Cardiac arrest is one of the critical illnesses that is directly life-threatening, and patients who survive cardiac arrest develop severe neurological deficits or even die. The effectiveness of drugs to improve neurological function in resuscitated brain-injured patients has been a focus of research in the field of resuscitation. Butanephthalein has an ameliorating effect on the damage of central nervous function in patients with acute ischemic stroke, and can promote the improvement of patients' neurological deficits. On this basis, the present study was designed as a multicenter, prospective randomized controlled experiment, with internationally accepted methods for assessing near-term and long-term neurological function, to determine the effectiveness of butalbital in improving neurological function after cardiac arrest, with the aim of searching for new methods and ideas to improve neurological function and prognosis after cardiac arrest.