问答题试述变异型心绞痛的发病特点和心电图表现。

问答题原发性肥厚型心肌病病理改变有哪些特点?

问答题Directions:Writeacompositionaccordingtothefollowingpictureandrequirements.A.Title:GoodMannersB.Wordlimit:160～200words.Outline:(1)Describethepicture.(2)Similarsituationsinotheraspectsofdailylife.(3)Yourcomments.

问答题治疗稳定型心绞痛及不稳定型心绞痛时应如何选择药物?

问答题室上性心动过速主要包括哪几种?试阐明阵发性室上性心动过速的发病机制?特点及发作期的处理?

问答题简述慢性支气管炎的诊断标准。

问答题简述反流性食管炎发病机制。

问答题哪些征象提示上消化道出血患者有继续出血或再出血?

问答题原发性肝癌综合征有哪些表现?

问答题简述慢性心房纤颤的治疗原则。

问答题咯血和大咯血的定义是什么?试述咯血的常见病因与处理原则。

问答题简述胃、食管反流病的发病机制和病理生理。

问答题呼吸性碱中毒合并代谢性碱中毒

问答题列举呼吸衰竭时的临床表现及其基本治疗措施。

问答题One thing that distinguishes the online world from the real one is that it is very easy to find things. To find a copy of The Economist in print, one has to go to a newsstand, which may or may not carry it. Finding it online, though, is a different proposition. Just go to Google, type it in" economist" and you will be instantly directed to economist.com. (46) Indeed, until Google, now the world's most popular search engine, came on to the scene in September 1998, searching online was a hit-or-miss affair. Google was vastly better than anything that had come before: so much better, in fact, that it changed the way many people use the web. (47) Almost overnight, it made the web far more useful, particularly for non-specialist users, many of whom regard Google as the Internet's front door. It's now a worldwide phenomenon. Not only has it made the Internet into an extremely fast and valuable research tool, it's become a common word and has even created a new verb" to google." (48)The recent fuss over Google's stock market flotation obscures its far wider social significance: few technologies, after all, are so influential that their names have become a household verb such as the cloning technology creates the verb" to clone". Google began in 1998 as an academic research project by Sergey Brin and Lawrence Page, who were then graduate students at Stanford University in Palo Alto, California. It was not the first search engine, of course. (49) Existing search engines were able to scan a large portion of the web, build an index, and then find pages that matched particular words, but were less good at presenting those pages, which might number in the hundreds of thousands, in a useful way. Mr. Brin's and Mr. Page's accomplishment was to devise a way to sort the results by determining which pages were likely to be most relevant. They did so by using a mathematical program, called PageRank. (50) This program is at the heart of Google's success, distinguishing it from all search engines and accounting for its apparently magical ability to find the most useful web pages. With this powerful ability. Google distinguished itself from among all the search engines and became an established standing research tool in the online world.

问答题There's a human liver sitting in a lab dish in Madison, Wis. Also a heart, a brain and every bone in the human body even though the contents of the dish are a few cells too small to be seen without a microscope. But these are stem cells, the most immature human cells ever discovered, taken from embryos before they had decided upon their career path in the body. (46) If scientists could only figure out how to give them just the right kick in just the right direction, each could become a liver, a heart, a brain or a bone. (47) When a team from the University of Wisconsin announced their discovery, doctors around the world looked forward to a new era of medicine one without organ-donor shortages or the tissues-rejection problems that bedevil transplant patients today. Doctors also saw obstacles, though. One of them was a U. S. Congress skittish about research on stem cells taken from unwanted human embryos and aborted fetuses. Indeed, 70 lawmakers asked in a firmly worded letter that the Federal Government ban all such work. Yet the era of "grow your own" organs is already upon us, as researchers have sidestepped the stem cell controversy by making clever use of ordinary cells. Today a machinist in Massachusetts is using his own cells to grow a new thumb after he lost part of his chest wall in an accident. A teenager born without half of his chest wall is growing a new cage of bone and cartilage within his chest cavity. Scientists announced that bladders, grown from bladder cells in a lab, have been implanted in dogs and are working. Meanwhile, patches of skin, the first "tissue-engineered" organ to be approved by the U. S. Food and Drug Administration, are healing sores and skin ulcers on hundreds of patients across the U. S. How have scientists managed to do all this without those protean stem cells? Part of the answer is smart engineering. (48) Using materials such as polymers with pores no wider than a toothbrush bristle, researchers have learned to sculpt scaffolds in shapes into which cells can settle. The other part of the answer is just plain cell biology. (49) Scientists have discovered that they don't have to teach old cells new tricks; given the right framework and the right nutrients, cells will organize themselves into real tissues as the scaffolds dissolve. "I'm a great believer in the cells. They're not just lying there, looking stupidly at each other," says Francois Auger, an infectious disease specialist and builder of artificial blood vessels at Laval University in Quebec City. "They will do the work for you if you treat them right." Replacement hearts—or even replacement heart parts—are at least a decade off, estimates Kiki Hellman, who monitors tissue-engineering efforts for the FDA. "Any problem that requires lots of cell types 'talking' to one another is really hard," she notes. Bone and cartilage efforts are much closer to fruition, and could be ready for human trials within two years. (50) And what of those magical stem cells that can grow into any organ you happen to need—if the law and biologists' knowledge permit? "Using them," says Sefton, "is really the Holy Grail./

问答题简述肺间质纤维化的病理与病理生理发病机理的特点。

问答题简述胃良性溃疡与恶性溃疡的主要鉴别。

问答题COPD肺动脉高压形成有哪些主要因素?如何确定是否有肺动脉高压?

问答题引起心源性休克的原因有哪几大类?每一类中列举1～2种常见的疾病。