全文获取类型
收费全文 | 243212篇 |
免费 | 17696篇 |
国内免费 | 931篇 |
专业分类
耳鼻咽喉 | 2687篇 |
儿科学 | 6602篇 |
妇产科学 | 5290篇 |
基础医学 | 30404篇 |
口腔科学 | 5683篇 |
临床医学 | 22766篇 |
内科学 | 51536篇 |
皮肤病学 | 3410篇 |
神经病学 | 22308篇 |
特种医学 | 8169篇 |
外国民族医学 | 17篇 |
外科学 | 39330篇 |
综合类 | 4205篇 |
现状与发展 | 5篇 |
一般理论 | 318篇 |
预防医学 | 21173篇 |
眼科学 | 5657篇 |
药学 | 17129篇 |
2篇 | |
中国医学 | 629篇 |
肿瘤学 | 14519篇 |
出版年
2023年 | 1099篇 |
2022年 | 855篇 |
2021年 | 4869篇 |
2020年 | 3065篇 |
2019年 | 4607篇 |
2018年 | 5501篇 |
2017年 | 4319篇 |
2016年 | 4606篇 |
2015年 | 5357篇 |
2014年 | 7725篇 |
2013年 | 10810篇 |
2012年 | 16122篇 |
2011年 | 17213篇 |
2010年 | 9732篇 |
2009年 | 8729篇 |
2008年 | 15750篇 |
2007年 | 16640篇 |
2006年 | 15872篇 |
2005年 | 16108篇 |
2004年 | 15351篇 |
2003年 | 14197篇 |
2002年 | 13565篇 |
2001年 | 2232篇 |
2000年 | 1759篇 |
1999年 | 2319篇 |
1998年 | 3012篇 |
1997年 | 2563篇 |
1996年 | 2342篇 |
1995年 | 2045篇 |
1994年 | 1803篇 |
1993年 | 1676篇 |
1992年 | 1310篇 |
1991年 | 1304篇 |
1990年 | 1167篇 |
1989年 | 1061篇 |
1988年 | 1086篇 |
1987年 | 1095篇 |
1986年 | 1067篇 |
1985年 | 1177篇 |
1984年 | 1509篇 |
1983年 | 1475篇 |
1982年 | 1820篇 |
1981年 | 1654篇 |
1980年 | 1555篇 |
1979年 | 829篇 |
1978年 | 967篇 |
1977年 | 935篇 |
1976年 | 839篇 |
1975年 | 696篇 |
1974年 | 690篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
71.
Evaluation of training nurses to perform semi‐automated three‐dimensional left ventricular ejection fraction using a customised workstation‐based training protocol 下载免费PDF全文
72.
Effects of Paclitaxel and Carboplatin Combination on Mechanical Myocardial and Microvascular Functions: A Transthoracic Doppler Echocardiography and Two‐Dimensional Strain Imaging Study 下载免费PDF全文
73.
74.
Sharisse M. Arnold Rehring Liza M. Reifler Jennifer H. Seidel Karen A. Glenn John F. Steiner 《Academic pediatrics》2019,19(5):572-580
ObjectiveClinical specialty societies recommend long-acting reversible contraceptives (LARCs) as first-line contraception for adolescent women. We evaluated whether a combined educational and process improvement intervention enhanced LARC placement in primary care within an integrated health care system.MethodsThe intervention included journal clubs, live continuing education, point-of-care guidelines, and new patient materials. We conducted a retrospective cohort study across 3 time periods: baseline (January 2013?September 2015), early implementation (October 2015–March 2016), and full implementation (April 2016–June 2017). The primary outcome was the proportion of LARCs placed by primary care clinicians among women aged 13 to 18 years compared with gynecology clinicians.ResultsKaiser Foundation Health Plan of Colorado cared for approximately 20,000 women aged 13 to 18 years in each calendar quarter between 2013 and 2017. Overall, LARC placement increased from 7.0 per 1000 members per quarter at baseline to 13.0 per 1000 during the full intervention. Primary care clinicians placed 6.2% of all LARCs in 2013, increasing to 32.1% by 2017 (P < .001), including 45.5% of contraceptive implants. Clinicians who attended educational sessions were more likely to adopt LARCs than those who did not (17.9% vs 6.4% respectively, P = .009). Neither overall LARC placement rates (relative risk, 1.9; 95% confidence interval, 0.7?5.6) nor contraceptive implant rates (relative risk, 3.0; 95% confidence interval, 0.9?9.8) increased significantly in clinicians who attended educational activities.ConclusionsThis multimodal intervention was associated with increased LARC placement for adolescent women in primary care. The combination of education and process improvement is a promising strategy to promote clinician behavior change. 相似文献
75.
76.
Background and study aims
Acute upper gastrointestinal bleeding is one of the main causes of hospitalisation. The purpose of this study was to determine the prognostic factors in non-variceal upper gastrointestinal bleeding.Patients and methods
Clinical outcomes, demographic and laboratory variables of the subjects were collected from the HIS software and national code with the SQL format from three hospitals in Qazvin. The data were linked to the database software designed by the author. Clinical and upper endoscopic findings of patients’ records were collected through a questionnaire form in the designed software database.Results
In this study, 29.2% of patients with favourable outcome and 64.2% of patients with unfavourable clinical outcomes had a history of anticoagulant drug use before hospitalisation (p?<?0.001). The prevalence of chronic cardiovascular disease, chronic liver disease, chronic lung disease, diabetes and dialysis was higher in subjects with poor clinical outcomes than those with a favourable clinical outcome.53.1% of subjects with favourable clinical outcome and 90.5% of subjects with undesirable clinical outcomes received packed red blood cell transfusion (p?<?0.001). 16.1% of subjects with desirable clinical outcome and 86.3% of subjects with undesirable clinical outcomes received endoscopic haemostatic treatment which was statistically significant (p?<?0.001).Conclusion
Undesirable clinical outcome in patients with acute non-variceal upper gastrointestinal bleeding has a significant statistical association with longer hospitalisation, chronic underlying disease, anticoagulant administration, packed red blood cell infusion, higher Forrest stage, low systolic blood pressure, higher age, low haemoglobin, low platelet count, high INR and high BUN at the onset of diagnosis. 相似文献77.
78.
79.
John Lennon Silva Cunha Amanda Almeida Leite Thamiris de Castro Abrantes Lorena Passoni Vervloet Thayn Melo de Lima Morais Gerson de Oliveira Paiva Neto Tatiana Nayara Librio Kimura Snia Maria Soares Ferreira Ricardo Luiz Cavalcanti de Albuquerque‐Júnior Aline Corrêa Abraho Mario Jos Romaach Bruno Augusto Benevenuto de Andrade Oslei Paes de Almeida Ciro Dantas Soares 《Journal of cutaneous pathology》2021,48(1):24-33
80.
Altan Ahmed John A. Stauffer Jordan D. LeGout Justin Burns Kristopher Croome Ricardo Paz-Fumagalli Gregory Frey Beau Toskich 《Journal of gastrointestinal oncology.》2021,12(2):751
BackgroundNeoadjuvant yttrium-90 transarterial radioembolization (TARE) is increasingly being used as a strategy to facilitate resection of otherwise unresectable tumors due to its ability to generate both tumor response and remnant liver hypertrophy. Perioperative outcomes after the use of neoadjuvant lobar TARE remain underinvestigated.MethodsA single center retrospective review of patients who underwent lobar TARE prior to major hepatectomy for primary or metastatic liver cancer between 2007 and 2018 was conducted. Baseline demographics, radioembolization parameters, pre- and post-radioembolization volumetrics, intra-operative surgical data, adverse events, and post-operative outcomes were analyzed.ResultsTwenty-six patients underwent major hepatectomy after neoadjuvant lobar TARE. The mean age was 58.3 years (17–88 years). 62% of patients (n=16) had primary liver malignancies while the remainder had metastatic disease. Liver resection included right hepatectomy or trisegmentectomy, left or extended left hepatectomy, and sectorectomy/segmentectomy in 77% (n=20), 8% (n=2), and 15% (n=4) of patients, respectively. The mean length of stay was 8.3 days (range, 3–33 days) and there were no grade IV morbidities or 90-day mortalities. The incidence of post hepatectomy liver failure (PHLF) was 3.8% (n=1). The median time to progression after resection was 4.5 months (range, 3.3–10 months). Twenty-three percent (n=6) of patients had no recurrence. The median survival was 28.9 months (range, 16.9–46.8 months) from major hepatectomy and 37.6 months (range, 25.2–53.1 months) from TARE.ConclusionsMajor hepatectomy after neoadjuvant lobar radioembolization is safe with a low incidence of PHLF. 相似文献