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Published on: August 26, 2025
Management of Gram-negative and fungal endocarditis
Emanuele Durante-Mangoni1, Marie-Françoise Tripodi, Rosina Albisinni
1University of Naples SUN, Monaldi Hospital, Napoli, Italy.
Abstract:
Infective endocarditis is infrequently caused by Gram-negative bacteria or fungi. Gram-negative organisms are responsible for <4% of cases, whilst fungal endocarditis accounts for <1.5% of culture-positive cases worldwide. Endocarditis due to Gram-negative organisms or fungi is a rare but severe disease. It often has a nosocomial origin, is caused by virulent and often resistant organisms and presents a high rate of complications and high mortality. In this article we present the most recent literature data and address the current management of Gram-negative and fungal infective endocarditis. We also discuss the major challenges of antimicrobial treatment and discuss some issues related to surgical decision-making in difficult-to-manage cases. We finally present our centre's experience with Gram-negative infective endocarditis, with a special focus on the demanding issues that the management of these complex and severely ill patients raise.
Insights
Gram-negative bacteria and fungi rarely cause infective endocarditis but lead to severe disease with high mortality. Management involves complex antimicrobial and surgical decisions for these rare, resistant infections.
Area of Science:
- Infectious Diseases
- Cardiology
- Microbiology
Background:
- Infective endocarditis (IE) is typically caused by Gram-positive bacteria.
- Gram-negative bacteria (<4%) and fungi (<1.5%) are rare causes of IE.
- These rare IE cases are severe, often nosocomial, and associated with high mortality.
Purpose of the Study:
- To review recent literature on Gram-negative and fungal IE.
- To discuss current management strategies, including antimicrobial and surgical approaches.
- To present institutional experience with Gram-negative IE.
Main Methods:
- Literature review of recent data on Gram-negative and fungal IE.
- Analysis of challenges in antimicrobial therapy.
- Discussion of surgical decision-making in complex cases.
- Presentation of single-center experience.
Main Results:
- Gram-negative and fungal IE are severe, rare infections with high complication and mortality rates.
- Antimicrobial resistance and treatment challenges are significant.
- Surgical intervention is often complex and debated.
Conclusions:
- Management of Gram-negative and fungal IE requires tailored, multidisciplinary approaches.
- Addressing antimicrobial resistance and optimizing surgical timing are critical.
- Further research and standardized guidelines are needed for these challenging cases.
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