Background/Objectives: Previous research has demonstrated that the lactate/albumin ratio (L/A) may predict mortality among critically ill patients. Based on pathophysiological rationale, L/A may also correlate with volume status, however such an association has not been investigated extensively. This retrospective cohort study aimed to confirm the prognostic value of L/A and to assess the prognostic value of L/A and its relationship with hypovolemia severity in intensive care unit (ICU) patients. Methods: We analyzed data from consecutive adult patients admitted to the ICU. Admission L/A was evaluated in relation to 30-day mortality and indirect markers of volume status (mean arterial pressure on admission, median dose of norepinephrine and fluid intake within the first 24 h of ICU stay). Results: A total of 1421 patients were included. L/A ≥ 0.06 (estimated on the basis of ROC curve using the Youden index) was an independent predictor of 30-day mortality (HR = 1.423; 95%CI 1.183–1.712; p < 0.001). L/A moderately correlated with markers of absolute or relative hypovolemia, i.e., lower mean arterial pressure (r = −0.353, p < 0.001) on admission, higher norepinephrine dose (r = 0.506, p < 0.001) and greater fluid intake (r = 0.233, p < 0.001) within the first 24 h of ICU stay. Furthermore, L/A ≥ 0.06 on admission was an independent risk factor for the implementation of continuous renal replacement therapy (OR = 2.134; 95%CI 1.652–2.757; p = 0.001). Conclusions: L/A is not only a predictor of poor prognosis but also may be a valuable indirect marker of the extent of hypovolemia in critically ill patients. Further prospective studies are necessary to assess if this parameter should incline a decision for more aggressive fluid management in hypovolemic patients.

Background/Objectives: ST-segment deviation (STD) on electrocardiography (ECG) may reflect myocardial injury in critically ill patients. However, its prognostic significance in non-cardiac intensive care unit (ICU) populations remains unclear. We aimed to assess the association between STD on ICU admission and 30-day mortality and to evaluate its incremental prognostic value beyond the SOFA score. Methods: In this retrospective single-center study, we included 307 consecutive ICU patients (median age: 64.0 years; 65.5% men). Patients with acute cardiac conditions were excluded. STD was defined as ≥1 mm ST elevation or depression in any lead on standard 12-lead ECG performed on admission. The primary outcome was 30-day all-cause mortality. Prognostic associations were assessed using multivariable Cox regression adjusted for SOFA score. Discriminative performance was evaluated by comparing ROC curves for models with and without STD, with bootstrap-based testing (1000 iterations) to assess significance. Results: STD was present in 126 patients (41.0%) and occurred more frequently in non-survivors (47.6% vs. 36.5%, p = 0.033. In Cox regression, STD was independently associated with 30-day mortality (HR = 1.534; 95% CI: 1.081–2.177; p = 0.017), even after adjustment for SOFA score. This association remained statistically robust in bootstrap validation. The addition of STD amplitude to the SOFA score modestly improved model discrimination with a borderline significant difference between the areas under the curve (ΔAUC = 0.005, p = 0.0581). Conclusions: ST-segment deviation on the admission ECG is an independent predictor of 30-day mortality in non-cardiac critically ill patients and may enhance risk stratification beyond the SOFA score.