Health Science 2211-Lecture 6 (2)
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is the rapidly developing loss of brain function due to interruption of the cerebral blood supply and necrosis of neurons in part of the brain
what are the 2 types of stroke, briefly describe each.
- ischemic stroke: caused by interruption of the cerebral blood supply without bleeding (85% most common)
- hemorrhagic strokes: involve rupture of a cerebral blood vessel and leakage of blood into the brain (15% less common)
How does oxygenated blood travel to the brain?
- oxygenated blood from the left heart travels upward through the carotid and vertebral arteries arising aortic arch
- blood is further distributed to the brain through complex network or cerebral arteries, arterioles and capillaries
what are the 4 clinical subtypes if ischemic stroke?
- typical severe stroke: most often due to advanced atherosclerotic lesions in cerebral arteries and/or longstanding high blood pressure
- transient ischemic attack (TIA): resolves completely within 24 hrs
- completed stroke: persists longer than 24 hrs
- fatal stroke: is completed stroke followed by death within 28 days
what are the warning signs of stroke? (6)
- sudden weakness of face, arm or leg (face drooping)
- sudden numbness of face, arm or leg
- trouble speaking/slurred speech
- trouble seeing
- trouble walking
- severe headache
what are the 3 was to diagnose stroke with imaging tests?
- MRI or CT scan: of brain tissue
- ultrasound: performed on carotid arteries in neck
- Cerebral angiogram: use special dyes and x-rays to view blood vessels supplying the brain
Neurological symptoms depend on ________ and _____________.
what are the clinical consequences of ischemic stroke when the right brain is affected? (4)
- paralysis of left side of body
- vision problems
- quick, inquisitive behavioural style
- memory loss
what are the clinical consequences of ischemic stroke when the left brain is affected? (4)
- paralysis of the right side of body
- speech/language problems
- slow, cautious behavioural style
- memory loss
what are the top 2 causes of mortality worldwide?
- 1.cornory heart disease
- 2.cerebral infraction (stroke)
Stroke can cause both _______ and _________ thus creating a dual health burden.
death and disability
primary prevention is the reason of decline in stroke in developed nations. what are some examples? (2)
- avoid smoking
- maintaining blood pressure, cholesterol and blood glucose within normal limits
secondary prevention is also the reason of decline in stroke in developed nations. what are some examples
- treatment of hypertension, hyperglycemia, hyperlipidemia
- use of anti-platelet therapy ex. low dose aspirin
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