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  • Title: Infective endocarditis due to multidrug resistant gram-negative bacilli: single centre experience over 5 years.
    Author: Durante-Mangoni E, Andini R, Agrusta F, Iossa D, Mattucci I, Bernardo M, Utili R.
    Journal: Eur J Intern Med; 2014 Sep; 25(7):657-61. PubMed ID: 24954705.
    Abstract:
    BACKGROUND: Infective endocarditis (IE) due to gram-negative (GN) bacilli is uncommon. Although multi- and extensively-drug resistant (MDR/XDR) GN infections are emerging, very few data are available on IE due to these microrganisms. METHODS: In this study, we describe the clinical characteristics, course and outcome of five contemporary, definite, MDR/XDR GNIE cases seen at our centre. RESULTS: All patients had been admitted to a hospital during the 6months before IE onset, 2 were on hemodialysis and 3 on intravenous medications. Three of the 5 cases were hospital-acquired. Intracardiac prosthetic devices were present in all cases (3 central venous lines, 2 prosthetic heart valves, 2 pacemakers). Mean Charlson comorbidity index was 5.8. Causative pathogens were XDR Pseudomonas aeruginosa (2 cases), XDR Acinetobacter baumannii, MDR Burkolderia cepacia and MDR Escherichia coli (1 case each). Concomitant pathogens with a MDR/XDR phenotype were isolated in 4 patients. Both valves and intracardiac devices and left and right sides of the heart were involved. The rate of complications was high. Antibiotic treatment hinged on the use of colistin, a carbapenem or both. Cardiovascular surgical procedures were performed in 3 patients. Despite aggressive therapeutic regimens, outcomes were poor. Clearance of bacteremia was obtained in 3 patients, in-hospital death occurred in 3 patients, only 1 patient survived during follow up. CONCLUSIONS: MDR/XDR GN are emerging as a cause of IE in carriers of intracardiac prostheses with extensive healthcare contacts and multiple comorbidities. Resistant GNIE has a complicated course and shows a dismal prognosis.
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