Epidemiology and Microbiology of First Ventricular Assist Device Infection and Their Effect on Outcomes

Abstract

BackgroundLeft ventricular assist devices (VADs) are life-saving for patients with end stage heart failure but their benefits are limited due to infectious complications. Large studies looking at the site of infection and microbiology on outcomes are not available.MethodsWe conducted a single center retrospective cohort study of patients who underwent VAD implantation from 2009 to 2015. VAD infections were defined according to the criteria by the International Society for Heart and Lung Transplantation (ISHLT). Only the first VAD infection was included. Patients were followed until transplant, death or end of study. Descriptive statistics were performed. Time to event data was analyzed using Kaplan Meier and Cox Proportional Hazards.ResultsA total of 451 patients had a VAD placed during the study period. Median duration of follow up was 293 days (IQR-503) in patients without infection and 585 days (IQR 577) in those with VAD infection. 175 patients (38.8%) had at least 1 VAD infection, 29.1% involved the endovascular space and 70.9% involved local VAD infection. Median survival time was 1,430 days with local infection, 592 days with endovascular infection and 661 days in patients without infection (P < 0.001, Figure). The most common endovascular infection involved the pump/cannula (52.9%) and the most common local infection involved the superficial driveline (61.3%). Of the infections with a single identifiable organism, 74.5% were Gram-positives, 19.6 % were Gram-negatives and 5.2% were candida species. The predominant microorganisms were Staphylococcus aureus (35.9%), S. epidermidis (8.5%), Pseudomonas aeruginosa (7.8%) and Enterococcus faecalis (6.5%). There was no difference in mortality when Gram-positive, Gram-negative and Candida infections were compared.ConclusionPatients who survive the early post-VAD period frequently develop infectious complications. Patients with endovascular infections had significantly decreased survival compared with those with local infection. Further studies to develop strategies for prevention of VAD infections are needed.Disclosures M. Olsen, Pfizer: Consultant, Grant Investigator and Scientific Advisor, Consulting fee and Research grant; sanofi pasteur: Grant Investigator, Research grant