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  3. American Scientists Try to Develop Artificial Blood Vessel with the Skin Cell Scientists have grown blood vessels for kidney

American Scientists Try to Develop Artificial Blood Vessel with the Skin Cell Scientists have grown blood vessels for kidney

admin2013-07-08  45
问题         American Scientists Try to Develop Artificial Blood Vessel with the Skin Cell
    Scientists have grown blood vessels for kidney patients from their own cells, making it easier and safer for them to use dialysis machines, a new study says.
    Todd McAllister of Cytograft Tissue Engineering in California and colleagues implanted lab-grown blood vessels into 10 patients with advanced kidney disease in Argentina and Poland from 2004 to 2007.
    Early results for two of these patients were announced in 2005. In 2007, the scientists published preliminary findings for another 4 patients in the New England Journal of Medicine. In the most recent study, published in the medical journal Lancet, scientists reported on the new blood vessels in those same patients and 4 others.
    Dialysis patients need a vessel to connect them to dialysis machines. This can be made from their own vessels ~ But because dialysis is done so regularly, kidney patients often run out of healthy vessels and need an artificial one. Those are prone to infection.
    In the study, doctors took a small piece of skin from patients. Ceils from those samples were grown in a lab, to help them produce proteins. From those, scientists made sheets of tissue that were rolled into blood vessels 6 to 8 inches long. The vessels were finished after 6 to 9 months. All of the vessels were implanted into patients’ upper arms, to connect them to dialysis machines.
    The vessels failed in three of the patients, which experts said was not surprising in patients so seriously ill. One other patient withdrew from the study and another died of unrelated causes. In the five remaining patients, the vessels worked for at least 6 to 20 months after they were implanted. Afterwards, those patients needed fewer interventions, including surgeries, to maintain the vessels than regular dialysis patients.
    The study was paid for by Cytograft Tissue Engineering. McAllister said he and colleagues plan to test similar devices in patients with heart and leg problems.
    "It’s difficult to predict what will happen next, but they are on the right track." Vladimir Mironov of the Medical University of South Carolina said. But he worried the vessels, which cost between $ 15,000 and $ 20,000 might be too expensive to be used widely. Dr. Bryan Becker, president of the National Kidney Foundation in the US, said about haft of kidney patients could benefit from these vessels if further tests confirm they work.
The passage is mainly about______.
选项 A、the future of man-made blood vessels
B、the development of man-made organs
C、the contribution of Cytograft Tissue Engineering
D、the study on helping kidney patients
答案D
解析 主旨大意题。文章第一段就在说“一项最新的研究表明……”，由此可知，这是关于医学最新发展的报道，内容是新型人造血管的研究，如果研究成功，肾病病人是最早的受益者。所以[D]“关于帮助肾病病人的研究”为正确答案。本文的重点不是研究人造血管，研究的最终目的还是要对病人有益，而且也没有讨论人造血管的发展前景，所以排除[A];[B]“人造器官的发展”在文中根本没有涉及，故排除；虽然实验的费用和人员都是Cytograft生物工程公司出的。但本文的主要内容不是介绍这家公司的贡献，排除[C]。
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