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   2012篇
  免费   117篇
  国内免费   77篇
耳鼻咽喉   2篇
儿科学   171篇
妇产科学   27篇
基础医学   227篇
口腔科学   58篇
临床医学   260篇
内科学   496篇
皮肤病学   75篇
神经病学   61篇
特种医学   392篇
外科学   89篇
综合类   44篇
预防医学   92篇
眼科学   19篇
药学   84篇
  2篇
肿瘤学   107篇
  2023年   4篇
  2022年   6篇
  2021年   12篇
  2020年   16篇
  2019年   15篇
  2018年   33篇
  2017年   23篇
  2016年   23篇
  2015年   41篇
  2014年   47篇
  2013年   59篇
  2012年   36篇
  2011年   40篇
  2010年   88篇
  2009年   87篇
  2008年   56篇
  2007年   90篇
  2006年   52篇
  2005年   54篇
  2004年   24篇
  2003年   21篇
  2002年   27篇
  2001年   36篇
  2000年   29篇
  1999年   28篇
  1998年   128篇
  1997年   155篇
  1996年   131篇
  1995年   108篇
  1994年   114篇
  1993年   97篇
  1992年   28篇
  1991年   35篇
  1990年   36篇
  1989年   54篇
  1988年   46篇
  1987年   42篇
  1986年   49篇
  1985年   45篇
  1984年   26篇
  1983年   15篇
  1982年   24篇
  1981年   29篇
  1980年   25篇
  1979年   4篇
  1978年   8篇
  1977年   18篇
  1976年   25篇
  1975年   14篇
  1966年   1篇
排序方式: 共有2206条查询结果,搜索用时 93 毫秒
991.

Introduction  

In order to minimize the additional risk of interhospital transport of critically ill patients, we started a mobile intensive care unit (MICU) with a specialized retrieval team, reaching out from our university hospital-based intensive care unit to our adherence region in March 2009. To evaluate the effects of this implementation, we performed a prospective audit comparing adverse events and patient stability during MICU transfers with our previous data on transfers performed by standard ambulance.  相似文献   
992.
993.
We aimed to explore the real experience of patients after liver transplantation in the intensive care unit (ICU).Objective sampling method was used to select patients transferred to the ICU in 10 hospitals in Zhuhai from May 2018 to August 2020. Patients need liver transplantation due to advanced liver cancer and decompensated cirrhosis. The eligibility criteria of patients mainly included liver transplant patients who were clear-minded and willing to participate in the study and had stayed in ICU. Phenomenological research methods and in-depth interviews were used in this qualitative study.The results showed that the true experience of patients after liver transplantation during ICU stay was summarized into four themes. The strengths of our qualitative research are that we can find the trend from a phenomenon through interviews and other methods to provide a directional foundation for future quantitative research. Its limitations are that it requires a lot of manpower and time, and its objectivity and universality are limited.Hospitalization experience in the ICU may lead to many negative experiences for liver transplant patients. Nurses should fully understand and pay attention to the psychological changes in patients. Nurses should take effective targeted measures to reduce or eliminate patients’ fear of ICU stay and promote rehabilitation.  相似文献   
994.

Background

Depression is a common complication in type 2 diabetes (DM2), affecting 10-30% of patients. Since depression is underrecognized and undertreated, it is important that reliable and validated depression screening tools are available for use in patients with DM2. The Edinburgh Depression Scale (EDS) is a widely used method for screening depression. However, there is still debate about the dimensionality of the test. Furthermore, the EDS was originally developed to screen for depression in postpartum women. Empirical evidence that the EDS has comparable measurement properties in both males and females suffering from diabetes is lacking however.

Methods

In a large sample (N = 1,656) of diabetes patients, we examined: (1) dimensionality; (2) gender-related item bias; and (3) the screening properties of the EDS using factor analysis and item response theory.

Results

We found evidence that the ten EDS items constitute a scale that is essentially one dimensional and has adequate measurement properties. Three items showed differential item functioning (DIF), two of them showed substantial DIF. However, at the scale level, DIF had no practical impact. Anhedonia (the inability to be able to laugh or enjoy) and sleeping problems were the most informative indicators for being able to differentiate between the diagnostic groups of mild and severe depression.

Conclusions

The EDS constitutes a sound scale for measuring an attribute of general depression. Persons can be reliably measured using the sum score. Screening rules for mild and severe depression are applicable to both males and females.  相似文献   
995.
996.
2004年,罗非昔布(万络)因致心血管疾病风险而撤市。市场上能增加心血管疾病风险的相关药物和环氧合酶(COX-2)抑制剂以及非选择性非甾体抗炎药(NSAID)也遭到质疑。本文论述是否新的证据能改进现有的临床实践和监管条例。过多的抑制COX-2会增加心血管疾病的发生风险,除非同时对血小板血栓素合成的抑制达95%以上,这可通过全血分析检测。最近研究证实,对乙酰氨基酚(扑热息痛)也是一种COX-2选择性抑制剂。流行病学调查指出,对乙酰氨基酚作为一种易得的非处方药物,也存在增加心血管事件的风险。目前尚无足够证据认为罗非昔布的替代药品是安全的。对NSAID的药品监管及处方应遵循“首要不伤害”的预警性原则,药品应强制性加注此类药物心血管风险的告示,以警示处方者和患者。  相似文献   
997.
同型半胱氨酸(Hcy)是蛋氨酸代谢中间产物,是一种含硫基的氨基酸。1964年Gibson等首先报道高同型半胱氨酸血症与血管性疾病和血栓形成相关,1969年Mcully提出Hcy可能与动脉粥样硬化有关。随着近30年的深入研究,众多资料表明高Hcy血症(hHcy)是心脑血管病变的一个独立危险因素。  相似文献   
998.

INTRODUCTION

Introducing laparoscopic colorectal surgery is a challenge to the whole surgical team. It is usual for an assistant to hold the laparoscope and be responsible for the surgeon''s view of the operative field and a lack of expertise in the assistant can add significant difficulties. The EndoAssist™ is a robotic device that replaces the human assistant and ensures steady visualisation of the operative field and a view which can be controlled by the surgeon. This study describes its use in the introduction of laparoscopic colorectal surgery to a unit.

PATIENTS AND METHODS

The EndoAssist was employed for the introduction of laparoscopic colorectal surgery in a unit with previous experience of this device for laparoscopic cholecystectomy. It was used in a consecutive series of 77 laparoscopic colectomy operations.

RESULTS

The robotic device proved successful in the whole range of colorectal operations and a reliable assistant. No problems specific to the device were encountered.

CONCLUSIONS

The EndoAssist robot is a useful laparoscopic assistant and aided in the introduction of laparoscopic colorectal surgery.  相似文献   
999.
1000.

Objectives

The aim of the study was to explore the awareness of rectal microbicides, the use of pre‐exposure prophylaxis (PREP) and the willingness to participate in biomedical HIV prevention trials in a cohort of HIV‐negative gay men.

Methods

In a community‐based cohort study, HIV‐negative homosexually active men in Sydney, Australia were questioned about awareness of rectal microbicides, use of PREP, and willingness to participate in trials of such products. Predictors of awareness and willingness to participate were analysed by logistic regression. Use of PREP was examined prospectively.

Results

Overall, 14% had heard of rectal microbicides. Older (P=0.05) and university‐educated men (P=0.001) were more likely to have knowledge of rectal microbicides. Almost one‐quarter (24%) of men reported that they were likely/very likely to participate in rectal microbicide trials. Among those men with definite opinions on participation, awareness of rectal microbicides was significantly associated with unwillingness to participate [odds ratio (OR) 0.78, 95% confidence interval (CI) 0.65–0.93, P=0.007]. Willingness to participate in trials using antiretroviral drugs (ARVs) to prevent HIV infection was reported by 43% of men, and was higher among those who reported unprotected anal intercourse (UAI) with HIV‐positive partners (OR 1.88, 95% CI 0.99–3.56). There was no evidence of current PREP use.

Conclusions

This study demonstrates that Australian gay men have had little experience with PREP use and rectal microbicides. About half would be willing to consider participation in trials using ARVs to prevent HIV infection. Extensive community education and consultation would be required before PREP or rectal microbicides could be trialled in populations of gay Australian men.
  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