全文获取类型
收费全文 | 41920篇 |
免费 | 3113篇 |
国内免费 | 202篇 |
专业分类
耳鼻咽喉 | 395篇 |
儿科学 | 1302篇 |
妇产科学 | 1099篇 |
基础医学 | 5854篇 |
口腔科学 | 1123篇 |
临床医学 | 4627篇 |
内科学 | 8532篇 |
皮肤病学 | 972篇 |
神经病学 | 4425篇 |
特种医学 | 1021篇 |
外科学 | 4152篇 |
综合类 | 342篇 |
一般理论 | 47篇 |
预防医学 | 4740篇 |
眼科学 | 553篇 |
药学 | 2902篇 |
中国医学 | 141篇 |
肿瘤学 | 3008篇 |
出版年
2023年 | 511篇 |
2022年 | 369篇 |
2021年 | 1498篇 |
2020年 | 1076篇 |
2019年 | 1528篇 |
2018年 | 1777篇 |
2017年 | 1332篇 |
2016年 | 1429篇 |
2015年 | 1634篇 |
2014年 | 1991篇 |
2013年 | 2530篇 |
2012年 | 3768篇 |
2011年 | 3822篇 |
2010年 | 1904篇 |
2009年 | 1602篇 |
2008年 | 2609篇 |
2007年 | 2548篇 |
2006年 | 2392篇 |
2005年 | 2175篇 |
2004年 | 1988篇 |
2003年 | 1720篇 |
2002年 | 1540篇 |
2001年 | 279篇 |
2000年 | 245篇 |
1999年 | 235篇 |
1998年 | 161篇 |
1997年 | 148篇 |
1996年 | 140篇 |
1995年 | 138篇 |
1994年 | 98篇 |
1993年 | 103篇 |
1992年 | 118篇 |
1991年 | 125篇 |
1990年 | 125篇 |
1989年 | 97篇 |
1988年 | 95篇 |
1987年 | 95篇 |
1986年 | 104篇 |
1985年 | 90篇 |
1984年 | 107篇 |
1983年 | 67篇 |
1982年 | 71篇 |
1981年 | 83篇 |
1980年 | 68篇 |
1979年 | 63篇 |
1978年 | 49篇 |
1977年 | 44篇 |
1974年 | 50篇 |
1972年 | 51篇 |
1971年 | 40篇 |
排序方式: 共有10000条查询结果,搜索用时 15 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.
5.
Chalub Lucas Orbolato Nunes Gabriel Pereira Ferrisse Túlio Morandin Strazzi-Sahyon Henrico Badaoui Dos Santos Paulo Henrique Gomes-Filho João Eduardo Cintra Luciano Tavares Angelo Sivieri-Araujo Gustavo 《Clinical oral investigations》2022,26(4):3343-3356
Clinical Oral Investigations - The objective of this systematic review and meta-analysis (SRM) was to answer the question whether the use of ultrasonic irrigation (UI) results in less postoperative... 相似文献
6.
- Children with cancer receive many medications outside the hospital administered by their caregivers.
- The study by Walsh et al. shows the number and types of medication errors in these patients. The study includes data from three different centers.
- Importantly, the study shows the types of errors that cause harm. The authors describe how the harmful errors can be prevented.
- We suggest ways these results can be used to identify which patients and families will benefit from additional attention. Providing more help at clinic and in the home may help prevent harmful medication errors in children with cancer.
7.
8.
9.
Castaldelli-Maia João Mauricio Hofmann Caio Chagas Antonio Carlos Palandri Liprandi Alvaro Sosa Alcocer Alejandro Andrade Laura H. Wielgosz Andreas 《Cardiovascular drugs and therapy / sponsored by the International Society of Cardiovascular Pharmacotherapy》2021,35(3):441-454
Cardiovascular Drugs and Therapy - Major depressive disorder (MDD) and anxiety disorders (AD) are both highly prevalent among individuals with arrhythmia, ischemic heart disease, heart failure,... 相似文献
10.
Alastair JS Webb Amy Lawson Linxin Li Sara Mazzucco Peter M Rothwell for the Oxford Vascular Study Phenotyped Cohort 《Journal of cerebral blood flow and metabolism》2021,41(6):1463
Cerebral arterial pulsatility is strongly associated with cerebral small vessel disease and lacunar stroke yet its dependence on central versus local haemodynamic processes is unclear. In a population-based study of patients on best medical managment, 4–6 weeks after a TIA or non-disabling stroke, arterial stiffness and aortic systolic, diastolic and pulse pressures were measured (Sphygmocor). Middle cerebral artery peak and trough flow velocities and Gosling’s pulsatility index were measured by transcranial ultrasound. In 981 participants, aortic and cerebral pulsatility rose strongly with age in both sexes, but aortic diastolic pressure fell more with age in men whilst cerebral trough velocity fell more in women. There was no significant association between aortic systolic or diastolic blood pressure with cerebral peak or trough flow velocity but aortic pulse pressure explained 37% of the variance in cerebral arterial pulsatility, before adjustment, whilst 49% of the variance was explained by aortic pulse pressure, arterial stiffness, age, gender and cardiovascular risk factors. Furthermore, arterial stiffness partially mediated the relationship between aortic and cerebral pulsatility. Overall, absolute aortic pressures and cerebral blood flow velocity were poorly correlated but aortic and cerebral pulsatility were strongly related, suggesting a key role for transmission of aortic pulsatility to the brain. 相似文献