Echocardiography examination was performed to determine left ventricular mass index (LVMI) and the ratio of early diastolic E and late diastolic A (E/A).

• 分别用超声心动图测定对照组左心室质量指数，以及三组舒张早期速度峰值与舒张晚期速度峰值，计算两者的比值；