<prompt> Most common cardiac involvement in Rheumatoid arthritis isConduction defectsPericarditisMyocarditisInfective Endocarditis  <response>: B Pericarditis CARDIAC COMPLICATIONS OF RHEUMATOID ARTHRITIS Pericarditis: Asymptomatic. One-third of patients with seropositive RA. Myocarditis. Endocarditis. Conduction defects. Coronary vasculitis. Granulomatous aortitis. 