Neurologic Emergencies Flashcards
ipsilateral weakness and loss of fine touch/vibration sensation
contralateral loss of pain and temp. below the lesion
Brown-sequard syndrome (hemisection)
bilateral loss of pain and temperature and weakness but with preservation of fine touch, proprioception and vibration
anterior cord syndrome
bilateral loss of pain and temp in upper extremities as well as weakness but with preservation of fine touch
central cord syndrome
best imaging test for visualizing spinal cord
MRI
below what age should all children have imaging done with suspect spinal cord injury
below age 9
what clinical findings are suggestive of spinal shock?
- loss of autonomic function (hypotension with paradoxical bradycardia if vagal output is intact)
- complete absence of DTRs, superficial cutaneous reflexes and rectal tone
principal indications for early surgery in traumatic spinal cord injury
- significant compromise of spinal canal
- fixation of very unstable spine
18 yo athlete with a sports-related trauma where he hit his head experienced transient loss of consciousness right after the event followed some time by a seizure. His neuro exam is relatively non-focal and imaging of his brain is normal but his condition continues to worsen with nausea, headache and vomiting - dx?
intracerebral bleed - most likely epidural hematoma
next diagnostic step if you suspect intracerebral bleed?
non-contrast CT scan of head
findings on CT scan in typical epidural hematoma
- mass that displaces brain from skull
- extra axial
- smoothly marginated
- biconvex (lens) homogenous density
- high density on CT scan
- does not cross suture lines
what do focal isodense or hypodense zones within an EDH imply?
active bleeding
what does air in acute EDH suggest?
fracture of sinuses or mastoid air cells
24 yo women w/o medical illnesses presents with acute alteration in mental status 24 hrs after head trauma with brief LOC. She has attentional deficits, disorganized thinking, altered psychomotor activity, difficulty focusing, memory deficits and disorientation; these symptoms fluctuate. P/E shows generalized hyperreflexia and positive babinski sign bilaterally
delirium from subarachnoid hemorrhage
what metabolic derangements can head trauma cause?
SIADH –> causes hyponatremia with delirium or altered mental status
presentation of acute mental status change, abnormal attention and fluctuating course should make you think of…
delirium
Risk factors for delirium
age ( esp > 80) pre-existing cognitive impairment dehydration electrolyte disturbances men >> women
concussion
traumatic alteration in cognitive function with or without loss of consciousness; aka. mild traumatic brain injury
grade 1 concussion
no LOC and all symptoms resolve w/in 15 min
grade 2 concussion
no LOC but sx last longer than 15 min
grade 3 concussion
LOC for any period of time
New Orleans Criteria
indications for head CT in concussion:
- persistent headache
- emesis
- age > 60 yo or children < 16 yo
- drug or alcohol intoxication
- persistent anterograde amnesia
- soft tissue or bony injury above clavicles
- seizure
observation rules for pt who sustained grade 1 or 2 concussion with normal head CT and neuro exam
observe for 2 hours in ER then discharge home
return to play guidelines for grade 1 concussion
remove from game for atleast 15 minutes, assessed every 5 minutes; if everything ok at 15 min, can return to play
return to play guidelines for grade 2 concussion
removal of game for remainder of day; if neuro exam is normal, athlete can return to play in a week
return to play guidelines for grade 2 concussion
must go to ER for neuroimaging and assessment; can return to play between 1-2 weeks
treatment of brief convulsion at time of head injury
does not require tx. with anticonvulsants and is not assoc. with increased risk of epilepsy
68 yo woman presents with sudden onset of right hemiparesis (in arm and leg) as well as aphasia (word fluency, naming and repetition; she also has right lower facial droop and left gaze deviation - dx?
acute cerebral infarct - Left hemisphere, anterior circulation
Todd’s paralysis
brief period of transient (temporary) paralysis following a seizure
carotid arteries are vascular supply for…
frontal lobes
parietal lobes
most of temporal lobes
basal ganglia
vertebrobasilar blood supply
encompasses brainstem, cerebellum, occipital lobes and thalamus
next step in diagnosis of suspected subarachnoid hemorrhage
non contrast CT scan of head
next step in therapy for suspected subarachnoid hemorrhage
cerebral angiography
risk factors assoc. with aneurysms
- fibromuscular dysplasia
- polycystic kidney disease
- chronic severe HTN with DBP > 110
- liver dz
- tobacco/alcohol use
- vasculitides
- collagen vascular disorders
- infections
- oral contraception
non-aneurysmal causes of subarachnoid hemorrhage
trauma
AV malformation
cocaine/amphetamine abuse