ArticleEuropean heart journal. Case reports2025
Complete heart block as the first manifestation of systemic sarcoidosis: a case report highlighting the diagnostic utility of multimodality imaging.
Article in European heart journal. Case reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Sarcoidosis is a systemic inflammatory disease of unknown aetiology characterized by the formation of non-caseating granulomas. Cardiac involvement occurs in up to 30% of cases but only manifests clinically in 5%. In young patients presenting with high-grade atrioventricular block, infiltrative processes such as sarcoidosis should be considered in the differential diagnosis. Case summary: We present the case of a 35-year-old male who presented to hospital with symptomatic complete heart block as the first manifestation of multi-system sarcoidosis with cardiac involvement. Initial blood testing, chest x-ray and transthoracic echocardiography were unremarkable, leaving a broad differential to be considered. Cardiac magnetic resonance imaging revealed late gadolinium enhancement in a highly variable and non-coronary distribution, with simultaneous involvement of subepicardial, subendocardial, and midwall tissue. High-resolution computed tomography of the thorax revealed significant intrathoracic lymphadenopathy. Endobronchial ultrasound-guided lymph node sampling and analysis revealed the presence of non-caseating granulomas, providing histological confirmation of the disease. The patient's clinical course was complicated by the development of ventricular standstill, thus insertion of an implantable cardioverter-defibrillator was carried out. Immunosuppressive therapy with oral prednisolone was commenced prior to discharge. Discussion: Cardiac sarcoidosis can produce life-threatening complications if left untreated. Our case serves to highlight the need for consideration of sarcoidosis as a cause for cardiac conduction disease in young patients, and the utility of multimodality imaging in its diagnosis. Cardiac magnetic resonance imaging serves as a useful tool when faced with this clinical picture.
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