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   27740篇
  免费   1499篇
  国内免费   718篇
耳鼻咽喉   51篇
儿科学   476篇
妇产科学   119篇
基础医学   2844篇
口腔科学   248篇
临床医学   3104篇
内科学   8827篇
皮肤病学   168篇
神经病学   1583篇
特种医学   470篇
外国民族医学   3篇
外科学   1218篇
综合类   4085篇
现状与发展   2篇
预防医学   719篇
眼科学   90篇
药学   4799篇
  8篇
中国医学   652篇
肿瘤学   491篇
  2024年   23篇
  2023年   291篇
  2022年   573篇
  2021年   870篇
  2020年   774篇
  2019年   748篇
  2018年   775篇
  2017年   741篇
  2016年   736篇
  2015年   873篇
  2014年   1869篇
  2013年   1956篇
  2012年   1516篇
  2011年   1697篇
  2010年   1421篇
  2009年   1448篇
  2008年   1438篇
  2007年   1477篇
  2006年   1338篇
  2005年   1176篇
  2004年   922篇
  2003年   821篇
  2002年   673篇
  2001年   648篇
  2000年   534篇
  1999年   458篇
  1998年   371篇
  1997年   404篇
  1996年   335篇
  1995年   315篇
  1994年   304篇
  1993年   289篇
  1992年   291篇
  1991年   239篇
  1990年   239篇
  1989年   213篇
  1988年   195篇
  1987年   158篇
  1986年   148篇
  1985年   142篇
  1984年   94篇
  1983年   90篇
  1982年   83篇
  1981年   73篇
  1980年   56篇
  1979年   52篇
  1978年   26篇
  1977年   13篇
  1976年   8篇
  1974年   8篇
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
1.
2.
3.
4.
5.
目的 探讨健脾消积颗粒治疗脾胃湿热型功能性消化不良的临床疗效及其对脑肠肽的影响。方法 按照随机数字表法将2018年2月-2019年2月我院收治的80例功能性消化不良患儿均分为对照组和观察组,对照组给予多潘立酮片治疗,观察组在对照组基础上加用健脾消积颗粒治疗,比较2组治疗效果。结果 治疗后2组主要临床症状积分均显著下降,观察组下降更为明显。观察组总有效率为95%,显著高于对照组的79.5%。观察组治疗后胃电节律异常例数明显低于对照组,治疗后2组胃动素(MTL)显著上升,神经肽Y(NPY)、神经降压素(NT)显著下降,且观察组和对照组相比,差异有统计学意义。2组治疗期间均未发生不良反应及肝肾功能异常。结论 健脾消积颗粒能够明显改善脾胃湿热型功能性消化不良患儿临床症状,改善胃动力水平,调节脑肠肽分泌水平。  相似文献   
6.
Abstract

Objective

The sex, age, medical history, treatment, tobacco use, race risk (SAMe-TT2R2) Score; the sex, age, medical history, treatment, tobacco use, genotype combination (SAMe-TT2G2) Score; and the so-called modified SAMe-TT2R2 scores have been proposed to predict the anticoagulation quality for patients with non-valvular atrial fibrillation (NVAF). The data from a prospective controlled study is used to validate the SAMe-TT2R2 and SAMe-TT2G2 scores in Chinese NVAF patients treated with warfarin and to evaluate the association of factors with time in therapeutic range (TTR) to predict the quality of oral anticoagulation control.  相似文献   
7.
8.
We report a case of a young male presenting as Restrictive cardiomyopathy, refractory heart failure and syncope due to typical right atrial flutter complicating hypertrophic cardiomyopathy.Successful catheter ablation of the flutter promptly ameliorated the congestive failure with resolution of restrictive physiology.  相似文献   
9.
BackgroundThe relationship of atrial fibrillation (AF) with coronary artery disease (CAD) is well established, yet it is often missed. There is evidence of myocardial ischemia on stress imaging in AF patients in the absence of obstructive CAD. In this prospective cohort, we studied the angiographic profiles of non-valvular AF patients.MethodsThe study was a nonrandomized, prospective, single-center observational study of consecutive patients of persistent non-valvular AF. Patients symptomatic for AF despite optimal medical therapy for 3 months were recruited and all underwent coronary angiograms (CAG). Patients with prior history of CAD were excluded.ResultsA total of 70 patients were followed for a mean duration of 12 ± 1.4 months. The mean age of the study group was 66.07 (±11.49) years. Hypertension was the commonest comorbidity seen in 74% patients. Obstructive CAD was present in 32 (46%) patients, non-obstructive (<50% stenosis) CAD in 17 (24%) patients and normal coronaries in 21 (30%) patients. Overall 49 (70%) patients had evidence of CAD. Amongst patients without obstructive CAD, slow flow was seen in 16 (42%) patients. Lower baseline ejection fraction, lower haemoglobin & albumin levels and higher creatinine levels was associated with increased mortality. In patients without obstructive CAD, hospitalizations for fast ventricular rate were significantly increased in those having slow flow on CAG (p = 0.005).ConclusionsMajority (70%) of our patients had evidence of atherosclerotic CAD on CAG. A large proportion of patients without obstructive CAD had slow flow on CAG.  相似文献   
10.

Objective

To assay peripheral inter-ictal cytokine serum levels and possible relations with non-invasive vagus nerve stimulation (nVNS) responsiveness in migraineurs.

Methods

This double-blinded, sham-controlled study enrolled 48 subjects and measured headache severity, frequency [headache days/month, number of total and mild/moderate/severe classified attacks/month], functional state [sleep, mood, body weight, migraine-associated disability] and serum levels of inflammatory markers [inter-ictal] using enzyme-linked immunoassays at baseline and after 2 months of adjunctive nVNS compared to sham stimulation and suitably matched controls.

Results

No significant differences were observed at baseline and after 2 months for headache severity, total attacks/month, headache days/month and functional outcome [sleep, mood, disability] between verum and sham nVNS. However, the number of severe attacks/month significantly decreased in the verum nVNS group and circulating pro-inflammatory IL-1β was elevated significantly in the sham group compared to nVNS. Levels of anti-inflammatory IL-10 were significantly higher at baseline in both groups compared to healthy controls, but not at 2 months follow-up [p?<?0.05]. Concentrations of high-mobility group box-1 (HMGB-1), IL-6, tumor-necrosis factor-α (TNF-α), leptin, adiponectin, ghrelin remained unchanged [p?>?0.05]. No severe device-/stimulation-related adverse events occurred.

Conclusion

2 months of adjunctive cervical nVNS significantly declined the number of severe attacks/month. Pro-inflammatory IL-1β plasma levels [inter-ictal] were higher in sham-treated migraine patients compared to verum nVNS. However, pro- [IL-6, HMGB-1, TNF-α, leptin] and anti-inflammatory [IL-10, adiponectin, ghrelin] mediators did not differ statistically. Profiling of neuroinflammatory circuits in migraine to predict nVNS responsiveness remains an experimental approach, which may be biased by pre-analytic variables warranting large-scale biobank-based systematic investigations [omics].  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