The brain cells function requires a constant delivery of Oxygen and Glucose by the blood stream. A stroke othewise called as Cerebro Vascular Accident {CVA} occurs when blood supply to the part of the brain is disrupted causing brain cells to that part to die. Blood flow can be compromised by a verity of mechanisms. Blockage of an artery. Narrwong of the small arteries within the brain cause a lacunar stroke. Blockage of a single arteriole can affect a very small area of brain causing that tissue to die {infarct}. Hardening of arteries leading to brain {atherosclerosis}. There are four major blood vessels that supplies blood to brain. The anterior circulation of the brain that controls most activity, sensation, thought, speech and emotion is supplied by the carotid arteries. The posterior circulation which supplies the brain stem and the cerebellum controling the automaitc parts of brain function and co-ordination is supplied by this vertbrobasilar arteries. If these arteries become narrow as a result of atherosclerosis, plaque or cholesterol , debris can make brake off and float downstream clogging the blood supply to a part of the brain. As opposed to lacunar strokes, larger part of the brain can loose blood supply and this may produce more symptoms than a lacunar stroke.
Embolism to the brain from the heart: In some instances blood clot can form within the heart. The potential exists for them to break off and travel to the arteries in the brain can cause stroke. Rupture of an artery, hemorrahage, the most reason for have bleeding within the vein is un-controlled high blood pressure. Other situations include aneurysms that a leak of a rupture or arteriovenous malfunctions in which there is an abnormal collection of blood vessels that are fragile and cal bleed.
Brain Stroke symptoms
- Confusion. Trouble speaking and/or understanding.
- Sometimes weakness in the muscles of the face can cause drooling.
- The loss of voluntary movements and sensation may be partial or complete.
- Trouble walking, dizziness loss of balance or co-ordination.
- Severe headache with no known cause.
