Figure 1. Experimental protocol and different timing of hyperoxygenation in each group (n=16/group).

CA indicates cardiac arrest; CPR, cardiopulmonary resuscitation; NC, normoxic control; O2_CPR, ventilated with 100% O2 during CPR; O2_CPR+postresuscitation, ventilated with 100% O2 during CPR and the first 3 hours of postresuscitation; O2_postresuscitation, ventilated with 100% O2 during the first 3 hours of postresuscitation; and VF, ventricular fibrillation.