Association of the Endothelial Activation and Stress Index (EASIX) with short-term mortality in critically ill patients with congestive heart failure: A retrospective cohort study from the MIMIC database.

The highest EASIX quartile was associated with significantly higher 30-day all-cause mortality compared to the lowest quartile in critically ill CHF patients.

• Among 4556 patients, the highest EASIX quartile (Q4) had a 44.2% 30-day mortality rate versus 19.2% in Q1.
• Adjusted hazard ratio for Q4 vs Q1 was 1.60 (95% CI: 1.27–2.02, P < .001).
• Median patient age was 72.1 years, and 42.8% were female.
• Data were drawn from the MIMIC-IV database covering 2008–2022.

A nonlinear association was observed between ln(EASIX) and 30-day mortality, with an inflection point at ln(EASIX) = 0.05.

• Nonlinearity was confirmed by restricted cubic spline analysis (nonlinearity P = .008).
• Beyond the inflection point of ln(EASIX) = 0.05, each unit increase in ln(EASIX) conferred a 14.2% higher mortality risk (HR = 1.142, 95% CI: 1.062–1.227).
• The relationship below the inflection point was not described as statistically significant in the same manner.

EASIX remained an independent predictor of short-term mortality after full adjustment for severity scores and treatments.

• Multivariable Cox regression was used with adjustment for severity scores and treatments.
• The highest quartile (Q4) maintained a 60% increased mortality risk after full adjustment (adjusted HR = 1.60, 95% CI: 1.27–2.02).
• EASIX is calculated as lactate dehydrogenase divided by creatinine divided by platelets.
• The study design was a retrospective cohort study using MIMIC-IV data.

EASIX was found to be particularly valuable as a mortality predictor in nonsepsis populations with critical CHF.

• Subgroup analyses were performed as part of the analytical approach.
• The authors specifically noted EASIX as 'particularly valuable in nonsepsis populations.'
• The overall cohort included 4556 adults with CHF admitted to the ICU, stratified by ln(EASIX) quartiles.

Endothelial injury, as quantified by EASIX, plays a role in worsening congestive heart failure outcomes in critically ill patients.

• EASIX was designed to capture endothelial activation and stress through its components: lactate dehydrogenase, creatinine, and platelets.
• The study was motivated by the previously unquantified role of endothelial injury in worsening CHF.
• The primary endpoint was 30-day all-cause mortality in ICU-admitted CHF patients.
• The authors conclude that EASIX 'refines risk stratification beyond conventional severity scores.'