CASE REPORTA 43-year-old Chinese male farmer presented to the hospital with complaints of exertional palpitation and dyspnea for 2 months. He had his discomforts often together with dry cough, and gradually appeared paroxysmal noctual dyspnea, but no chest pain. He had been diagnosed as dilated cardiomyopathy in other hospitals. However, the therapeutic effect was poor. There was no history of hypertension and diabetes mellitus, and no family history of heart diseases. He had smoked cigarettes for 20 years but did not drink alcohol.