[Acute endocarditis of the native aortic valve caused by Propionibacterium acnes]

Area of Science:

• Infectious Diseases
• Cardiology
• Microbiology

Background:

• Propionibacterium acnes (P. acnes) is increasingly recognized as a significant pathogen in serious infections, moving beyond its historical perception as a contaminant.
• While rare, P. acnes can cause infective endocarditis, a serious infection of the heart valves.
• Virulent bacteria, particularly those associated with foreign bodies, are implicated in severe conditions like aortic root abscesses.

Observation:

• A case of infective endocarditis involving a native aortic valve caused by P. acnes is presented.
• This P. acnes endocarditis was notably associated with an aortic root abscess, a severe complication.
• Transesophageal echocardiography proved crucial in diagnosing this complex cardiac infection.

Findings:

• Propionibacterium acnes can be the primary causative agent in infective endocarditis, even on native valves.
• The presence of an aortic root abscess signifies a particularly virulent presentation of P. acnes infection.
• Foreign bodies represent a significant risk factor for invasive P. acnes infections.

Implications:

• This case underscores the importance of considering P. acnes in the differential diagnosis of infective endocarditis, especially with risk factors like foreign bodies or abscess formation.
• Accurate and timely diagnosis, aided by advanced imaging like transesophageal echocardiography, is critical for managing severe P. acnes endocarditis.
• Further research into the virulence factors and optimal treatment strategies for P. acnes endocarditis is warranted.