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Role of Bartonella henselae endocarditis in the nucleation of aortic valvular calcification

John J Ghidoni1

  • 1Department of Pathology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, USA. ghidoni@uthscsa.edu

The Annals of Thoracic Surgery
|February 5, 2004
PubMed

Insights

This case study highlights Bartonella henselae endocarditis in a child, demonstrating how calcified bacteria can integrate into cardiac scar tissue. Early diagnosis and surgical intervention are crucial for managing this rare condition.

Area of Science:

  • Cardiology
  • Infectious Diseases
  • Pathology

Background:

  • Bartonella henselae is a known cause of endocarditis, particularly in immunocompromised individuals.
  • Bicuspid aortic valves are a risk factor for infective endocarditis.
  • Pediatric endocarditis is relatively rare, making case studies essential for understanding disease patterns.

Observation:

  • A 6-year-old boy presented with symptoms of heart failure, including fatigability, shortness of breath, and bulging neck veins.
  • Echocardiography revealed significant findings: large vegetations, aortic insufficiency, a dilated left ventricle, and a bicuspid aortic valve.
  • Despite negative blood cultures, positive antibodies for Bartonella henselae and subsequent Warthin-Starry staining confirmed the diagnosis.

Findings:

  • Microscopic examination revealed coccobacilli consistent with Bartonella henselae within thickened native valve tissue.
  • Bacterial membranes contained calcium apatite crystals, and antigenic material was observed in bacteria and calcified nodules.
  • The study illustrates the incorporation of calcified protobacteria into scar tissue during the endocarditis process.

Implications:

  • This case emphasizes the importance of considering Bartonella henselae in pediatric endocarditis, even without typical risk factors.
  • The findings suggest a potential mechanism involving calcification of bacteria within valvular tissue.
  • Prompt diagnosis and treatment, including surgical intervention like the Ross procedure, are vital for favorable outcomes in pediatric endocarditis.

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