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Systemic sarcoidosis and electrocardiographic conduction abnormalities. Electrophysiologic evaluation of two patients
Insights
Sarcoidosis can cause severe heart block and bradycardia due to trifascicular conduction system involvement. This progression can occur even without significant left ventricular dysfunction, highlighting risks in sarcoidosis patients.
Area of Science:
- Cardiology
- Immunology
- Pathology
Background:
- Sarcoidosis is an inflammatory disease that can affect multiple organs, including the heart.
- Cardiac sarcoidosis poses a risk for arrhythmias and sudden cardiac death.
Observation:
- Two patients with a history of sarcoidosis presented with progressive conduction abnormalities.
- These abnormalities advanced to complete heart block and severe bradycardia.
Findings:
- Both patients exhibited trifascicular involvement of the cardiac conduction system.
- Despite conduction abnormalities, significant left ventricular functional impairment was absent in both cases.
Implications:
- Cardiac sarcoidosis can lead to severe bradyarrhythmias through localized conduction system disease.
- This contrasts with sudden death in sarcoidosis, which is more often associated with diffuse myocardial infiltration.
Abstract:
Two patients with long histories of sarcoidosis had progression of conduction abnormalities to heart block and severe bradycardia. Conduction system involvement was trifascicular in both patients, though evidence for left ventricular functional impairment was otherwise lacking. Sudden death is seen more commonly in patients with sarcoidosis who have diffuse myocardial involvement, while conduction abnormalities can occur with relatively localized disease.