Anderson, Wesley L.Bahrami, Mubashir H.Guglin, MayaRao, Roopa2023-02-162023-02-162021-02Anderson WL, Bahrami MH, Guglin M, Rao R. Lymphocytic myocarditis with suspected granulomatosis with polyangiitis presenting as cardiogenic shock, restrictive cardiomyopathy and complete heart block. J Cardiol Cases. 2021;24(3):102-105. Published 2021 Feb 26. doi:10.1016/j.jccase.2021.02.005https://hdl.handle.net/1805/31271We report a case of restrictive cardiomyopathy from lymphocytic myocarditis in a patient with suspected granulomatosis with polyangiitis (GPA). The case was complicated by complete heart block and renal failure. The diagnosis was supported by upper airway involvement, elevated serum serine proteinase 3 antibodies, and endomyocardial biopsy with lymphocytic infiltration. The patient responded appropriately to aggressive immunosuppressive therapy.en-USAcute heart failureRestrictiveSystolic heart failureDiastolic heart failureAutoimmuneArticle