首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   860676篇
  免费   71531篇
  国内免费   1836篇
耳鼻咽喉   12798篇
儿科学   24629篇
妇产科学   25094篇
基础医学   124188篇
口腔科学   25484篇
临床医学   75253篇
内科学   164389篇
皮肤病学   16980篇
神经病学   70044篇
特种医学   35193篇
外国民族医学   171篇
外科学   136149篇
综合类   24600篇
现状与发展   2篇
一般理论   263篇
预防医学   66783篇
眼科学   20513篇
药学   64687篇
中国医学   1593篇
肿瘤学   45230篇
  2018年   7333篇
  2015年   7727篇
  2014年   11109篇
  2013年   16784篇
  2012年   22715篇
  2011年   23828篇
  2010年   13864篇
  2009年   13062篇
  2008年   22572篇
  2007年   24623篇
  2006年   24493篇
  2005年   24138篇
  2004年   23701篇
  2003年   22832篇
  2002年   21923篇
  2001年   35823篇
  2000年   36469篇
  1999年   30900篇
  1998年   9221篇
  1997年   8550篇
  1996年   8477篇
  1995年   8007篇
  1994年   7725篇
  1992年   26661篇
  1991年   26101篇
  1990年   25623篇
  1989年   24681篇
  1988年   23227篇
  1987年   22884篇
  1986年   21743篇
  1985年   21101篇
  1984年   16389篇
  1983年   14000篇
  1982年   8854篇
  1981年   8201篇
  1980年   7672篇
  1979年   16743篇
  1978年   12116篇
  1977年   10181篇
  1976年   9329篇
  1975年   10150篇
  1974年   12645篇
  1973年   12137篇
  1972年   11542篇
  1971年   10691篇
  1970年   10222篇
  1969年   9916篇
  1968年   8903篇
  1967年   8231篇
  1966年   7655篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
Objectives: There is a paucity of reporting on surgical outcomes of isolated posterior cruciate ligament reconstruction (PCLR). We hypothesize that isolated PCL injuries failing nonoperative treatment achieve good outcomes and are able to return to sport following PCLR.

Methods: A retrospective analysis was performed to identify patients with isolated PCL injuries that underwent reconstruction between 2001 and 2014. Patients with multi-ligamentous injury or another concomitant knee pathology were excluded. Medical records were reviewed for demographic, clinical and operative data. Patients were contacted for administration of a telephone-based questionnaire which included the International Knee Documentation Committee (IKDC) Subjective Knee Evaluation form, Lysholm-Tegner scales, Marx activity scale (MAS), return to sport status, and patient satisfaction instruments.

Results: A total of 15 isolated PCL reconstructions in 14 patients with a mean age of 27.5 years (range 17–43) met the study inclusion criteria; mean follow up was 6.3 years (range 1.4–15.2). Pre-operatively, the primary complaint was knee instability in all patients; on physical examination, lack of a firm end point during posterior drawer testing was found in 93% (14/15) of the knees. In total, 12 of 15 knees underwent transtibial, single-bundle PCLR and three of 15 underwent tibial inlay, double bundle PCLR. Graft types included: quadriceps autograft (7/15), Achilles allograft (6/15), and hamstring autograft (2/15). There were no graft failures in our patient cohort. At most recent follow up the mean scores respectively on the IKDC form, Lysholm-Tegner scales and MAS were (standard deviation): 77.3 (16.5), 83.1 (17.9), 6.13 (2.6), and 7.1 (6.0). All fourteen patients were athletes prior to their injury and 79% (11/14) returned to sport and overall patient satisfaction was 9.2/10.

Conclusions: Isolated PCLR provides good outcomes at mean medium-term follow up with restoration of function, high rate of return to sport and overall patient satisfaction.  相似文献   

112.
113.
Luckscheiter  A.  Lohs  T.  Fischer  M.  Zink  W. 《Der Anaesthesist》2020,69(3):170-182
Die Anaesthesiologie - Das Management des schwierigen Atemwegs ist eine präklinische Schlüsselqualifikation. Für Notärzte mit hohem Erfahrungsgrad im Atemwegsmanagement sind...  相似文献   
114.

Purpose

To evaluate the feasibility of a same-day yttrium-90 (90Y) radioembolization protocol with resin microspheres (including pretreatment angiography, lung shunt fraction [LSF] determination, and radioembolization) for the treatment of hepatocellular carcinoma (HCC) and liver metastases.

Materials and Methods

All same-day radioembolization procedures performed over 1 y (February 2017 to January 2018) were included in this single-institutional retrospective analysis, in which 34 procedures were performed in 26 patients (median age, 63 y; 13 women), 19 with liver metastases and 7 with HCC. Yttrium-90 treatment activities were calculated by body surface area method. Tumor imaging response was assessed by Response Evaluation Criteria In Solid Tumors (RECIST) 1.1 for liver metastases and modified RECIST for HCC. Clinical side effects and adverse events were graded per Common Terminology Criteria for Adverse Events version 4.0.

Results

All planned cases were technically successful, and no cases were canceled for elevated LSF or vascular anatomic reasons. Pretreatment angiography modified the planned 90Y treatment activity in 1 case in which vascular anatomy required a lobar-dose split into 2 for segmental infusions. In 18% of cases, patients were briefly admitted after the procedure for observation or symptom management. Imaging evaluation of initial efficacy at 1 month demonstrated partial response in 25% and stable disease in 67% of patients with liver metastases and partial/complete response in 43% and stable disease in 14% of patients with HCC. Grade ≥ 3 adverse events occurred in 6% of cases, with no systemic therapy–limiting toxicities. The mean total procedure time was 4.2 hours.

Conclusions

A same-day 90Y radioembolization protocol with resin microspheres is feasible in select patients, which can expedite cancer therapy.  相似文献   
115.
116.
117.
118.
119.
It was an honor for me to present the 2014 G. Heiner Sell Memorial Lecture at the annual American Spinal Injury Association (ASIA) meeting in San Antonio. For this purpose, I provided a comprehensive review of the scope of research targeting discovery and translational and clinical investigations into spinal cord injury (SCI) research. Indeed, these are exciting times in the area of spinal cord research and clinical initiatives. Many laboratories and clinical programs throughout the world are publishing data related to the pathophysiology of SCI and new strategies for protecting and promoting recovery in both animal models and humans. For this lecture, several topics were discussed including neuroprotective and reparative strategies, neurorehabilitation, quality of life issues, and future directions. In the area of neuroprotection, pathophysiological events that may be targeted with therapeutic strategies, including pharmacological and targeted temperature management were reviewed. For reparative approaches, the importance of both intrinsic and extrinsic mechanisms of axonal regeneration was highlighted. Various cell therapies currently being tested in preclinical and clinical arenas were reviewed as well as ongoing US Food and Drug Administration approved trials for SCI patients. Neurorehabilitation is an evolving research field with locomotive training strategies, electrical stimulation, and brain-machine interface programs targeting various types of SCI. The importance of testing combination approaches including neuroprotective, reparative, and rehabilitative strategies to maximize recovery mechanisms was therefore emphasized. Finally, quality of life issues that affect thousands of individuals living with paralysis were also presented. Future directions and specific obstacles that require attention as we continue to move the SCI field forward were discussed.  相似文献   
120.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号