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Cardiologists have pioneered the world’s first non-surgical bypass operation to turn a vein into an artery using a new technique

admin2015-04-10  51
问题     Cardiologists have pioneered the world’s first non-surgical bypass operation to turn a vein into an artery using a new technique to divert blood flow in a man with severe heart disease. The keyhole procedure, which avoids the extensive invasive surgery of a conventional bypass, will offer hope to tens of thousands of people at risk from heart attacks.
    Coronary heart disease, where the arteries are progressively silted up with fatty deposits, is responsible in a major industrial country like Britain for more than 160,000 deaths each year. Although major heart surgery is becoming commonplace, with more than 28,000 bypass operations in the UK annually, it is traumatic for patients and involves a long recovery period.
    The new technique was carried out by an international team of doctors who performed the non-invasive surgery on a 53-year-old German patient. According to a special report in Circulation, journal of the American Heart Association, cardiologists developed a special catheter which was inserted into one of his leg arteries, threaded up through the aorta to the top of the diseased artery, which was the only part still open and receiving blood. Then, guided by ultrasound, a physician pushed a needle from inside the catheter through the artery wall and into the adjacent vein. A thin, flexible wire was threaded through the needle and the needle and catheter were withdrawn, leaving the wire behind and a small angioplasty balloon, which was used to widen the channel. Finally, the vein was blocked off just above the new channel allowing blood from the artery to be re-routed down the vein.
    After the procedure, the vein effectively became an artery, carrying blood in the reverse direction from the previous way, and feeding the starved heart tissue with oxygen.
    Dr. Stephen Oesterle, who led the team, said, "This milestone marks the first coronary artery bypass performed with a catheter. The technology offers a realistic hope for truly minimally invasive bypass procedures in the future. One of the most invasive things you can do in medicine is coronary artery bypass surgery. Our ultimate goal is to replace traditional coronary artery bypass with a procedure that does not require surgery. " Dr. Oesterle is director of cardiology at Massachusetts General Hospital and associate professor of medicine at Harvard Medical School in Boston. Melanie Raddon, cardiac nurse at the British Heart Foundation, said it was likely to be many years before the procedure was routinely used in hospitals.
It can be concluded that after the new bypass treatment,
选项 A、the wire inside the vein widens the channel.
B、blood flows in the opposite direction to the former one.
C、the starved heart tissue is fed through the previous blood route.
D、the patient was implanted with a new electronic heart.
答案B
解析 我们可以得出结论：接受这种新的搭桥疗法之后，[A]静脉中的线将扩充通道。[B]血液流动的方向和原来的相反。[C]缺氧的心脏组织通过原来的血流方向得到氧气补给。[D]患者体内被植入了一个新的电子心脏。根据题干中的关键词after the new bypass treatment，可以在第四段中找到解答本题的相关信息。原文指出：静脉实际上就变成了动脉，carrying blood和feeding为并列成分，意思是：沿着与原来相反的方向输送血液，向缺氧的心脏组织供氧。[A]的内容是新疗法的一个步骤，与题干无关．[B]符合血流方向相反的论述，为正确答案．[C]错在是新的血流方向给缺氧的心脏组织供氧，而不是以前的；[D]的内容文章并未提及。
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