Figure 4From: Demographics, guidelines, and clinical experience in severe community-acquired pneumoniaPIRO as a mortality risk assessment tool. ARDS, acute respiratory distress syndrome; CAP, community-acquired pneumonia; COPD, chronic obstructive pulmonary disease; ICU, intensive care unit; PIRO, Predisposition, Infection, Response, and Organ dysfunction. Reproduced with permission from Rello and coworkers [36].Back to article page