 The researchers will also correlate the level of identified markers to how well the patient performs upon discharge from the hospital and at followup for up to two years from discharge, using Modified Rankin Scale scores and Glasgow Outcome Scale GOS. As a part of followup, researcher will assess time to return to work if applicable, complaints, results of followup laboratory complete blood counts, coagulation studies, response to anti-platelet medications including aspirin resistance assay and the p2yp12 assays, and basic metabolic panels and imaging, and an updated complete history and physical to identify new conditions that may have resulted post-ischemia. This information will be collected at the time of followup with the neurosurgeons. Once this is done, if a candidate microRNA or protein is identified, the researchers will share the results again in a manner that excludes any patient specific information with our collaborators Department of Health and Human Services associated organizations such as the NIH. 