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   11641篇
  免费   969篇
  国内免费   176篇
耳鼻咽喉   85篇
儿科学   348篇
妇产科学   169篇
基础医学   941篇
口腔科学   259篇
临床医学   1745篇
内科学   2242篇
皮肤病学   271篇
神经病学   837篇
特种医学   446篇
外科学   2428篇
综合类   32篇
预防医学   1529篇
眼科学   470篇
药学   414篇
中国医学   4篇
肿瘤学   566篇
  2023年   122篇
  2022年   71篇
  2021年   164篇
  2020年   144篇
  2019年   103篇
  2018年   213篇
  2017年   255篇
  2016年   287篇
  2015年   260篇
  2014年   367篇
  2013年   492篇
  2012年   431篇
  2011年   468篇
  2010年   431篇
  2009年   569篇
  2008年   437篇
  2007年   403篇
  2006年   387篇
  2005年   351篇
  2004年   324篇
  2003年   325篇
  2002年   264篇
  2001年   209篇
  2000年   197篇
  1999年   229篇
  1998年   233篇
  1997年   262篇
  1996年   407篇
  1995年   476篇
  1994年   409篇
  1993年   298篇
  1992年   330篇
  1991年   325篇
  1990年   195篇
  1989年   185篇
  1988年   149篇
  1987年   142篇
  1986年   160篇
  1985年   128篇
  1984年   123篇
  1983年   106篇
  1982年   87篇
  1981年   86篇
  1980年   104篇
  1979年   69篇
  1978年   86篇
  1977年   68篇
  1976年   59篇
  1975年   70篇
  1973年   56篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
BACKGROUND: Abnormalities in calcium and vitamin D metabolism have been reported after bariatric surgery. The purpose of this study was to evaluate vitamin D nutritional status among morbidly obese patients before gastric bypass surgery. METHODS: We prospectively studied 279 morbidly obese patients seeking gastric bypass surgery for vitamin D nutritional status as assessed by serum 25-hydroxyvitamin D level. In addition, serum samples were analyzed for calcium, alkaline phosphatase (AP), intact parathyroid hormone (PTH), and 1,25-dihydroxyvitamin D. RESULTS: Mean patient age was 43 +/- 9 years; 87% of the study patients were women, and 72% were white. Serum calcium and AP levels were normal in 88% and 89% of the patients, respectively. Vitamin D depletion, defined as serum 25-hydroxyvitamin D level 相似文献   
4.
5.
6.
7.
Trauma und Berufskrankheit - Zusammenfassung Der Processus coronoideus ist der wichtigste knöcherne Stabilisator des Ellbogengelenks, der vordere Anteil des Lig. collaterale ulnae, welcher am...  相似文献   
8.
9.
10.
Background contextLumbar zygapophyseal joint (Z-joint) synovial cysts can cause low back pain (LBP), spinal stenosis, and lower extremity radiculopathy. In the literature, there are several minimally invasive techniques described with mixed results. Typical recommended treatment is surgical resection of the cyst. Currently, there is little information available concerning the efficacy and outcome with treatment of Z-joint synovial cyst by percutaneous, fluoroscopic, contrast-enhanced distention, and rupture.PurposeTo evaluate the therapeutic value and safety of Z-joint cyst rupture in symptomatic patients.Study design/settingRetrospective cohort study in an academic outpatient physiatric spine practice.Patient sampleThirty-two patients with moderate-to-severe LBP and leg pain (18 women and 14 men with an age range of 46–86 y; mean age, 66 y) with an average preprocedure symptom duration of 5 months. The patient's clinical symptoms correlated with magnetic resonance imaging studies documenting the presence of a synovial cyst at the corresponding level and side of symptoms. Patients had at least 6 months follow-up (range, 6–24).Outcome measuresNumerical Pain Rating Scale, Roland-Morris Disability Questionnaire, North American Spine Society four-point patient satisfaction survey, recurrence of synovial cyst requiring repeat rupture, and need for surgical intervention.MethodsPatients with symptomatic lumbar Z-joint synovial cyst were identified and their charts were reviewed. Patients included in the study either had symptomatic lumbar LBP or LBP with associated lower extremity radiculopathy. All patients in the study had magnetic resonance imaging's documenting Z-joint synovial cyst that corresponded with the patients' clinical symptoms. All patients received fluoroscopically guided, contrast-enhanced, percutaneous facet cyst distention and rupture followed by an intra-articular facet joint injection of 1 cc kenalog and 1 cc of 1% lidocaine. Seventeen of the patients also received a transforaminal epidural steroid injection just before facet cyst rupture. Telephone follow-up was conducted on all patients.ResultsExcellent long-term (average follow-up 1 y; range, 6–24 mo) pain relief was achieved in 23 (72%) of 32 patients undergoing facet cyst rupture. Twelve patients (37.5%) had synovial cyst recurrence and 11 chose to undergo repeat rupture, which resulted in 5 patients (45%) obtaining complete relief of symptoms and 6 patients (55%) requiring surgical intervention for cyst removal. Fisher exact test demonstrated that all patients who did not have a cyst recurrence were a success and obtained complete relief of symptoms (p<.0002). Patients who underwent a repeat rupture had a 50% chance of a successful outcome. There was no statistical significance between a successful outcome and level of facet cyst rupture, the presence of spondylolisthesis, sex, age, or having a transforaminal epidural steroid injection at the time of the procedure. Wilcoxon signed-rank test demonstrated that the difference in Numerical Pain Rating Scale and Roland-Morris Disability Questionnaire scores before and after the procedure was statistically significant (p<.0001). No complications were reported.ConclusionsFluoroscopic percutaneous Z-joint cyst rupture appears to be a safe and effective minimally invasive treatment option. This procedure should be considered before surgical intervention.  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