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   1104篇
  免费   62篇
  国内免费   9篇
耳鼻咽喉   11篇
儿科学   73篇
妇产科学   11篇
基础医学   94篇
口腔科学   31篇
临床医学   104篇
内科学   276篇
皮肤病学   21篇
神经病学   21篇
特种医学   243篇
外科学   69篇
综合类   58篇
预防医学   61篇
眼科学   20篇
药学   37篇
中国医学   9篇
肿瘤学   36篇
  2021年   4篇
  2020年   6篇
  2019年   10篇
  2018年   13篇
  2017年   10篇
  2016年   7篇
  2015年   19篇
  2014年   38篇
  2013年   63篇
  2012年   29篇
  2011年   30篇
  2010年   38篇
  2009年   62篇
  2008年   31篇
  2007年   47篇
  2006年   30篇
  2005年   27篇
  2004年   22篇
  2003年   14篇
  2002年   21篇
  2001年   14篇
  2000年   14篇
  1999年   15篇
  1998年   78篇
  1997年   53篇
  1996年   63篇
  1995年   44篇
  1994年   49篇
  1993年   44篇
  1992年   9篇
  1991年   5篇
  1990年   11篇
  1989年   39篇
  1988年   27篇
  1987年   25篇
  1986年   19篇
  1985年   12篇
  1984年   16篇
  1983年   15篇
  1982年   14篇
  1981年   20篇
  1980年   13篇
  1979年   8篇
  1978年   9篇
  1977年   16篇
  1976年   8篇
  1975年   11篇
  1973年   2篇
  1955年   1篇
排序方式: 共有1175条查询结果,搜索用时 15 毫秒
1.
Stroke mortality and morbidity is expected to rise. Despite considerable recent advances within acute ischemic stroke treatment, scope remains for development of widely applicable neuroprotective agents. Glucagon-like peptide-1 receptor agonists (GLP-1RAs), originally licensed for the management of Type 2 Diabetes Mellitus, have demonstrated pre-clinical neuroprotective efficacy in a range of neurodegenerative conditions. This systematic scoping review reports the pre-clinical basis of GLP-1RAs as neuroprotective agents in acute ischemic stroke and their translation into clinical trials. We included 35 pre-clinical studies, 11 retrospective database studies, 7 cardiovascular outcome trials and 4 prospective clinical studies. Pre-clinical neuroprotection was demonstrated in normoglycemic models when administration was delayed by up to 24 h following stroke induction. Outcomes included reduced infarct volume, apoptosis, oxidative stress and inflammation alongside increased neurogenesis, angiogenesis and cerebral blood flow. Improved neurological function and a trend towards increased survival were also reported. Cardiovascular outcomes trials reported a significant reduction in stroke incidence with semaglutide and dulaglutide. Retrospective database studies show a trend towards neuroprotection. Prospective interventional clinical trials are on-going, but initial indicators of safety and tolerability are favourable. Ultimately, we propose that repurposing GLP-1RAs is potentially advantageous but appropriately designed trials are needed to determine clinical efficacy and cost-effectiveness.  相似文献   
2.
3.
BACKGROUNDThere has been an increase in cases of inflammatory bowel disease (IBD) in recent years. There is also greater access and availability of immunosuppressive and biological agents, which increase the risk of opportunistic infection despite improving the quality of life and promoting mucosal healing. Tuberculosis (TB) remains a public health problem, and it has a high incidence in several countries. Therefore, knowledge of the risk of developing TB in patients with IBD is important.AIMTo evaluate the risk of active TB in patients with IBD under treatment from an endemic area in Latin America.METHODSA standard questionnaire included demographic variables, clinical aspects of IBD disease, history of active TB during treatment, active TB characteristics and evolution, initial screening and results and time from the start of anti-tumor necrosis factor alpha (TNFα) to TB development.RESULTSAzathioprine, anti-TNFα and the combination of these two drugs were associated with a higher risk of active TB incidence. The TNFα blockers increased the relative risk of developing active TB compared to other treatments. All four multivariable models showed that the use of TNFα blockers alone or in combination with azathioprine was an important risk factor for the incidence of active TB. After adjustment for sex, age, type of IBD and latent TB, anti-TNFα with azathioprine increased the relative risk to 17.8 times more than conventional treatment. Late TB, which was diagnosed 3 mo after the start of anti-TNFα, was the most frequent.CONCLUSIONTreatment with anti-TNFα increased the risk of active TB in IBD patients from an endemic area in Latin America. This risk was increased when anti-TNFα was combined with azathioprine. The time from the beginning of the treatment to the active TB diagnosis suggests a new TB infection.  相似文献   
4.
Fetal persistent middle cerebral artery reversed end diastolic flow is a rare and ominous finding. Previous cases have been associated with intracranial hemorrhage, growth restriction, anaemia, and hepatic anomaly. Intrauterine demise or early neonatal death is a common outcome. We report the case of persistent middle cerebral artery reversed end diastolic flow in a well-grown fetus at 32 weeks’ gestation resulting from acute, severe anaemia due to a large feto-maternal hemorrhage. An emergency cesarean section was performed and the neonate required advanced resuscitation and immediate blood transfusion. Postnatal magnetic resonance imaging confirmed a hemorrhagic parietal infarct and bilateral ischaemic changes in the basal ganglia. This provides further evidence that persistent middle cerebral artery reversed end diastolic flow in any fetus is an ominous finding warranting urgent diagnostic evaluation and/or delivery.  相似文献   
5.
IntroductionMuch controversy exists on the effect of a fresh frozen plasma (FFP) transfusion on systemic inflammation and endothelial damage. Adverse effects of FFP have been well described, including acute lung injury. However, it is also suggested that a higher amount of FFP decreases mortality in trauma patients requiring a massive transfusion. Furthermore, FFP has an endothelial stabilizing effect in experimental models. We investigated the effect of fresh frozen plasma transfusion on systemic inflammation and endothelial condition.MethodsA prospective predefined substudy of a randomized trial in coagulopathic non-bleeding critically ill patients receiving a prophylactic transfusion of FFP (12 ml/kg) prior to an invasive procedure. Levels of inflammatory cytokines and markers of endothelial condition were measured in paired samples of 33 patients before and after transfusion. The statistical tests used were paired t test or the Wilcoxon signed-rank test.ResultsAt baseline, systemic cytokine levels were mildly elevated in critically ill patients. FFP transfusion resulted in a decrease of levels of TNF-α (from 11.3 to 2.3 pg/ml, P = 0.01). Other cytokines were not affected. FFP also resulted in a decrease in systemic syndecan-1 levels (from 675 to 565 pg/ml, P = 0.01) and a decrease in factor VIII levels (from 246 to 246%, P <0.01), suggestive of an improved endothelial condition. This was associated with an increase in ADAMTS13 levels (from 24 to 32%, P <0.01) and a concomitant decrease in von Willebrand factor (vWF) levels (from 474 to 423%, P <0.01).ConclusionsA fixed dose of FFP transfusion in critically ill patients decreases syndecan-1 and factor VIII levels, suggesting a stabilized endothelial condition, possibly by increasing ADAMTS13, which is capable of cleaving vWF.

Trial registrations

Trialregister.nl NTR2262, registered 26 March 2010 and Clinicaltrials.gov NCT01143909, registered 14 June 2010.  相似文献   
6.
7.
8.

Objectives

The perceived threat of HIV transmission through spitting and biting is evidenced by the increasing use of “spit hoods” by Police Forces in the UK. In addition, a draft parliamentary bill has called for increased penalties for assaults on emergency workers, citing the risk of communicable disease transmission as one justification. We aimed to review literature relating to the risk of HIV transmission through biting or spitting.

Methods

A systematic literature search was conducted using Medline, Embase and Northern Lights databases and conference websites using search terms relating to HIV, AIDS, bite, spit and saliva. Inclusion and exclusion criteria were applied to identified citations. We classified plausibility of HIV transmission as low, medium, high or confirmed based on pre‐specified criteria.

Results

A total of 742 abstracts were reviewed, yielding 32 articles for full‐text review and 13 case reports/series after inclusion and exclusion criteria had been applied. There were no reported cases of HIV transmission related to spitting and nine cases identified following a bite, in which the majority occurred between family (six of nine), in fights involving serious wounds (three of nine), or to untrained first‐aiders placing fingers in the mouth of someone having a seizure (two of nine). Only four cases were classified as highly plausible or confirmed transmission. None related to emergency workers and none were in the UK.

Conclusions

There is no risk of transmitting HIV through spitting, and the risk through biting is negligible. Post‐exposure prophylaxis is not indicated after a bite in all but exceptional circumstances. Policies to protect emergency workers should be developed with this evidence in mind.  相似文献   
9.
目的探讨右美托咪定用于腹腔镜子宫切除术全麻维持的效果。方法选取该院进行腹腔镜子宫切除术患者100例,随机分为两组,研究组气管插管后静脉泵注右美托咪定;对照组不使用右美托咪定。结果研究组的自主呼吸恢复时间、气管导管拔出时间、术后清醒时间优于对照组(P〈0.05)。结论右美托咪定静脉泵注用于全麻维持可缩短患者的全麻复苏时间,效果显著。  相似文献   
10.
目的 观察及探究子宫内膜异位症患者血清及组织OPN、CA125、HMGB1、VEGF及其受体的变化状态.方法 选取2011年7月-2013年12月本院收治的75例子宫内膜异位症患者为观察组,并以同期的75例外伤手术患者为对照组,将两组OPN、CA125、HMGB1、VEGF及其受体的血清水平和组织阳性率进行比较,并比较观察组中不同r-AFS分期和分型者的血清水平及组织阳性率.结果 观察组OPN、CA125、HMGB1、VEGF及其受体的血清水平和组织阳性率均高于对照组,且分期较高及存在深部浸润病灶者的血清水平和组织阳性率高于分期较低及未伴有深部浸润病灶者(P<0.05),差异有统计学意义.结论 子宫内膜异位症患者血清及组织OPN、CA125、HMGB1、VEGF及其受体均呈现较高状态,且分期及是否存在深部浸润病灶对其有较大影响.  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