CIC Antimicrobial Stewardship 3 — Questions and Answers
Question 1: Which antibiotic class is most strongly associated with the development of Clostridioides difficile infection (CDI)?
- Macrolides
- Fluoroquinolones, clindamycin, and cephalosporins (Correct answer)
- Nitrofurantoin
- Metronidazole
Correct answer: Fluoroquinolones, clindamycin, and cephalosporins
Fluoroquinolones, clindamycin, and cephalosporins are most strongly linked to CDI because they disrupt gut flora and create an environment permissive for C. difficile colonization and toxin production.
Question 2: What does the term 'antibiotic timeout' refer to in stewardship practice?
- A mandatory pause in antibiotic administration for patient safety
- A scheduled reassessment of antibiotic therapy at 48-72 hours to determine continued need (Correct answer)
- The time limit for a pharmacist to approve an antibiotic order
- Withholding antibiotics pending culture results
Correct answer: A scheduled reassessment of antibiotic therapy at 48-72 hours to determine continued need
An antibiotic timeout is a deliberate reassessment at 48-72 hours, when preliminary culture data are available, to confirm the indication, spectrum, dose, and duration are still appropriate.
Question 3: When evaluating urine cultures, stewardship programs emphasize distinguishing asymptomatic bacteriuria (ASB) from UTI primarily because:
- ASB requires broader-spectrum antibiotics than UTI
- Treating ASB does not improve outcomes in most patients and drives resistance (Correct answer)
- ASB cultures always show polymicrobial growth
- UTI cultures require fungal susceptibility testing
Correct answer: Treating ASB does not improve outcomes in most patients and drives resistance
Treating ASB in most patient populations confers no clinical benefit, exposes patients to antibiotic side effects, and selects for resistant organisms, making diagnosis stewardship critical.
Question 4: Which of the following best describes the role of a clinical pharmacist in an antimicrobial stewardship program?
- Pharmacists only approve or deny antibiotic orders
- Pharmacists conduct prospective audit and feedback, optimize dosing, and educate prescribers (Correct answer)
- Pharmacists are responsible solely for IV-to-oral conversions
- Pharmacists manage infection control policies
Correct answer: Pharmacists conduct prospective audit and feedback, optimize dosing, and educate prescribers
Clinical pharmacists are core ASP members who perform prospective audit and feedback, pharmacokinetic/pharmacodynamic dosing optimization, IV-to-oral conversions, and prescriber education.
Question 5: A hospital notices rising rates of extended-spectrum beta-lactamase (ESBL)-producing Enterobacteriaceae. Which stewardship action directly addresses this trend?
- Increasing vancomycin use
- Restricting carbapenems to ESBL-confirmed infections only (Correct answer)
- Reducing contact precautions
- Promoting fluoroquinolone use as first-line therapy
Correct answer: Restricting carbapenems to ESBL-confirmed infections only
Restricting carbapenems to confirmed ESBL infections preserves these last-resort agents and reduces selection pressure that drives carbapenem-resistant organism emergence.
Question 6: Which of the following is a core element of hospital antimicrobial stewardship programs according to CDC?
- Mandatory antibiotic formulary elimination every 2 years
- Leadership commitment with dedicated human, financial, and IT resources (Correct answer)
- Limiting infectious disease consults to ICU patients only
- Requiring all antibiotic orders to be reviewed by administration
Correct answer: Leadership commitment with dedicated human, financial, and IT resources
CDC identifies leadership commitment with dedicated resources as a foundational element, as sustainable stewardship requires institutional support, not just individual efforts.
Question 7: Pharmacokinetic/pharmacodynamic (PK/PD) optimization in stewardship refers to:
- Using the lowest antibiotic dose to minimize side effects
- Tailoring dosing regimens to maximize pathogen killing while minimizing toxicity (Correct answer)
- Choosing antibiotics based solely on cost
- Extending dosing intervals beyond standard recommendations
Correct answer: Tailoring dosing regimens to maximize pathogen killing while minimizing toxicity
PK/PD optimization applies principles like time-dependent vs. concentration-dependent killing to design regimens that maximize efficacy against the target pathogen while limiting adverse effects.
CIC Antimicrobial Stewardship 3
Which antibiotic class is most strongly associated with the development of Clostridioides difficile infection (CDI)?