I cannot commet on whether or not your grandmothers stroke
was caused by hypertension. In general, high blood pressure is one risk factor
. Others include diabetes, prior heart attack, abnormalities of heart rhythm, tobacco, family history of heart attack/stoke..to name a few. One type of stroke, hemmoragic stroke, can occur when the blood pressure is too high. This causes a blood clot to form in the brain after rupture of one of the vessels.