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This is the VOA Special English Health Report.
A concussion1 happens when the brain is shaken, often in a car crash or a fall or a strike to the head in sports. Concussions2 can be mild, but doctors may order a CT scan to look for a more serious injury. Computed3 tomography provides a detailed4 image of the brain. But a recent study warned that more children than necessary are being exposed to radiation this way.
A doctor looks at a CT brain scan at Children's National Medical Center in Washington
A national team led by two doctors at the University of California, Davis, studied hospital records from thousands of children with head injuries. They found that in many cases, the risk of developing cancer from the radiation outweighed5 the risk of a serious brain injury.
The study found that one in five children over age two had a low risk of serious injury but received CT scans anyway. The same was true of almost one in four children under two years of age.
The researchers have developed rules to predict if a head injury is serious enough for a scan. For children under two, doctors are advised against it if there is:
Normal mental activity.
No swelling6 in the back of the head.
No feeling of a broken bone in the skull7.
And no loss of consciousness for more than five seconds.
Doctors should also consider how the child was injured and whether the parents say the child is acting8 normally.
For patients from two to eighteen, the guidelines are similar -- except there should be no loss of consciousness, no vomiting9 and no severe headache.
The report appears in the Lancet medical journal.
Earlier this year, the British Journal of Sports Medicine published new guidelines for concussions in children and teens. International experts said they should not return to sports or school until fully10 recovered. The brain also needs a "cognitive11 rest," they say, by restricting activities like video games, texting and watching TV.
Young people often take longer than adults to recover from a concussion. The experts say individual progress and not a set time period should always guide a decision to return to play.
More than one million cases of concussion are reported each year in the United States alone.
A congressional committee has called a hearing Wednesday to discuss legal issues related to head injuries in football. Recently there have been concerns about players retired12 from the National Football League. But professionals are not the only ones getting concussions. There are high school players who have died from brain injuries.
And that's the VOA Special English Health Report, written by Caty Weaver13. I'm Steve Ember.
1 concussion | |
n.脑震荡;震动 | |
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2 concussions | |
n.震荡( concussion的名词复数 );脑震荡;冲击;震动 | |
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3 computed | |
adj.[医]计算的,使用计算机的v.计算,估算( compute的过去式和过去分词 ) | |
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4 detailed | |
adj.详细的,详尽的,极注意细节的,完全的 | |
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5 outweighed | |
v.在重量上超过( outweigh的过去式和过去分词 );在重要性或价值方面超过 | |
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6 swelling | |
n.肿胀 | |
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7 skull | |
n.头骨;颅骨 | |
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8 acting | |
n.演戏,行为,假装;adj.代理的,临时的,演出用的 | |
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9 vomiting | |
吐 | |
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10 fully | |
adv.完全地,全部地,彻底地;充分地 | |
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11 cognitive | |
adj.认知的,认识的,有感知的 | |
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12 retired | |
adj.隐退的,退休的,退役的 | |
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13 weaver | |
n.织布工;编织者 | |
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