Effect of Early Balanced Crystalloids Before ICU Admission on Sepsis Outcomes

Abstract

Studies suggest that using balanced crystalloids (lactated Ringer's solution or Plasma-Lyte A) rather than saline (0.9%sodium chloride) may improve outcomes for patients with sepsis in the ED and ICU. What is the relative impact on sepsis outcomes of fluid composition during early resuscitation in the ED vsafter ICU admission? We performed a secondary analysis of the Isotonic Solutions and Major Adverse Renal Events Trial (SMART) data set, examining medical ICU patients with a diagnosis of sepsis (n= 1,641). SMART was a cluster-crossover trial comparing balanced crystalloids vssaline among critically ill adults. During the first 7months of SMART, fluid choice was controlled only in the ICU ("ICU-only period"). In the final 15months, fluid choice was coordinated between the ED and ICU ("ED and ICU period"). We performed logistic regression modeling for 30-day in-hospital mortality with an interaction term between randomized group (balanced crystalloids vssaline) and study period (ICU-only period vsED and ICU period). Three hundred and sixty-seven patients with sepsis were enrolled during the ICU-only period and 1,274 were enrolled during the ED and ICU period. Thirty-day in-hospital mortality occurred in 47 of 142 patients (33.1%) in the balanced crystalloid group vs74 of 225 patients (32.9%) in the saline group during the ICU-only period (OR, 1.14; 95%CI, 0.70-1.88) and in 170 of 682 patients (24.9%) in the balanced crystalloid group vs181 of 592 patients (30.6%) in the saline group in the ED and ICU period (OR, 0.68; 95%CI, 0.52-0.89) (P value for interaction, .07), consistent with a beneficial effect of balanced crystalloid primarily in the ED and ICU period. Among patients with sepsis, the effect of balanced crystalloids vssaline on mortality was greater among patients for whom fluid choice was controlled starting in the ED compared with starting in the ICU.