(A) Time series of averaged percentage cerebral blood flow (CBF) change relative to the baseline after cardiac arrest and cardiopulmonary resuscitation. CBF was measured by continuous arterial spin labeling in cortex, caudoputamen, hippocampus, and whole brain. Gray shaded areas indicate inhalation of either 40 ppm nitric oxide (NO) mixed with air or 7% carbon dioxide (CO₂) with 21% oxygen. N = 6. (B) Averaged percentage CBF change relative to the baseline after cardiac arrest and cardiopulmonary resuscitation in response to the inhalation of NO and CO₂. N = 6. ***P < 0.001 versus NO and baseline. Data were analyzed using one-way ANOVA with a Bonferroni post hoc test.