High incidence of bloodstream infection due to gram-negative bacilli in patients with pulmonary hypertension receiving intravenous treprostinil.

INTRODUCTION An excessive risk for bacteremia has recently been reported in patients with pulmonary arterial hypertension (PAH) treated with intravenous treprostinil. We aimed to assess this association in a cohort of patients from a Spanish referral center. PATIENTS AND METHODS We performed a retrospective cohort study that included 55 patients diagnosed with PAH who received a continuous intravenous infusion of a prostanoid (epoprostenol or treprostinil) for ≥1month at our center between January 1991 and December 2011. The risk factors associated with the incidence of bacteremia were analyzed with the log-rank test. RESULTS After a total follow-up of 64,453 treatment days, we found 12 episodes of bacteremia: Staphylococcus aureus (5 episodes), non-fermenting gram-negative bacilli (4 episodes), other gram-positive cocci (2 episodes), and Enterobacter cloacae (one episode). The incidence of bacteremia was 0.118 episodes per 1,000 treatment days in patients receiving epoprostenol versus 0.938 episodes per 1,000 treatment-days in patients receiving treprostinil (P=.0037). All episodes of bacteremia due to Gram-negative bacilli were diagnosed in patients on treprostinil. In the univariate analysis the treatment with intravenous treprostinil was associated with the incidence of bacteremia (hazard ratio: 4.09; 95% confidence interval: 1.24-14.53), although the low number of events prevented us from performing a multivariate analysis. CONCLUSIONS Therapy with intravenous treprostinil is associated with a higher risk for bacteremia, especially due to non-fermenting Gram-negative bacilli. This association should be taken in consideration when choosing empirical antibiotic therapy for patients with PAH and sepsis.