英语语法分析

The results of evaluating performance properties of FFR are presented in this paper.

本文报道FFR的室内性能评价结果。

However, only in DCM hearts was the proportion of trabeculae exhibiting a normal FFR increased after LVAD.

然而，只有在DCM心脏中有部分小梁在LVAD后显示出正常的FFR增加。

There are very limited studies that actually use FFR to actually guide the intervention as to where to place the stent.

事实上，采用冠脉血流储备指导介入治疗在哪里安置支架的研究非常有限。