Flashcards in Chapter 25: Ischemic vs. Hemorrhagic Stroke Deck (18):
What two types of stroke are ischemic?
1) Cerebral thrombosis
2) Cerebral embolus
What is the cause of most strokes?
Stroke caused by a brain cerebral artery narrowed by arteriosclerosis/atherosclerosis; fatty deposits and platelets collect, plaque forms and may ulcerate, causing a clot to form that blocks the vessel.
True or false: The same factors that cause atherosclerosis of coronary arteries that can lead to a heart attack can cause blockages of cerebral arteries, leading to stroke.
True or false: Cerebral embolus is more common than cerebral thrombosis.
Type of stroke cause by blockage of a cerebral artery by a blood clot originating elsewhere.
Where do the emboli that form a cerebral embolus often originate from?
1) Ulcerated arteriosclerotic plaque, often in the carotid artery.
2) A blood clot formed in the heart (especially because of A-fib)
What heart condition puts one at risk for cerebral embolus?
How can atherosclerosis in the carotid artery lead to a cerebral embolus?
1) Atherosclerotic plaque narrows the lumen surface and often ulcerates.
2) Thrombus forms on ulcerated surface.
3) Thrombus dislodges and embolus is carried to the brain (in rare cases, carotid artery itself can be fully occluded by the thrombus).
In which chamber of the heart will an cerebral embolus originate that is caused by A-fib?
In which chamber of the heart will a cerebral thrombus originate that is caused by an MI?
wall of left ventricle
In what three places in the heart might a cerebral embolus originate?
1) Left atrium (A-fib)
2) Left ventricle (MI)
3) The roughened surface of a diseased mitral or aortic valve
What is the ultimate result of a blockage in a cerebral artery by a thrombus or embolus?
True or false: A hemorrhagic infarct is the same as a cerebral hemorrhage.
Type of ischemic infarct where a little blood leaks into the damaged brain
tissue from locally damaged vessels.
The most serious type of stroke
What causes a cerebral hemorrhage?
Rupture of a cerebral artery in a person with hypertension, causing bleeding inside the brain or in spaces adjacent to it.