For ESBL-producing organisms, which class is preferred and why?

For ESBL-producing organisms, which class is preferred and why?

• A. Cephalosporins; ESBLs do not hydrolyze them
• B. Monobactams; ESBLs hydrolyze many penicillins but not monobactams
• C. Carbapenems; ESBLs hydrolyze many penicillins and cephalosporins, but carbapenems remain active
• D. Fluoroquinolones; ESBLs are susceptible to them

Answer: (C)

ESBLs destroy many penicillins and cephalosporins by hydrolyzing their beta-lactam rings, so those drugs often fail against infections caused by these organisms. Carbapenems resist this hydrolysis and therefore tend to remain active where ESBL producers would otherwise neutralize other beta-lactams. Because of their reliable activity and broad coverage against ESBL-producing bacteria, carbapenems are the preferred class for treating these infections. (Note: in some cases, other options may be considered if carbapenemase production is unlikely or alternative agents are appropriate, but carbapenems are the safest and most dependable choice in this scenario.)

ESBLs destroy many penicillins and cephalosporins by hydrolyzing their beta-lactam rings, so those drugs often fail against infections caused by these organisms. Carbapenems resist this hydrolysis and therefore tend to remain active where ESBL producers would otherwise neutralize other beta-lactams. Because of their reliable activity and broad coverage against ESBL-producing bacteria, carbapenems are the preferred class for treating these infections. (Note: in some cases, other options may be considered if carbapenemase production is unlikely or alternative agents are appropriate, but carbapenems are the safest and most dependable choice in this scenario.)