Bacteremia (or Fungemia) will be defined as isolation of a pathogen from at least one blood culture set (in cases of coagulase negative Staphylococcus species, or Corynebacterium species, 2 positive blood culture sets will be required). Septic shock will be defined as bacteremia / fungemia plus circulatory failure with at least 30% increase in norepinephrine infusion requirements after day 3 postarrest.