When a Stroke Is Silent

When a Stroke Is Silent
A study shows that seemingly healthy adults can suffer a brain attack without knowing it. Transcript of radio broadcast:
12 August 2008

This is the VOA Special English Health Report.

A stroke is a loss of blood flow in the brain. There are two kinds of stroke. One is an ischemic stroke. It happens when a blood vessel in the brain gets blocked. The other kind is called a hemorrhagic, or bleeding, stroke. This happens when a blood vessel breaks.
Strokes can cause death or disability. Bleeding strokes are more likely to kill than ischemic strokes. But ischemic strokes are more common -- and doctors can treat them with a drug that breaks up blood clots.

If you think someone is having a stroke, you should seek help immediately. Experts at the United States National Institutes of Health say the treatment has to begin within three hours. But they say people need to get to the hospital within one hour so doctors have time to examine them.

Usually the warning signs appear suddenly. These include trouble walking, weakness especially on one side of the body, difficulty seeing and difficulty speaking.

Yet a recent study showed that seemingly healthy middle-aged people can suffer a stroke without immediately knowing it. The study involved about two thousand people. They were the children of men and women who took part in a major research project in Massachusetts called the Framingham Heart Study.

The average age in the new study was sixty-two. The people were examined every four to eight years. They were given M.R.I., magnetic resonance imaging, tests to inspect for damaged brain tissue and signs of stroke.

The imaging showed that nearly eleven percent of those with no reported stroke had suffered a silent cerebral infarction, or silent stroke. Silent strokes are brain injuries likely caused by a blockage that limits blood supply to the brain.

The researchers reported a link between silent stroke and a condition called atrial fibrillation. Atrial fibrillation is the most common cause of abnormal heartbeat in older adults.

Sudha Seshadri at the Boston University School of Medicine says atrial fibrillation more than doubled the risk of a stroke. Doctor Seshadri says the findings show the need for early testing and treatment of conditions that could lead to heart disease.

The study appeared in Stroke, a journal of the American Heart Association.

Other risk factors for a silent stroke are high blood pressure, heart disease, diabetes and tobacco use.

And that's the VOA Special English Health Report. For more health news, go to voaspecialenglish.com. I'm Steve Ember.


----------------------------Google Translate
当一个中风是沉默
一项研究表明，看似健康的成年人可以受到脑的攻击毫不知情。全文电台广播：
2008年8月12日

这是美国之音特别英语卫生报告。

中风是一种损失，血流在大脑中。有两种，一种中风。一个是缺血性中风。它发生时，血管在大脑中得到封锁。另一种是所谓的出血，或出血，中风。发生这种情况时，血管休息。
中风可导致死亡或伤残。出血中风，更有可能杀死比缺血性中风。但缺血性中风较常见的-和医生可以把他们与一个毒品打破了血块。

如果您认为有人是有中风，你应该立即寻求协助。专家们在美国国家卫生研究所说，治疗已开始三小时内。但是他们说，人民需要去医院一小时内，使医生有时间加以研究。

通常警告标志，出现突然。这些措施包括麻烦，散步，弱点，尤其是在身体一侧，看到困难和艰巨性发言。

然而，最近的一项研究表明，看似健康的中年人民可能遭受中风，没有立即知道。该研究涉及约2000人。他们的子女男人和女人谁参加了在重大研究项目，在马萨诸塞州弗雷明汉称为心脏研究。

平均年龄在新的研究是62 。人民的检查，每4年至8年。给他们的MRI ，磁共振成像，测试，以检查受损的脑组织和中风的迹象。

影像显示，近11 ％的受访者没有报告中风遭受了沉默，脑梗塞，中风或沉默。沉默的中风脑损伤可能造成的堵塞，限制血液供应到大脑。

研究报告之间的联系，沉默的中风和条件，所谓的心房颤动。心房颤动是最常见的原因异常的心跳在老年人。

sudha seshadri在波士顿大学医学院的说，心房颤动增加了一倍以上的风险中风。医生seshadri说，调查结果显示有必要及早检测和治疗的条件，可能导致心脏病。

研究中出现的中风，杂志的美国心脏协会。

其他危险因素的一种无声的中风是血压高，心脏病，糖尿病和使用烟草。

这是该美国之音特别英语卫生报告。更多健康资讯，到voaspecialenglish.com 。我史蒂夫ember 。