Home >> Tag Archives: Antimicrobial susceptibility testing/resistance

Tag Archives: Antimicrobial susceptibility testing/resistance

Leaving behind outdated AST breakpoints

May 2022—Among the countless interruptions COVID-19 has inflicted on the medical community, one of the most obvious has been conversational. In the face of a global pandemic, other topics can seem unworthy of discussion. But as some post-pandemic normalcy creeps back in, so does the focus on topics of equal, if less dramatic, importance.

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The impact of diagnostics on antimicrobial decisions

April 2022—A study published last fall examined antimicrobial prescribing in gram-negative bloodstream infections based on three rapid diagnostic panels and using what’s known as the DOOR-MAT framework. The study’s findings were explained in a CAP TODAY webinar on stewardship interventions to optimize the management of gram-negative bacteremia. It was presented last December and made possible by a special educational grant from BioFire.

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Resistance targets: blood culture ID panel pitfalls

May 2021—Most of the time, bloodstream infection antimicrobial resistance results achieved with blood culture molecular ID panels will be accurate. When and why they might not be was the focus of an AMP 2020 virtual session. “I don’t want to lead anyone to believe that these are not good, accurate, and important types of tests,” Richard E. Davis, PhD, D(ABMM), MLS(ASCP)CM, said of the panels.

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AST breakpoints: a case of not aging gracefully

April 2020—When Romney Humphries, PhD, D(ABMM), was section chief for clinical microbiology at UCLA Medical Center, it wasn’t unusual for her to take calls from worried clinicians who were concerned about patients who’d been transferred to the hospital for a higher level of care. The accompanying laboratory reports would indicate the presence of an isolate that was susceptible to a particular drug. But when Dr. Humphries’ lab did its own testing, the results were strikingly different: The isolate was drug resistant. When Dr. Humphries would call the first lab, the reason for the discrepancy became clear. “Sure enough, they were using old breakpoints,” says Dr. Humphries, who is now chief scientific officer, Accelerate Diagnostics, and professor of pathology, University of Arizona. Unlike Bordeaux, antimicrobial susceptibility test breakpoints do not age well. Over time, they might no longer be clinically useful, even as they continue to be used clinically. Dr. Humphries’ anecdote is, of course, just that—an anecdote.

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