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   41100篇
  免费   4340篇
  国内免费   1120篇
耳鼻咽喉   195篇
儿科学   1667篇
妇产科学   339篇
基础医学   5200篇
口腔科学   618篇
临床医学   4500篇
内科学   9559篇
皮肤病学   934篇
神经病学   2283篇
特种医学   661篇
外国民族医学   4篇
外科学   2749篇
综合类   6526篇
现状与发展   4篇
一般理论   1篇
预防医学   2852篇
眼科学   509篇
药学   3877篇
  27篇
中国医学   2901篇
肿瘤学   1154篇
  2024年   169篇
  2023年   941篇
  2022年   1071篇
  2021年   2151篇
  2020年   2003篇
  2019年   1744篇
  2018年   1665篇
  2017年   1774篇
  2016年   1874篇
  2015年   1682篇
  2014年   3065篇
  2013年   3222篇
  2012年   2906篇
  2011年   3033篇
  2010年   2256篇
  2009年   2172篇
  2008年   2079篇
  2007年   1888篇
  2006年   1630篇
  2005年   1440篇
  2004年   1118篇
  2003年   895篇
  2002年   770篇
  2001年   686篇
  2000年   540篇
  1999年   464篇
  1998年   425篇
  1997年   347篇
  1996年   335篇
  1995年   255篇
  1994年   235篇
  1993年   217篇
  1992年   216篇
  1991年   164篇
  1990年   144篇
  1989年   125篇
  1988年   108篇
  1987年   109篇
  1986年   94篇
  1985年   110篇
  1984年   80篇
  1983年   56篇
  1982年   62篇
  1981年   50篇
  1980年   41篇
  1979年   32篇
  1978年   27篇
  1977年   25篇
  1976年   24篇
  1974年   12篇
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
991.
刘强  邓华聪  李永玲  何辉  代薇  林小琴 《重庆医学》2015,(14):1888-1890
目的:研究银丹心脑通软胶囊对2型糖尿病氧化应激及血管内皮功能的影响。方法86例2型糖尿病患者按照随机数字表法分成常规降糖治疗组(常规组,n=40)和银丹心脑通软胶囊治疗组(银丹心脑通组,n=46)。常规组患者在控制饮食、运动等基础上给予降糖治疗使血糖连续达标12周,银丹心脑通组在常规治疗血糖达标基础上加用银丹心脑通软胶囊(每次1.2 g ,每日3次)连续治疗12周。检测两组患者治疗前后血脂、丙二醛(MDA)、超氧化物歧化酶(SOD)、一氧化氮(NO)、内皮素(ET)等相关因素变化,应用超声检测肱动脉血流介导的内皮依赖性舒张功能(FMD)和非内皮依赖性血管舒张功能(NMD)。结果治疗12周后两组患者血浆总胆固醇(TC)、三酰甘油(TG)、低密度脂蛋白胆固醇(LDL‐C)、MDA、ET 较治疗前均有明显下降,高密度脂蛋白胆固醇(HDL‐C)、SOD、NO、FMD则较治疗前升高(P<0.05);而且银丹心脑通组治疗后上述各项指标与常规组治疗后比较也有显著变化(P<0.05)。结论银丹心脑通软胶囊可下调2型糖尿病氧化应激,调节糖尿病脂代谢异常,明显改善损伤的血管内皮功能。  相似文献   
992.
目的:研究老年2型糖尿病患者体质量指数(BMI)和腰臀比(WHR)与血小板参数的相关性。方法选取2012年10月到2014年2月该院收治的82例2型糖尿病患者作为研究对象,选取同期进行健康体检的80例健康老年人作为对照组。将患者按照BM I分为3组,Ⅰ组(正常组)23例,Ⅱ组(超质量组)38例,Ⅲ组(肥胖组)21例。比较各组患者和对照组的血糖、糖化血红蛋白(HbA1c)水平、血脂异常和腹型肥胖的发生率;比较不同BMI和WHR的老年人血脂水平和血小板参数,比较不同血脂水平老年人的血小板参数。结果3组患者的血糖、HbA1c水平、BMI、WHR、血脂异常和腹型肥胖的发生率高于对照组,差异有统计学意义(P<0.05)。不同BMI和WHR老年人的血脂水平和血小板参数差异有统计学意义(P<0.05)。不同血脂水平老年人的血小板参数差异有统计学意义(P<0.05)。结论老年2型糖尿病患者BMI和WHR与血小板参数具有一定的相关性,可能与肥胖和血脂代谢紊乱对血管内皮的损伤有关。  相似文献   
993.

Objective

To compare the efficacy of intra-articular (IA) steroid injection and distension in patients with frozen shoulder.

Data Sources

Databases, including MEDLINE (via PubMed), Embase, Scopus, and Cochrane Library, were searched for studies published up to November 2016.

Study Selection

We included all published randomized controlled trials (RCTs), quasi-experimental studies, and observational studies investigating the effectiveness of IA steroid injection, distension, and physiotherapy in patients with frozen shoulder. Sixteen RCTs and 1 observational study were enrolled in meta-analysis.

Data Extraction

Full texts were independently reviewed, and quality of RCTs was assessed with The Cochrane Collaboration's tool. The primary outcome was functional improvement; the secondary outcomes included pain reduction and external rotation (ER) improvement.

Data Synthesis

In pairwise meta-analysis, pooled standardized mean difference (SMD) of functional improvement and pain reduction revealed equal efficacy at 3 follow-up time points. With respect to ER improvement, distension has a superior effect compared with IA steroid injection in the short term [(2–4wk; SMD, ?.36; 95% confidence interval [CI], ?.68 to ?.04) and medium term (6–16wk; SMD, ?0.80; 95% CI, ?1.32 to ?0.29). The network meta-analysis indicated a better efficacy for distension than for IA steroid injection in ER improvement only in the medium term (6–16wk; SMD, ?0.70; 95% CI, ?1.19 to ?0.21).

Conclusions

IA steroid injection was as effective as distension in shoulder function improvement, pain reduction, and increasing ER of the shoulder. Distension yielded better ER improvement in the medium term but to a minor extent in the long term. For patients with predominant ER limitation, early distension could be considered the primary choice of treatment.  相似文献   
994.

Objective

To review the literature and assess the comparative effectiveness of ultrasound-guided versus landmark-guided local corticosteroid injections in patients with carpal tunnel syndrome (CTS).

Data Sources

Cochrane Central Register of Controlled Trials, MEDLINE (PubMed), Embase (Ovid), and Web of Science (from inception to February 1, 2017).

Study Selection

Randomized controlled trials (RCTs) comparing ultrasound-guided injection with landmark-guided injection in patients with CTS were included.

Data Extraction

Two authors independently screened abstracts and full texts. The outcomes of interest were Symptom Severity Scale (SSS) and Functional Status Scale (FSS) scores of the Boston Carpal Tunnel Questionnaire and 4 electrodiagnostic parameters, including compound muscle action potential (CMAP), sensory nerve action potential (SNAP), distal motor latency (DML), and distal sensory latency (DSL).

Data Synthesis

Overall, 569 abstracts were retrieved and checked for eligibility; finally, 3 RCTs were included (181 injected hands). Pooled analysis showed that ultrasound-guided injection was more effective in SSS improvement (mean difference [MD], ?.46; 95% confidence interval [CI], ?.59 to ?.32; P<.00001), whereas no significant difference was observed between the 2 methods in terms of the FSS (MD, ?.25; 95% CI, ?.56 to .05; P=.10). There were also no statistically significant differences in improvements of CMAP (MD, 1.54; 95% CI, 0.01 to 3.07; P=.05), SNAP (MD, ?0.02; 95% CI, ?6.27 to 6.23; P>.99), DML (MD, .05; 95% CI, ?.30 to .39; P=.80), or DSL (MD, .00; 95% CI, ?.65 to .65; P>.99).

Conclusions

This review suggested that ultrasound-guided injection was more effective than landmark-guided injection in symptom severity improvement in patients with CTS; however, no significant differences were observed in functional status or electrodiagnostic improvements between the 2 methods.  相似文献   
995.

Objective

To examine whether a Rasch analysis is sufficient to establish the construct validity of the Motor Function Measure (MFM) and discuss whether weighting the MFM item scores would improve the MFM construct validity.

Design

Observational cross-sectional multicenter study.

Setting

Twenty-three physical medicine departments, neurology departments, or reference centers for neuromuscular diseases.

Participants

Patients (N=911) aged 6 to 60 years with Charcot-Marie-Tooth disease (CMT), facioscapulohumeral dystrophy (FSHD), or myotonic dystrophy type 1 (DM1).

Interventions

None.

Main Outcome Measure(s)

Comparison of the goodness-of-fit of the confirmatory factor analysis (CFA) model vs that of a modified multidimensional Rasch model on MFM item scores in each considered disease.

Results

The CFA model showed good fit to the data and significantly better goodness of fit than the modified multidimensional Rasch model regardless of the disease (P<.001). Statistically significant differences in item standardized factor loadings were found between DM1, CMT, and FSHD in only 6 of 32 items (items 6, 27, 2, 7, 9 and 17).

Conclusions

For multidimensional scales designed to measure patient abilities in various diseases, a Rasch analysis might not be the most convenient, whereas a CFA is able to establish the scale construct validity and provide weights to adapt the item scores to a specific disease.  相似文献   
996.

Objective

To update the clinical recommendations for cognitive rehabilitation of people with multiple sclerosis (MS), based on a systematic review of the literature from 2007 through 2016.

Data Sources

Searches of MEDLINE, PsycINFO, and CINAHL were conducted with a combination of the following terms: attention, awareness, cognition, cognitive, communication, executive, executive function, language, learning, memory, perception, problem solving, reasoning, rehabilitation, remediation, training, processing speed, and working memory. One hundred twenty-nine articles were identified and underwent initial screening.

Study Selection

Fifty-nine articles were selected for inclusion after initial screening. Nineteen studies were excluded after further detailed review. Forty studies were fully reviewed and evaluated.

Data Extraction

Articles were assigned to 1 of 6 categories: attention, learning and memory, processing speed and working memory, executive functioning, metacognition, or nonspecified/combined cognitive domains. Articles were abstracted and levels of evidence were decided using specific criteria.

Data Synthesis

The current review yielded 6 class I studies, 10 class II studies, and 24 class III studies. One intervention in the area of verbal learning and memory received support for a practice standard, 2 computer programs received support as practice guidelines (in the area of attention and multicognitive domains), and several studies provided support for 5 practice options in the domains of attention and learning and memory.

Conclusions

Substantial progress has been made since our previous review regarding the identification of effective treatments for cognitive impairments in persons with MS. However, much work remains to be done to optimize rehabilitation potential by applying the most methodologically rigorous research designs to provide class I evidence in support of a given treatment strategy.  相似文献   
997.

Objective

To evaluate the current evidence of the effectiveness of dry needling of myofascial trigger points (MTrPs) associated with low back pain (LBP).

Data Sources

PubMed, Ovid, EBSCO, ScienceDirect, Web of Science, Cochrane Library, CINAHL, and China National Knowledge Infrastructure databases were searched until January 2017.

Study Selection

Randomized controlled trials (RCTs) that used dry needling as the main treatment and included participants diagnosed with LBP with the presence of MTrPs were included.

Data Extraction

Two reviewers independently screened articles, scored methodologic quality, and extracted data. The primary outcomes were pain intensity and functional disability at postintervention and follow-up.

Data Synthesis

A total of 11 RCTs involving 802 patients were included in the meta-analysis. Results suggested that compared with other treatments, dry needling of MTrPs was more effective in alleviating the intensity of LBP (standardized mean difference [SMD], ?1.06; 95% confidence interval [CI], ?1.77 to ?0.36; P=.003) and functional disability (SMD, ?0.76; 95% CI, ?1.46 to ?0.06; P=.03); however, the significant effects of dry needling plus other treatments on pain intensity could be superior to dry needling alone for LBP at postintervention (SMD, 0.83; 95% CI, 0.55–1.11; P<.00001).

Conclusions

Moderate evidence showed that dry needling of MTrPs, especially if associated with other therapies, could be recommended to relieve the intensity of LBP at postintervention; however, the clinical superiority of dry needling in improving functional disability and its follow-up effects still remains unclear.  相似文献   
998.

Objective

To assess the effectiveness of exercise programs on disease activity and function in ankylosing spondylitis (AS) by a systematic review and meta-analysis of randomized controlled trials (RCTs).

Data Sources

Medline via PubMed and Cochrane Library.

Study Selection

Reports of RCTs examining the effectiveness of exercise programs for AS published up to May 2017.

Data Extraction

Outcomes were evolution of the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) and Bath Ankylosing Spondylitis Functional Index (BASFI) after the completion of exercise programs. Modalities of exercise were compared and the use of biologic therapy was reported.

Data Synthesis

After screening 190 abstracts, we selected 26 reports for detailed evaluation and finally investigated 8 trials that assessed a home-based exercise program (2/8), swimming (1/8), Pilates training (1/8), or supervised exercises (4/8), for a total of 331 patients with AS. Four trials included patients receiving antitumor necrosis factor therapy. All trials except one showed a decrease in BASDAI and BASFI with exercise. The weighted mean difference was ?0.90 (95% confidence interval, ?1.52 to ?0.27; I2=69%; P=.005) for the BASDAI and ?0.72 (95% confidence interval, ?1.03 to ?0.40; I2=0%; P<.00001) for the BASFI in favor of exercise programs.

Conclusions

Despite the small number of patients and the heterogeneity of exercise programs in the RCTs included in this meta-analysis, its results support the potential of exercise programs to improve disease activity and body function in AS.  相似文献   
999.

Objectives

To provide an evidence-based overview of the effectiveness of conservative and (post)surgical interventions for trigger finger, Dupuytren disease, and De Quervain disease.

Data Sources

Cochrane Library, Physiotherapy Evidence Database, PubMed, Embase, and CINAHL were searched to identify relevant systematic reviews and randomized controlled trials (RCTs).

Data Selection

Two reviewers independently applied the inclusion criteria to select potential studies.

Data Extraction

Two reviewers independently extracted the data and assessed the methodologic quality.

Data Synthesis

A best-evidence synthesis was performed to summarize the results. Two reviews (trigger finger and De Quervain disease) and 37 randomized controlled trials (RCTs) (trigger finger: n=8; Dupuytren disease: n=14, and De Quervain disease: n=15) were included. The trials reported on oral medication (Dupuytren disease), physiotherapy (De Quervain disease), injections and surgical treatment (trigger finger, Dupuytren disease, and De Quervain disease), and other conservative (De Qervain disease) and postsurgical treatment (Dupuytren disease). Moderate evidence was found for the effect of corticosteroid injection on the very short term for trigger finger, De Quervain disease, and for injections with collagenase (30d) when looking at all joints, and no evidence was found when looking at the PIP joint for Dupuytren disease. A thumb splint as additive to a corticosteroid injection seems to be effective (moderate evidence) for De Quervain disease (short term and midterm). For Dupuytren disease, use of a corticosteroid injection within a percutaneous needle aponeurotomy in the midterm and tamoxifen versus a placebo before or after a fasciectomy seems to promising (moderate evidence). We also found moderate evidence for splinting after Dupuytren surgery in the short term.

Conclusions

In recent years, more and more RCTs have been conducted to study treatment of the aforementioned hand disorders. However, more high-quality RCTs are still needed to further stimulate evidence-based practice for patients with trigger finger, Dupuytren disease, and De Quervain disease.  相似文献   
1000.

Objective

To document in adults affected by autosomal recessive spastic ataxia of Charlevoix-Saguenay (ARSACS) the intra- and interrater reliability, standard error of measurement, agreement, minimal detectable change, and construct validity of the 9-Hole Peg Test (NHPT), the Standardized Finger-to-Nose Test (SFNT), and grip strength.

Design

Metrologic study.

Setting

Neuromuscular rehabilitation clinic.

Participants

Genetically confirmed adult patients with ARSACS (N=42; 21 women; mean age, 38.6y).

Interventions

Not applicable.

Main Outcome Measures

Intra- and interrater reliability was determined using the intraclass correlation coefficient (ICC). Construct validity was determined by assessing the capacity of the NHPT, the SFNT, and grip strength to distinguish between participants based on sex, mobility stages, and age groups, and on performance on the Archimedes spiral and fast alternating hand movements tests.

Results

All 3 tests have shown excellent reliability (ICC=.90–.98). However, the limit of agreement was influenced by the participant’s performance on the NHPT, and the minimal detectable change was very different for both hands (right=9.7 vs left=28.0). Construct validity was confirmed for the SFNT and NHPT, but it was not demonstrated for grip strength.

Conclusions

Given the metrologic properties assessed in this study, the SFNT is an excellent measure to assess upper limb coordination, whereas the NHPT must be used with caution. The grip strength is reliable but does not seem to reflect disease severity.  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