Granulicatella elegans endocarditis: a diagnostic and therapeutic challenge

Area of Science:

• Infectious Diseases
• Cardiology
• Microbiology

Background:

• Non-ischaemic cardiomyopathy can predispose patients to severe cardiac events.
• Infective endocarditis (IE) is a serious infection of the heart valves.
• Granulicatella elegans, a rare bacterium, is increasingly recognized as a cause of IE.

Observation:

• A 63-year-old man with cardiomyopathy presented with worsening heart failure and septic shock.
• Echocardiogram showed a large aortic valve vegetation and severe aortic incompetence.
• Blood cultures identified Granulicatella elegans, but antimicrobial sensitivities could not be determined.

Findings:

• IE caused by Granulicatella elegans (previously nutrient-variant streptococci) is associated with a poor prognosis and high mortality.
• Challenges in treating G. elegans IE include difficulties in bacterial isolation, in vitro antibiotic susceptibility testing, and frequent treatment failures.
• Multivalvular involvement is a potential complication of G. elegans IE.

Implications:

• Early detection and appropriate antibiotic therapy are crucial for managing G. elegans IE.
• Early surgical intervention may be necessary for successful treatment.
• This case underscores the need for increased awareness and improved diagnostic and therapeutic strategies for rare causes of IE.