What is the major advantage of ethanol as a lock solution?

• A. It is universally tolerated with no side effects
• B. There is no known microbial resistance to ethanol
• C. It prevents catheter occlusion entirely
• D. It eliminates all risk of infection

Answer: (B)

The major advantage of ethanol as a lock solution is that microorganisms do not readily develop resistance to it, so its antimicrobial effect remains broadly effective across many pathogens over time. Ethanol works by rapidly denaturing proteins and disrupting cell membranes, giving it broad-spectrum activity that is less prone to the resistance seen with many antibiotics. This makes ethanol locks particularly useful for reducing catheter-related bloodstream infections because the risk of pathogens adapting to it is low.

Keep in mind that while ethanol has these advantages, it isn’t without downsides. It isn’t universally tolerated in all patients, some catheters can be damaged or experience occlusion with ethanol, and it does not eliminate all infection risk or issues related to catheter function.