Question: My uncle suffered a stroke a month ago and since then his arm and leg have been paralyzed. Why is it? Beatriz (Argentina).
Answer: A stroke is a stroke, usually due to a clot. One of the vessels of the brain closes and stops passing blood. Because of this, the brain tissue does not receive the oxygen it needs and its cells die (heart attack). Consequently, the functions performed by these cells can no longer be performed. Thus, if the brain cells that moved the right leg disappear, the patient will not be able to move the right leg. Occasionally the functions are recovered because other nearby cells adopt the functions from which they died. All this can be explained in more detail by your neurologist, who is the health professional expert in this matter.