull cap
Dermatomes - C3
Neck collar
Dermatomes - C5
Shoulder
Dermatomes - C6
Lateral forearm + thumb
Dermatomes - C7
Middle finger
Dermatomes - C8
Little finger
Dermatomes - T1
Medial elbow
Dermatomes - T4
Nipple line
Dermatomes - T10
Umbilicus
Dermatomes - T12
Suprapubic
Dermatomes - L1
Inguinal
Dermatomes - L2
Anterior thigh (pockets)
Dermatomes - L4
Anterior thigh, knee, medial lower leg
Dermatomes - L5
Lateral lower leg, dorm of foot, plantar surface of fott
Dermatomes - S1
Posterior leg, side of foot
Dermatomes - S2
Posterior leg
Dermatomes - S3
Sitting area
Dermatomes - S4, S5
Around anus
6th nerve palsy CN6
Affected eye turned in
If can straighten eye on cover test NOT a 6th nerve palsy
(*tumour - medulloblastoma, brainstem glioma, raised ICP, meningitis, post infection)
Facial nerve palsy UMN CN7
Bottom half of contralateral face
Loss of taste anterior 2/3 tongue
(arterial hypertension, infection, raised ICP)
Bell’s Palsy LMN CN7
Whole ipsilateral face Taste anterior 2/3 tongue Can't close eye Flattening of forehead creases (EBV, HSV, Ramsay Hunt)
Musculocutaneous Nerve Palsy C5/C6
Can’t flex elbow
Loss of sensation lateral forearm
Weak biceps reflex
(fractured neck of humerus)
Axillary Nerve Palsy (C5/C6)
Can’t flex elbow
Can’t abduct/rotate shoulder
Loss of sensation lateral arm posterior shoulder
(shoulder dislocation, crutches)
Erb’s Palsy (C5/C6/C7)
Can’t flex elbow
Can’t abduct shoulder “waiter’s tip”
(birth trauma, backpack)
Klumpke’s Palsy C8/T1
Claw hand
Can get Horner’s also
(birth trauma/underarm injury)
Radial Nerve Palsy C7/C8
Wrist drop Can't extend elbow/fingers Numbness dorsal (posterior hand) Numbness anatomical snuff box Weak triceps reflex (hummers fracture)
Median Nerve Palsy C6-T1
Weak opposition thumb + finger Weak wrist flexion Sensation palmar surface of lateral 3 digits Thenar eminence wasting Absent finger jerk reflex (supracondylar fracture, carpal tunnel)
Ulnar Nerve Palsy C8/T1
Finger abduction/adduction (paper between thumb and second digit)
Sensory 4th and 5th fingers
Intrinsic muscles wasted
(trauma)
Long thoracic nerve palsy C5-C7)
Winged scapula
backpack, cardiac surgery
Common perineal nerve palsy L4-S1
Foot drop with intact reflexes
Can’t walk on heels
(trauma/compression)
Sciatic nerve L4-S2
Foot drop with absent reflexes
Loss of sensation lateral lower leg
(spinal, trauma)
Tibial nerve palsy
Can’t walk on Toes
Reduced sensation sole of foot
(trauma/compression)
Femoral nerve palsy
Weak knee extension
Hip flexion
Absent knee jerk
Reduced sensation inner leg and thigh
Horners (sympathetic trunk)
Ptosis, mitosis (constriction)
Anhidrosis (dry skin)
Think neuroblastoma, lymphoma at lateral neck/peck of the lung
Brachial plexus trauma
Polymicrogyria
Overfolding
Seizures, ID/Dev delay
PMG + normocephaly - Tubulin genes
PMG + microcephaly - WDR62, CMV
PMG + macrocephaly - mTOR pathways
Schiezencephaly
Gap from ventricle to cortex
Lissencephaly
Smooth brain, lack of gyri (due to defective neuronal migration)
LIS1
- Ch17 mutation
- More common
- Posterior brain worse - agyria
- (Miller Decker if LIS1 deleted - more severe)
DCX
- X linked
- Males
- Most severe
- Anterior brain worse - styria
Cobblestone
- AR
- Irregular cortex + muscle dystrophy
- High CK
Subcortical band heterotopia
DCX mutation Mostly females Disorder of neuronal migration Grey/white/grey Seizures ID Developmental delay
Periventricular nodular heterotopia
Nodules along ventricle
Males die in utero
Seizures, normal/mild ID
Cortical dysplasia
Gyral irregularities
mTOR pathyway
Associated TS
Seziures
Chiari malformation
Type 1 most common, foramen magnum, can block CSF
Type 2 associated with myelomeningocele
Agenesis corpus callosum
Most common congenital
85% normal
Worse if other abnormality
Dandy Walker
Agenesis corpus callosum, hydrocephalus
Adrenoleukodystrophy
X linked
5-10yo
MRI: symmetrical posterior white matter changes
Measure VLCFA ratio
Seizures, gait disturbance, spastic quadriparesis, swallowing difficulty
Adrenal insufficiency ATCH excess -> brown gums
Metachromatic leukodystrophy
12-18mo
Unable to walk - ataxia, reduced reflexes, spasticity, developmental regression, seizures
MRI: anterior + posterior bilateral symmetrical white matter changes
Krabbe
AR
Fatal, death by 2
Seizures, deaf, blind
Leigh
Mitochondrial Infantile seizures, hypotonia Deteriorate with viral illness MRI: white patches with holes in brain Increased CSF and blood lactate
DMD
X linked
Dystrophin gene deletion/point mutation -> non functioning protein (BMD partially functioning)
Gonadal mosaicism
Carrier females mild weakness, cardiomyopathy, mild high CK
Presents 3-7yo, motor delay, proximal myopathy, towers positive, calf hypertrophy, dilated cardiomyopathy
Dx: DNA analysis, PCR
Muscle biopsy gold standard if PCR neg CK >15000
BMD
X linked recessive
Dystrophin mutation -> reduced or partially functioning protein
3-10yo, can walk until 14, cardio=myopathy less common, cardiac conduction abnormalities worse
Dx: DNA/PCR, muscle biopsy, CK
Myotonic dystrophy
AD Triplet repeat disorder Congenital - Birth-10yo Type 1 - 10-30yo Fish mouth, high arched palate Progressive weakness, distal muscle wasting *different to other myopathies*, slurred speech, myotonia - can't relax after contraction e.g. fist/handshake (check parent's handshake), dilated cardiomyopathy, cataracts
Congenital myotonic dystrophy
Poor foetal movements
Polyhydramnios
Won’t breath from birth
SMA
5q11 Anterior horn cell degeneration Regression, proximal myopathy fasciculations, no reflexes Hypotonia with facial sparing CK normal
Type 1: most severe, never sit, frog posture, wrist drop
Type 2: never stand, can suck and swallow
Type 3: presents later, shoulder girdle problems
Central Core Myopathy
Facial trunk weakness
Associated with malignant hyperthermia
CK normal
NADH stain
Congenital Myopathy
Hypotonia
From Birth
Demaline
Fairy disease
Hereditary motor-sensory neuropathy
Telangiectasia
Blood group AB or B worse
Lesch Nyan
Purine metabolism Extrapyramidal signs Self mutilation ~2yo (biting lips), low IQ High uric acid urine + blood Allopurinol
Retts
X linked dominant (boys die) Girls affected MECP2 gene, mostly sporadic Normal 6 mo then regression - language*, hand movements, gait Hand wringing, stereotyped movements Seizures, ataxia
Pompe
Profound hypotonia with facial sparing Areflexia Big tongue, big heart, big liver High CK Enzyme replacement
ADEM
Destroys myeline
Flair MRI
IVIG
Cerebral abscess
RF congenital heart disease
Staph/strep
Fever, seizures, headaches
CT ring enhancing lesion with contrast
Post infection cerebellits
2/52 after varicella/virus
Well
Rapid onset ataxia, nystagmus
Normal strength, reflexes
Charcot Marie Tooth
Foot drop, areflexia, deformity Peripheral neuropathy (tone, reflexes, sensation) CMT1A Normal CK No Rx
Freidrich Ataxia
Poor tone/reflexes
Cardiomyopathy
DM
Dermatomyositis
5-10yo
Symmetrical muscle weakness, heliotrope rash, grotton papules, malar rash, nailed capillary changes
Normal/high CK, ANA + ESR normal
Polymositis
Inflammatory myopathy
Proximal weakness then progresses
No rash
Langerhans cell histiocytosis
Ping pong skull osteolytic bone lesions on skull
Cutaneous lesions
Recurrent sinopulmonary infecitons
Optic neuritis
Rapid decline vision loss one eye
Pain on movement
Caused by MS, post viral
Steroids if known MS
Guillan Barre
Immune mediated polyneuropathy Campylobacter, mycoplasma Reflexes go first, weakness, motor > sensory ascending hrs - days High CSF protein Rx: IVIG, plasmapheresis (not steroids)
Miller Fischer
Like GBS
Areflexia, ataxia, ophthalmoplegia
Botulism
3/52-6/12
Hypotonia, loss of reflexes, dilated pupils (bilateral CN dysfunction)
NF1
Neurocutaneous
AD/50% sporadic
Order of appearance:
- Cafe au last spots >6
- Plexiform neurofibromas
- Axillary freckling (childhood)
- Lisch nodules: harmatomas in iris (childhood)
- Optic gliomas
- Neurofibromas (appear later)
- Skeletal - cortical thinning or sphenoid dysplasia
- Family history (first degree relative)
Associates: scoliosis, ADHD, seizures, Wilms, Moya Moya, hypertension, CoA, pectus excavatum
NF2
Neurocutaneous
AD Presents later Bilateral acoustic neuromas Hearing loss, ataxia Complication: spinal tumour
Tuberous sclerosis
Neurocutaneous
2/3 sporadic TSC1 Harmatin, TSC2 Tuberin (severe) >3 Ash leif macules, seizures (infantile spasms), low IQ In order: - Ash leaf - Forehead plaque - Sebaceous adenoma (acne like modules on face) - Shagreen patch - Subungual - Periungal fibromas
Other: cardiac rhabdomyoma, cortical tubers, giant cell astrocytoma, retinal haematoma
CXR, baseline ECHO, renal US, MRI
Ataxia Telangiectasia
Neurocutaneous
AR
ATM gene, high AFT
Ataxia/nystagmus/oculomotor apraxia, telangiectasia
IgA, B+T cell defects - recurrent sinopulmonary infections, lymphoma
Sturge Weber
Neurocutaneous
Sporadic
Port wine stain on face + seizures, glaucoma, developmental delay
Proximal weakness
Myopathy
Distal weakness
Neuropathy
Central scotoma (visual fields)
Think MS
Toddler self mutilating
Think Lesch Nyan (high uric acid, allorpurinol)
Fasciulations
SMA
Infantile spasms, cutaneous
TS
Symmetrical weakness + absent reflexes
GBS
Girl with regression, speech, hand movements
Rett
Benign Rolandic Seizures
Benign childhood epilepsy with centrotemporal spikes (BCECTS)
4-10yo
Most common M>F
On awakening
Simple partial (unilateral, face) can become secondarily generalised
Precipitated by lack of sleep
EEG: central temporal spike and wave (waves only in temporal leads)
No treatment
Resolve my adolescence
Absence seizures
4-9yo F>M 15% FHx 95% resolve by adolescence Sudden motor cessation, no aura, can have >100/day Precipitated by hyperventilation Disrupts learning 3Hz spike and wave (waves in all leads) Ethosuxamide childhood Valproate/lamotrigine for late onset NOT carbamazepine - can bring on GTCS
Juvenile myoclonic epilepsy (Janz)
Adolescence, FHx 50%
Myoclonic/GTCS
Early morning jerking or clumsiness
Precipitated by sleep deprivation, alcohol, photo stimulation
Unlikely to grow out of
EEG 4-6Hz poly spike wave sleep deprived
Tx: valproate, leviteracitam, lamotrigine (teenage girls)
Avoid carbamazepine, phenytoin - makes GTCS worse
Generalised epilepsy with febrile seizures
SCN1A
Dravet syndrome
SCN1A* Severe myoclonic epilepsy of infancy Triggered by fevers/vaccinations Developmental delay Refractory Ketogenic Poor outcome
Ottahara syndrome
ARX
Early infantile epileptic encephalopathy
<3mo
EEG - burst suppression
West syndrome
Infantile spasm
ARX boys
CDKLS girls
4-8mo, 2/3 have underlying neurology (HIE, PVL, TS)
Idiopathic - developmental delay after onset seizures
Symptomatic - developmental delay before onset seizures
Flexor spasms head trunk limbs, extension of arms
1-2 sec, 20-30 bursts
Reduced social interaciton
Development slows then regresses
Hypsarrythmia on EEG (completely chaotic)
Rx: prednisolone, vigabatrin**, clonazepam
Myoclonic atonic (drop attacks)
GLUT1/SCN1A Jerk then drop Triggered by photosensitivity Tx: valproate, steroids NOT carbamazepine, phenytoin, vigabatrin
Lennox-Gastaut syndrome
3-5yo Intractable Multiple seizure types (drop attack, tonic, absence) Developmental regression/arrest, behaviour disorder Hx: infantile spasms EEG: slow spike and wave Poor prognosis Tx: valproate, lamotrigine, vigabatrin
Landau-Kleffner syndrome
2-9yo Infrequent seizures (nocturnal) Aphasia/speech disturbance Behavioural disturbance MRI normal Tx: steroids, IVIG, ketogenic diet
Occipital epilepsy
Younger: unresponsive, eye deviation, vomiting
Older: visual disturbance, hallucinations
EEG: occipital discharge suppression by fixation
Resolves no Tx
Temporal lobe epilepsy
Late childhood
Hippocampal sclerosis
Associated with prolonged febrile convulsions
Complex partial, secondarily generalised
Precipiated by sleep deprivation, hormonal changes
Tx: phenytoin, carbamazepine, leviteracitam
Lobectomy if hippocampal sclerosis can cure 90%
Epilepsy treatment
General rules
Focal: carbamazepine
Generalised: valproate (carbamazepine worsens)
Sodium valproate
Generalised tonic clonic
Absence
Myoclonic
Partial
Carbamazepine
Partial
Clonazepam
Infantile spasms second line
Ethosuximide
Absence
Leviteracitam
Second line in GTCS, Janz
Phenytoin
Status epilepticus, temporal lobe epilepsy
Vigabatrin
Infantile spasms, adjunctive therapy for poorly controlled seizures
Partial seizures
Carbamazepine
Benign Rolandic
No treatment, resolves by adolesnce
Absence
Ethosuxamide childhood
Valproate, lamotrigine for late onset
NOT carbamazepine - can bring on GTCS
GTCS
Valproate
Leviteracitam
Carbamazepine, lamotrigine, topiramate, phenytoin, phenobarbitone
Juvenile Myoclonic Epilepsy (Janz)
Valproate
Leviteracitam, lamotrigine (teenage girls)
Avoid carbamazepine, phenytoin - makes GTCS worse
West syndrome (infantile spasm)
Prednisolone
Vigabatrin**
Clonazepam
Myoclonic atonic (drop attacks)
Valproate
Steroids
NOT carbamazepine, phenytoin, vigabatrin (can worse)
Lennox-Gastaut syndrome
Valproate
Lamotriginem Vigabatrin
Landau-Kleffner syndrome
Steroids, IVIG, ketogenic diet
Dravet
Refractory
Ketogenic diet
Temporal lobe epilepsy
Phenytoin, carbamazepine, leviteracitam
Lobectomy
Side effects
In asians check HLAB1502 prior to starting phenytoin/carbamazepine (risk SJS)
Valproate
Na channel blocker
Weight gain Nausea Vomiting Hair loss Pancreaittis Hepatoxicity Teratogenic 5% *inhibitor*
Carbamazepine/oxcarbazepine
Na channel blocker
Rash SJS Neutropaenia Low Na Ataxia Liver enzyme induciton Nausea Vomiting Drowsiness *inducer*
Worsens absence, JME - GTCS
Vigabatrin
Restricted peripheral visual fields
Nigh vision loss
Sedation
Weight gain
Lamotrigine
Hypersensitivity Blurred vision Diplopia Nausea Dizziness Tremour Rash SJS (increased levels with valproate, decreased levels with carbamazepine)
Ethosuxamide
Nausea Vomiting Drowsiness Rash Bone marrow suppression
Topiramate
Drowsiness Withdrawal Weight loss Renal stones Glaucoma
Gabapentin
Insomnia
Ataxia
Excreted unchanged in urine
Levetiracetam
Sedation Dizziness Depression Behavioural disturbance Thrombocytopaenia
Benzodiazepines (clonazepam, diazepam)
Sedation
Tolerance
Increased secretions
Phenytoin
Hirsutism Gum hypertrophy Hepatitis Rash SJS *inducer*