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Complete heart block due to granulomatous giant cell myocarditis: report of 3 cases
Insights
Granulomatous giant cell myocarditis (GGCM) is a rare cause of complete atrioventricular block. Echocardiography may help screen for this condition in patients with AV block, particularly those with immune disorders.
Area of Science:
- Cardiology
- Pathology
- Immunology
Background:
- Chronic complete atrioventricular block (AV block) can have various underlying causes.
- Granulomatous giant cell myocarditis (GGCM) is a rare inflammatory condition affecting the heart muscle.
Observation:
- Autopsy findings in 3 patients revealed GGCM as the cause of chronic complete AV block.
- One patient presented with an unusual clinical course, prompting further investigation.
Findings:
- Echocardiography identified ventricular septal abnormalities in the patient with the unusual clinical course.
- A literature review was conducted to contextualize these findings.
- GGCM is identified as a rare but significant cause of AV block.
Implications:
- Echocardiography may serve as a valuable non-invasive screening tool for GGCM in patients presenting with AV block.
- Early detection is crucial, especially in individuals with co-existing immunological disorders.
- Further research into the diagnostic utility of echocardiography for GGCM is warranted.
Abstract:
3 patients with chronic complete AV block were found at autopsy to have granulomatous giant cell myocarditis (GGCM). In 1 patient an unusual clinical course led to more extensive investigation including echocardiography which revealed ventricular septal abnormalities. A review of the literature is presented. Although GGCM is a rare disease echocardiography may be a useful screening procedure in patient with AV block especially in the presence of immunological disorders.