您现在的位置: Language Tips> Audio & Video> Special Speed News  
   
 





 
To improve treatments for multiple sclerosis
[ 2009-01-09 10:20 ]

Download

Researchers have yet to find a cure, but they are developing a better understanding of the disease.

VOICE ONE:

This is SCIENCE IN THE NEWS in VOA Special English. I'm Faith Lapidus.

VOICE TWO:

And I'm Bob Doughty. This week, we tell about the disease multiple sclerosis.

(MUSIC)

VOICE ONE:

Joan Molenaar helps her husband Larry, a victim of multiple sclerosis, in a 2007 photo at their home in Minnesota Multiple sclerosis is not very easy to say. Those who suffer from the disease may also have difficulty naming it. One sign of multiple sclerosis is losing the ability to speak clearly. It is estimated that more than 2,500,000 people worldwide suffer from multiple sclerosis, which also is called MS.

MS is a disease of the brain and spinal cord. The cause of the disease is not known. In patients with MS, the covering of the nerves is destroyed. This temporarily blocks signals that pass through the nerves to the muscles of the body and back to the brain.

The disease especially affects the ability to see, the sense of touch and the use of the arms and legs. Most forms of MS are described as progressive. This means that the disease gets worse as time passes.

VOICE TWO:

The central nervous system of the body includes the brain and the spinal cord. The system contains millions of nerve cells joined together by long thin fibers, like wires. Electric signals start in nerve cells and travel along these fibers to and from the brain. A fatty substance called myelin covers and protects the fibers. Myelin works in the same way that protective coverings work on electric wires.

In patients with MS, the myelin becomes infected. It swells, or grows larger, and loses its connection with the nerve fibers. As time passes, the unconnected myelin is destroyed. Hardened, scar tissue then forms over the nerve fibers. The process of hardening is called sclerosis. The word is from Latin and means scar. The many areas of hardened or scar tissue give the disease its name.

VOICE ONE:

In people with MS, when nerve signals reach a damaged area, some of the signals are blocked or delayed from traveling to or from the brain. This results in problems in different parts of the body. These problems may appear and then disappear, sometimes resulting in long periods when there are no problems at all. Or, they may happen more and more often and become worse. Doctors do not know what causes this process.

Experts say the disease affects women at least 2 times as often as men. And the experts say the average age of people found to have the disease is between 20 and 50 years old.

(MUSIC)

VOICE TWO:

For years, doctors believed that the cause of multiple sclerosis was environmental. They believed this because most of those suffering from the disease lived in northern Europe and the northern half of the United States.

In recent years, however, they have changed their beliefs about the causes of MS. Studies support the theory that there are several causes, instead of a single environmental cause or genetic problem. The studies appear to show that genetic problems are involved in making people likely to get the disease.

The studies also appear to show that environmental causes such as viruses or bacteria may be involved. However, researchers have not identified just what those causes might be. Another likely cause is a problem within the body's defenses against disease, when the defenses misunderstand signals and attack the body.

VOICE ONE:

Multiple sclerosis is different from many other diseases. The signs or symptoms of MS are not always the same. Sometimes, symptoms of the disease appear and then disappear for a long time. For example, one of the symptoms is a lack of feeling in one part of the body or another.

Two other symptoms of the disease are muscle weakness and tiredness. However, these also could be caused by other health problems that are not MS. Other symptoms include a loss of the ability to move normally or a loss of balance. A person suffering from MS also may have difficulty seeing well or speaking clearly.

VOICE TWO:

Doctors who suspect a patient has MS must carry out a number of tests and study the patient's history of health problems. MS symptoms can depend on where the nerve scars are in the body's central nervous system. And some of these signs are not always easy to see.

Magnetic Resonance Imaging is one way to tell if a patient has multiple sclerosis. The test, also known as MRI, involves studying the magnetic signals from all the cells in the body. An MRI can show if there are scars from MS along a patient's nerves. A doctor can use this test to tell if a patient might have the disease, as well as by studying the patient's medical history.

(MUSIC)

VOICE ONE:

There are 4 main kinds of multiple sclerosis. The first kind is called Relapsing-Remitting. About 85 percent of MS patients begin with this form of the disease. More than half of the patients have this form at any one time. These patients have one or two major MS-related problems every one to three years. Then they have periods with no signs of the disease.

The symptoms appear suddenly and last a few weeks or months before slowly disappearing. However, the symptoms may also become worse each time they appear.

VOICE TWO:

The second kind of MS is called Primary Progressive. In this form, the signs of the disease appear and begin to grow worse, with no periods of disappearance. About ten percent of patients begin their struggle with the disease this way.

The third kind of MS is called Secondary Progressive. This form of the disease affects about 50 percent of those with the Relapse-Remitting form of MS. It begins to affect them several years after they have had Relapse-Remitting MS. When the disease changes to Secondary Progressive, the disease begins to grow worse.

The fourth kind of MS is called Progressive Relapsing. It is the worst form of multiple sclerosis. New signs of MS appear while existing ones grow worse. This form of the disease is rare. It affects only five percent of MS cases.

(MUSIC)

VOICE ONE:

Scientists say multiple sclerosis does not appear to be passed from parents to children. However, it does appear to be found in families. The National Multiple Sclerosis Society says one in every 750 Americans is at a risk of developing MS. But the risk rises to one in every 40 people among those who have a close family member with the disease.

It does not appear that one gene is responsible for MS. Instead, several genes may increase the possibility that a person will develop MS. Common viruses or bacteria may also increase the chances that some people will develop the disease.

VOICE TWO:

There is no cure for multiple sclerosis. MS does not always result in severe disability. Many patients with the disease are able to live normal lives. The National Institute of Neurological Disorders and Stroke says many patients do well with no treatment at all. The agency notes that many medicines to treat the disease have serious side effects while some carry risks.

Several kinds of medicine are used to treat the symptoms. Some drugs reduce the swelling in nerve tissue. Drugs known as beta interferons also are used to treat MS. Interferons are genetically engineered copies of proteins found naturally in the body. These proteins help fight viral infections and help the body's defenses against disease.

VOICE ONE:

The United States Food and Drug Administration has approved three forms of beta interferon for treatment of Relapsing-Remitting MS. The FDA also has approved a man-made form of myelin basic protein to treat this kind of MS. And, a treatment to suppress the body's defenses against disease was approved to treat severe cases of MS.

The FDA has approved sales of the drug natalizumab to treat people with relapsing forms of MS. But the drug can be given only in centers where specially-trained doctors can observe patients.

VOICE TWO:

Scientists are working to develop new treatments for MS. The National Multiple Sclerosis Society says more than 100 studies are continuing around the world. Doctors are hopeful that new treatments will help patients with multiple sclerosis in the future.

(MUSIC)

VOICE ONE:

This SCIENCE IN THE NEWS program was written by George Grow. Our producer was Brianna Blake. I'm Faith Lapidus.

VOICE TWO:

And I'm Bob Doughty. Read and listen to our programs at voaspecialenglish.com. Join us again next week for more news about science in Special English on the Voice of America.

 

multiple sclerosis: 多发性硬化

progressive: proceeding step by step(渐进的)

(Source; VOA 英语点津编辑)

 
英语点津版权说明:凡注明来源为“英语点津:XXX(署名)”的原创作品,除与中国日报网签署英语点津内容授权协议的网站外,其他任何网站或单位未经允许不得非法盗链、转载和使用,违者必究。如需使用,请与010-84883631联系;凡本网注明“来源:XXX(非英语点津)”的作品,均转载自其它媒体,目的在于传播更多信息,其他媒体如需转载,请与稿件来源方联系,如产生任何问题与本网无关;本网所发布的歌曲、电影片段,版权归原作者所有,仅供学习与研究,如果侵权,请提供版权证明,以便尽快删除。
相关文章 Related Story
 
 
 
本频道最新推荐
 
Walking in the US first lady's shoes
“准确无误”如何表达
英国新晋超女苏珊大妈改头换面
猪流感 swine flu
你有lottery mentality吗
翻吧推荐
 
论坛热贴
 
别乱扔垃圾。怎么译这个乱字呀?
橘子,橙子用英文怎么区分?
看Gossip Girl学英语
端午节怎么翻译?
母亲,您在天堂还好吗?