Patterns of Amphotericin B Use and Factors Related to Mortality in a Low-Middle Income Country: An Observational and Longitudinal Study.

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Background/Objectives: Amphotericin B is indicated in deep systemic fungal infections. The aim was to determine the sociodemographic, clinical and pharmacological variables of a group of Colombian patients treated with amphotericin B and factors associated with mo rtality. Methods: A longitudinal observational retrospective study on the use of amphotericin B in Colombia was conducted between January 2015 and December 2022. The multivariate analysis sought to identify variables related to mortality. Results: A total of 310 patients were identified, with a median age of 44.0 years, and 71.0% were women. Conventional amphotericin B was the most used (74.8%). The main uses were cryptococcosis (38.7%), histoplasmosis (31.9%) and candidiasis (29.4%). More than a third of patients died during hospitalization (40.3%). An increase in the Charlson Comorbidity Index score (HR: 1.13; 95% CI: 1.05-1.22) and in the qSOFA score (HR: 1.34; 95% CI: 1.04-1.73), coinfection by Mycobacterium tuberculosis (HR: 2.09; 95% CI: 1.32-3.31) and the requirement of vasopressors (HR: 4.20; 95% CI: 2.16-8.15) or invasive mechanical ventilation (HR: 2.73; 95% CI: 1.40-5.33) increased the probability of in-hospital death. In contrast, those who received systemic corticosteroids (HR: 0.43; 95% CI: 0.26-0.70) had a lower risk. Conventional amphotericin B is the most used drug mainly treating Cryptococcus neoformans infections. Conclusions: The use of amphotericin B was consistent with clinical practice guideline recommendations. In-hospital mortality was common, and factors such as increased comorbidities, higher qSOFA scores, coinfection with Mycobacterium tuberculosis and invasive procedures like mechanical ventilation were linked to increased mortality.