NEFL and cardiac arrest: In line with the prognostic characteristics, the mean (SD) fold changes of NfL and t-tau increased substantially at 48 hours (86.2 [121.0] and 67.7 [166.0], respectively) (Figure 3) and 72 hours (78.8 [110.0] and 57.6 [170.0], respectively) (Figure 3) after cardiac arrest in the poor outcome group while mean (SD) p-tau fold changes were lower (1.9 [2.6] at 48 hours and 1.3 [0.8] at 72 hours).