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Purpose: To evaluate the association of estimated plasma volume (ePV) and plasma volume status (PVS) on admission with the outcomes in COVID-19-related acute respiratory distress syndrome (ARDS) patients., Materials and Methods: We performed a retrospective multi-center study on COVID-19-related ARDS patients who were admitted to the Mayo Clinic Enterprise health system. Plasma volume was calculated using the formulae for ePV and PVS, and these variables were analyzed for correlation with patient outcomes., Results: Our analysis included 1298 patients with sequential organ failure assessment (SOFA) respiratory score ≥ 2 (PaO 2 /FIO 2 ≤300 mmHg) and a mortality rate of 25.96%. A Cox proportional multivariate analysis showed PVS but not ePV as an independent correlation with 90-day mortality after adjusting for the covariates (HR: 1.015, 95% CI: 1.005-1.025, p = 0.002 and HR 1.054, 95% CI 0.958-1.159, p = 0.278 respectively)., Conclusion: A lower PVS on admission correlated with a greater chance of survival in COVID-19-related ARDS patients. The role of PVS in guiding fluid management should be investigated in future prospective studies., Competing Interests: Declaration of Competing Interest Rahul Kashyap: Grant and contracts - Gordan and Betty Moore Foundation, Jenssen and Jenssen LLC; all payments made to the institution. No conflict of interest related to this manuscript. Archer Kilbourne Martin: Consulting fees - Scientific Advisory Board, Attgeno AB; payments made to the institution. No conflict of interest related to this manuscript. Rest other authors declare that they have no competing interests., (Copyright © 2023 Elsevier Inc. All rights reserved.)

Purpose: Alactic base excess (ABE) is a novel biomarker defined as the sum of lactate and standard base excess and estimates the renal capability of handling acid-base disturbances in sepsis. The objective of this study is to see if ABE is an independent predictor of mortality in septic patients with and without renal dysfunction., Materials and Methods: We retrospectively studied 1178 patients with sepsis and septic shock. Patients were divided according to ABE values: 1) negative ABE (<-3 mmol/L); 2) neutral ABE (≥ - 3 and < 4 mmol/L); and 3) positive ABE (≥4 mmol/L). The effect of ABE on mortality was evaluated using Cox regression weight by inverse probability weighting (IPWT) analysis after propensity score assessment. Additionally, we performed a stratified analysis in patients with GFR > 60 mL/min/1.73 m2., Results: Negative ABE patients had higher mortality than patients with neutral ABE (adjusted HR 1.43; 95%CI 1.02-2.01). Also, in patients with GFR > 60 mL/min/1.73 m2 (n = 493), we observed higher mortality in patients with negative ABE (adjusted HR 2.43; 95%CI 1.07-5.53)., Conclusions: Negative ABE is an independent predictor of in-hospital mortality in septic patients with and without renal dysfunction., Competing Interests: Declaration of Competing Interest Authors declare no conflicts of interest., (Copyright © 2023 Elsevier Inc. All rights reserved.)