Stroke Flashcards
What proportion of patients diagnosed with a ischemic stroke will statistically be alive in 5 years?
Approximately 50%
What proportion of patients diagnosed with a TIA will go on to:
a) have a ischemic infarct within 3 months,
b) have another TIA,
c) have passed away, had an ischemic infarct or another TIA?
a) Approx 15%
b) Approx 9%
c) Approx 25%
What is the most commonly used scale to rank disability from stroke?
Which categories are considered a good outcome from stroke? (0-6 scale).
Total Anterior cerebral strokes include which main vessel?
Middle cerebral a.
Embolic causes consitute approx 80% of all Total anterior cerebral strokes (TACS) and Partial anterior cerebral stroks (PACS) what are the two most common causes of the emboli?
- Carotid stenosis / atherosclerosis.
- Cardiac causes…. most commonly atrial fibrilation
What is a tell tale sign of a posterior cerbral arterial stroke?
Mixed side involvement ie. CN involvement of the Left and motor / sensory deficit on the other side or other mixed side combinations ie cerebella dysfunction on one side without controlateral accompanying sensory / motor deficit (remember cerebella input is ipsilateral).
What scale is more commonly used for measuring stroke nowdays? What consitutes a moderate stroke?
NIH Stroke Scale - a score 11 or above is considered a moderate stroke
How do you divide stroke presentations into acute treatment groups were:
Group 1 may receive tPA +/- endovascular clot retrieval and
Group 2 receives only 300mg of Asprin.
Large vessel anterior strokes would be assessed for appropriateness for Group 1 acute treatment options.
Small vessel / posterior strokes would be provided with Group 2 treatment.
Is a loss of consciousness (ALOC) common in stroke & TIA?
No - a significant occlusion is required to cause ALOC therefore a patient reporting ‘funny turn’ including ALOC is not a TIA.
What are the TIA Commandments / what constitutes a TIA?
See image
It is important to be able to localise / determine which vessel is implicated in stroke, why?
(2 reasons)
Large v small vessel - effects treatment (rapid intervention + secondary prevention vs only secondary prevention).
It is also important because if a vascular territory cannot be determined and deficits are more generalised / over many vascular territories then diagnositic mimics are more likely.
What are Lucuna Strokes?
Small vessel strokes located deep within the cerebral hemispheres.
Signs of Lucuna strokes include at least 2/3 of:
1. Face, arm or leg without cortical or brainstem signs
2. RV in literature lecture provided minimal information
What is Capsular Warning Syndrome?
Pronator drift is a sign of Upper or Lower motor neuron damage?
Upper motor neuron damage causes pronator drift of the UL and extension of the LL - which over time sits in spastic contraction. Think evolution - paralyised arm gets tucked up across the chest & leg extends so it can still be walked on.
How do you differentiate between central and peripheral vertigo? in an acute presentation and non-fluctuating and non-positional.
HINTS
1. Head impulse test (assesses occulomotor reflex) - over correction observed when patient is asked to keep focus on your nose and then you rapidly move their head to one side. The overcorrection is observed when the head is moved to the side of the lesion.
*Negative test - central nastagmus. Positive test - peripheral nastagmus.
- Nastagmus
*Nastagmus with changing directions (central vertigo).
Peripheral nastagmus has fast beating (thats the side it is named after L / R) that continues to only have its fast beating face for either the L or Right only. - Skew deviation (vertical realignment of the eyes when one is covered and the other is fixated on an object when you uncover the covered eye to test the other eye you notice the covered eye realign vertically with the tested eye - central vertigo / central lesion).
*Positive test - central vertigo.
*Negative test - periperal vertigo.