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   7124篇
  免费   378篇
  国内免费   24篇
耳鼻咽喉   119篇
儿科学   425篇
妇产科学   77篇
基础医学   766篇
口腔科学   142篇
临床医学   513篇
内科学   1449篇
皮肤病学   237篇
神经病学   394篇
特种医学   123篇
外科学   1103篇
综合类   204篇
一般理论   1篇
预防医学   324篇
眼科学   221篇
药学   657篇
  1篇
中国医学   32篇
肿瘤学   738篇
  2023年   44篇
  2022年   119篇
  2021年   255篇
  2020年   126篇
  2019年   189篇
  2018年   230篇
  2017年   150篇
  2016年   219篇
  2015年   235篇
  2014年   323篇
  2013年   387篇
  2012年   594篇
  2011年   624篇
  2010年   348篇
  2009年   268篇
  2008年   434篇
  2007年   404篇
  2006年   397篇
  2005年   357篇
  2004年   331篇
  2003年   301篇
  2002年   260篇
  2001年   66篇
  2000年   71篇
  1999年   78篇
  1998年   45篇
  1997年   27篇
  1996年   33篇
  1995年   16篇
  1994年   24篇
  1993年   16篇
  1992年   33篇
  1991年   22篇
  1990年   35篇
  1989年   38篇
  1988年   42篇
  1987年   33篇
  1986年   32篇
  1985年   33篇
  1984年   27篇
  1983年   27篇
  1979年   24篇
  1977年   13篇
  1974年   22篇
  1972年   16篇
  1971年   17篇
  1970年   13篇
  1969年   11篇
  1968年   16篇
  1967年   15篇
排序方式: 共有7526条查询结果,搜索用时 15 毫秒
81.
We describe a young patient of acute transverse myelitis (ATM) who developed true lower motor neuron (LMN) type flaccid paraplegia as a result of anterior horn cell damage in the region of cord inflammation that extended from conus upwards up to the D4 transverse level. We infer that flaccidity in acute phase of ATM is not always due to spinal shock and may represent true LMN paralysis particularly if the long segment myelits is severe and extending up to last spinal segment.  相似文献   
82.
83.
84.
ObjectiveTo report a comparative clinical and histopathological study on oliguric and non-oliguric acute renal failure (ARF) in malaria.Method311 consecutive cases of malaria out of which 74 (23.79%) had ARF as per WHO criteria were conducted. Mean age was 32.58 (range 15–60 years) and male: female was 2:1.ResultMost of the cases developed ARF within 10 d of onset. 18 cases (11 falciparum, 2 mixed, 5 vivax) presented with oliguric and 56 (41 falciparum, 6 mixed, 9 vivax) with non-oliguric renal failure. Associated major manifestations were jaundice (75.68%), cerebral malaria (41.89%), bleeding manifestations (32.43%), severe anemia (27.03%), hypotension (25.68%), multi-organ failure (18.92%), severe thrombocytopenia (12.16%), and ARDS (8.11%). Kidney biopsy (n=20) showed acute tubular necrosis (n=7), Mesangioproliferative glomerulonephritis (n=4) or both (n=9). Hemodialysis was done in 8 cases of oliguric renal failure out of which 4 survived (average no. of session 2.9).ConclusionMost of the cases recovered within 3 weeks. Total mortality was 28.38% (n=21) and mortality was more in oliguric renal failure (72.22%) as compare to non-oliguric renal failure (14.29%).  相似文献   
85.

Background

Evaluation of stable symptomatic outpatients with suspected coronary artery disease (CAD) may be challenging because they have a wide range of cardiovascular risk. The role of troponin testing to assist clinical decision making in this setting is unexplored.

Objectives

This study sought to evaluate the prognostic meaning of single-molecule counting high-sensitivity troponin I (hsTnI) (normal range <6 ng/l) among outpatients with stable chest symptoms and suspected CAD.

Methods

Participants with available blood samples in PROMISE (Prospective Multicenter Imaging Study for Evaluation of Chest Pain) were studied, and hsTnI results were analyzed relative to the primary outcome of death, acute myocardial infarction (MI), or hospitalization for unstable angina by 1 year. The secondary outcome was the composite of cardiovascular death or acute MI.

Results

The study sample consisted of 4,021 participants; 98.6% had measurable hsTnI concentrations. The median hsTnI value was 1.6 ng/l. In upper hsTnI quartiles, patients had higher-risk clinical profiles. Higher hsTnI concentrations were associated with greater event probabilities for death, acute MI, or hospitalization for unstable angina. In multivariable models, hsTnI concentrations independently predicted death, acute MI, or hospitalization for unstable angina (hazard ratio: 1.54 per increase in log-hsTnI interquartile range; p < 0.001) and cardiovascular death or acute MI (hazard ratio: 1.52 per increase in log-hsTnI interquartile range; p < 0.001) and were particularly associated with near-term events, compared with longer follow-up.

Conclusions

In symptomatic outpatients with suspected CAD, higher concentrations of hsTnI within the normal range were associated with heightened near-term risk for death, acute MI, or hospitalization. (Prospective Multicenter Imaging Study for Evaluation of Chest Pain [PROMISE]; NCT01174550)  相似文献   
86.
87.
88.
89.
90.
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