(A) Plasma concentrations of ATP in PCAS patients (n=15) were assessed by HPLC immediately after ROSC was regained. These levels were compared with plasma ATP concentrations in healthy controls (HC, n=8). Data are means ± SEM; ***p<0.001 (Mann-Whitney test). (B) Plasma concentrations of ATP, ADP, AMP, and adenosine (ADO) in PCAS patients were assessed with HPLC and grouped in non-survivors (n=8) and survivors (n=7) and compared to healthy controls (n=8). Data are shown as mean±SEM. Statistical comparisons were done with one-way ANOVA and post-hoc Tukey’s test or Kruskal-Wallis and post-hoc Dunn’s test when data were normally or not normally distributed, respectively; *p<0.05. (C) Plasma adenylate levels of two patients of each group were measured within 15 min of resuscitation and after 24 h.