Endovascular coiling may receive increased consideration in the elderly ( 70 y of age), in those presenting with poor-grade WFNS classification (IV/V) aSAH, and in those with aneurysms of the basilar apex. Class IIb, Level C New 12. Stenting of a ruptured aneurysm is associated with increased morbidity and mortality. Class III, Level C New 13. Annual monitoring of complication rates for surgical and interventional procedures is reasonable. Class IIa, Level C New 14. A hospital credentialing process to ensure that proper training standards have been met by individual physicians treating brain aneurysms is reasonable. Class IIa, Level C New 15. Prophylactic hypervolemia or balloon angioplasty before the development of angiographic spasm is not recommended. Class III, Level B New 16. Transcranial Doppler is reasonable to monitor for the development of arterial vasospasm. Class IIa, Level B New 17. Perfusion imaging with CT or magnetic resonance can be useful to identify regions of potential brain ischemia. Class IIa, Level B New 18. Weaning EVD over 24 hours does not appear to be effective in reducing the need for ventricular shunting. Class III, Level B New 19. Routine fenestration of the lamina terminalis is not useful for reducing the rate of shunt-dependent hydrocephalus and therefore should not be routinely performed. Class III, Level B New 20. Aggressive control of fever to a target of normothermia by use of standard or advanced temperature modulating systems is reasonable in the acute phase of aSAH. Class IIa, Level B New 21. The use of packed red blood cell transfusion to treat anemia might be reasonable in patients with aSAH who are at risk of cerebral ischemia. The optimal hemoglobin goal is still to be determined. Class IIb, Level B New 22. Heparin-induced thrombocytopenia and deep venous thrombosis are relatively frequent complications after aSAH. 