Background and Purpose: Poor-grade subarachnoid hemorrhage still has a poor prognosis. This randomized controlled clinical trial evaluated intracisternal magnesium sulfate infusion combined with intravenous hydrogen therapy in patients poor-grade hemorrhage. Methods: Thirty-seven were to Mg+H 2 , Mg, control groups. Mg groups received (2.5 mmol/L) at 20 mL/h for 14 days. group also hydrogen-ric...