Objective To evaluate left heart function in pre-dialysis patients with different stages of chronic kidney disease (CKD) by tissue Doppler velocity imaging (TVI).
目的采用组织多普勒速度成像（TVI）评价不同阶段慢性肾脏疾病患者的左心功能变化。
2
The calculation results show that both the velocity and pressure in gas explosion process experience the stages of "rise - fall - second wave - fall - swing".
计算结果表明，矿井瓦斯气体爆炸过程中速度和压力值均会经历上升-下降-二次波峰-下降-震荡的过程。
3
ObjectiveTo study the speciality of cerebral blood flow velocity of patients with spinal cord injury at different stages after injury.