Caracterización de los pacientes con bacteriemia adquirida en la comunidad atendidos en el servicio de urgencias de un hospital de alta complejidad

Objective: to describe the clinical and laboratory characteristics of the patients that are diagnosed with a community-acquired bloodstream infection in an emer-gency service of a high complex institution. Methods: Retrospective cohort that describes all patients older than 18 years with a diagnosis of CAB, who were admitted to the emergency department of the San Ignacio University Hospital between January-December 2021. Results: 211 patients were included. The urinary source was the most frequent (36%), followed by the abdominal focus (34,1%). The most frequent microorganisms were E. coli (55,9%), K. pneumoniae (10,4%) and S. aureus (9%). A natural resistance pattern was found in 75.9% and 22.9% of K. pneumoniae and E. coli respectively. 18,6% of E. coli showed extended-spectrum beta-lactamase production (ESBL). 36,8% of S. aureus were resistant to methicillin. Hospital mortality was higher for S. aureus compared to overall mortality (44,4% vs 21,8% p=0,026). Conclusion: E. coli is the main etiology of community-acquired bacteremia in this cohort with less than 25% of isolates expressing a natural resistance pattern. E. coli ESBL resistance pattern was around 20%. In-hospital mortality was higher in patients with S. aureus.