alexa Non-HACEK gram-negative bacillus endocarditis.
Microbiology

Microbiology

Journal of Microbial & Biochemical Technology

Author(s): Morpeth S, Murdoch D, Cabell CH, Karchmer AW, Pappas P,

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Abstract BACKGROUND: Infective endocarditis caused by non-HACEK (species other than Haemophilus species, Actinobacillus actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, or Kingella species) gram-negative bacilli is rare, is poorly characterized, and is commonly considered to be primarily a disease of injection drug users. OBJECTIVE: To describe the clinical characteristics and outcomes of patients with non-HACEK gram-negative bacillus endocarditis in a large, international, contemporary cohort of patients. DESIGN: Observations from the International Collaboration on Infective Endocarditis Prospective Cohort Study (ICE-PCS) database. SETTING: 61 hospitals in 28 countries. PATIENTS: Hospitalized patients with definite endocarditis. MEASUREMENTS: Characteristics of non-HACEK gram-negative bacillus endocarditis cases were described and compared with those due to other pathogens. RESULTS: Among the 2761 case-patients with definite endocarditis enrolled in ICE-PCS, 49 (1.8\%) had endocarditis (20 native valve, 29 prosthetic valve or device) due to non-HACEK, gram-negative bacilli. Escherichia coli (14 patients [29\%]) and Pseudomonas aeruginosa (11 patients [22\%]) were the most common pathogens. Most patients (57\%) with non-HACEK gram-negative bacillus endocarditis had health care-associated infection, whereas injection drug use was rare (4\%). Implanted endovascular devices were frequently associated with non-HACEK gram-negative bacillus endocarditis compared with other causes of endocarditis (29\% vs. 11\%; P < 0.001). The in-hospital mortality rate of patients with endocarditis due to non-HACEK gram-negative bacilli was high (24\%) despite high rates of cardiac surgery (51\%). LIMITATIONS: Because of the small number of patients with non-HACEK gram-negative bacillus endocarditis in each treatment group and the lack of long-term follow-up, strong treatment recommendations are difficult to make. CONCLUSION: In this large, prospective, multinational cohort, more than one half of all cases of non-HACEK gram-negative bacillus endocarditis were associated with health care contact. Non-HACEK gram-negative bacillus endocarditis is not primarily a disease of injection drug users.
This article was published in Ann Intern Med and referenced in Journal of Microbial & Biochemical Technology

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