CXCL8 and cardiac arrest: IL-8 mRNA expression levels showed a peak immediately after cardiac arrest followed by a significant decrease with minimal levels after 12–72 h (1351 ± 489 (A) versus 71 ± 19 (12 h), 1351 ± 489 (A) versus 12 ± 2 (24 h), 1351 ± 489 (A) versus 13 ± 3 (48 h), and 1351 ± 489 (A) versus 12 ± 3 (72 h); p < 0.001).