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   1277008篇
  免费   99879篇
  国内免费   1988篇
耳鼻咽喉   18430篇
儿科学   44381篇
妇产科学   35011篇
基础医学   182241篇
口腔科学   33590篇
临床医学   111270篇
内科学   258305篇
皮肤病学   28026篇
神经病学   100397篇
特种医学   51210篇
外国民族医学   660篇
外科学   196422篇
综合类   27053篇
现状与发展   1篇
一般理论   377篇
预防医学   95741篇
眼科学   27919篇
药学   94776篇
  2篇
中国医学   2422篇
肿瘤学   70641篇
  2018年   13133篇
  2017年   9965篇
  2016年   10904篇
  2015年   12379篇
  2014年   17173篇
  2013年   26225篇
  2012年   36035篇
  2011年   38066篇
  2010年   22814篇
  2009年   21821篇
  2008年   36650篇
  2007年   39265篇
  2006年   39523篇
  2005年   38457篇
  2004年   37607篇
  2003年   36463篇
  2002年   35814篇
  2001年   64002篇
  2000年   66506篇
  1999年   56421篇
  1998年   15140篇
  1997年   13759篇
  1996年   14197篇
  1995年   13458篇
  1994年   12766篇
  1993年   11790篇
  1992年   44560篇
  1991年   43469篇
  1990年   42220篇
  1989年   40116篇
  1988年   36898篇
  1987年   36236篇
  1986年   33620篇
  1985年   32286篇
  1984年   24144篇
  1983年   20273篇
  1982年   11723篇
  1981年   10692篇
  1980年   9515篇
  1979年   21343篇
  1978年   14823篇
  1977年   12533篇
  1976年   11693篇
  1975年   12623篇
  1974年   14664篇
  1973年   14118篇
  1972年   12946篇
  1971年   11731篇
  1970年   11053篇
  1969年   10028篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
This study used the National Survey of Ambulatory Surgery (NSAS) database to measure the incidence of and risk factors for symptoms in the ambulatory surgery center and problems within 24 h after isolated carpal tunnel release (CTR). The NSAS contained records on 400,000 adult patients with carpal tunnel syndrome who were treated with CTR in 2006, based on ICD-9 codes. The type of anesthesia used and factors associated with symptoms and problems were sought in bivariate and multivariable statistical analyses. The mean duration of the procedure was 16 ± 8.8 min. Only 5 % were performed under local anesthesia without sedation, 45 % with IV sedation, 28 % regional anesthesia, and 19 % general anesthesia. Symptoms in the ambulatory surgery center or a problem within 24 h after discharge were recorded in 10 % of patients, all of them minor and transient, including difficulties with pain and its treatment. The strongest risk factors were male sex, age of 45 years and older, and participation of an anesthesiologist. Local anesthesia and regional anesthesia were associated with more perioperative symptoms and postoperative problems. Most CTR are performed with some sedation in the United States. CTR is a safe procedure: one in 10 patients will experience a minor issue in the perioperative or immediate postoperative period.  相似文献   
63.
Background Immune checkpoint blockers (ICBs) activate CD8+ T cells, eliciting both anti-cancer activity and immune-related adverse events (irAEs). The relationship of irAEs with baseline parameters and clinical outcome is unclear.Methods Retrospective evaluation of irAEs on survival was performed across primary (N = 144) and secondary (N = 211) independent cohorts of patients with metastatic melanoma receiving single agent (pembrolizumab/nivolumab—sICB) or combination (nivolumab and ipilimumab—cICB) checkpoint blockade. RNA from pre-treatment and post-treatment CD8+ T cells was sequenced and differential gene expression according to irAE development assessed.Results 58.3% of patients developed early irAEs and this was associated with longer progression-free (PFS) and overall survival (OS) across both cohorts (log-rank test, OS: P < 0.0001). Median survival for patients without irAEs was 16.6 months (95% CI: 10.9–33.4) versus not-reached (P = 2.8 × 10−6). Pre-treatment monocyte and neutrophil counts, but not BMI, were additional predictors of clinical outcome. Differential expression of numerous gene pathway members was observed in CD8+ T cells according to irAE development, and patients not developing irAEs demonstrating upregulated CXCR1 pre- and post-treatment.Conclusions Early irAE development post-ICB is associated with favourable survival in MM. Development of irAEs is coupled to expression of numerous gene pathways, suggesting irAE development in-part reflects baseline immune activation.Subject terms: Immunotherapy, Melanoma  相似文献   
64.
65.
Jahn  P. 《Der Onkologe》2020,26(11):1040-1046
Die Onkologie - Die Pflegepersonaluntergrenzen als rote Linien zur Abgrenzung einer gefährlichen Pflegepraxis sind nicht geeignet, die dringend benötigte Trendwende einzuleiten und...  相似文献   
66.
67.
68.
69.
70.

Background

Arterial vascular anomalies in patients undergoing kidney transplantation (KT) are correlated with a higher incidence of early surgical complications, potentially causing graft loss. Arterial reconstruction allows patients to overcome these surgical challenges, thus minimizing the risk of poor outcomes. The aim of the present study is to retrospectively investigate the safety and effectiveness of the multiple arterial reconstruction technique with a Teflon patch in case of an unavailable aortic patch: to do so, surgical complications, graft function, and patient survival were evaluated.

Methods

During the period January 2009 to August 2016, 202 adult deceased-donor KTs were performed at our center. Group A (n = 27; reconstruction of multiple arteries) and Group B (n = 175; control group) were compared.

Results

No differences were observed between the 2 groups in terms of early postoperative course, with no vascular complication observed in Group A. No vascular patch infections were reported, nor longer cold ischemia time rates. Similarly, long-term survival rates were similar between the 2 groups.

Conclusions

The Teflon-patch arterial reconstruction technique appears to be safe and effective, with an acceptable balance of benefits and potential risks of using a prosthetic material. Studies based on larger series are needed to further validate this approach.  相似文献   
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