Objective:
To analyze the relationship between elevated procalcitonin (PCT) levels and the duration of antibiotic therapy in patients with bloodstream infections.
Approach:
- Study Design: A planned cohort analysis within the BALANCE trial, comparing 7 vs 14 days of antibiotic therapy among hospitalized patients.
- Patient Population: Included 125 patients from 12 Canadian centers, with serum collected on day 7 of treatment.
- PCT Measurement: PCT levels were quantified using an antibody-based assay, with results not disclosed to clinicians during the trial.
Key Findings:
- 90-day mortality was 22% in patients with high PCT levels (≥250 pg/mL) compared to 6% in those with lower levels.
- Patients in the high-PCT group had higher baseline Sequential Organ Failure Assessment scores and were more likely to have diabetes, dialysis dependency, and community-onset bloodstream infections.
- No significant differences in ICU mortality, ICU-free days, hospital-free days, or adherence to treatment duration between high and low-PCT groups.
- Randomization to longer antibiotic courses did not improve 90-day mortality or secondary outcomes.
- In a sensitivity analysis defining high PCT as greater than 500 pg/mL, no difference in 90-day mortality was observed between treatment-duration groups.
Interpretation:
Elevated PCT levels may not be a reliable indicator for extending antibiotic therapy duration, as they could be influenced by host factors such as immune dysregulation and comorbidities.
Limitations:
- Small sample size of 125 patients limits statistical power.
- Findings may not be generalizable to the broader BALANCE population or other countries.
- PCT was measured only once, limiting the assessment of changes over time.
- Exclusion of bloodstream infections caused by Staphylococcus aureus and Staphylococcus lugdunensis affects generalizability.
Conclusion:
A fixed 7-day course of antibiotics appears sufficient for most patients, and PCT measurement is not necessary for discontinuing therapy at 7 days for the majority of patients.
Sources:
This content is an AI-generated, fully rewritten summary based on a published scholarly article. It does not reproduce the original text and is not a substitute for the original publication. Readers are encouraged to consult the source for full context, data, and methodology.
