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Re: How to prevent another stroke?
Keep in mind that there are two completely different types of stroke. One is an ischemic stroke, which is due to a blockage in an artery in the brain (such as due to a blood clot or atherosclerosis) that deprives blood to an area of the brain. The other type is a hemorrhagic stroke, in which case a blood vessel ruptures and causes bleeding into the brain that then damages the tissue where the blood spills in.
In terms of hemorrhagic stroke, primarily keeping one's blood pressure under control to decrease chances of developing an aneurysm (a ballooning out of a blood vessel wall) or rupturing of the vessel is the approach to take. But, sometimes there is nothing that really can be done to prevent these.
For ischemic stroke, things that lower the risk of atherosclerosis and blood clots are important...watching blood lipid levels (cholesterol and triglycerides, for example), or avoiding smoking. If someone has had this type of stroke, they may be prescribed "blood thinners" that block some of the clotting factors in blood to help break up existing blood clots or prevent new ones. This type of stroke can also have a genetic component...some people have mutations in genes for blood clotting factors that make them more susceptible to the types of clots that cause strokes.
In terms of flying, it is best to ask a physician who knows the details of that patient's case. My general thoughts are that the altitude and cabin pressure changes might cause some problems for someone who has had hemorrhagic strokes. In terms of ischemic strokes, the big risk isn't so much flying as sitting still too long and risking developing deep vein thrombosis (usually in the legs) and then having those clots break off and lodge in either the lungs or brain. Getting up and walking around as frequently as possible during a flight, or making frequent stops to walk around during long car rides would be advisable. (Actually, those are good ideas for anyone on long flights or long car trips, not just those with a history of stroke.)
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