Related Experiment Videos
Four-valve polymicrobial endocarditis caused by Pseudomonas aeruginosa and Serratia marcescens
Abstract:
This report describes what is believed to be the first case of mixed Pseudomonas and Serratia endocarditis, of probable nosocomial etiology, with involvement of all four heart valves in a 56 year old nonaddicted patient. Although both organisms were recovered in culture, infection and tissue invasion were documented by light and electron microscopy. The clinical course in this patient differed from more typical patterns of Pseudomonas or Serratia endocarditis that have been observed as complications of narcotic addiction or compromised cardiac status. Our patient had the rare occurrence of endocarditis with two organisms and four-valve involvement. Clinically, however, this presented as a right-sided endocarditis and behaved as though only a single organism were present.
Insights
This case report details the first instance of mixed Pseudomonas and Serratia endocarditis affecting all four heart valves in a nonaddicted patient. The infection, likely hospital-acquired, presented clinically as right-sided endocarditis.
Area of Science:
- Infectious Diseases
- Cardiology
- Microbiology
Background:
- Endocarditis is an infection of the heart lining or valves.
- Mixed bacterial infections are rare but serious causes of endocarditis.
- Pseudomonas and Serratia are opportunistic pathogens that can cause severe infections.
Observation:
- A 56-year-old nonaddicted patient developed endocarditis involving all four heart valves.
- Cultures identified both Pseudomonas and Serratia species.
- Light and electron microscopy confirmed tissue invasion by both organisms.
Findings:
- This is the first reported case of mixed Pseudomonas and Serratia endocarditis with four-valve involvement.
- The probable cause was nosocomial (hospital-acquired) infection.
- Clinical presentation mimicked right-sided endocarditis, despite multi-valve and multi-organism involvement.
Implications:
- Highlights the potential for rare, severe endocarditis in non-traditional patient populations.
- Emphasizes the importance of considering polymicrobial infections in complex cases.
- Suggests that clinical presentation may not always reflect the full extent of valvular or microbial involvement.