英语语法分析

Calcium channel blockers reduce afterload with little effect on preload.

钙通道阻滞剂降低后负荷，而对前负荷几乎没有作用。

Variation of afterload influenced not only early, but also late diastolic filling parameters.

后负荷变化影响舒张早期及心房收缩期左室充盈。

Objective To investigate the effect of afterload pressure on hemolytic blood damage in centrifugal pump.

目的 探讨离心泵后负荷压力对血液破坏的影响。