Methods: A total of 63 patients with HF and 30 control subjects were investigated by measuring the serum BNP levels and the left ventricular ejection fraction (LVEF).

• 方法：采用免疫荧光法测定63例心力衰竭患者和30例对照组血浆BNP浓度，用心脏彩色多普勒超声诊断仪测定并比较各组左室射血分数(LVEF)。