Antibiotic Timing and Progression to Septic Shock Among Patients in the ED With Suspected Infection

Abstract

Background: Recent medical society opinions have questioned the use of early antimicrobials in patients with sepsis, but without septic shock.

Research question: Is time from ED presentation to administration of antibiotics associated with progression to septic shock among patients with suspected infection?

Study design and methods: This was a retrospective cohort study from March 2007 through March 2020. All adults with suspected infection and first antimicrobial administered within 24 h of triage were included. Patients with shock on presentation were excluded. We performed univariate and multivariate logistic regression analyses predicting progression to septic shock.

Results: Seventy-four thousand one hundred fourteen patient encounters were included in the study. Five thousand five hundred ten patients (7.4%) progressed to septic shock. Of the patients who progressed to septic shock, 88% had received antimicrobials within the first 5 h from triage. In the multivariate logistic model, time (in hours) to first antimicrobial administration showed an OR of 1.03 (95% CI, 1.02-1.04; P < .001) for progression to septic shock and 1.02 (95% CI, 0.99-1.04; P = .121) for in-hospital mortality. When adjusted for severity of illness, each hour delayed until initial antimicrobial administration was associated with a 4.0% increase in progression to septic shock for every 1 h up to 24 h from triage. Patients with positive quick Sequential Organ Failure Assessment (qSOFA) results were given antibiotics at an earlier time point than patients with positive systemic inflammatory response syndrome (SIRS) score (0.82 h vs 1.2 h; P < .05). However, median time to septic shock was significantly shorter (P < .05) for patients with positive qSOFA results at triage (11.2 h) compared with patients with positive SIRS score at triage (26 h).

Interpretation: Delays in first antimicrobial administration in patients with suspected infection are associated with rapid increases in likelihood of progression to septic shock. Additionally, qSOFA score has higher specificity than SIRS score for predicting septic shock, but is associated with a worse outcome, even when patients receive early antibiotics.

Keywords: SIRS; antibiotics; qSOFA; septic shock; suspected infection.