Preconditioning With Limb Ischemia for Subarachnoid Hemorrhage

Inclusion Criteria: * Patients with aneurysmal subarachnoid hemorrhage whose initial angiogram show an aneurysm and patients with clipped aneurysm will be eligible for enrollment. * Patients will be enrolled within 96 hours of bleeding onset, if informed consent is obtained from the participant or health care proxy, as appropriate. Exclusion Criteria: * Hunt Hess Scale \> 4 * Inability to undergo limb preconditioning due to local wound or tissue breakdown, history of peripheral extremity vascular disease or patient discomfort. * Inability to obtain informed consent from the patient or a health care proxy. * Ankle-brachial index \< 0.7 * Inability to start limb preconditioning within 4 days of bleeding. * Inability to precondition a leg that is not-plegic (that is preserved anti- gravity strength) and has not been accessed for catheter angiography * Age\<18 years * Pregnant women * Prisoners