Prosthetic valve endocarditis due to Mycobacterium chelonei

Area of Science:

• Infectious Diseases
• Microbiology
• Cardiovascular Surgery

Background:

• Prosthetic heart valves, such as the Starr-Edwards model, are susceptible to infectious complications.
• Endocarditis, an infection of the heart lining or valves, can be life-threatening, especially with prosthetic devices.
• Mycobacterium chelonae is an atypical mycobacterium known to cause opportunistic infections.

Observation:

• Starr-Edwards mitral and aortic prosthetic valves were identified as the origin (nidi) of endocarditis.
• The causative agent was isolated from patients with prosthetic valve endocarditis.
• Clinical presentations suggested an infectious etiology linked to the prosthetic valves.

Findings:

• Microbiological cultures and biochemical analyses identified the pathogen as Mycobacterium chelonae.
• Physiological and lipid chromatographic studies further characterized the isolate, confirming it as M. chelonae (abscessus).
• Serological tests supported the identification and potential host response to the infection.

Implications:

• This highlights a specific risk associated with Starr-Edwards prosthetic valves and Mycobacterium chelonae infections.
• Accurate identification of M. chelonae is crucial for appropriate treatment of prosthetic valve endocarditis.
• Understanding this association can inform surgical practices and patient monitoring for prosthetic valve infections.