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Prosthetic valve endocarditis caused by Histoplasma capsulatum
Abstract:
Previously reported cases of Histoplasma capsulatum infection of prosthetic heart valves have been first diagnosed at autopsy. A patient had an H capsulatum infection that was diagnosed by serologic means 1 1/2 years before involvement of the patient's prosthetic mitral valve was found at surgery. Numerous previous attempts to demonstrate organisms by culture and histologic study of bone marrow and liver biopsy specimens were unsuccessful. Various serologic tests were used in the diagnosis and evaluation of treatment of H capsulatum endocarditis. The management of this case was compared with 29 other previously reported cases of endocarditis caused by H capsulatum.
Insights
This study highlights a case of Histoplasma capsulatum infection in a prosthetic mitral valve, diagnosed via serology years before surgical detection. Early serologic diagnosis aids in managing this rare fungal endocarditis.
Area of Science:
- Mycology
- Infectious Diseases
- Cardiology
Background:
- Histoplasma capsulatum (H. capsulatum) fungal infections can affect prosthetic heart valves.
- Diagnosis of H. capsulatum endocarditis is often delayed, with many cases first identified post-mortem.
Observation:
- A patient with H. capsulatum infection was diagnosed using serologic tests 1.5 years prior to prosthetic mitral valve involvement being confirmed during surgery.
- Initial attempts to detect H. capsulatum through cultures and biopsies of bone marrow and liver were negative.
Findings:
- Serologic tests proved crucial for diagnosing H. capsulatum endocarditis and monitoring treatment effectiveness in this patient.
- The management of this case was compared to 29 previously documented instances of H. capsulatum endocarditis.
Implications:
- This case underscores the utility of serologic testing for early diagnosis of H. capsulatum prosthetic valve endocarditis.
- Timely serologic diagnosis can facilitate earlier intervention and potentially improve outcomes for patients with fungal endocarditis.