 The purpose of this study is to determine whether reducing a patients body temperature mild hypothermia of 33 degrees Centigrade will significantly reduce the risk of brain injury notably reperfusion injury and hemorrhagic conversion in patients that 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 that have undergone hypothermia to those that have not. 