Hydrogen's Feasibility and Safety as a Therapy in Extracorporeal Cardiopulmonary Resuscitation (Hydrogen-FAST): study protocol for a trial of inhaled hydrogen gas as an adjunctive therapy in refractory cardiac arrest. - Habet, Victoria; DeWaard, Tysen; Boggs, Krislyn M.; Fetch, Alix; Puente, Bao Nguyen; Sleeper, Lynn A.; Kheir, John N. (Trials, 2025)