In every group, the diastolic coronary sinus peak flow velocity /index (DCSV/DCSI) and coronary sinus antegrade flow velocity/index(CSV/CSI)was measured before and after handgrip exercise echocardiography by HP SONOS 5500 at right heart inflow view.

• 经胸超声测定各组于等长握力负荷试验前后的冠状静脉窦舒张期血流峰值速度及速度积分(diastolic coronary sinus peak flow velocity/index，DCSV/DCSI)，前向血流峰值速度及速度积分(coronary sinus antegrade flow velocity/index，CSWCSI)。