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EUCAST breakpoints for short incubation disk diffusion allow rapid antimicrobial susceptibility testing (RAST) directly from positive blood cultures. We evaluate the RAST methodology and assess its potential added value in a setting of low prevalence of multidrug-resistant (MDR) organisms. In our two-part study, we performed RAST on 127 clinical blood cultures at 6 and 8 h and determined categorical agreement with direct susceptibility testing. We also measure the impact of susceptibility results on antimicrobial therapy compared to empirical treatment. Categorical agreement was 96.2% at 6 h (575/598 isolate-drug combinations) and 96.6% at 8 h (568/588 combinations). Major errors involved piperacillin/tazobactam in 16 of 31 cases. The second part of our study shows that AST reporting proved essential in correcting ineffective empirical therapy in 6.3% of the patients (8/126). EUCAST RAST is an inexpensive and reliable method of susceptibility testing, although care must be taken with reporting piperacillin/tazobactam. In support of RAST implementation, we show that AST remains of great importance in providing effective therapy, even in a setting of low MDR prevalence and elaborate antibiotic guidelines.

acta clinica belgica

EUCAST rapid antimicrobial susceptibility testing (RAST) compared to conventional susceptibility testing: implementation and potential added value in a tertiary hospital in Belgium