Patel JK, et al. - A systematic review and meta-analysis was planned to ascertain the association between intra-arrest and post-arrest hyperoxia and mortality in adults with cardiac arrest (CA). Researchers included 16 observational studies with a total of 40,573 adult patients. In adults with CA, intra-arrest hyperoxia was noted to be associated with lower mortality while post-arrest hyperoxia was noted to be associated with higher mortality.