Correlation Between Age Shock Index and Perfusion Index with Emergency Severity Index and its Predictive Value on In-hospital Mortality

Objective: Perfusion index (PI), shock index (SI), modified SI (MSI), and age SI (ASI) are valuable markers used to predict the clinical course and mortality of patients in various intensive care units and emergency departments (ED). We investigated the relationship between these markers and emergency severity index (ESI) and their value in predicting in-hospital mortality.
Material and Methods: In this prospective, cross-sectional, single-centered study, the vital values of the patients and the PI were measured and categorized according to ESI. The correlation between SI, MSI, ASIs, and PI among the ESI categories and their predictive values for in-hospital mortality were calculated.
Results: We established statistically significantly lower PI values and significantly higher values in the ASI in the group with in-hospital mortality compared to survivors (p=0.001, <0.001, respectively). The area under curve score for in-hospital mortality of the PI of 0.723 and ASI are 0.723 and 0.807, respectively. The specificity of PI and the sensitivity of ASI are 91.62% and 91.67%, respectively, and negative predictive values of those are 98.66% and 99.67%, respectively.
Conclusion: Adding PI and ASI to existing triage scores, such as ESI, may improve triage specificity in unselected patients who are admitted to the ED.

Keywords: Perfusion index, shock index, mortality, triage