Neurology Flashcards
- sudden onset weakness on ONE side of body
- weakness of half of face
- aphasia
- +/- partial/total loss of vision
stroke, or TIA (transient ischemic attack)
stroke SPARES what part of face?
UPPER THIRD OF FACE
from the eyes up
80% of strokes are
ischemic (d/t thrombosis, or embolism)
20% of strokes are
hemorrhagic
symptoms last
TIA (transient ischemic attack)
transient loss of vision in one eye
amaurosis fugax
TIAs are ALWAYS caused by what? and are NEVER caused by?
- emboli, or thrombosis
- never hemorrhage
best INITIAL test for stroke or TIA
head CT WITHOUT contrast
how many days are needed to achieve > 95% sensitivity in detection of nonhemorrhagic stroke?
3-5 days
achieves 99% sensitivity for nonhemorrhagic stroke w/i 24 hours
MRI
can be positive for nonhemorrhagic stroke w/i 1 hour
MRA
treatment for stroke w/i 3 HOURS of onset of symptoms
thrombolytics
ABSOLUTE CI to thrombolytic therapy in a stroke pt (8)
- h/o hemorrhagic stroke
- intracranial mass
- active bleeding/surgery w/i 6 weeks
- bleeding d/o
- CPR w/i 3 weeks
- suspicion of aortic dissection
- stroke w/i 1 year
- cerebral trauma/brain surgery w/i 6 months
best INITIAL treatment for pts coming too late for thrombolytics, and AFTER use of thrombolytics
aspirin
treatment if pt develops stroke while already on aspirin
- switch to clopidogrel, or
- add dipyridamole to aspirin
should be added to ALL nonhemorrhagic strokes
statin
arterial lesions and symptoms:
- C/L PROFOUND LOWER extremity weakness
- mild upper extremity weakness
- personality changes, or psychiatric disturbance
- urinary incontinence
anterior cerebral artery
arterial lesions and symptoms:
- C/L PROFOUND UPPER extremity weakness
- APHASIA (can’t speak)
- apraxia/neglect (inability to carry out purposeful movements)
- eyes deviate TOWARDS the lesion
- C/L homonymous hemianopsia
middle cerebral artery
arterial lesions and symptoms:
- prosopagnosia (inability to recognize faces)
posterior cerebral artery
arterial lesions and symptoms:
- vertigo
- N/V
- “drop attack,” LOC
- VERTICAL nystagmus
- dysarthria (difficulty pronouncing words), and dystonia
- sensory changes in face and scalp
- ATAXIA
- B/L FINDINGS
vertebrobasilar artery
arterial lesions and symptoms:
- I/L FACE
- C/L body
- VERTIGO
- Horner’s syndrome (doesn’t have to be all 4 signs: miosis, ptosis, anhydrosis, and enophthalmos)
posterior inferior CEREBELLAR artery
arterial lesions and symptoms:
- MUST BE AN ABSENCE OF CORTICAL DEFICITS
- ataxia
- Parkinsonian signs
- sensory deficits
- hemiparesis (most notable in face)
- possible bulbar signs (impairment of CNs 9, 10, 11, 12)
lacunar infarct
arterial lesions and symptoms:
- amaurosis fugax
ophthalmic artery
after initial treatment of stroke/TIA, most important issue is to?
determine origin of stroke
the following are indicated in ALL pts with stroke/TIA
- echocardiogram
- carotid dopplers/duplex
- EKG/Holter monitor
the following are indicated in young pts (
- ESR
- VDRL, or RPR
- ANA
- ds-DNA Ab
- protein C
- protein S
- factor V Leiden mutation
- antiphospholipid syndrome
the younger the pt, the more likely the cause of stroke is from
vasculitis, or hypercoagulable state
treatment for status epilepticus
benzodiazepine
treatment for status epilepticus if seizure PERSISTS after use of benzodiazepine
add fosphenytoin
treatment for status epilepticus if seizure PERSISTS after use of benzodiazepine, and fosphenytoin
add phenobarbital
treatment for status epilepticus if seizure PERSISTS after use of benzodiazepine, fosphenytoin, and phenobarbital
general anesthesia (pentobarbital, thiopental, midazolam, propofol)
the following tests should be ordered on a pt having a seizure
- sodium, calcium, magnesium, glucose, O2
- stat head CT (MRI if CT is negative)
- urine toxicology screening
- liver and renal function
if INITIAL tests do not reveal etiology of seizure, next step in mangement
EEG (electroencephalogram)
generally, should you treat with chronic antiepileptic drug therapy after a SINGLE seizure?
NO
treat seizures chronically under the following circumstances:
- strong family history
- abnormal EEG
- status epilepticus requiring a benzodiazepine
- non-correctable precipitating cause (brain tumor)
first-line treatments for long-term management of seizures
- valproic acid
- carbamazepine
- phenytoin
- levetiracetam
- lamotrigine
(all equal in efficacy)
adverse effect of lamotrigine
- Stevens-Johnson syndrome
second-line treatments for long-term management of seizures
- gabapentin
- phenobarbital
best treatment for absence seizures (petit mal)
ethosuximide
- tremulous pt w/ slow, abnormal “festinating” gait
- predominantly a gait d/o
- orthostasis
Parkinson’s disease
PE findings of Parkinson’s disease
- cogwheel rigidity
- resting tremor
- hypomimia (masklike/underreactive face)
- micrographia
- orthostasis
- INTACT cognition and memory
diagnostic test for Parkinson’s disease
NONE, clinical diagnosis
treatment for Parkinson’s disease:
- mild symptoms
- under age 60
anticholinergic agent (benztropine, hydroxyzine)
treatment for Parkinson’s disease:
- mild symptoms
- over age 60
amantadine
treatment for Parkinson’s disease:
- severe symptoms
- levodopa/carbidopa
- COMT inhibitors (tolCAPONE, entaCAPONE)
- MAO inhibitors (seleGILINE, rasaGILINE)
definition of severe symptoms in Parkinson’s disease
inability to perform ADL
resting tremor
- diagnosis
- treatment
- Parkinson’s disease
- amantadine
intention tremor
- diagnosis
- treatment
- cerebellar d/o
- treat etiology
resting AND intention tremor
- diagnosis
- treatment
- essential tremor
- propranolol
- abnormalities of ANY part of CNS
- optic neuritis
- MOTOR and SENSORY problems
- bladder defect
- fatigue
- hyperreflexia
- spasticity
- depression
multiple sclerosis
MC abnormality of multiple sclerosis
optic neuritis
best INITIAL test for multiple sclerosis
MRI
MOST ACCURATE test for multiple sclerosis
MRI
when is CSF tap indicated in multiple sclerosis?
if MRI is nondiagnostic
check for presence of oligoclonal bands
best INITIAL treatment for acute exacerbation of multiple sclerosis
steroids
disease-modifying treatment for multiple sclerosis
- beta interferon
- glatiramer
- mitoxantrone
- natalizumab
- fingolimod
- dalfampridine
adverse effect of natalizumab
PML
treatment for fatigue in multiple sclerosis
amantadine
treatment for spasticity in multiple sclerosis
- baclofen
- tizanidine
- slowly progressive loss of memory EXCLUSIVELY in older pts (> 65 yoa)
- NO focal deficits
- diagnosis of exclusion
Alzheimer’s disease
for ALL pts w/ memory loss, you must order the following:
- head CT
- B12 level
- TSH/T4
- VDRL, or RPR
only abnormal test in Alzheimer’s disease will be
head CT showing DIFFUSE, SYMMETRICAL ATROPHY
standard of care treatment for Alzheimer’s disease
anticholinesterase inhibitors
- donepezil
- rivastigmine
- galantamine
- PERSONALITY and BEHAVIOR become abnormal FIRST
- memory loss afterwards
frontotemporal dementia (Pick’s disease)
head CT, or MRI shows what in frontotemporal dementia (Pick’s disease)?
FOCAL atrophy of FRONTAL and TEMPORAL lobes
treatment for frontotemporal dementia (Pick’s disease)
same as Alzheimer’s disease:
anticholinesterase inhibitors
- donepezil
- rivastigmine
- galantamine
- caused by prions
- RAPIDLY progressive dementia
- MYOCLONUS
Creutzfeldt-Jakob disease (CJD)
MOST ACCURATE test for Creutzfeldt-Jakob disease (CJD)
brain biopsy
CSF shows what in Creutzfeldt-Jakob disease (CJD)?
14-3-3 protein
if found, spares pt from needing brain biopsy
- Parkinson’s disease PLUS dementia
- very vivid, detailed hallucinations
lewy body dementia
- wet: urinary incontinence
- weird: dementia
- wobbly: wide-based gait/ataxia
normal pressure hydrocephalus (NPH)
diagnostic tests for normal pressure hydrocephalus (NPH)
- head CT
- lumbar puncture showing NORMAL pressure
treatment for normal pressure hydrocephalus (NPH)
shunt placement
- young pt (30’s)
- family history
- dementia
- psychiatric disturbance w/ personality changes
- chorea/movement d/o
huntington’s disease/chorea
diagnosis for huntington’s disease/chorea
genetic testing
autosomal dominant
treatment for movement d/o in huntington’s disease/chorea
tetrabenazine
symptomatic control of huntington’s disease/chorea
antipsychotics
what percentage of migraine headaches are unilateral vs bilateral?
- 60% U/L
- 40% B/L
triggers for migraines
- cheese
- caffeine
- menstruation
- OCPs
symptoms that may proceed migraine headache
- aura of bright flashing lights
- scotomata
- abnormal smells
when should head CT or MRI be done for migraines?
- sudden and/or severe
- onset of headaches AFTER age 40
- FNDs
best INITIAL (abortive) treatment for migraines
sumatriptan, or ergotamine
prophylactic treatment for migraines (requires several weeks to take effect)
- BB
- CCB
- TCA
- SSRI
when should a pt be placed on prophylactic treatment for migraines?
4 or more headaches per month
- 10x more frequent in men than women
- EXCLUSIVELY unilateral
- redness/tearing of eye
- rhinorrhea
cluster headache
best INITIAL (abortive) treatment for cluster headache
triptans, or 100% oxygen
best INITIAL prophylactic treatment for cluster headache
CCB
- tenderness of temporal area
- jaw claudication
temporal arteritis
diagnostic test for temporal arteritis
ESR
MOST ACCURATE test for temporal arteritis
temporal artery biopsy
most important treatment for temporal arteritis
STEROIDS
a delay may result in permanent vision loss
- obese, young woman w/ headache and double vision
- papilledema
- normal CT/MRI
- +/- vitamin A use
- 6th CN palsy
- pulsatile tinnitus
pseudotumor cerebri
MOST ACCURATE test for pseudotumor cerebri
LP w/ OPENING PRESSURE MEASUREMENT (markedly elevated)
treatment for pseudotumor cerebri
- weight loss
- acetazolamide
- surgery if those fail
- room spinning
- N/V
- HORIZONTAL nystagmus
vertigo
ALL pts w/ vertigo should have what?
MRI of internal auditory canal
causes of vertigo:
- changes w/ position
- NO hearing loss
benign positional vertigo (BPPV)
causes of vertigo:
- does NOT change w/ position
- NO hearing loss
vestibular neuritis
causes of vertigo:
- acute
- hearing loss
labyrinthitis
causes of vertigo:
- chronic
- hearing loss
Meniere’s disease
causes of vertigo:
- ATAXIA
- hearing loss
acoustic neuroma
causes of vertigo:
- h/o trauma
- hearing loss
perilymph fistula
PE finding in BPPV
Dix-Hallpike maneuver
treatment for BPPV
meclizine
treatment for vestibular neuritis
meclizine
treatment for labyrinthitis
meclizine and steroids
treatment for Meniere’s disease
salt restriction and diuretics
diagnosis for acoustic neuroma (8th CN tumor related to neurofibromatosis)
MRI of internal auditory canal
treatment for acoustic neuroma (8th CN tumor related to neurofibromatosis)
surgical resection
- h/o chronic heavy alcohol abuse
- confusion w/ confabulation
- ataxia
- memory loss
- gaze palsy/ophthalmoplegia
- nystagmus
Wernicke-Korsakoff syndrome
diagnostic tests for Wernicke-Korsakoff syndrome
- head CT
- B12 level
- TSH/T4
- VDRL, or RPR
treatment for Wernicke-Korsakoff syndrome
THIAMINE FIRST, then glucose
if a CNS infection is suspected, when should you do a head CT before doing an LP?
- h/o CNS disease
- FND
- PAPILLEDEMA
- seizures
- altered consciousness
- significant delay in ability to perform LP
if CNS infection is suspected, next steps in management
- LP
- blood cultures
- empiric antibiotics
does a negative blood culture exclude meningitis?
NO, only 50-60% sensitive
gram + diplococci
Pneumococcus
gram - diplococci
Neisseria
gram - pleomorphic, coccobacillary organisms
Haemophilus
gram + bacilli
Listeria
CSF glucose below 60 is consistent w/
bacterial meningitis
best INITIAL test for meningitis
CSF cell count
if thousands of neutrophils are present in CSF, next step in management
start IV ceftriaxone, vancomycin, and steroids
MOST IMPORTANT criterion to determine need to treat pt w/ suspected meningitis
CSF cell count
thousands of neutrophils is meningitis until proven otherwise
- HIV-positive pt w/ CD4 count
Cryptococcus
best INITIAL test for Cryptococcal meningitis
India ink
MOST ACCURATE test for Cryptococcal meningitis
Cryptococcal Ag
best INITIAL treatment for Cryptococcal meningitis
amphotericin and 5-flucytosine (5FC), followed by fluconazole PO until CD4 count is > 100
- recent camping/hiking trip
- tick exposure only remembered by 20% of pts
- joint pain
- 7th CN palsy
- rash w/ central clearing (target lesion)
lyme disease
MOST ACCURATE tests for CNS lyme disease
serology and Western blot of CSF
treatment for CNS lyme disease
IV ceftriaxone, or IV PCN
- camper/hiker
- rash that STARTS on WRISTS and ANKLES, and moves centripetally toward center
- fever, headache, and malaise PRECEDE rash
- only 60% will remember tick bite
rocky mountain spotted fever
- extremely difficult diagnosis
- look for immigrant w/ h/o lung TB
- presentation is very slow over weeks to months
- if case describes fever, headache, and neck stiffness over HOURS then it is not TB
TB meningitis
CSF protein level in TB meningitis
very high
acid fast stain is positive in what percentage of TB meningitis?
10%
treatment for TB meningitis
rifampin, isoniazid, pyrazinamide, ethambutol, and steroids
- diagnosis of exclusion
- lymphocytic pleocytosis (elevated WBCs)
viral meningitis
treatment for viral meningitis
no specific treatment
treatment for Listeria monocytogenes meningitis
IV ampicillin
- elderly pt
- neonatal pt
- HIV-positive pt
- asplenic pt
- immunocompromised w/ leukemia/lymphoma
- elevated neutrophils in CSF
Listeria monocytogenes meningitis
- adolescent pt
- pt in the military
- asplenic pt
- pt w/ TERMINAL COMPLEMENT DEFICIENCY
Neisseria meningitidis
treatment for Neisseria meningitidis meningitis
- respiratory isolation
- IV ceftriaxone
isolation type for Neisseria meningitidis meningitis
droplet precautions
Neisseria meningitidis meningitis: prophylactic treatment for close contacts
rifampin, ciprofloxacin, or ceftriaxone
fever + confusion over a few hours =
encephalitis
best INITIAL test for encephalitis
head CT scan
MOST ACCURATE test for encephalitis
PCR of CSF
best INITIAL treatment for encephalitis
acyclovir (MCC of encephalitis in USA is HSV)
treatment for acyclovir-resistant pts for encephalitis
foscarnet
- fever, headache, FND
- “ring,” or contrast-enhancing lesion
brain abscess
next step in management of brain abscess is based on?
HIV status
if HIV-negative, next step in management of brain abscess
brain biopsy
if HIV-positive, next step in management of brain abscess
treat for toxoplasmosis w/ pyrimethamine/sulfadiazine x 2 weeks and repeat head CT
- NON-enhancing brain lesions in HIV-positive pt
- no mass effect
progressive multifocal leukoencephalopathy (PML)
treatment for progressive multifocal leukoencephalopathy (PML)
raise CD4 count w/ ART
- Mexican pt w/ seizure
- multiple 1cm CYSTIC lesions (calcify over time)
neurocysticercosis
diagnosis for neurocysticercosis
serology
treatment for neurocysticercosis if still active and uncalcified
albendazole and steroids
treatment for neurocysticercosis if there’s only calcifications
antiepileptics only
head trauma and intracranial hemorrhage:
focal deficits: never
head CT: normal
concussion
head trauma and intracranial hemorrhage:
focal deficits: rarely
head CT: ecchymosis
contusion
head trauma and intracranial hemorrhage:
focal deficits: +/-
head CT: crescent-shaped collection
subdural hemorrhage
head trauma and intracranial hemorrhage:
focal deficits: +/-
head CT: lens-shaped collection
epidural hemorrhage
best initial test for head trauma and LOC
head CT scan
treatment for concussion
none
treatment for contusion
admit for observation
treatment for subdural and epidural hemorrhage
- leave small ones alone
- drain large ones
treatment for large intracranial hemorrhage w/ mass effect
- intubation/hyperventilation to decrease ICP (decrease pCO2 to 28-32 to constrict cerebral blood vessels)
- mannitol to decrease ICP
- surgical evacuation
which pts should receive stress ulcer prophylaxis
- head trauma
- burns
- endotracheal intubation w/ mechanical ventilation
- sudden, severe headache
- stiff neck
- photophobia
- LOC (in 50% of pts)
- FND (in 30% of pts)
subarachnoid hemorrhage (SAH)
best INITIAL test for subarachnoid hemorrhage (SAH)
head CT w/o contrast
MOST ACCURATE test for subarachnoid hemorrhage (SAH)
lumbar puncture
normal WBC to RBC ratio in CSF
1:500
treatment for subarachnoid hemorrhage (SAH)
- angiography to locate site of bleeding
- embolize site of bleeding (superior to surgical clipping)
treatment for subarachnoid hemorrhage (SAH) if hydrocephalus develops
ventriculoperitoneal shunt (VP shunt)
treatment to prevent stroke in subarachnoid hemorrhage (SAH)
nimodipine (CCB)
50% chance of what if pt rebleeds in SAH?
pt will die
spine d/o’s:
nontender
lumbosacral strain
spine d/o’s:
tender
cord compression
spine d/o’s:
tender and fever
epidural abscess
spine d/o’s:
pain on walking downhill
spinal stenosis
- defective fluid cavity in center of spinal cord caused by trauma, tumor, or congenital defect
- loss of sensation of pain and temperature in UE’s B/L in cape-like distribution over neck, shoulders, and down both arms
syringomyelia
diagnosis of syringomyelia
MRI
treatment for syringomyelia
surgery
diagnosis of cord compression
MRI
MOST ACCURATE test for cord compression if diagnosis is unclear from history
biopsy
MOST URGENT step in cases of cord compression
steroids to reduce swelling
diagnosis of spinal epidural abscess
MRI
treatment for spinal epidural abscess
treat against Staphylococcus
- oxacillin
- nafcillin
treatment for spinal epidural abscess w/ large accumulations
surgical decompression
diagnosis of spinal stenosis
MRI
treatment for spinal stenosis
surgical decompression
- ALL SENSATION is lost except position and vibratory sense
anterior spinal artery infarction
treatment for anterior spinal artery infarction
no specific treatment
- traumatic injury to spine (e.g. knife wound)
- loss of I/L position and vibratory sense
- loss of C/L pain and temperature
Brown-Sequard syndrome
idiopathic d/o of BOTH upper and lower motor neurons
- upper motor neuron signs: = hyperreflexia = + Babinski = spasticity = weakness
- lower motor neuron signs:
= wasting
= fasciculations
= weakness
amyotrophic lateral sclerosis (ALS)
treatment for amyotrophic lateral sclerosis (ALS)
riluzole (blocks glutamate accumulation)
MCC of peripheral neuropathy
DM
treatment for peripheral neuropathy
gabapentin, or pregabalin
- pain and weakness of 1st 3 digits of hand
- symptoms worsen w/ repetitive use
carpal tunnel syndrome
treatment for carpal tunnel syndrome
- splint
- steroids
- results from falling asleep w/ pressure on arms underneath body, or
- outstretched arm, draped over back of chair
- WRIST DROP
radial nerve palsy
- results from high boot pressing on back of knee
- FOOT DROP, and inability to Evert foot
peroneal nerve palsy
- hemifacial paralysis of BOTH UPPER and lower halves of face
- loss of taste on ANTERIOR 2/3 of tongue
- hyperacusis
- inability to close eye at night
7th cranial nerve palsy (Bell’s palsy)
treatment for 7th cranial nerve palsy (Bell’s palsy)
steroids
- occurs in pt w/ previous injury to extremity
- light touch results in extreme pain (“burning”)
reflex sympathetic dystrophy
treatment for reflex sympathetic dystrophy
- NSAIDs
- gabapentin
- nerve block
- bed partner c/o pain and bruises in legs
- pt experiences uncomfortable feeling in legs relieved by movement
- associated w/ iron deficiency
restless leg syndrome (RLS)
treatment for restless leg syndrome (RLS)
pramipexole, or ropinirole
- ASCENDING weakness
- LOSS OF DTRs
- URI 2-4 weeks may precede
- paresthesia is common, but true sensory deficits are rare
Guillain-Barre syndrome
MOST URGENT step in Guillain-Barre syndrome
peak inspiratory pressure
most important factor in determining need for therapy w/ either IVIG, or plasmapheresis
peak inspiratory pressure
- weakness in muscles of mastication
- blurry vision d/t diplopia
- drooping of eyelids as day progresses
myasthenia gravis
best INITIAL test for myasthenia gravis
anti-acetylcholine receptor Abs (ACHR Abs)
MOST ACCURATE test for myasthenia gravis
clinical presentation AND ACHR Abs
best INITIAL treatment for myasthenia gravis
pyridostigmine, or neostigmine
treatment for myasthenia gravis in pts
thymectomy
treatment for myasthenia gravis if thymectomy does NOT work, or no response to pyridostigmine, or neostigmine
steroids
treatment for myasthenia gravis to keep pts off of long-term steroids
azathioprine, or cyclosporine