VOA慢速英语 2007 0613a

This is the VOA Special English Health Report.

Today we have the second half of a report about some concerns with the use of drug- 
 
treated coronary stents. These are small metal tubes designed to be placed inside arteries¹ in heart patients. The stent is usually left in permanently² after doctors clean out a narrowed artery³ with angioplasty treatment. Doctors expand the stent to hold the passage open so blood can flow normally to the heart.

Medicine on the stent is released slowly over time to stop the development of scar tissue. Scar tissue can cause the artery to become narrow again.

These devices have been approved in the United States for the past four years for patients with simple blockages⁴ and no history of heart attack. But some doctors use drug-eluting stents, as they are called, for patients with more serious heart problems. This is known as "off-label use" and is permitted.

But two recent studies questioned the safety of off-label use of drug-treated stents. Both found that some patients with more serious conditions were more likely to suffer a renarrowing of the artery. This is called restenosis.

So far, researchers have mostly investigated the stents themselves and how they are made. But now attention is turning also to the way they are being used.

The question is how much of the problem of stent failure may be the result of stents not being put in right. Or maybe they are not being expanded enough to fit firmly in the artery.

One recent study found that stents were incorrectly placed in almost seventy percent of the patients in that study.

Now a heart research organization hopes to solve the mystery. The Cardiovascular Research Foundation is a big supporter of the use of drug-treated stents. The foundation is going to carry out a large study. Spokeswoman Irma Damhuis says it will involve eleven thousand patients at ten centers in the United States and two in Germany. A heart doctor with the foundation will be one of the lead investigators⁵.

Researchers will examine how doctors implant⁶ and expand stents and how the methods they use might affect outcomes. The study will deal especially with serious artery blockages that have been found a year or more after a stent was put in place.

And that's the VOA Special English Health Report, written by Caty Weaver⁷. The first part of our report can be found at voaspecialenglish.com. I'm Katherine Cole.

 

1 arteries   

n.动脉( artery的名词复数 )；干线，要道

参考例句：

• Even grafting new blood vessels in place of the diseased coronary arteries has been tried. 甚至移植新血管代替不健康的冠状动脉的方法都已经试过。 来自《简明英汉词典》
• This is the place where the three main arteries of West London traffic met. 这就是伦敦西部三条主要交通干线的交汇处。 来自《简明英汉词典》

2 permanently   

adv.永恒地，永久地，固定不变地

参考例句：

• The accident left him permanently scarred.那次事故给他留下了永久的伤疤。
• The ship is now permanently moored on the Thames in London.该船现在永久地停泊在伦敦泰晤士河边。

3 artery   

n.干线，要道；动脉

参考例句：

• We couldn't feel the changes in the blood pressure within the artery.我们无法感觉到动脉血管内血压的变化。
• The aorta is the largest artery in the body.主动脉是人体中的最大动脉。

4 blockages   

n.堵塞物( blockage的名词复数 )；堵塞，阻塞

参考例句：

• The storms could increase the risks posed by river blockages. 暴风雨会增加因河道堵塞所造成的危险。 来自互联网
• An angiogram shows the location and severity of blockages in blood vessels. 冠状动脉造影能够显示血管内的阻塞位置以及阻塞的严重程度。 来自互联网

5 investigators   

n.调查者，审查者( investigator的名词复数 )

参考例句：

• This memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
• The team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》

6 implant   

vt.注入，植入，灌输

参考例句：

• A good teacher should implant high ideals in children.好教师应该把高尚理想灌输给孩子们。
• The operation to implant the artificial heart took two hours.人工心脏植入手术花费了两小时。

7 weaver   

n.织布工；编织者

参考例句：

• She was a fast weaver and the cloth was very good.她织布织得很快，而且布的质量很好。
• The eager weaver did not notice my confusion.热心的纺织工人没有注意到我的狼狈相。