Neuro 2.2 Flashcards
How does TIAs look on imaging?
They don’t, fool.
How often do you do the ABCD score?
2, 7, and 90 days after CVA
What do you get points for in the ABCD score?
Age > 60 years (1 point)
BP = 140/90 mmHg at initial evaluation (1 point)
Speech disturbance without weakness (1 point) OR
Unilateral weakness (2 point)
Duration of symptoms of 10-59 minutes (1 point) OR
Duration of symptoms >60 minutes (2 point)
DM mellitus in patient’s history (1 point)
ABCD score where hospital observation is unnecessary
0-3
ABCD score where hospital observation is justified
4-5
ABCD score where hospitalization is worthwhile
6-7
If a TIA is probable, what do you do?
Apply ABCD score, aspirin, refer to TIA clinic
What does ABCD stand for?
age; blood pressure; clinical features of TIA; duration; diabetes
Treatment for patient with TIA and a. fib
anticoagulants
Treatment for patients with TIA and mural thrombus
anticoagulants
All patients with TIA treatment:
ASA
ASA + dipyridamole
Clopidogrel
ASA + clopidogrel
Are anticoagulant drugs recommended in the average patient with a TIA?
No
When do you start OAC in patient with TIA and a.fib?
1 day after acute event
When do you start OAC in patient with mild stroke and a.fib?
3 days after acute event
When do you start OAC in patient with moderate and a.fib?
6 days after acute event
When do you start OAC in patient with severe and a.fib?
16 days after acute event
Mild stroke NIHSS
<8
Moderate stroke NIHSS
8-15
Severe stroke NIHSS
> 16
Recurrent TIAs with identical clinical features are usually caused by
thrombosis or embolism arising from the same site within the cerebral circulation
TIAs that differ in character from event to even suggest ?
recurrent emboli from distant or multiple sites
What’s the most common cause of embolic stroke?
a. fib
Name five causes of embolic stroke?
a. fib; migraine; arterial dissection; temporal arteritis; sickle cell anemia
Name the 5 classic lacunar syndromes
pure motor stroke; pure sensory stroke; ataxic hemiparesis; clumsy hand-dysarthria; sensory-motor
Most common classic lacunar syndrome?
pure motor
Pure motor stroke
hemiparesis affecting the face, arm, and leg to a roughly equal extent, without associated disturbance of sensation, vision, or language- usually located in the contralateral internal capsule or pons
Pure sensory stroke
hemisensory loss, which may be associated with paresthesia, and results from lacunar infarction in the contralateral thalamus
Ataxic hemiparesis
pure motor hemiparesis is combined with ataxia of the hemiparetic side and usually affects the leg predominantly- results from a lesion in the contralateral pons, internal capsule, or subcortical white matter.
Clumsy hand-dysarthria
dysarthria, facial weakness, dysphagia, and mild weakness and clumsiness of the hand on the side of facial involvement
Lacunar strokes occur from?
occlusion of small penetrating arteries
The occlusion of what circulation leads to locked-in syndrome?
basilar artery, vertebral artery
What is vertebrobasilar insufficiency?
poor blood flow to brainstem
Symptoms of vertebrobasilar insufficiency
vertiigo with associated neurologic signs; diplopia; ataxia; dysarthria; weakness/paralysis/numbness; drop attacks; HA
What do you need to rule out in any dizziness work up?
vertebrobasilar insufficiency
Goal standard for vertebrobasilar insufficiency?
Digital subtraction cerebral angiography (DSA)
Two main types of hemorrhagic stroke?
ICH and SAH, both of which can lead to IVH
75% of hemorrhagic strokes are due to?
ICH
Largest risk factor for intracerebral hemorrhage?
HTN
Causes of secondary intracerebral hemorrhage?
trauma, arteriovenous malformation, intracranial aneurysm, intracranial neoplasm, cocaine drug exposure
Define intracerebral stroke:
acute spontaneous bleeding into brain parenchyma
Primary ICH:
results from microscopic small-artery degeneration in the brain, caused by either chronic poorly controlled HTN or amyloid angiopathy
Secondary ICH:
intraparenchymal bleeding from a diagnosable anatomic vascular lesion or coagulopathy
ICH: Plasma that is rich in thrombin and other clotting factors then seeps into the surrounding brain tissue, where it triggers a cascade of secondary brain injury that evolves during days to weeks. This unique form of x causes local brain edema, programmed neuronal and glial apoptotic cell death, and breakdown of the brain-blood barrier
neurohemoinflammation
The most commonly affected structures in ICH are:
basal ganglia and thalamus; lobar regions; brain stem and cerebellum
Cerebral amyloid angiography
non-hypertensive lobar intracerebral hemorrhage in the elderly, is characterized by the deposition of B-amyloid protein in small to medium-sized blood vessels of the brain and leptomeninges
Cerebral amyloid angiography CM
dementia, gait disturbance, complex partial seizures
CM of ICH:
Severe HA, vomiting, BP elevated
Which is more severe ICH or ischemic CVA?
neurologic deficit is frequently more severe in ICH
On an non contrast CT, an acute ICH is?
hyperdense
On an non contrast CT, a subacute ICH is?
isodense
On an non contrast CT, a chronic ICH is?
hypodense
Does an ICH get a hospital stay?
ICU or stroke unit for at least first 24 hours due to high risk of neurologic deterioration
BP goal of ICH?
140 mm HG systolic and MAP of <140 mmHg
In ICH, maintain MAP of <140 mmHg by continuous infusion of?
labetalol or nicardipine
In ICH, for elevated INR reverse with?
Vitamin K and 4F-PCC
In ICH, for heparin reversal?
protamine sulfate
In ICH, for thrombocytopenia or platelet dysfunction?
desmopressin and/or transfuse platelets
Expedited INR reversal for life-saving neurosurgical intervention?
recombinant activated factor VIIa
How to alleviate intracranial pressure?
elevate head of bed to 30 degrees; Mannitol; hyperventilate
Seizure prophylaxis in ICH?
fosphenytoin or phenytoin
When is external ventricular drainage indicated in ICH?
in all stuporous or comatose patients with intraventricular hemorrhage and ventricular enlargement in whom aggressive support is indicated
In ICH, ICP should be below?
20 mmHg
Indications for decompressive posterior fossa surgery in ICH
neurologic deterioration, brainstem compression, and hydrocephalus (cerebellar hemorrhage)
Indications for surgical evacuation for lobar hematomas?
larger than 30 mL and located approximately 1 cm from brain’s surface
Subarachnoid:
caused by rupture of vessels on the brain’s surface, most often due to a congenital aneurysm, and result in diffusion of blood throughout the CSF spaces
Men or Women: subarachnoid?
women
Most common cause of SAH?
trauma
Most common spontaneous cause of SAH?
rupture aneurysms
The thunderclap headache is associated with?
SAH
If you suspect a SAH and it doesn’t show up on a non-contrast CT, what do you do?
lumbar puncture
What will the CSF look like in a SAH LP?
grossly bloody, xanthochromic (yellow-tinged) fluid (present after 12 hours)
Definitive diagnostic procedure to detect intracranial aneurysms and to define their anatomy
angiography
SAH BP goal?
<160 systolic
BP treatment for SAH?
labetalol or nicardipine
Re-bleeding prophylaxis in SAH?
e-aminocaproic acid
Seizure prophylaxis in SAH?
fosphenytoin or phenytoin
vasospasm prophylaxis in SAH?
nimodipine
Cerebral edema treatment in SAH?
mannitol or hypertonic saline
ICP goal in SAH?
<20 mm Hg
How to diagnosis vasospasm in SAH?
transcranial doppler every 1-2 days until the tenth day after SAH; CT angiography and perfusion on day 4-8 after SAH or for neuro worsening
therapy for symptomatic vasospasm in SAH?
place patient in trendelenburg; normal saline; if deficit persists, then raise systolic BP with phenylephrine or norepinephrine
If refractory symptomatic vasospasm in SAH, treatment?
add dobutamine or milrinone
Definitive treatment for the prevention of re-bleeding in SAH?
complete obliteration of a rupture saccular aneurysm by either endovascular coiling or surgical clipping
Procedure that involves packing the rupture aneurysm with platinum coils?
endovascular coil embolization
Endovascular coil embolization is good for aneurysms
<10 mm in diameter
Surgical clipping requires a craniotomy is preferred for?
wide-necked aneurysms
What tool is used to classify SAH?
Hunt-Hess Grading Scale