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   1883篇
  免费   79篇
  国内免费   9篇
耳鼻咽喉   13篇
儿科学   72篇
妇产科学   31篇
基础医学   212篇
口腔科学   55篇
临床医学   149篇
内科学   368篇
皮肤病学   35篇
神经病学   78篇
特种医学   176篇
外科学   168篇
综合类   125篇
预防医学   105篇
眼科学   80篇
药学   183篇
中国医学   9篇
肿瘤学   112篇
  2023年   13篇
  2022年   42篇
  2021年   58篇
  2020年   41篇
  2019年   51篇
  2018年   60篇
  2017年   29篇
  2016年   43篇
  2015年   50篇
  2014年   56篇
  2013年   73篇
  2012年   121篇
  2011年   119篇
  2010年   81篇
  2009年   73篇
  2008年   103篇
  2007年   93篇
  2006年   65篇
  2005年   59篇
  2004年   62篇
  2003年   53篇
  2002年   47篇
  2001年   60篇
  2000年   53篇
  1999年   57篇
  1998年   40篇
  1997年   22篇
  1996年   22篇
  1995年   11篇
  1994年   15篇
  1993年   14篇
  1992年   19篇
  1991年   28篇
  1990年   21篇
  1989年   30篇
  1988年   24篇
  1987年   18篇
  1986年   15篇
  1985年   18篇
  1984年   11篇
  1983年   12篇
  1979年   15篇
  1977年   9篇
  1976年   8篇
  1975年   11篇
  1974年   7篇
  1973年   4篇
  1972年   6篇
  1971年   4篇
  1968年   5篇
排序方式: 共有1971条查询结果,搜索用时 15 毫秒
51.

Background and objectives

Percutaneous catheter drainage (PCD) is used as a first step in the management of symptomatic fluid collections in patients with acute pancreatitis (AP). We aimed to compare the outcome of patients with acute necrotic collection (ANC) and those with walled-off necrosis (WON), who had undergone PCD as a part of management of AP.

Methods

Consecutive patients of AP with symptomatic ANC or WON undergoing PCD were evaluated. Primary outcome measures were need for additional surgical necrosectomy and mortality. Secondary outcome measures were need for up-gradation of first PCD, need for additional drain, in-hospital as well as total duration of PCD and length of hospital stay.

Results

Indications of PCD in 375 patients (258 with ANC and 117 with WON) were suspected infected pancreatic necrosis (n?=?214), persistent organ failure (n?=?117) and pressure symptoms (n?=?44). Need for additional surgical necrosectomy was seen in 14% patients with ANC and in 12% of patients with WON (p?=?0.364) and mortality was 19% in patients with ANC as compared to 13.7% in those with WON (p?=?0.132). There was no significant difference in the secondary outcome parameters between patients who underwent PCD for ANC or WON. Complications of PCD were comparable between patients with ANC and WON except development of external pancreatic fistula which occurred more often in patients with WON than in those with ANC (24.4% versus 34.2% respectively, p?=?0.034).

Conclusion

Persistent organ failure in more often an indication of PCD in patients with ANC than in WON and suspected infection is more commonly an indication in WON than in ANC. Early PCD is as efficacious and safe as delayed PCD.  相似文献   
52.
We report the first case of echocardiographically detected Lambl's excrescences on the pulmonary valve in a 72-year-old man who was referred for transesophageal echocardiography as a part of an evaluation for ischemic stroke. A total of four excrescences were noted on the arterial aspect of the pulmonary valve; two of them were on the anterior cusp, one was on the left cusp, and one was on the right cusp. The excrescence on the left cusp was the largest, measuring 5 mm in length. These valvular strands (Lambl's excrescences) represented an incidental finding and were not associated with any disease process.  相似文献   
53.
54.
55.
Inflammation Research - Non-alcoholic fatty liver disease (NAFLD) is a multifaceted disease allied with various metabolic disorders, obesity and dysbiosis. Gut microbiota plays an influential role...  相似文献   
56.
57.

Background:

To evaluate and compare the ultrasound (US) features of transient small bowel intussusception (SBI) with those which required surgical management.

Materials and Methods:

US features of 26 children with 32 intussusceptions from January 2014 to August 2014 were recorded and compared with follow-up imaging or surgical findings.

Results:

Transient SBI when compared to surgically managed intussusception has shorter length of intussusception (mean 2.25 cm, range 1.8-4.5 cm vs. mean 5.6 cm, range, 2.3-7.8 cm), smaller transverse diameter (mean, 1.2 cm, range 0.8-2.3 cm vs. mean, 3.3 cm, range 2.9-5.4 cm) and thin wall (mean, 3.3 mm, 2.3-4.9 mm vs. mean, 6.8 mm, range, 4.3-11.2 mm). Four out of five surgically managed intussusceptions were associated with the lead point while none of the transient SBI had any lead point. Peristalsis was absent in all surgically managed intussusceptions.

Conclusion:

Transient SBI is associated with a shorter length of intussusception, smaller transverse diameter, thin walls, absence of the lead point and visible peristalsis. All these findings may help in distinguishing it from those requiring surgical management.Key words: Children, surgically managed small bowel intussusception, transient small bowel intussusception, ultrasound  相似文献   
58.
We investigated the prostate cancer detection rates upon transrectal ultrasound (TRUS)-guided biopsy in relation to digital rectal examination (DRE) and prostate-specific antigen (PSA), and risk factors of prostate cancer detection in the Chinese population. Data from all consecutive Chinese men who underwent first TRUS-guided prostate biopsy from year 2000 to 2013 was retrieved from our database. The prostate cancer detection rates with reference to DRE finding and PSA level of < 4, 4–10, 10.1–20, 20.1–50 and > 50 ng ml−1 were investigated. Multivariate logistic regression analyses were performed to investigate for potential risk factors of prostate cancer detection. A total of 2606 Chinese men were included. In patients with normal DRE, the cancer detection rates were 8.6%, 13.4%, 21.8%, 41.7% and 85.2% in patients with PSA < 4, 4–10, 10.1–20, 20.1–50 and > 50 ng ml−1 respectively. In patients with abnormal DRE, the cancer detection rates were 12.4%, 30.2%, 52.7%, 80.6% and 96.4% in patients with PSA < 4, 4–10, 10.1–20, 20.1–50 and > 50 ng ml−1 respectively. Older age, smaller prostate volume, larger number of biopsy cores, presence of abnormal DRE finding and higher PSA level were associated with increased risk of prostate cancer detection upon multivariate logistic regression analyses (P < 0.001). Chinese men appeared to have lower prostate cancer detection rates when compared to the Western population. Taking the different risk factors into account, an individualized approach to the decision of TRUS-guided biopsy can be adopted.  相似文献   
59.
This article is a continuation of our previously published annual reviews of transcatheter aortic valve replacement (TAVR). In 2017, TAVR further established a foothold in the management of intermediate risk patients with the publication of SURTAVI trial. Randomized trials also addressed the use of cerebral protection during TAVR and single versus dual antiplatelet therapy after TAVR. Newer generation valve systems continued to be studied for their efficacy and safety. This paper summarizes the major studies published in 2017.
  相似文献   
60.
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