Machine learning for hemodynamic instability prediction and hemorrhage management in trauma and perioperative care.

purpose of reviewHemodynamic instability and uncontrolled hemorrhage remain leading causes of preventable morbidity and mortality in trauma and perioperative critical care. This review summarizes recent advances in machine learning-based approaches for early detection before overt decompensation and for supporting time-critical hemorrhage management in trauma patients. RECENT

findingsRecent studies have explored machine learning across multiple stages of trauma care, including early warning systems, outcome and mortality prediction, prediction of massive transfusion needs, risk stratification, and bleeding monitoring. Outcome prediction - particularly mortality and complications such as sepsis - remains one of the most extensively studied domains. More recent work has increasingly favored neural network-based architectures, including deep and hybrid models, reflecting their capacity to model complex, high-dimensional, and temporal physiologic data, while ensemble methods such as extreme gradient boosting remain widely used due to their robustness to missing data and class imbalance. Although many models outperform traditional clinical scores in retrospective analyses, performance frequently declines during external validation, and few systems have demonstrated clinical impact in prospective or workflow-integrated settings. SUMMARY: Machine learning-based predictive analytics show promise for anticipating hemodynamic instability and guiding hemorrhage management before conventional vital-sign thresholds are crossed. However, clinical adoption remains constrained by data quality, generalizability, interpretability, and integration into time-critical workflows. Future progress will depend on incremental performance gains and physiology-informed model design, rigorous external validation, and careful positioning of machine learning tools as decision-support systems that augment - rather than replace - clinician judgment.