全文获取类型
收费全文 | 226715篇 |
免费 | 52329篇 |
国内免费 | 1716篇 |
专业分类
耳鼻咽喉 | 3679篇 |
儿科学 | 6742篇 |
妇产科学 | 3169篇 |
基础医学 | 39146篇 |
口腔科学 | 8308篇 |
临床医学 | 27142篇 |
内科学 | 49019篇 |
皮肤病学 | 11818篇 |
神经病学 | 25743篇 |
特种医学 | 10559篇 |
外国民族医学 | 2篇 |
外科学 | 33546篇 |
综合类 | 2352篇 |
现状与发展 | 6篇 |
一般理论 | 60篇 |
预防医学 | 13476篇 |
眼科学 | 5217篇 |
药学 | 19442篇 |
2篇 | |
中国医学 | 2707篇 |
肿瘤学 | 18625篇 |
出版年
2023年 | 910篇 |
2022年 | 755篇 |
2021年 | 5589篇 |
2020年 | 7412篇 |
2019年 | 13784篇 |
2018年 | 13935篇 |
2017年 | 14278篇 |
2016年 | 15880篇 |
2015年 | 17497篇 |
2014年 | 18651篇 |
2013年 | 20491篇 |
2012年 | 17352篇 |
2011年 | 16779篇 |
2010年 | 15830篇 |
2009年 | 11416篇 |
2008年 | 11168篇 |
2007年 | 9849篇 |
2006年 | 9009篇 |
2005年 | 8233篇 |
2004年 | 7327篇 |
2003年 | 6493篇 |
2002年 | 5748篇 |
2001年 | 4644篇 |
2000年 | 4152篇 |
1999年 | 3056篇 |
1998年 | 1203篇 |
1997年 | 960篇 |
1996年 | 748篇 |
1995年 | 761篇 |
1994年 | 641篇 |
1993年 | 614篇 |
1992年 | 1386篇 |
1991年 | 1362篇 |
1990年 | 1184篇 |
1989年 | 1157篇 |
1988年 | 1053篇 |
1987年 | 1046篇 |
1986年 | 829篇 |
1985年 | 880篇 |
1984年 | 650篇 |
1983年 | 515篇 |
1982年 | 375篇 |
1981年 | 388篇 |
1980年 | 322篇 |
1979年 | 521篇 |
1978年 | 418篇 |
1977年 | 307篇 |
1976年 | 292篇 |
1974年 | 338篇 |
1973年 | 340篇 |
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
1.
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
2.
3.
4.
Lee Hee Yun Hao Zhichao Choi Eun Young 《Journal of immigrant and minority health / Center for Minority Public Health》2022,24(4):996-1004
Journal of Immigrant and Minority Health - Little attention has been paid to online health information seeking (OHIS) among immigrants residing in rural areas. This study examines the intensity of... 相似文献
5.
6.
7.
Kim Wonse Park Heungju Park Jin Joo Kook Woong 《Social psychiatry and psychiatric epidemiology》2022,57(1):47-56
Social Psychiatry and Psychiatric Epidemiology - The negative effect of catastrophic financial loss on suicide risk is widely perceived but hardly studied in-depth because of various difficulties... 相似文献
9.
Comprehensive evidence regarding the treatment of non-anaemic iron deficiency in patients undergoing valvular heart surgery is lacking. This study aimed to investigate the association between non-anaemic iron deficiency and postoperative outcomes in these patients. We retrospectively analysed 321 patients of which 180 (56%) had iron deficiency (defined as serum ferritin < 100 ng.ml-1 or < 300 ng.ml-1 with transferrin saturation < 20%). While the iron-deficient group had lower pre-operative haemoglobin levels than the non-iron deficient group (median (IQR [range]) 134 (127–141 [120–172]) g.l-1, 143 (133–150 [120–179]) g.l-1, p = 0.001), there was no between-group difference in allogeneic red blood cell transfusion. Median (IQR [range]) days alive and out of hospital at postoperative day 90 was 1 day shorter in the iron-deficient group (80 (77–82 [9–85]) days vs. 81 (79–83 [0–85]) days, p = 0.026). In multivariable analysis, only cardiopulmonary bypass duration (p = 0.032) and intra-operative allogeneic red blood cell transfusion (p = 0.011) were significantly associated with reduced days alive and out of hospital at postoperative day 90. Iron deficiency did not exert any adverse influence on secondary outcomes except length of hospital stay. Our findings indicate that non-anaemic iron deficiency alone is not associated with adverse effects in patients undergoing valvular heart surgery when it does not translate into an increased risk of allogeneic transfusion. 相似文献
10.