• Zhijiang Qi, Qiang Zhang, Bo Liu, Fei Shao, and Chunsheng Li.
• All authors: Department of Emergency Medicine, Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China.
• Crit. Care Med. 2019 Jul 1; 47 (7): e538-e546.

ObjectivesAfter return of spontaneous circulation, patients who experienced out-of-hospital cardiac arrest present an impaired innate immune response that resembles sepsis. Presepsin, a new biomarker for sepsis, has not been studied in out-of-hospital cardiac arrest patients. This study explored the role of presepsin in evaluating the prognosis and early innate immune alteration of out-of-hospital cardiac arrest patients after return of spontaneous circulation by observing presepsin levels, CD14, and human leukocyte antigen-DR expression on monocytes.DesignRetrospective analysis.SettingThe emergency department of an urban university tertiary hospital.ParticipantsOne hundred sixty-five out-of-hospital cardiac arrest patients with return of spontaneous circulation more than 12 hours, and 100 healthy individuals.InterventionsNone.Measurements And Main ResultsPlasma presepsin and procalcitonin levels were tested after resuscitation (day 0) and on days 1 and 3 after return of spontaneous circulation. Presepsin levels were higher in out-of-hospital cardiac arrest patients than in healthy individuals. In the first 3 days, presepsin and procalcitonin levels were persistently lower in 28-day survivors and patients with favorable neurologic outcome patients than in 28-day nonsurvivors and patients with unfavorable neurologic outcome. On days 0, 1, and 3, different cut-off values of presepsin showed prognostic value for 28-day mortality and favorable neurologic outcomes similar to procalcitonin. CD14 and human leukocyte antigen-DR expression on monocytes were analyzed by flow cytometry. Compared with controls, CD14 expression in out-of-hospital cardiac arrest patients increased on day 1 and began to decrease on day 3, whereas human leukocyte antigen-DR+ monocyte percentages decreased on days 1 and 3. Presepsin and procalcitonin had a low positive correlation with CD14 expression and a strong negative correlation with human leukocyte antigen-DR+ monocyte percentages on day 1.ConclusionsPlasma presepsin concentrations are independent prognostic factors for out-of-hospital cardiac arrest patients after return of spontaneous circulation and are correlated with abnormal CD14 and human leukocyte antigen-DR expression on monocytes. Monitoring presepsin levels may be helpful for evaluating the prognosis and impaired innate immune response in the early period after return of spontaneous circulation.

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