心电图上哪些类型室性早搏可能为病理性原因所致?
参考答案：
无症状的孤立的室早，各项检查无器质性心脏病证据，无论其形态和频率如何，一般临床意义不大。但如心电图上出现以下情况，则多提示室早为病理性，应予重视并积极治疗。①多源性室早。②成对或连续出现的室早。③室早出现于前一心搏的T波上(RonT现象)，联律间期小于0．40秒。以上三种情况常易诱发室速和室颤，必须及时处理。④特宽型室早，QRS间期≥O．16秒。⑤特矮型室早，即各导联中室早畸形的QRS波群振幅≤1．0mV。⑥室早QRS波群有显著切迹，上升支或下降支不规则。⑦室早的T波尖锐，二支对称．T波方向与QRS波的主波方向一致、ST段呈水平型下移。⑧平行心律型室早。
| At the beginning of the twentieth century, North American society held, as an ideal, the Nuclear Family. This presumably perfect residential, social, and economic unit consisted of an adult male, an adult female and their minor children. This structure was thought to be stable and long lasting. However, a few decades later, the structure of that ideal family was being altered radically even while it was being touted as the structure to be aimed for. Popular magazines bemoaned the loss of the Nuclear Family and its replacement with inferior forms. There are a number of factors that are acting in concert to apply pressure on the Nuclear Family and generate a variety of new structures. Some of these are: The definition of marriage has changed somewhat in that few people now consider it to last "until death do us part." The concept of monogamy (the marriage of one man and one woman) has been modified to a form now referred to as serial monogamy (the marriage of one man and one woman at a time). This reflects the increasing equality of women and men in terms of economic advantage and the recognition that many women no longer depend on men for their survival. Women are acquiring independence and have become empowered to make their own choices. With this independence, the need to form a relationship with a man becomes less important. This change embodies the concept that the marriage is temporary and can be terminated by either partner at any time. Associated with this, of course, is the relaxation of the divorce laws and the significant reduction of the shame that had one time been attached to divorce. The economy of North America has resulted in a two-tier system of a few rich who control most of the resources and a large portion of the population who control almost none of the resources. Because of this, many couples are forced to have both partners with full-time jobs outside the home. There are unintended byproducts of the need for a double income. The most important of these is the replacement of a mother-oriented socialization of children to a "stranger-oriented" socialization system reflected in the growth of the childcare industry. Also, either partner is financially able to end the marriage without significant hardship. The combination of these changes will in the coming decades have a profound effect on the structure of the family of North America. As a result, the family will be a fluid, constantly changing structure with variable household arrangements as the norm. |
What happened to the Nuclear Family in the middle of the twentieth century
A．It changed greatly.
B．It was criticized.
C．It remained a normal structure.
D．It was lost.
