No South Korean study has been conducted on additional drugs of injection, other than epinephrine, in cardiac arrest (CA) treatment. In one study, steroid use in post-cardiac arrest (CA) patients with return of spontaneous circulation (ROSC) was investigated by examining the levels of blood cortisol and adrenal corticotropic hormone. The researchers found that patients showing relatively poorer results in the exams recorded lower. Therefore, steroid use could be considered for patients with weaker adrenal function among those with post-cardiac arrest (CA) return of spontaneous circulation (ROSC), according to the study.