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Development and Application of an Anaerobic Activity Index
Natalie A Mackow1,2,3, Lauren Komarow4, Sonia Napravnik3
1Division of Infectious Diseases, Department of Medicine, Renaissance School of Medicine at Stony Brook University, Stony Brook, New York, USA.
Summary
A new Anaerobic Activity Index (AAI) quantifies antibiotic exposure against anaerobic bacteria. Higher AAI scores in burn patients were linked to worse outcomes, suggesting AAI
Area of Science:
- Pharmacology
- Infectious Diseases
- Clinical Research
Background:
- Antibiotics with anaerobic activity can lead to adverse patient outcomes.
- Quantifying anti-anaerobic antibiotic exposure is crucial for patient safety.
- The Anaerobic Activity Index (AAI) was developed to address this need.
Purpose of the Study:
- To develop and apply a quantitative index for assessing antibiotic activity against anaerobic bacteria.
- To evaluate the association between anaerobic antibiotic exposure and patient outcomes in a burn cohort.
Main Methods:
- Generated a numeric AAI for 21 antibiotics using in vitro susceptibility data against seven anaerobic bacterial groups.
- Calculated 7-day anaerobic exposure in a cohort of burn patients.
- Used multivariable logistic regression to assess the link between AAI quartiles and a 90-day composite outcome.
Main Results:
- The AAI ranged from 4 to 59, with meropenem, ertapenem, and tigecycline scoring highest.
- The highest 7-day AAI quartile in burn patients was associated with increased odds of the composite outcome (OR: 2.90).
- Data limitations prevented the inclusion of several antibiotics in the AAI calculation.
Conclusions:
- The proposed Anaerobic Activity Index (AAI) provides a quantitative measure for anti-anaerobic antibiotic exposure.
- The AAI can serve as a research tool to evaluate the impact of anaerobic antibiotic use on patient outcomes.
- The AAI is expected to be updated as new susceptibility data become available.
