全文获取类型
收费全文 | 300177篇 |
免费 | 9859篇 |
国内免费 | 1071篇 |
专业分类
耳鼻咽喉 | 4004篇 |
儿科学 | 9674篇 |
妇产科学 | 8618篇 |
基础医学 | 38384篇 |
口腔科学 | 10842篇 |
临床医学 | 23806篇 |
内科学 | 61702篇 |
皮肤病学 | 6781篇 |
神经病学 | 21418篇 |
特种医学 | 13577篇 |
外国民族医学 | 98篇 |
外科学 | 43457篇 |
综合类 | 1585篇 |
一般理论 | 29篇 |
预防医学 | 23626篇 |
眼科学 | 6172篇 |
药学 | 20035篇 |
2篇 | |
中国医学 | 627篇 |
肿瘤学 | 16670篇 |
出版年
2022年 | 1661篇 |
2021年 | 3751篇 |
2020年 | 2142篇 |
2019年 | 3078篇 |
2018年 | 7197篇 |
2017年 | 6295篇 |
2016年 | 5848篇 |
2015年 | 7684篇 |
2014年 | 8343篇 |
2013年 | 8931篇 |
2012年 | 18068篇 |
2011年 | 13557篇 |
2010年 | 7045篇 |
2009年 | 7921篇 |
2008年 | 9277篇 |
2007年 | 10046篇 |
2006年 | 9766篇 |
2005年 | 17614篇 |
2004年 | 18515篇 |
2003年 | 13417篇 |
2002年 | 8252篇 |
2001年 | 5445篇 |
2000年 | 2737篇 |
1999年 | 6746篇 |
1998年 | 1334篇 |
1992年 | 7194篇 |
1991年 | 7378篇 |
1990年 | 7607篇 |
1989年 | 7164篇 |
1988年 | 6661篇 |
1987年 | 6402篇 |
1986年 | 6139篇 |
1985年 | 5416篇 |
1984年 | 3823篇 |
1983年 | 3079篇 |
1982年 | 1211篇 |
1979年 | 3930篇 |
1978年 | 2465篇 |
1977年 | 1877篇 |
1976年 | 1636篇 |
1975年 | 2546篇 |
1974年 | 3172篇 |
1973年 | 2798篇 |
1972年 | 2803篇 |
1971年 | 2785篇 |
1970年 | 2585篇 |
1969年 | 2497篇 |
1968年 | 2254篇 |
1967年 | 2194篇 |
1966年 | 1914篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
1.
2.
3.
Post-induction hypotension is common and associated with postoperative complications. We hypothesised that pneumatic leg compression reduces post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy. In this double-blind randomised study, patients were allocated randomly to the pneumatic leg compression group (n = 50) or control (n = 50). In the intervention group, pneumatic leg compression was initiated before induction of anaesthesia. In the control group, pneumatic leg compression was initiated 20 min after anaesthesia induction. The primary outcome was the incidence of post-induction hypotension in these groups. Post-induction hypotension was defined as systolic blood pressure < 90 mmHg during the first 20 min after induction. Haemodynamic variables and area under the curve of post-induction systolic blood pressure over time were assessed. Complications associated with pneumatic leg compression were recorded, including: peripheral neuropathy; compartment syndrome; extensive bullae beneath the leg sleeves; and pulmonary thromboembolism. The incidence of post-induction hypotension decreased in the pneumatic leg compression group compared with that in the control group; 5 (10%) vs. 29 (58%), respectively, p < 0.001. In the pneumatic leg compression group, the lowest systolic, diastolic and mean blood pressures 20 min after induction of anaesthesia were significantly greater than the control group. Pneumatic leg compression resulted in an increased area under the curve of systolic blood pressure in the first 20 min after induction, p = 0.001. There were no pneumatic leg compression-related complications. Pneumatic leg compression reduced post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy, suggesting that it is an effective and safe intervention to prevent post-induction hypotension among elderly patients undergoing general anaesthesia. 相似文献
4.
5.
6.
7.
8.
9.
Jose M. Morales Jose Angel Martinez-Flores Manuel Serrano Maria José Castro Francisco Javier Alfaro Florencio García Miguel Angel Martínez Amado Andrés Esther González Manuel Praga Estela Paz-Artal Antonio Serrano 《Journal of the American Society of Nephrology : JASN》2015,26(3):735-745
In the current immunosuppressive therapy era, vessel thrombosis is the most common cause of early graft loss after renal transplantation. The prevalence of IgA anti–β2-glycoprotein I antibodies (IgA-aB2GPI-ab) in patients on dialysis is elevated (>30%), and these antibodies correlate with mortality and cardiovascular morbidity. To evaluate the effect of IgA-aB2GPI-ab in patients with transplants, we followed all patients transplanted from 2000 to 2002 in the Hospital 12 de Octubre prospectively for 10 years. Presence of IgA-aB2GPI-ab in pretransplant serum was examined retrospectively. Of 269 patients, 89 patients were positive for IgA-aB2GPI-ab (33%; group 1), and the remaining patients were negative (67%; group 2). Graft loss at 6 months post-transplant was significantly higher in group 1 (10 of 89 versus 3 of 180 patients in group 2; P=0.002). The most frequent cause of graft loss was thrombosis of the vessels, which was observed only in group 1 (8 of 10 versus 0 of 3 patients in group 2; P=0.04). Multivariate analysis showed that the presence of IgA-aB2GPI-ab was an independent risk factor for early graft loss (P=0.04) and delayed graft function (P=0.04). There were no significant differences regarding patient survival between the two groups. Graft survival was similar in both groups after 6 months. In conclusion, patients with pretransplant IgA-aB2GPI-ab have a high risk of early graft loss caused by thrombosis and a high risk of delayed graft function. Therefore, pretransplant IgA-aB2GPI-ab may have a detrimental effect on early clinical outcomes after renal transplantation. 相似文献