首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The complications frequently accompanying diabetes, such as impairment of vision and of kidney function, are now thought to resu
The complications frequently accompanying diabetes, such as impairment of vision and of kidney function, are now thought to resu
admin
2014-12-26
67
问题
The complications frequently accompanying diabetes, such as impairment of vision and of kidney function, are now thought to result from the lack of continuous control of blood glucose concentrations. The healthy pancreas, in response to increases in blood glucose concentration, releases small quantities of insulin throughout the day and thereby maintains the concentration within physiological limits(nomoglycemia). But the diabetic generally receives only one large dose daily. The diabetic’ s blood glucose concentration can thus fluctuate greatly during the interval between doses, and it has been suggested that the complication result from the periods of high concentrations of blood glucose(hyperglycemia). Many investigators thus believe that restoration of normoglycemia might halt the progression of such complications and perhaps even reverse them.
There are three primary techniques that have been investigated for restoration of normoglycemia. They are: transplantation of whole, healthy pancreases; transplantation of islets of Langerthan, that portion of the pancreas that actually secretes insulin, and implantation of artificial pancreases. There has, in fact been a great deal of success in the development of these techniques and each seems, on the whole, promising. Nonetheless, it will undoubtedly be many years before any one of them is accepted as a treatment for diabetes.
To many people, the obvious approach would seem to be simply to transplant pancreases from cadavers in the same manner that kidneys and other organs are routinely transplanted. That was the rationale in 1966 when the first recorded pancreas was performed. Between 1960 and 1975, there were forty-six pancreas transplants in forty-five other patients in the United States and five other countries. But only one of these patients is still alive with a functioning graft and surgeons have found that the procedure is not simple as they once thought.
The surviving patient has required no insulin since the operation. Another patient survived 638 days without requiring insulin. And one patient survived a transplantation for more than a year, but died when he chose not to take immunosuppressive drugs. These results, though meagre, suggest that the procedure has the potential for success.
The rest of the patients, however, either rejected the transplant or died within a short period. There does not appear to be any technical problem with the procedure. Rather, most of the patients were already so severely debilitated by the complications of diabetes that they could not withstand the surgery and the immunosuppressive regimen required to prevent rejection. More than half of the patients, furthermore, also required a kidney transplant. Most investigators now agree that the simultaneous transplantation of both organs is too great a shock to the patient and greatly increases the total risk.
It can be inferred from the text that one of the important contributing causes of the failure of most pancreas transplants has been the______.
选项
A、reluctance of patients to cooperate with physicians
B、imperfect techniques used in the operation
C、scarcity of immunosuppressive drugs
D、weakened condition of the patients
答案
D
解析
细节题。根据failure of most pancreas transplants定位到第五段Rather,most of the patients were already so severely debilitated by the complications of diabetesthat they could not withstand the surgery and the immunosuppressive regimen requiredto prevent rejection。“不过,大多数的病人都由于糖尿病的并发病已经很衰弱,以至于无法经受手术和为防止排异反应所需的免疫抑制疗程。”可知大多数胰腺移植手术的失败原因在于病人衰弱的身体,和选项D的表述一致。所以答案选D。
转载请注明原文地址:https://kaotiyun.com/show/IKm7777K
0
大学英语六级
相关试题推荐
AccordingtothemostrecentAmericanFreshmansurvey,conductedannuallybytheUniversityofCalifornia,LosAngeles,undergra
CanthePCIndustryResurrectItself?A)InternetDataCenter’s(IDC)recentreportstatedthatPCshipmentsdeclined13.9%lastqu
ABritishstudyhasfoundthatBvitaminscanreducebrainshrinkageinolderpeoplewithmildmemoryloss.It【B1】______thatBv
ABritishstudyhasfoundthatBvitaminscanreducebrainshrinkageinolderpeoplewithmildmemoryloss.It【B1】______thatBv
A、Keepingitinawarmplace.B、Puttingitinawetenvironment.C、Makingitfrozenforawhile.D、Puttingitunderthesunshine
A、Theythinktheuniversityisawasteoftime.B、Theyfeelhardpressedbythesystem.C、Theyfaceworsefinancialhardshiptha
A、Thedevelopmentofqualityeducation.B、Thechangeofpeople’sinterest.C、Theincreasingnumberofyoungpeople.D、Thecompet
A、Englanddidn’thaveprivateuniversitiesasAmericadid.B、Americanhighereducationwasbetterinquality.C、Englandhadmore
A、Byteachingthemmoretest-takingskills.B、Bygivingthemmoresupervision.C、Byofferingthemcounselingcourses.D、Byassig
随机试题
根据下图所示网络结构回答问题。 如果在不改变路由表项的前提下,在路由器RE和RF最多总共可再接入的路由器数量是________。
Treesareusefultomaninthreeimportantways:theyprovidehimwithwoodandotherproducts;theygivehimshade;andtheyhe
下列各项中,属于税收规章的是()。
一种具有法律约束力的中期周转性票据发行融资的承诺是()。
我国消费者协会是依法成立的对商品和服务进行社会监督的保护消费者合法权益的()。
A、 B、 C、 D、 C封闭空间数4
以国共两党第二次合作为基础的抗日民族统一战线正式形成的主要标志是()
由于工作关系,难得与朋友相聚。
【B1】【B6】
A、Hostandguest.B、Doctorandpatient.C、Managerandofficeworker.D、Travelagentandcustomer.C解答本题的关键在于听清并理解男士的话Didyoufil
最新回复
(
0
)