Doctors use a measure called 'ejection fraction' to describe the heart's ability to pump blood. Study author Dr. Roberto Bolli of the University of Louisville says people in the control group showed no significant improvement in that measure. But he called the improvement in the stem cell patients "striking." At four months, the pumping ability of the heart was markedly improved. The ejection fraction increased by eight points at four months, and at one year it increased by 12 points. ______________________________________.
医学上用“射血分数”来表示心脏泵血能力。这则研究的发起者是路易斯维尔大学的罗伯托，他表示，实验对照组患者的射血分数并无明显改善。但干细胞的改善“惊人”。四个月的时候，心脏的泵血能力就有显著提升。数据显示，射血分数在四个月时提升了4点，一年后上升了12点。_______________________________。
