全文获取类型
收费全文 | 982670篇 |
免费 | 70635篇 |
国内免费 | 1934篇 |
专业分类
耳鼻咽喉 | 13896篇 |
儿科学 | 24925篇 |
妇产科学 | 24007篇 |
基础医学 | 142011篇 |
口腔科学 | 29534篇 |
临床医学 | 85079篇 |
内科学 | 192946篇 |
皮肤病学 | 21036篇 |
神经病学 | 75848篇 |
特种医学 | 39606篇 |
外国民族医学 | 79篇 |
外科学 | 158969篇 |
综合类 | 18237篇 |
现状与发展 | 2篇 |
一般理论 | 250篇 |
预防医学 | 64199篇 |
眼科学 | 22473篇 |
药学 | 77293篇 |
3篇 | |
中国医学 | 2776篇 |
肿瘤学 | 62070篇 |
出版年
2021年 | 7610篇 |
2018年 | 10569篇 |
2017年 | 8216篇 |
2016年 | 9461篇 |
2015年 | 11352篇 |
2014年 | 14963篇 |
2013年 | 20866篇 |
2012年 | 29248篇 |
2011年 | 29712篇 |
2010年 | 17526篇 |
2009年 | 16564篇 |
2008年 | 27862篇 |
2007年 | 28666篇 |
2006年 | 28996篇 |
2005年 | 27671篇 |
2004年 | 26494篇 |
2003年 | 25224篇 |
2002年 | 24511篇 |
2001年 | 55808篇 |
2000年 | 57548篇 |
1999年 | 47662篇 |
1998年 | 11056篇 |
1997年 | 9699篇 |
1996年 | 9776篇 |
1995年 | 9078篇 |
1994年 | 8403篇 |
1993年 | 7710篇 |
1992年 | 35751篇 |
1991年 | 34161篇 |
1990年 | 32955篇 |
1989年 | 32079篇 |
1988年 | 29201篇 |
1987年 | 28450篇 |
1986年 | 26432篇 |
1985年 | 25267篇 |
1984年 | 17919篇 |
1983年 | 15232篇 |
1982年 | 7838篇 |
1979年 | 15849篇 |
1978年 | 10659篇 |
1977年 | 9087篇 |
1976年 | 7911篇 |
1975年 | 8673篇 |
1974年 | 10519篇 |
1973年 | 9900篇 |
1972年 | 9404篇 |
1971年 | 8887篇 |
1970年 | 8473篇 |
1969年 | 7941篇 |
1968年 | 7228篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
Hassen Lena M. Albarrak Rana A. Albahlal Reem A. Alsaqabi Dimah K. Hassen Ikhlass M. Daghestani Maha H. Alqurtas Eman M. Alkhalaf Abdulaziz T. Bedaiwi Mohammed K. Omair Mohammed A. Almaghlouth Ibrahim A. 《Quality of life research》2022,31(11):3229-3239
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional... 相似文献
3.
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
4.
5.
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
6.
Brittney H. Cotta Margaret F. Meagher Aaron Bradshaw Stephen T. Ryan Gerant Rivera-Sanfeliz 《Expert review of anticancer therapy》2019,19(4):301-308
Introduction: Percutaneous renal mass biopsy has evolved over the last decade with improvements on previous pitfalls including low tissue yield, high non-diagnostic rates, and complications. As understanding of tumor biology and natural history of renal cortical neoplasms has improved, percutaneous renal mass biopsy is poised to have an expanding role in an area characterized by individualized management and refined risk stratification.
Areas covered: This review summarizes the evolution of renal mass biopsy to its current state with respect to outcomes, indications, and clinical guidelines.
Expert opinion: With improved understanding of differential biological potential of renal cortical neoplasms combined with technical improvements in diagnostic yield and accuracy, utilization of renal mass biopsy is becoming an important adjunct to patient care in a broad range of clinical scenarios, including active surveillance, thermal ablation, and use of primary systemic therapy in localized and advanced settings. 相似文献
7.
Moderate sedatives have been increasingly used to improve patient comfort during flexible bronchoscopy (FB). However, routine use of moderate sedation during FB is controversial because its efficacy and safety are not well established.This study aims to evaluate the efficacy and safety of moderate sedation during FB.A search was made of Medline, EMBASE, and the Cochrane Library to May 2014.Randomized controlled trials (RCTs) and quasi-RCTs were included.The main analysis was designed to examine the efficacy of moderate sedation during FB in sedation than no-sedation.The willingness to repeat FB was significantly more in sedation than no-sedation (odds ratio [OR] 2.30; 95% confidence interval [CI] 1.11–4.73; P = 0.02; I2 = 22.5). The duration of FB was shorter in sedation group than no-sedation group (standardized mean difference [SMD] −0.21; 95% CI −0.38 to −0.03; P = 0.02; I2 = 78.3%). Event of hypoxia was not significantly different between sedation and no-sedation groups (OR 0.86; 95% CI 0.42–1.73; P = 0.67; I2 = 0%). The SpO2 during procedure was not different between sedation and no-sedation groups (SMD −0.14; 95% CI −0.37 to 0.08; P = 0.21; I2 = 49.9%). However, in subgroup analysis without supplemental oxygen, the SpO2 was significantly lower in sedation than no-sedation group (SMD −0.45; 95% CI −0.78 to −0.11; P = 0.01; I2 = 0.0%).According to this meta-analysis, moderate sedation in FB would be useful in patients who will require repeated bronchoscopies as well as safe in respiratory depression. To our knowledge, although the various sedative drugs are already used in the real field, this analysis was the first attempt to quantify objective results. We anticipate more definite and studies designed to elucidate standardized outcomes for moderate sedation in FB. 相似文献
8.
9.
10.
Stepanova E. S. Makarenkova L. M. Chistyakov V. V. Rybakov Yu. L. Gukasov V. M. Fedotcheva T. A. Parshin V. A. Votyakov V. A. Shimanovskii N. L. 《Pharmaceutical Chemistry Journal》2019,52(12):1016-1020
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was... 相似文献