全文获取类型
收费全文 | 1416660篇 |
免费 | 117028篇 |
国内免费 | 4646篇 |
专业分类
耳鼻咽喉 | 18541篇 |
儿科学 | 46600篇 |
妇产科学 | 41226篇 |
基础医学 | 200940篇 |
口腔科学 | 37949篇 |
临床医学 | 127455篇 |
内科学 | 284152篇 |
皮肤病学 | 33441篇 |
神经病学 | 116830篇 |
特种医学 | 54290篇 |
外国民族医学 | 480篇 |
外科学 | 211728篇 |
综合类 | 35955篇 |
现状与发展 | 8篇 |
一般理论 | 492篇 |
预防医学 | 110266篇 |
眼科学 | 31796篇 |
药学 | 99989篇 |
5篇 | |
中国医学 | 4159篇 |
肿瘤学 | 82032篇 |
出版年
2021年 | 10640篇 |
2019年 | 12238篇 |
2018年 | 17181篇 |
2017年 | 13252篇 |
2016年 | 14809篇 |
2015年 | 16828篇 |
2014年 | 23545篇 |
2013年 | 34200篇 |
2012年 | 46600篇 |
2011年 | 49414篇 |
2010年 | 29097篇 |
2009年 | 27749篇 |
2008年 | 45168篇 |
2007年 | 47763篇 |
2006年 | 48295篇 |
2005年 | 46756篇 |
2004年 | 44346篇 |
2003年 | 42175篇 |
2002年 | 40619篇 |
2001年 | 73320篇 |
2000年 | 74743篇 |
1999年 | 61551篇 |
1998年 | 16307篇 |
1997年 | 14673篇 |
1996年 | 14745篇 |
1995年 | 14898篇 |
1994年 | 13496篇 |
1993年 | 12627篇 |
1992年 | 45882篇 |
1991年 | 43559篇 |
1990年 | 41537篇 |
1989年 | 39589篇 |
1988年 | 36205篇 |
1987年 | 35374篇 |
1986年 | 32869篇 |
1985年 | 31280篇 |
1984年 | 23793篇 |
1983年 | 19973篇 |
1982年 | 12168篇 |
1981年 | 10732篇 |
1979年 | 20664篇 |
1978年 | 14546篇 |
1977年 | 12034篇 |
1976年 | 11313篇 |
1975年 | 11583篇 |
1974年 | 13965篇 |
1973年 | 13512篇 |
1972年 | 12622篇 |
1971年 | 11459篇 |
1970年 | 10894篇 |
排序方式: 共有10000条查询结果,搜索用时 31 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.
Deitelzweig Steve Luo Xuemei Nguyen Jennifer L. Malhotra Deepa Emir Birol Russ Cristina Li Xiaoyan Lee Theodore C. Ferri Mauricio Wiederkehr Danny Reimbaeva Maya Barnes Geoffrey D. Piazza Gregory 《Journal of thrombosis and thrombolysis》2022,54(4):696-696
Journal of Thrombosis and Thrombolysis - 相似文献
3.
目的 探讨血液肿瘤患者接受化疗后发生肛周感染的危险因素。方法 采用回顾性病例对照研究的方法,对四川省某三级甲等医院血液内科2020年12月—2021年5月收治的进行化疗的348例血液肿瘤住院患者相关资料(人口学特征、疾病特征、医疗及护理病例记录、实验室检查结果)予以回顾性分析,根据出院诊断发生肛周感染的病例作为病例组,其余病例作为对照组,统计血液肿瘤患者接受化疗后肛周感染的发生率,采用单因素分析和二元Logistic回归分析肛周感染的危险因素。结果 348例血液肿瘤化疗患者,发生肛周感染35例,感染率为10.1%;Logistic回归分析显示,年龄<60岁(OR=8.776,P=0.039)、痔疮史(OR=7.733,P<0.001)、肛周感染史(OR=14.981,P<0.001)、腹泻(OR=3.893,P=0.019)及白细胞计数<1×109/L(OR=6.851,P=0.002)是血液肿瘤患者接受化疗后发生肛周感染的独立危险因素。结论 血液肿瘤患者接受化疗后肛周感染的发生率较高,年龄<60岁、痔疮史、肛周感染史、腹泻、白细胞计数<1×109/L导致血液肿瘤化疗患者肛周感染率增加,在护理化疗期的血液肿瘤患者过程中,应该结合肛周感染的危险因素,采取针对性干预措施,降低肛周感染发生率。 相似文献
4.
5.
6.
7.
White and brown adipose tissue functionality is impaired by fine particulate matter (PM2.5) exposure
Della Guardia Lucio Shin Andrew C. 《Journal of molecular medicine (Berlin, Germany)》2022,100(5):665-676
Journal of Molecular Medicine - Chronic exposure to high levels of particulate matter (PM) is correlated to a higher prevalence of cardio-metabolic disturbances. Adipose tissue represents a pivotal... 相似文献
8.
9.
10.
Malou A.H. Nuijten Thijs M.H. Eijsvogels Valerie M. Monpellier Ignace M.C. Janssen Eric J. Hazebroek Maria T.E. Hopman 《Obesity reviews》2022,23(1):e13370
Postbariatric loss of muscle tissue could negatively affect long-term health due to its role in various bodily processes, such as metabolism and functional capacity. This meta-analysis aimed to unravel time-dependent changes in the magnitude and progress of lean body mass (LBM), fat-free mass (FFM), and skeletal muscle mass (SMM) loss following bariatric surgery. A systematic literature search was conducted in Pubmed, Embase, and Web of Science. Fifty-nine studies assessed LBM (n = 37), FFM (n = 20), or SMM (n = 3) preoperatively and ≥1 time points postsurgery. Random-effects meta-analyses were performed to determine pooled loss per outcome parameter and follow-up time point. At 12-month postsurgery, pooled LBM loss was ?8.13 kg [95%CI ?9.01; ?7.26]. FFM loss and SMM loss were ?8.23 kg [95%CI ?10.74; ?5.73] and ?3.18 kg [95%CI ?5.64; ?0.71], respectively. About 55% of 12-month LBM loss occurred within 3-month postsurgery, followed by a more gradual decrease up to 12 months. Similar patterns were seen for FFM and SMM. In conclusion, >8 kg of LBM and FFM loss was observed within 1-year postsurgery. LBM, FFM, and SMM were predominantly lost within 3-month postsurgery, highlighting that interventions to mitigate such losses should be implemented perioperatively. 相似文献