Trends in antifungal use among hospitalized patients in the USA, 2018-23

Fungal infections cause substantial morbidity and mortality. Monitoring antifungal use is a foundational aspect of antifungal stewardship, particularly as new disease-causing fungi emerge and antifungal resistance spreads. We assessed recent patterns in systemic antifungal medication use among hospitalized patients within a diverse convenience sample of academic medical centres and community hospitals in the USA.

We conducted a multicentre retrospective cohort study using the Vizient® Clinical Data Base. We selected hospitalized patients who received ≥1 dose of systemic antifungal medication during 2018-23 and assessed antifungal days of therapy (DOT) per 1000 patient days. We stratified antifungal DOT by National Comprehensive Cancer Network (NCCN) cancer centre status to compare antifungal use at hospitals with an NCCN-designated cancer centre-some of which also include a main academic medical centre and non-cancer service lines-versus hospitals without an NCCN-designated cancer centre.

Among 39 956 873 discharges from 412 hospitals, the proportion of patients who received any systemic antifungal was 4.5%; azoles (3.8%) were the most common antifungal class, followed by echinocandins (0.9%). Overall antifungal DOT were 53.7 per 1000 patient days (114.5 among 25 NCCN hospitals and 43.2 among 387 non-NCCN hospitals).

Substantial antifungal use occurs among hospitalized patients, particularly among those with cancer. The growing population susceptible to fungal infections (e.g. transplants, cancer and other immunosuppressing conditions) warrants consideration of antifungal stewardship and evaluation of appropriateness of antifungal use in the context of increasing resistance.