首页
登录
职称英语
A study published in the New England Journal of Medicine estimated that ther
A study published in the New England Journal of Medicine estimated that ther
游客
2024-04-03
39
管理
问题
A study published in the New England Journal of Medicine estimated that there are an average of 30 in-flight medical emergencies on U.S. flights every day. Most of them are not grave; fainting, dizziness and hyperventilation(换气过度)are the most frequent complaints. But 13% of them—roughly four a day—are serious enough to require a pilot to change course. The most common of the serious emergencies include heart trouble(46%), strokes and other neurological problems(18%), and difficult breathing(6%).
Let’s face it: plane riders are stressful. For starters, cabin pressures at high altitudes are set at roughly what they would be if you lived at 5,000 to 8,000 feet above sea level. Most people can tolerate these pressures pretty easily, but passengers with heart disease may experience chest pains as a result of the reduced amount of oxygen flowing through their blood. Low pressure can also cause the air in body cavities to expand—as much as 30%. Again, most people won’t notice anything beyond mild stomach cramping. But if you’ve recently had an operation, your wound could open. And if a medical device has been implanted in your body—a splint, a tracheotomy(气管切开术)tube or a catheter(导管)—it could expand and cause injury.
Another common in-flight problem is deep venous thrombosis(深静脉血栓)—the so-called economy-class syndrome. When you sit too long in a cramped position, the blood in our legs tends to clot. Most people just get sore calves. But blood clots, left untreated, could travel to the lungs, causing breathing difficulties and even death. Such clots are readily prevented by keeping blood flowing; walk and stretch your legs when possible.
Whatever you do, don’t panic. Things are looking up on the in-flight-emergency front. Doctors who come to passengers’ aid used to worry about getting sued; their fears have lifted somewhat since the 1998 Aviation Medical Assistance Act gave them "good Samaritan" protection. And thanks to more recent legislation, flights with at least one attendant are starting to install emergency medical kits with automated defibrillators(电击去颤器)to treat heart attacks.
Are you still wondering if you are healthy enough to fly? If you can walk 150 ft. or climb a flight of stairs without getting winded, you’ll probably do just fine. Having a doctor close by doesn’t hurt, either. [br] According to the passage, why does deep venous thrombosis usually happen?
选项
A、Because the economy class is not spacious enough.
B、Because there are too many economy-class passengers.
C、Because passengers are not allowed to walk during the flight.
D、Because the low pressure in the cabin prevents blood flowing smoothly.
答案
A
解析
第3段末句建议乘客有机会就多运动或伸展腿部,由此可以推断该段第2句中的cramped表明经济舱的空间狭窄,因此选项A为本题答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3539640.html
相关试题推荐
[originaltext]W:We’veallheardthesaying“Laughteristhebestmedicine.”Ho
[originaltext]The2016NobelPeacePrizeformedicinehasbeenawardedtoa
[originaltext]The2016NobelPeacePrizeformedicinehasbeenawardedtoa
[originaltext]The2016NobelPeacePrizeformedicinehasbeenawardedtoa
AstudypublishedintheNewEnglandJournalofMedicineestimatedthatther
AstudypublishedintheNewEnglandJournalofMedicineestimatedthatther
AstudypublishedintheNewEnglandJournalofMedicineestimatedthatther
AstudypublishedintheNewEnglandJournalofMedicineestimatedthatther
IwenttoaCatholicboysschoolinBlackpoolintheNorthofEngland.Inmy
IwenttoaCatholicboysschoolinBlackpoolintheNorthofEngland.Inmy
随机试题
[originaltext]Topofficialsincity,stateandthefederalgovernmentsaree
Carsandotherroadvehiclesarethesinglemainsourceofharmfulnitrogen
关于出版从业人员的管理,说法正确的有( )。A.一年内造成两种以上图书不合格的
高血压病人的麻醉前准备包括A.控制舒张压,使舒张压<100mmHg B.纠正心
患者,男,45岁。发热、皮肤发黄2个月。查体:皮肤、巩膜黄染,颈部可见蜘蛛痣,肝
下列各项,属于公共租赁住房合同终止的情形有( )。A.承租人陈某利用公共租赁住
某企业大批量生产一种产品,该企业为了安排下年度的年度、季度生产任务,现在进行生产
女性,42岁,活动后心悸、气促、呼吸困难、乏力3个月入院。体查:血压100/85
导致基础代谢率增高的病理情况是 A.发热B.心脏病伴呼吸困难C.肾病
A.肉桂 B.杜仲 C.黄柏 D.白鲜皮 E.厚朴内表面呈类白色的中药材
最新回复
(
0
)