Abstract
Antibiotics are frequently utilized for cystic fibrosis (CF)-related pulmonary exacerbation treatment. The antibiotic spectrum index (ASI) is an antimicrobial stewardship tool developed to compare the relative breadth of individual antibiotics. This study aimed to create two expanded CF-specific ASI scoring indices for use in antimicrobial stewardship research and clinical care. The first scoring index expanded the original ASI to include bacterial microorganisms common to CF airway infections (CF-ASI). The second scoring system only included scores for bacterial microorganisms classically identified in CF airway infections (CF-sASI). Sixty-two antibiotics were evaluated and included in the updated ASIs. When multiple antibiotics are prescribed, we proposed using an additive ASI approach whereby the sum of the individual prescribed antibiotic scores represents the total ASI score. The application of CF-focused ASIs into CF research and stewardship programs can help to optimize antibiotic benefits, minimize harms and allow for increased sustainability of antibiotic use in CF.
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