Clinical outcomes of carbapenem de-escalation regardless of microbiological results: A propensity score analysis.

OBJECTIVE: The aim of this study was to evaluate the safety and efficacy of de-escalation in patients under treatment with carbapenems and its impact on clinical outcomes. METHODS: A prospective observational study was conducted for 1year. Patients administered active carbapenems for at least 24h were included. Primary outcomes were in-hospital mortality, mortality at 30 days after carbapenem prescription, and infection-related readmission within 30 days. De-escalation was defined as the substitution of carbapenem with narrower spectrum antimicrobial agents or its discontinuation during the first 96h of treatment. RESULTS: The study included 1161 patients, and de-escalation was performed in 667 (57.5%) of these. In the de-escalation group, 54.9% of cultures were positive. After propensity score matching, 30-day mortality was lower (17.4% vs. 25.7%, p=0.036), carbapenem treatment was 4 days shorter (4 vs. 8 days, p<0.001), total antibiotic therapy duration was 2 days longer (12 vs. 10 days, p=0.003), and length of hospital stay was 5 days shorter (8 vs. 13 days, p=0.008) in the de-escalated versus non-de-escalated patients. In-hospital mortality and 30-day readmission rates did not differ significantly between these groups. CONCLUSION: Carbapenem de-escalation is a safe strategy that does not compromise the clinical status of patients.