Table 6.

ATS/IDSA criteria to define severe CAP. Adapted from File et al. [84]

Major criteria	Minor Criteria
Septic shock treated with vasopressors Respiratory failure necessitating mechanical ventilation	Respiratory rate ≥ 30 bpm Confusion or disorientation Hypothermia (temperature < 36ºC) Hypotension necessitating aggressive fluid resuscitation Leukopenia (<4000 cells/mm3). Thrombocytopenia (<100000 platelets/mm3). Uremia: BUN ≥ 20 mg/dL. Ratio PaO2to FiO2 ≤ 250 Multilobar (≥2) infiltrates

bpm: breath per minute, BUN: blood urea nitrogen level, PaO₂: partial pressure of arterial oxygen, FiO₂: fraction of inspired oxygen.