CAUSES OF STROKE
July 17, 2009 by Medical Dude
Filed under Stroke
Ischemic strokes are ultimately caused by a thrombus or embolus that blocks blood flow to the brain. Blood clots (thrombus clots) usually occur in areas of the arteries that have been damaged by atherosclerosis from a buildup of plaques. Embolus type blood clots are often caused by atrial fibrillation – an irregular pattern of heart beat that leads to blood clot formation and poor blood flow.
Hemorrhage strokes can be caused by uncontrolled high blood pressure, a head injury, or aneurysms. High blood pressure is the most common cause of cerebral hemorrhage, as it causes small arteries inside the brain to burst. This deprives brain cells of blood and dangerously increases pressure on the brain.
Aneurysms – abnormal blood-filled pouches that balloon out from weak spots in the wall of an artery – are the most common cause of subarachnoid hemorrhage. If an aneurysm ruptures, blood spills into the space between the surfaces of the brain and skull, and blood vessels in the brain may spasm. Aneurysms are often caused or made worse by high blood pressure.
A Study found that a Single Gene Defect Can Lead To Stroke And Deadly Diseases Of The Aorta And Coronary Arteries.
A less common from of hemorrhage stroke is when an arteriovenous malformation (AVM) ruptures. AVM is an abnormal tangle of thin-walled blood vessels that is present at birth.
A Study found that migraines increase stroke risk during pregnancy.
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