An Interpretable EHR-Derived Lactate–Hemodynamic Framework for Mortality Risk Stratification in ICU Sepsis: A MIMIC-IV Derivation and eICU Validation Study
This study demonstrates that an interpretable framework classifying ICU sepsis patients into four hypoperfusion phenotypes based on lactate, mean arterial pressure, and vasopressor use effectively stratifies mortality risk, with the combined hypoperfusion phenotype showing the strongest and most reproducible association with adverse outcomes across both MIMIC-IV and eICU cohorts.