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The PIRO score stratifies patients with community-acquired pneumonia (CAP) by severity and 28-day mortality using four domains: Predisposition, Insult, Response, and Organ dysfunction. Analogous to PIRO framework in sepsis. PIRO for CAP was developed in an ICU-level population as an adjunct to CURB-65 and PSI with better discrimination of critically ill patients.
P — Predisposition: Comorbidities (COPD + Immunosuppression)
P — Predisposition: Age (Contribution Based on PIRO Formulation)
I — Insult: Multi-Lobar or Bilateral Pneumonia
I — Insult: Bacteremia (Positive Blood Culture)
R — Response: Hypothermia (Temp < 36°C)
R — Response: Leukopenia (WBC < 4 × 10⁹/L)
O — Organ Dysfunction: Respiratory (P/F Ratio < 250)
O — Organ Dysfunction: Renal (Creatinine > 177 μmol/L or AKI)
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