Clinical factors associated with bloodstream infection at the emergency department

BACKGROUND: Bloodstream infection (BSI) is a common urgent condition at the emergency department (ED). However, current guidelines for diagnosis do not specify the juncture at which blood cultures should be taken. The decision whether or not to obtain hemoculture is based solely upon clinical judgment and potential outcomes of inappropriately ordered cultures. This study aimed to find clinical factors present on ED arrival that are predictive of bloodstream infection. METHODS: This study was conducted retrospectively at the ED of a single tertiary care hospital in Thailand. We included adult patients with suspected infection based on blood culture who were treated with intravenous antibiotics during their ED visit. Independent positive predictors for positive blood culture were calculated by logistic regression analysis. RESULTS: A total of 169,578 patients visited the ED during the study period, 12,556 (7.40%) of whom were suspected of infection. Of those, 8177 met the study criteria and were categorized according to blood culture results (741 positive; 9.06%). Six clinical factors, including age over 55 years, moderate to severe CKD, solid organ tumor, liver disease, history of chills, and body temperature of over 38.3 °C, were associated with positive blood culture. CONCLUSIONS: Clinical factors at ED arrival can be used as predictors of bloodstream infection.