Twelve-lead electrocardiogram: a new-onset incomplete left bundle branch block with ST-segment depression in leads V4–6.Laboratory exams: high-sensitive troponin I (15 182.4 pg/mL), brain natriuretic peptide (315.8 pg/mL), C-reactive protein (134 mg/L), eosinophils (12.18 × 109/L).Transthoracic echocardiogram (TTE): left ventricular ejection fraction (LVEF) 32.9%, global longitudinal strain (GLS) −3.3%, pericardial effusion with right ventricular collapse, and moderate mitral regurgitation.Coronary angiography: normal coronary. This evidence concerns the gene NPPB and mitral valve insufficiency.