Fig. 4

Changes in brain tissue oxygenation (PtO₂, % change from baseline) during CA and ECPR with and without H₂. n = 7 per group (two-way repeated-measures ANOVA followed by Sidak’s correction, F = 2.51). **P = 0.009 vs. the placebo, ^##P = 0.007, ^###P = 0.0002, ^####P < 0.0001 vs. the baseline in the H₂ group