Positive Bactec resin cultures do not influence antimicrobial selection.

Area of Science:

• Clinical Microbiology
• Infectious Diseases
• Pharmacology

Background:

• Blood cultures are crucial for diagnosing bloodstream infections and guiding antimicrobial therapy.
• Bactec resin blood culture systems are used to detect microorganisms in patient blood samples.
• The clinical impact of positive resin blood cultures on antimicrobial selection requires evaluation.

Purpose of the Study:

• To retrospectively evaluate the impact of positive Bactec resin blood cultures on the selection of antimicrobial therapy.
• To determine if positive results from resin blood cultures led to changes in antibiotic treatment regimens.

Main Methods:

• Retrospective analysis of 2919 Bactec resin blood cultures submitted in 1987.
• Identification and assessment of 151 positive cultures and 161 isolates.
• Clinical data review to determine significance, contamination, and impact on therapy.

Main Results:

• Of 151 positive cultures, 44 (53 isolates) were contaminants.
• 82 clinically significant cultures were monomicrobial.
• In 18 patients with susceptible isolates, positive cultures did not alter antimicrobial therapy choice.
• Only one patient experienced an increased antibiotic dosage.

Conclusions:

• Positive Bactec resin blood cultures demonstrated minimal impact on antimicrobial selection in this study.
• The routine use of Bactec resin blood cultures may not be consistently justified based on their limited influence on therapy.
• Further research may be needed to define the specific clinical scenarios where resin blood cultures offer significant advantages.