问题 单项选择题 B型题

出现室性融合波的心律失常是()

A.房性期前收缩

B.室性期前收缩

C.阵发性室性心动过速

D.二度房室传导阻滞

E.交界区期前收缩

答案

参考答案:C

解析:1.二度Ⅰ型房室传导阻滞P-R间期逐渐延长,二尖瓣关闭时间不规律,由于各心搏的舒张期长短不一,舒张末期左心室残余血量不同,所以心音强弱不一。2.室性心动过速时可出现部分心室被正常传导途径所激动,部分心室被室性心动过速波形所激动的情况,出现QRS波波形界于室上性波形和室性波形之间的情况,这称为室早融合波,是室性心律失常的特征性现象。3.这是房性期前收缩伴期前收缩未下传的情况。4.窄QRS波提示为房性期前收缩或交界性期前收缩,房性期前收缩的P波位于QRS波前,而交界性期前收缩的P波可位于QRS波前、之中或之后。5.QRS波宽大畸形,代偿间隙完全是室性期前收缩的心电图特点。

判断题
单项选择题

Reporting on a civil war, a journalist encountered evidence that refugees were starving because the government would not permit food shipments to a rebel-held area. Government censors deleted all mention of the government’s role in the starvation from the journalist’s report, which had not implicated either nature or the rebels in the starvation. The journalist concluded that it was ethically permissible to file the censored report, because the journalist’s news agency would precede it with the notice "Cleared by government censors."
Which one of the following ethical criteria, if valid, would serve to support the journalist’s conclusion while placing the least constraint on the flow of reported information

A.It is ethical in general to report known facts, but unethical to do so while omitting other known facts if the omitted facts would substantially alter an impression of a person or institution that would be congruent with the reported facts.

B.In a situation of conflict, it is ethical to report known facts and unethical to fail to report known facts that would tend to exonerate one party to the conflict.

C.In a situation of censorship, it is unethical to make any report if the government represented by the censor deletes from the report material unfavorable to that government.

D.It is ethical in general to report known facts but unethical to make a report in a situation of censorship if relevant facts have been deleted by the censor, unless the recipient of the report is warned that censorship existed.

E.(E) Although it is ethical in general to report known facts, it is unethical to make a report from which a censor has deleted relevant facts, unless the recipient of the reports is warned that there was censorship and the reported facts do not by themselves give a misleading impression.