Stroke Flashcards
What makes you able to still try to perfuse to the brain if something is blocked
Circle of Willis
Circulation is all connected
What does stroke deal with
Perfusion
How much of cardiac output is needed to go to the brain for optimal functioning
20%
What happens if there is increased blood flow, swelling, etc and it squeezes out at brainstem
Often results in death
What is a major cause of strokes
Atherosclerosis
Hardening and thickening of arteries
If an artery is described as having laminar flow, we know that is
Good, no blockages or swelling of arteries
Turbulent flow is bad
Where is a major spot for clots
Middle cerebral artery (branches off near circle of Lewis)
Cerebrovascular disease ranks ____ as a cause of death in USA and ____ cause of permanent disability in the USA
3rd
1st
Definition of stroke
Brain injury caused by sudden disruption of blood flow to the brain
Modifiable risk factors for stroke
Smoking Diabetic Hyperlipidemia Hypertension Heart disease Obesity
Non modifiable risk factors for strokes
Age (doubles for every decade over 65)
Race (African Americans > whites)
Possibly heredity
Time lost =
Brain lost
What does F A S T stand for in trying to detect a stroke
F- face (symmetric)
A- arm (strength and movement)
S- speech (patterns and understanding)
T- time (= brain; call squad, do not drive)
TIA (transient ischemic attack) is a mini or silent stroke. What is it caused by
Temporary interruption in blood supply to the brain
Amaurosis is
Temporary blindness of one eye (related to a stroke)
How quickly will one recover from a TIA
24 hours
Approximately ____ of all strokes are preceded by a TIA
1/3
What are the two types of strokes
Ischemic (most common)
Hemorrhage (spontaneous bleeding in brain)
What are the two types of ischemic strokes
Thrombotic
Embolic ( always starts from heart)
Why is someone with a fib. At risk for a stroke
Your heart beats so fast and doesn’t pump out much of the blood. It forms a pool in your atrium and clots form. If a clot then gets pumped out it could cause an Embolic stroke
What should you know about a CAT scan with a stroke pt
Should be done within 30 minutes of arriving
Do not use contrast
Thrombotic stroke
Blood clot forms in artery of brain and obstructs blood flow
Symptoms progress in first 72 hours as damage increases