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Objective We examined whether patients with a positive SeptiFast (SF) assay (LightCycler SeptiFast; Roche Diagnostics, Basel, Switzerland) developed higher long-term mortality, a more difficult course of treatment, and a higher antimicrobial treatment cost than patients with a negative SF assay. Methods We performed a post-hoc analysis of data collected in a 1-year prospective interventional study of adults with severe sepsis and septic shock. In addition to the standard treatment, an additional 5 ml of blood was obtained for an SF assay, and the antimicrobial treatment was changed according to the SF results. Results We included 57 patients, and the SF assay was positive (SF+) in 10 (17.5%) and negative (SF-) in 47 (82.5%) patients. A trend toward a higher 6-month, 1-year, and 2-year mortality rate was observed in the SF+ group. In the SF+ group, we observed a significantly greater need for second-line vasopressor therapy, a higher initial procalcitonin concentration, and higher maximum C-reactive protein and lactate concentrations. We found no significant differences in cost of antimicrobial treatment between the SF+ and SF- groups. Conclusions We observed a trend toward higher long-term mortality and a more difficult course of treatment but no difference in the cost of antimicrobial treatment.

Mortality, intensive care treatment, and cost evaluation: Role of a polymerase chain reaction assay in patients with sepsis