Fever is associated with earlier antibiotic onset and reduced mortality in patients with sepsis admitted to the ICU.

To evaluate the association of body temperature with mortality in septic patients admitted to the ICU from the ward. In addition, we intend to investigate whether the timing of antibiotic administration was different between febrile and afebrile patients and whether this difference contributed to mortality. This is a retrospective cohort study that included sepsis patients admitted to the ICU from the ward between July 2017 and July 2019. Antibiotic administration was defined as the initiation of antimicrobial treatment or the expansion of the antimicrobial spectrum within 48 h prior to admission to the ICU. Regarding vital signs, the most altered vital sign in the 48 h prior to admission to the ICU was considered. Two hundred and eight patients were included in the final analysis. Antibiotic administration occurred earlier in patients with fever than in patients without fever. Antibiotic administration occurred before admission to the ICU in 27 (90.0%) patients with fever and in 101 (64.7%) patients without fever (p = 0.006). The mortality rate in the ICU was 88 in 176 (50.0%; 95% CI 42.5-57.5%) patients without fever and 7 in 32 (21.9%; 95% CI 6.7-37.0%) patients with fever (p = 0.004). In the multivariate analysis, absence of fever significantly increased the risk of ICU mortality (OR 3.462; 95% CI 1.293-9.272). We found an inverse association between body temperature and mortality in patients with sepsis admitted to the ICU from the ward. Although antibiotic administration was earlier in patients with fever and precocity was associated with reduced mortality, the time of antibiotic administration did not fully explain the lower mortality in these patients.