问题 单项选择题

男性,58岁,因肺心病呼吸衰竭入院。入院查体神志清晰,血气分析:PaO230mmHg,PaCO260mmHg。吸氧后神志不清,血气分析:PaO270mmHg,PaCO280mmHg。该患者病情恶化的原因最可能的是()

A.感染加重

B.气道阻力增加

C.氧疗不当

D.心力衰竭加重

E.周围循环衰竭

答案

参考答案:C

解析:慢性呼吸衰竭(Ⅱ型)有明显二氧化碳潴留时,呼吸中枢对二氧化碳的刺激已不敏感,主要依靠缺氧刺激颈动脉体和颈动脉窦的化学感受器,通过反射维持呼吸,因此慢性Ⅱ型呼吸衰竭患者,氧疗原则为低浓度持续给氧。若高浓度给氧,血氧分压迅速上升,使感受器失去低氧刺激,患者呼吸变浅慢,使肺泡通气量下降,从而加重二氧化碳潴留。

阅读理解

This is time of year when we think about giving and receiving presents. Can you find a little extra to give? On this page we suggest a few organizations you might like to help.

Littleton Children’s Home

We don’t want your money, but children’s toys, books and clothes in good condition would be very welcome.

Also—we are looking for friendly families who would take our children into their homes for a few hours or days as guests. You have so much—will you share it?

Phone Sister Thomas on 55671.

Children’s Hospice

We look after a small number of very sick children. This important work needs skill and love. We cannot continue without gifts of money to pay for more nursing staff. We also need story books and toys suitable for quiet games.

Please contact The Secretary, Little Children’s Hospice, Newby Road.@m

Street Food

In the winter weather, it’s no fun being homeless. It’s even worse if you’re hungry. We give hot food to at least fifty people every night. It’s hard work, but necessary. Can you come and help? If not, can you find a little money? We use a very old kitchen, and we urgently need some new saucepans. Money for new ones would be most welcome indeed.

Contact Street Food, c/o Mary’s House, Elming Way, Littleton. Phone 27713.

Littleton Youth Club

Have you got an unwanted chair?—a record player?—a pot of paint?

Because we can use them!

We want to get to work on our meeting room!

Please phone 66231 and we’ll be happy to collect anything you can give us.

Thank you!

The Night Shelter

We offer a warm bed for the night to anyone who has nowhere to go. We rent the former Commercial Hotel on Green Street. Although it is not expensive, we never seem to have quite enough money. Can you let us have a few pounds? Any amount, however small, will be such a help.

Send it to us at 15, Green St, Littleton. Please make check payable to Night Shelter.

小题1:Reading the passage, you might like to help these organizations which work for     

A.homeless and sick children

B.less fortunate members of our society

C.hungry people who have no beds to sleep in

D.friendly members of our society to help others小题2:If you like children and can offer a happy family to a homeless child, you may go to     .

A.Street Food

B.Night Shelter

C.Children’s Home

D.Children’s Hospice小题3:We can infer that      .

A.there are too many social problems in this country

B.people are very poor during the time for giving presents

C.warm-hearted people like to give away money

D.this passage is taken from a local newspaper小题4:If your child has grown up, you may take the child’s things to       .         

A.Children’s Home and Children’s Hospice

B.Youth Club and Children’s Home

C.Children’s Hospice and Night Shelter

D.Youth Club and Night Shelter

单项选择题