Sepsis in Critically Ill Children in Bolivia: Multicenter Retrospective Evaluation of the Phoenix Criteria for Sepsis in a 2023 Cohort

Objectives: We evaluated the Phoenix criteria and the Phoenix Sepsis Score in a multicenter retrospective cohort of critically ill children with a clinical diagnosis of sepsis or septic shock in Bolivia. In addition, we aimed to assess whether management in a PICU at high altitude in the Bolivian Andes was associated with the performance of the respiratory dysfunction component in the Phoenix Sepsis Score. Design: Multicenter retrospective cohort study. Setting: Fourteen PICUs in Bolivia. Patients: Children admitted to the PICU with a clinical diagnosis of sepsis or septic shock from January 2023 to December 2023. Interventions: None. Measurements and Main Results: There were 273 patients with a diagnosis of sepsis in 2023, of which 257 (94.1%) met the 2024 Phoenix criteria for sepsis, and 166 (60.8%) met the systemic inflammatory response syndrome (SIRS)-based criteria for sepsis. Among the 257 patients meeting Phoenix sepsis criteria, 86 died (33.5%). Of the patients with Phoenix-based sepsis, there were 100 of 257 (38.9%) who were SIRS-negative, and 27 of 100 died (27.0%). After correcting the oxygenation indices for altitude, 149 of 273 patients (54.6%) had a lower Phoenix respiratory score and an associated mortality more consistent with the expected mortality of the newly derived subscore. Patients at higher altitudes had higher hemoglobin levels and higher estimated oxygen carrying capacity, and these data were independently associated with lower odds of mortality after controlling for altitude-corrected Phoenix score. Conclusions: In this 2023, retrospective cohort of PICU patients with sepsis in Bolivia, we have found that the majority met the 2024 Phoenix sepsis criteria, but less than two-thirds met the SIRS-based criteria for diagnosis. However, the respiratory score in the Phoenix criteria overestimated the severity of respiratory dysfunction in more than half of the cohort, likely because the score does not take account of the Andean adaptation to high altitude, with higher oxygen carrying capacity.