首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   3篇
  外科学   3篇
  2004年   1篇
  2001年   1篇
  1996年   1篇
排序方式: 共有3条查询结果,搜索用时 78 毫秒
1
1.
L. A. H. CRITCHLEY 《Anaesthesia》1996,51(12):1139-1143
This article reviews the current literature on the management of hypotension during subarachnoid block in the elderly. Hypotension results from blockade of the sympathetic nervous system, which causes decreases in both systemic vascular resistance and cardiac output. Abolition of normal cardiovascular reflexes is also important and may explain unexpected cardiac arrests during subarachnoid block. Untreated block in the elderly results in decreases in systolic arterial pressure, systemic vascular resistance and central venous pressure. Cardiac output appears not to decrease as has been previously reported and heart rate is affected by several different factors. Preload to the heart should be maintained during block by giving adequate intravenous fluids and 8 ml. kg−1 is satisfactory in most cases. Adequate preloading prevents decreases in cardiac output and unexpected cardiac arrests. In this respect, mild head down tilt is also beneficial. Ideally, intravenous fluid should be given as the block is developing. Excessive fluid administration serves no useful purpose and can cause fluid overload and urinary retention. If systolic arterial pressure decreases by more than 25%, or to below 90 mmHg, treatment with a vasopressor is indicated. The efficacy of ephedrine has recently been questioned, as it is a poor vasoconstrictor and inotrope in the elderly. The α-adrenoceptor agonists may prove a more logical choice, because they increase both peripheral resistance and preload. Metaraminol by infusion (< 10 ml.h−1 of 10 mg in 20ml) has been used successfully, though hypertension can occur.  相似文献
2.
Chiu CL  Tew GP  Wang CY 《Anaesthesia》2001,56(9):893-897
We conducted a double-blind, randomised, placebo-controlled study evaluating the efficacy of prophylactic metaraminol for preventing propofol-induced hypotension. Thirty patients aged 55-75 years undergoing general anaesthesia were randomly allocated to receive either metaraminol 0.5 mg or saline before administration of fentanyl 1 microg.kg(-1) and propofol 2 mg.kg(-1). Induction of anaesthesia was associated with a decrease in mean and systolic arterial pressure in both groups (p = 0.0001). However, there was no significant difference between the two groups. These results show that prophylactic use of metaraminol 0.5 mg does not prevent the decrease in blood pressure following fentanyl and propofol induction in older patients.  相似文献
3.
Heytman M  Rainbird A 《Anaesthesia》2004,59(12):1210-1215
Anaphylaxis is an uncommon but serious complication of anaesthesia. Most current guidelines for the management of anaphylaxis list only epinephrine as a vasopressor to use in the event of cardiovascular collapse. We present two cases of anaphylaxis under anaesthesia where return of spontaneous circulation was refractory to epinephrine, but occurred following the administration of the alpha-agonist metaraminol. Potential advantages and disadvantages of using epinephrine in this setting, the role of alpha-agonists and some potential mechanisms accounting for their role in successful management are reviewed.  相似文献
1
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号