Stent Failure: How Much of the Problem Is Caused by Doctors? (1/2)
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[划词 ]
参考答案: 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 arteries in heart patients. The stent is usually left in permanently after doctors clean out a narrowed artery 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 blockages 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 2 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.
马上在新VOA系统中听写本篇
[划词 ]
参考答案: 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 arteries in heart patients. The stent is usually left in permanently after doctors clean out a narrowed artery 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 blockages 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 2 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.
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