Five out of 404 patients had in-hospital pleuritic chest pain with laboratory and echocardiographic features of myopericarditis such as mild LV dysfunction (40 < LVEF < 55%) and/or some rise in cardiac troponin I and mild pericardial effusion, without angiographically significant stenosis, although they had no ECG features in favor of pericarditis. The gene discussed is TNNI3; the disease is pericarditis.