The purpose of this study is to determine whether reducing a patient's body temperature (mild
hypothermia of 33 degrees Centigrade) will significantly reduce the risk of brain injury
(notably reperfusion injury and hemorrhagic conversion) in patients who have suffered a
significant interruption of blood flow to an area of brain (occlusion of large proximal
cerebral artery) and have undergone successful removal of that interruption
(revascularization).This will be achieved by comparing patients who have undergone
hypothermia to those who have not.