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   33524篇
  免费   2253篇
  国内免费   98篇
耳鼻咽喉   490篇
儿科学   828篇
妇产科学   475篇
基础医学   4039篇
口腔科学   452篇
临床医学   3651篇
内科学   6812篇
皮肤病学   424篇
神经病学   2937篇
特种医学   1355篇
外科学   5669篇
综合类   383篇
一般理论   40篇
预防医学   2970篇
眼科学   517篇
药学   2540篇
中国医学   30篇
肿瘤学   2263篇
  2023年   223篇
  2022年   182篇
  2021年   990篇
  2020年   636篇
  2019年   976篇
  2018年   1170篇
  2017年   812篇
  2016年   824篇
  2015年   984篇
  2014年   1478篇
  2013年   1944篇
  2012年   2798篇
  2011年   2867篇
  2010年   1503篇
  2009年   1392篇
  2008年   2396篇
  2007年   2337篇
  2006年   2149篇
  2005年   2175篇
  2004年   2045篇
  2003年   1829篇
  2002年   1679篇
  2001年   182篇
  2000年   163篇
  1999年   197篇
  1998年   264篇
  1997年   190篇
  1996年   188篇
  1995年   156篇
  1994年   161篇
  1993年   135篇
  1992年   79篇
  1991年   76篇
  1990年   66篇
  1989年   63篇
  1988年   50篇
  1987年   41篇
  1986年   30篇
  1985年   37篇
  1984年   50篇
  1983年   55篇
  1982年   68篇
  1981年   44篇
  1980年   31篇
  1979年   21篇
  1978年   20篇
  1977年   17篇
  1976年   12篇
  1975年   13篇
  1974年   8篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
After severe neurocognitive decline developed in an otherwise healthy 63-year-old man, brain magnetic resonance imaging showed eosinophilic meningoencephalitis and enhancing lesions. The patient tested positive for antibodies to Baylisascaris spp. roundworms, was treated with albendazole and dexamethasone, and showed improvement after 3 months. Baylisascariasis should be considered for all patients with eosinophilic meningitis.  相似文献   
93.
94.
95.
96.
BackgroundTwin anemia-polycythemia sequence (TAPS) is a complication of monochorionic, multiple gestation pregnancies in which blood shunting through placental anastomoses results in chronic anemia in one fetus and chronic polycythemia in another. The outcomes of different treatment modalities for TAPS are not well known.ObjectiveTo determine the outcomes of the intrauterine interventions used to treat TAPS.Study DesignA systematic literature search of MEDLINE, EMBASE, and CENTRAL was performed in June 2016. Primary outcomes were mortality, morbidity, and adverse perinatal outcomes. Data were summarized in the form of weighted means, and statistical difference was determined.ResultsTwenty-one articles were identified for inclusion in this review and were composed of 105 cases of TAPS. In the cases presented in the literature, there was no statistically significant difference in mortality, morbidity, or emergent Caesarean section rates between expectant management, intrauterine transfusion (IUT), and laser ablation therapy. Laser ablation therapy and IUT were found to have a significantly lower rate of adverse perinatal outcomes when compared to expectantly managed cases.ConclusionsThe literature looking into the treatment of TAPS is very limited, with no randomized controlled trials and only one includable comparative study. Based on the data in the case report and case study literature, there is no mortality difference between any of the treatment modalities. Expectant management may be associated with an increase in adverse perinatal outcomes when compared to laser therapy and IUT. More comparative studies are needed to assist clinicians in adopting an evidence-based approach to the treatment of TAPS.  相似文献   
97.
98.

Background

There are conflicting data regarding the relative effectiveness of renal sympathetic denervation (RSD) in patients with hypertension.

Objectives

The purpose of this study was to evaluate the blood pressure (BP) response after RSD in sham-controlled randomized trials.

Methods

Databases were searched through June 30, 2018. Randomized trials (RCTs) with ≥50 patients comparing catheter-based RSD with a sham control were included. The authors calculated summary treatment estimates as weighted mean differences (WMD) with 95% confidence intervals (CIs) using random-effects meta-analysis.

Results

The analysis included 977 patients from 6 trials. The reduction in 24-h ambulatory systolic blood pressure (ASBP) was significantly greater for patients treated with RSD than sham procedure (WMD ?3.65 mm Hg, 95% CI: ?5.33 to ?1.98; p < 0.001). Compared with sham, RSD was also associated with a significant decrease in daytime ASBP (WMD ?4.07 mm Hg, 95% CI: ?6.46 to ?1.68; p < 0.001), office systolic BP (WMD ?5.53 mm Hg, 95% CI: ?8.18 to ?2.87; p < 0.001), 24-h ambulatory diastolic BP (WMD ?1.71 mm Hg, 95% CI: ?3.06 to ?0.35; p = 0.01), daytime ambulatory diastolic BP (WMD ?1.57 mm Hg, 95% CI: ?2.73 to ?0.42; p = 0.008), and office diastolic BP (WMD ?3.37 mm Hg, 95% CI: ?4.86 to ?1.88; p < 0.001). Compared with first-generation trials, a significantly greater reduction in daytime ASBP was observed with RSD in second-generation trials (6.12 mm Hg vs. 2.14 mm Hg; p interaction = 0.04); however, this interaction was not significant for 24-h ASBP (4.85 mm Hg vs. 2.23 mm Hg; p interaction = 0.13).

Conclusions

RSD significantly reduced blood pressure compared with sham control. Results of this meta-analysis should inform the design of larger, pivotal trials to evaluate the long-term efficacy and safety of RSD in patients with hypertension.  相似文献   
99.
100.
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