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Related Experiment Video

Updated: Jan 26, 2026

Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
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Non-HACEK Gram-negative bacillus endocarditis.

M Ertugrul Mercan1, F Arslan2, S Ozyavuz Alp3

  • 1Department of Cardiology, Faculty of Medicine, Istanbul Acibadem University, Istanbul, Turkey.

Medecine Et Maladies Infectieuses
|April 4, 2019
PubMed
Summary
This summary is machine-generated.

This study analyzed 26 non-HACEK Gram-negative infective endocarditis cases in Turkey. Pseudomonas aeruginosa and Escherichia coli were common pathogens, with a 23% case fatality rate observed.

Keywords:
Bactéries à Gram négatifCatheterizationCathétérismeEndocarditeEndocarditisGram-negative bacteria

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Area of Science:

  • Infectious Diseases
  • Cardiology
  • Microbiology

Background:

  • Infective endocarditis (IE) is a serious infection affecting heart valves.
  • Non-HACEK Gram-negative bacteria are increasingly recognized causes of IE.
  • Understanding risk factors and outcomes for non-HACEK IE is crucial for patient management.

Purpose of the Study:

  • To investigate the clinical characteristics, pathogens, and outcomes of non-HACEK Gram-negative infective endocarditis.
  • To identify predisposing factors and common causative agents in this patient population.

Main Methods:

  • Retrospective analysis of clinical data from 26 patients diagnosed with non-HACEK Gram-negative IE.
  • Data collected from nine hospitals in Turkey.
  • Review of patient demographics, predisposing factors, pathogens, treatment, and outcomes.

Main Results:

  • The mean patient age was 53 years, with a 23% case fatality rate.
  • Predisposing factors were present in 73% of patients, most commonly central venous catheter use.
  • Pseudomonas aeruginosa and Escherichia coli were the most frequent pathogens identified.
  • Median antibiotic therapy duration was 42 days; surgery was performed in 10 patients with similar fatality rates.

Conclusions:

  • Non-HACEK Gram-negative bacteria pose a significant threat in infective endocarditis, particularly in patients with predisposing factors like central venous catheters.
  • Effective antibiotic therapy and judicious use of surgery are key in managing these infections.
  • Further research is needed to optimize treatment strategies and reduce mortality in non-HACEK IE.