Vegetation (pathology)

Pathological growths on heart valves

Vegetation in pathology refers to an abnormal growth of tissue, often associated with infective endocarditis. These growths are typically found on the heart valves and are composed of a mixture of fibrin, platelets, and microorganisms.

Formation

Vegetations form as a result of the body's response to infection. When bacteria or other pathogens enter the bloodstream, they can adhere to the heart valves, particularly if the valves are already damaged or abnormal. The immune system responds by depositing fibrin and platelets at the site of infection, leading to the formation of vegetations. These growths can vary in size and may be friable, meaning they can easily break off and cause embolisms.

Clinical significance

Vegetations are a hallmark of bacterial endocarditis, a serious infection of the heart valves. The presence of vegetations can lead to complications such as valve destruction, heart failure, and systemic emboli. Diagnosis is often made using echocardiography, which can visualize the vegetations on the heart valves.

Histopathology

The histopathological examination of vegetations reveals a complex structure. The outer layer is composed of fibrin and platelets, while the inner core contains colonies of bacteria. The image "Histopathology_of_vegetation_of_bacterial_endocarditis.jpg" shows a typical histological section of a vegetation, highlighting the bacterial colonies and the surrounding fibrin network.

Treatment

The primary treatment for vegetations associated with infective endocarditis is prolonged antibiotic therapy. In some cases, surgical intervention may be necessary to repair or replace damaged heart valves. Early diagnosis and treatment are crucial to prevent serious complications.

Related pages

• Endocarditis
• Heart valve disease
• Embolism

References

• Li, J. S., Sexton, D. J., Mick, N., Nettles, R., Fowler, V. G., Ryan, T., ... & Corey, G. R. (2000). Proposed modifications to the Duke criteria for the diagnosis of infective endocarditis. Clinical Infectious Diseases, 30(4), 633-638.
• Habib, G., Lancellotti, P., Antunes, M. J., Bongiorni, M. G., Casalta, J. P., Del Zotti, F., ... & Zamorano, J. L. (2015). 2015 ESC Guidelines for the management of infective endocarditis. European Heart Journal, 36(44), 3075-3128.

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  Histopathology of vegetation of bacterial endocarditis