SCIENCE IN THE NEWS - Aspirin: One of the Most Widely Used D
SCIENCE IN THE NEWS - Aspirin 1: One of the Most Widely Used Drugs in the World
By George Grow
Broadcast: Tuesday, September 13, 2005
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VOICE ONE:
This is SCIENCE IN THE NEWS, in VOA Special English. I'm Barbara Klein.
Aspirin
VOICE TWO:
And I'm Bob Doughty 2. On our program today, we tell about aspirin. It is one of the most widely used medicines in the world. We also tell about some recent studies involving aspirin.
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VOICE ONE:
More than two thousand years ago, the Greek doctor Hippocrates advised his patients about a way to ease pain. He told them to bite, or chew, on the bark of the willow 3 tree. The outer covering of the tree contains a chemical called salicylic acid.
By the seventeen hundreds, people used willow bark to reduce high body temperatures. In eighteen ninety-seven, a research scientist at the Bayer Company in Germany created acetyl salicylic acid. The company called the product aspirin, from the spirea plant, which also contains the chemical.
VOICE TWO:
Aspirin has been sold for more than a century as a treatment for high body temperatures, headaches and muscle pain. In nineteen eighty-two, a British scientist shared the Nobel Prize in Medicine in part for discovering how aspirin works. Sir John Vane found that aspirin blocks the body from making natural substances called prostaglandins. Prostaglandins have several effects on the body. Some cause pain and the expansion, or swelling 4, of damaged tissue. Others protect the lining 5 of the stomach and small intestine 6.
Prostaglandins also make the heart, kidneys, and blood vessels 8 work well. But there is a problem. Aspirin works against all prostaglandins, good and bad.
VOICE ONE:
Scientists learned how aspirin interferes 10 with an enzyme 11. One form of this enzyme makes the prostaglandin that causes pain and swelling. Another form of the enzyme creates the protective effect. So aspirin can reduce pain and swelling in damaged tissues. But it can also harm the inside of the stomach and small intestine.
Today, aspirin competes with a lot of other pain medicines. Many people like to take acetaminophen instead. This is the active substance in products like Tylenol. Still, experts say aspirin does some things that the others cannot.
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VOICE TWO:
Many people take aspirin to reduce the risk of a heart attack. Scientists say aspirin prevents blood cells called platelets from sticking together to form clots 13. Clots can block the flow of blood to the heart or the brain. This can cause heart attacks or strokes.
The use of aspirin to reduce the risk of heart disease has grown in recent years. One doctor first noted 14 this effect in the nineteen-fifties.
VOICE ONE:
The doctor was Lawrence Craven. He observed unusual bleeding among children who chewed on aspirin gum to ease pain after a throat operation. Doctor Craven believed they were bleeding because aspirin prevented the blood from thickening. He decided 15 that aspirin might help prevent heart attacks caused by blood clots.
So Doctor Craven examined medical records of about eight thousand people. He found no heart attacks or strokes among those who often used aspirin. Doctor Craven invited other scientists to test his ideas. But it was many years before large studies took place.
VOICE TWO:
Charles Hennekens of the Harvard Medical School led one of the studies. In nineteen eighty-three, he began to study more than twenty-two thousand healthy male doctors over forty years of age. Half the doctors in the study took an aspirin every other day. The other half took what they thought was aspirin, but was just a harmless substance, or placebo 16.
Five years later, Doctor Hennekens reported that the men who took aspirin reduced their chances of a heart attack. However, the men who took aspirin also had a higher risk of bleeding in the brain.
VOICE ONE:
In recent years, a group of American medical experts examined studies on aspirin for the Department of Health and Human Services. The experts said people who have an increased risk of a heart attack should take a small amount of aspirin every day.
People who are most likely to suffer a heart attack include men over the age of forty and women over the age of fifty. People who weigh too much or smoke cigarettes also are at greater risk. So are people with diabetes 17, heart disease, high blood pressure or high levels of cholesterol 18 in the blood.
VOICE TWO:
A major study in two thousand five confirmed that aspirin can also help women. Julie Buring of Brigham and Women's Hospital in Boston, Massachusetts, led the study. She said that among apparently 19 health people, aspirin reduces the risk of heart attack in men. But for women it appears to reduce the risk of stroke.
The New England Journal of Medicine reported the findings. The study lasted ten years. It involved forty thousand women age forty-five and older. Those who received aspirin took one hundred milligrams every other day. The others took a placebo.
The study found that the women who took aspirin were seventeen percent less likely to have a stroke than the other women. The aspirin group also had a twenty-four percent lower risk for the most common form of stroke. This is caused by a clot 12 in a blood vessel 7 that carries blood to the brain.
The study found that aspirin had an even greater effect in women sixty-five years of age and older. Those who took aspirin were thirty percent less likely to have a stroke caused by a blood clot. They were also less likely to suffer a heart attack than those given a placebo.
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VOICE ONE:
Aspirin may help someone who is having a heart attack caused by a blockage 20 in the flow of blood to the heart. Aspirin thins the blood. This can permit blood to flow past the blockage in the artery 21.
But heart experts say people should seek emergency help immediately. They say an aspirin is no substitute for treatment. Some people should not take aspirin. These include people who take other blood thinners or have bleeding disorders 22.
VOICE TWO:
Like other medicines, aspirin can cause problems, especially if taken in large amounts. Acid in the drug may damage the tissue of the stomach or intestines 23. Aspirin can also interfere 9 with the healing of cells. Some people develop severe bleeding.
Yet other studies have found that aspirin may help prevent cancers of the stomach, intestines and colon 24. Studies in the past twenty years showed that people who take aspirin have unusually low rates of such cancers. For example, a study published in two thousand five showed that long-term use of aspirin helps reduce the risk of colon cancer. However, the amount of aspirin required for this protective effect also could cause serious bleeding in the stomach or intestines.
VOICE ONE:
Another recent report about aspirin involves the most common form of breast cancer. In two thousand four, researchers announced findings from a study of almost three thousand women in New York City. The Journal of the American Medical Association published the findings.
The study compared women who took aspirin several times a week to women who did not. Scientists from Columbia University said the aspirin users had a twenty-five percent lower rate of breast cancer.
One doctor involved in the study said aspirin appeared to reduce the production of the female hormone 25 estrogen. Estrogen is linked to up to seventy percent of all cases of breast cancer. But the scientists said they were not ready to advise women to take aspirin in hopes of protection against breast cancer.
VOICE TWO:
Doctors often do advise aspirin for patients at risk of diseases that result from blood clots, such as a heart attack. However, in two thousand four, a Harvard Medical School publication said that some people get little or no protection from aspirin.
In any case, medical experts say no one should take aspirin for disease prevention without first asking a doctor. Aspirin is sold in different strengths. It can interfere with other drugs. It also is not safe for everyone. Most pregnant women are told to avoid aspirin. Children who take aspirin can suffer from a disease called Reye's syndrome 26. Yet even with its problems, aspirin, remains 27 one of the oldest, least costly 28 and most widely used drugs in the world.
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VOICE ONE:
This SCIENCE IN THE NEWS program was written by George Grow and produced by Cynthia Kirk. I'm Barbara Klein.
VOICE TWO:
And I'm Bob Doughty. Join us again next week for more news about science in VOA Special English.
- The aspirin seems to quiet the headache.阿司匹林似乎使头痛减轻了。
- She went into a chemist's and bought some aspirin.她进了一家药店，买了些阿司匹林。
- Most of successful men have the characteristics of contumacy and doughty.绝大多数成功人士都有共同的特质：脾气倔强，性格刚强。
- The doughty old man battled his illness with fierce determination.坚强的老人用巨大毅力与疾病作斗争。
- The river was sparsely lined with willow trees.河边疏疏落落有几棵柳树。
- The willow's shadow falls on the lake.垂柳的影子倒映在湖面上。
- Use ice to reduce the swelling. 用冰敷消肿。
- There is a marked swelling of the lymph nodes. 淋巴结处有明显的肿块。
- The lining of my coat is torn.我的外套衬里破了。
- Moss makes an attractive lining to wire baskets.用苔藓垫在铁丝篮里很漂亮。
- This vitamin is absorbed through the walls of the small intestine.这种维生素通过小肠壁被吸收。
- The service productivity is the function,including external efficiency,intestine efficiency and capacity efficiency.服务业的生产率是一个包含有外部效率、内部效率和能力效率的函数。
- The vessel is fully loaded with cargo for Shanghai.这艘船满载货物驶往上海。
- You should put the water into a vessel.你应该把水装入容器中。
- The river is navigable by vessels of up to 90 tons. 90 吨以下的船只可以从这条河通过。 来自《简明英汉词典》
- All modern vessels of any size are fitted with radar installations. 所有现代化船只都有雷达装置。 来自《现代汉英综合大词典》
- If we interfere, it may do more harm than good.如果我们干预的话，可能弊多利少。
- When others interfere in the affair,it always makes troubles. 别人一卷入这一事件，棘手的事情就来了。
- The noise interferes with my work. 这噪音妨碍我的工作。
- That interferes with my plan. 那干扰了我的计划。
- Above a certain temperature,the enzyme molecule will become unfolded.超过一定温度，酶分子将会展开。
- An enzyme that dissolves the fibrin of blood clots.能溶解血凝块中的纤维的酶。
- Platelets are one of the components required to make blood clot.血小板是血液凝固的必须成分之一。
- The patient's blood refused to clot.病人的血液无法凝结。
- When you cut yourself, blood clots and forms a scab. 你割破了，血会凝固、结痂。 来自《简明英汉词典》
- Milk clots when it turns sour. 奶变酸就凝块。 来自《现代英汉综合大词典》
- The local hotel is noted for its good table.当地的那家酒店以餐食精美而著称。
- Jim is noted for arriving late for work.吉姆上班迟到出了名。
- This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
- There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。
- The placebo has been found to work with a lot of different cases.人们已发现安慰剂能在很多不同的病例中发挥作用。
- The placebo effect refers to all the observable behaviors caused by placebo.安慰剂效应是指由安慰剂所引起的可观察的行为。
- In case of diabetes, physicians advise against the use of sugar.对于糖尿病患者，医生告诫他们不要吃糖。
- Diabetes is caused by a fault in the insulin production of the body.糖尿病是由体內胰岛素分泌失调引起的。
- There is cholesterol in the cell of body.人体细胞里有胆固醇。
- They are determining the serum-protein and cholesterol levels.他们正在测定血清蛋白和胆固醇的浓度。
- An apparently blind alley leads suddenly into an open space.山穷水尽，豁然开朗。
- He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
- The logical treatment is to remove this blockage.合理的治疗方法就是清除堵塞物。
- If the blockage worked,they could retreat with dignity.如果封锁发生作用，他们可以体面地撤退。
- 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。
- Reports of anorexia and other eating disorders are on the increase. 据报告，厌食症和其他饮食方面的功能紊乱发生率正在不断增长。 来自《简明英汉词典》
- The announcement led to violent civil disorders. 这项宣布引起剧烈的骚乱。 来自《简明英汉词典》
- Perhaps the most serious problems occur in the stomach and intestines. 最严重的问题或许出现在胃和肠里。 来自辞典例句
- The traps of carnivorous plants function a little like the stomachs and small intestines of animals. 食肉植物的捕蝇器起着动物的胃和小肠的作用。 来自辞典例句
- Here,too,the colon must be followed by a dash.这里也是一样，应当在冒号后加破折号。
- The colon is the locus of a large concentration of bacteria.结肠是大浓度的细菌所在地。
- Hormone implants are used as growth boosters.激素植入物被用作生长辅助剂。
- This hormone interacts closely with other hormones in the body.这种荷尔蒙与体內其他荷尔蒙紧密地相互作用。
- The Institute says that an unidentified virus is to blame for the syndrome. 该研究所表示,引起这种综合症的是一种尚未确认的病毒。
- Results indicated that 11 fetuses had Down syndrome. 结果表明有11个胎儿患有唐氏综合征。
- He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
- The remains of the meal were fed to the dog.残羹剩饭喂狗了。