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   21080篇
  免费   2149篇
  国内免费   39篇
耳鼻咽喉   133篇
儿科学   729篇
妇产科学   841篇
基础医学   3031篇
口腔科学   566篇
临床医学   2499篇
内科学   4172篇
皮肤病学   337篇
神经病学   1821篇
特种医学   672篇
外科学   2588篇
综合类   622篇
一般理论   17篇
预防医学   2107篇
眼科学   227篇
药学   1776篇
  1篇
中国医学   105篇
肿瘤学   1024篇
  2021年   221篇
  2020年   167篇
  2019年   258篇
  2018年   313篇
  2017年   222篇
  2016年   263篇
  2015年   335篇
  2014年   445篇
  2013年   659篇
  2012年   947篇
  2011年   979篇
  2010年   578篇
  2009年   546篇
  2008年   843篇
  2007年   997篇
  2006年   919篇
  2005年   787篇
  2004年   863篇
  2003年   792篇
  2002年   755篇
  2001年   715篇
  2000年   690篇
  1999年   634篇
  1998年   252篇
  1997年   259篇
  1996年   223篇
  1995年   243篇
  1994年   214篇
  1993年   200篇
  1992年   521篇
  1991年   505篇
  1990年   447篇
  1989年   554篇
  1988年   451篇
  1987年   419篇
  1986年   461篇
  1985年   366篇
  1984年   313篇
  1983年   329篇
  1982年   183篇
  1981年   183篇
  1980年   141篇
  1979年   246篇
  1978年   187篇
  1977年   166篇
  1976年   161篇
  1974年   156篇
  1973年   179篇
  1972年   152篇
  1971年   162篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Robinson  Sandra M.  Scott  Jason  Ryan  Sarah  Adams  Nicola  Hassell  Andrew  Walker  David 《Clinical rheumatology》2022,41(12):3869-3877
Clinical Rheumatology - Educating patients about methotrexate is a core role of rheumatology nurses. We have previously reported the scoring of videoed interviews of rheumatology nurses educating...  相似文献   
3.
4.
5.
6.
7.

Background

Bone mineral density (BMD) has been found to improve after parathyroidectomy (PTX) in patients with primary hyperparathyroidism. There are few data on the effect of PTX on BMD in normocalcemic and normohormonal primary hyperparathyroidism.

Methods

A retrospective analysis of 92 primary hyperparathyroidism patients who underwent PTX between 2004 and 2012 with pre- and post-PTX dual-energy x-ray absorptiometry was performed. Within-person changes in BMD pre- and post-PTX were analyzed using log linear mixed models, stratified by biochemical status.

Results

Bone mineral density increased post-PTX in the whole cohort at the lumbar spine (+2.5%), femoral neck (+2.1%), and total hip (+1.9%) and decreased at the one-third radius (–0.9%). On comparison of BMD changes by profile, BMD increased in those with the typical profile at the lumbar spine (3.2%), femoral neck (2.9%), and total hip (2.9%) but declined at the one-third radius (–1.5%). In contrast, BMD improved only at the femoral neck (4.3%) in the normohormonal group and did not change at any site in the normocalcemic group. The typical group had a greater increase in BMD over time at the femoral neck and total hip compared with normocalcemic patients.

Conclusion

Our results indicate that the skeletal benefit of PTX was attenuated in normocalcemic and normohormonal patients, suggesting that skeletal changes after PTX may depend on biochemical profile.  相似文献   
8.
Methadone has several unique characteristics that make it an attractive option for pain relief in serious illness, but the safety of methadone has been called into question after reports of a disproportionate increase in opioid-induced deaths in recent years. The American Pain Society, College on Problems of Drug Dependence, and the Heart Rhythm Society collaborated to issue guidelines on best practices to maximize methadone safety and efficacy, but guidelines for the end-of-life scenario have not yet been developed. A panel of 15 interprofessional hospice and palliative care experts from the U.S. and Canada convened in February 2015 to evaluate the American Pain Society methadone recommendations for applicability in the hospice and palliative care setting. The goal was to develop guidelines for safe and effective management of methadone therapy in hospice and palliative care. This article represents the consensus opinion of the hospice and palliative care experts for methadone use at end of life, including guidance on appropriate candidates for methadone, detail in dosing, titration, and monitoring of patients' response to methadone therapy.  相似文献   
9.
Goals‐of‐care discussions at end‐of‐life are associated with increased patient satisfaction and reduced treatment burdens, reduced family and healthcare worker distress and healthcare costs, while achieving equal life‐expectancy. It is unclear how goals‐of‐care discussions should occur. The objective of the study was to determine which patients could benefit, requirements, content, documentation, and harms and benefits of emergency medicine goals‐of‐care discussions. We sought primary evidence on goals‐of‐care discussions in EDs with adult patients nearing end‐of‐life, published in English after 1989. Data sources included Medline, Embase, PsycINFO, CINAHL, Web of Science and reference lists of included articles. One thousand nine hundred and twenty abstracts were screened, five articles selected. There was no consensus on the meaning of goals‐of‐care, which is often confused with advanced care planning and treatment limitation. Emergency clinicians can identify most patients needing discussions following training. There was no evidence for how to involve stakeholders, nor how to adapt conversations to meet cultural and linguistically diverse needs. Expert panels have suggested requirements and content for conversations with little supporting evidence. There was no evidence for how emergency conversations differ to those in other settings, nor for harms or benefits for holding goals‐of‐care conversations in EDs. Increased ED goals‐of‐care conversations increased hospice referral and reduced in‐patient admissions. Most studies were of moderate quality only, outcomes were not standardised and sample sizes were small. ‘Goals‐of‐care’ is used inconsistently across the literature. This is the first systematic review regarding goals‐of‐care discussions in EDs. Further research is needed on all aspects of these conversations.  相似文献   
10.

Background

Metastases to the brain occur in 10%-16% of patients with breast cancer, with incidence reportedly increasing. Historically, brain metastases (BM) have been treated with whole-brain radiation therapy (WBRT), but stereotactic radiosurgery (SRS) is an increasingly favored treatment option. In this study we used a population-level database to compare patterns of care and survival between WBRT and SRS for BM from breast cancer.

Materials and Methods

The National Cancer Database was used to select patients treated with radiation for BM from primary breast cancer. Groups were classified on the basis of the modality of radiation delivered to the brain and compared across several demographic factors. A Kaplan–Meier survival curve and Cox multivariate analysis were used to compare overall survival. A matched analysis using propensity scores was used to further reduce confounders and compare survival.

Results

The treatment groups were significantly different across several socioeconomic variables including income, insurance status, and treatment setting. The percentage of patients who received SRS increased dramatically in the second half of the analyzed time period (P < .001). Unadjusted median survival was significantly longer for patients who received SRS versus those who received WBRT (P < .001). This finding persisted after propensity score-matching.

Conclusion

Receipt of SRS was associated with different socioeconomic variables and longer overall survival compared with WBRT, highlighting the need for less toxic treatment for patients who are now living longer. The results revealed important socioeconomic differences between patients selected for SRS versus WBRT and emphasizes disparities in access to modern radiation techniques across the United States.  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