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   101947篇
  免费   10009篇
  国内免费   203篇
耳鼻咽喉   1287篇
儿科学   3283篇
妇产科学   2477篇
基础医学   14474篇
口腔科学   2312篇
临床医学   12844篇
内科学   17911篇
皮肤病学   1565篇
神经病学   9154篇
特种医学   3036篇
外国民族医学   10篇
外科学   13040篇
综合类   1907篇
一般理论   111篇
预防医学   12074篇
眼科学   2219篇
药学   8105篇
  1篇
中国医学   104篇
肿瘤学   6245篇
  2021年   1403篇
  2020年   1075篇
  2019年   1653篇
  2018年   1951篇
  2017年   1455篇
  2016年   1546篇
  2015年   1744篇
  2014年   2389篇
  2013年   3643篇
  2012年   5011篇
  2011年   5339篇
  2010年   2849篇
  2009年   2733篇
  2008年   4529篇
  2007年   4993篇
  2006年   4853篇
  2005年   4825篇
  2004年   4559篇
  2003年   4211篇
  2002年   4066篇
  2001年   2862篇
  2000年   2924篇
  1999年   2585篇
  1998年   1153篇
  1997年   934篇
  1996年   904篇
  1995年   903篇
  1994年   899篇
  1993年   851篇
  1992年   2165篇
  1991年   2088篇
  1990年   1950篇
  1989年   1913篇
  1988年   1812篇
  1987年   1821篇
  1986年   1715篇
  1985年   1707篇
  1984年   1429篇
  1983年   1311篇
  1982年   903篇
  1981年   771篇
  1980年   694篇
  1979年   1249篇
  1978年   908篇
  1977年   794篇
  1976年   754篇
  1975年   743篇
  1974年   898篇
  1973年   793篇
  1972年   762篇
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
1.
2.
In 2016, an eConsult service was developed within a safety net health system to expand access to hepatitis C (HCV) treatment in the primary care setting. The eConsult system provides individualized treatment recommendations from specially trained primary care pharmacists and primary care physicians to primary care providers with less experience in the rapidly changing treatment of HCV. Since its launch, this service has had a large impact in expanding care to a largely homeless and low-income urban population within our health system. We now aim to evaluate its efficacy in curing HCV. In this retrospective cohort study, we describe rates of sustained virologic response 12 weeks after treatment completion (SVR12) for those who received primary care-based HCV treatment through the eConsult system with those who were treated in primary care independent of an eConsult from 2017 to 2019. We found there was no significant difference in the proportion of patients who achieved SVR12 between the two groups. Overall, >90% of patients who received treatment achieved SVR12. Approximately 40% of patients treated for HCV received an eConsult, suggesting utility of the eConsult in expanding access and coordinating treatment for patients within our network.  相似文献   
3.
4.
5.
Journal of Thrombosis and Thrombolysis - Alteplase treatment can cause a systemic coagulopathy although the incidence and contributory factors are unknown in pulmonary embolism (PE). Fixed-dosing...  相似文献   
6.
7.
Maternal and Child Health Journal - In Virginia, Black women experience higher rates of adverse birth and labor outcomes that may not be explained solely by risky behaviors or social standing....  相似文献   
8.
9.
Detailed contemporary knowledge of the characteristics of the surgical population, national anaesthetic workload, anaesthetic techniques and behaviours are essential to monitor productivity, inform policy and direct research themes. Every 3–4 years, the Royal College of Anaesthetists, as part of its National Audit Projects (NAP), performs a snapshot activity survey in all UK hospitals delivering anaesthesia, collecting patient-level encounter data from all cases under the care of an anaesthetist. During November 2021, as part of NAP7, anaesthetists recorded details of all cases undertaken over 4 days at their site through an online survey capturing anonymous patient characteristics and anaesthetic details. Of 416 hospital sites invited to participate, 352 (85%) completed the activity survey. From these, 24,177 reports were returned, of which 24,172 (99%) were included in the final dataset. The work patterns by day of the week, time of day and surgical specialty were similar to previous NAP activity surveys. However, in non-obstetric patients, between NAP5 (2013) and NAP7 (2021) activity surveys, the estimated median age of patients increased by 2.3 years from median (IQR) of 50.5 (28.4–69.1) to 52.8 (32.1–69.2) years. The median (IQR) BMI increased from 24.9 (21.5–29.5) to 26.7 (22.3–31.7) kg.m–2. The proportion of patients who scored as ASA physical status 1 decreased from 37% in NAP5 to 24% in NAP7. The use of total intravenous anaesthesia increased from 8% of general anaesthesia cases to 26% between NAP5 and NAP7. Some changes may reflect the impact of the COVID-19 pandemic on the anaesthetic population, though patients with confirmed COVID-19 accounted for only 149 (1%) cases. These data show a rising burden of age, obesity and comorbidity in patients requiring anaesthesia care, likely to impact UK peri-operative services significantly.  相似文献   
10.

Background

Patients undergoing cardiac surgery are at significant risk of developing postoperative acute kidney injury (AKI). Neutrophil–lymphocyte ratio (NLR) is a widely available inflammatory biomarker which may be of prognostic value in this setting.

Methods

We conducted a systematic review and meta-analysis of studies reporting associations between perioperative NLR with postoperative AKI. We searched Medline, Embase and the Cochrane Library, without language restriction, from inception to May 2022 for relevant studies. We meta-analysed the reported odds ratios (ORs) with 95% confidence intervals (CIs) for both elevated preoperative and postoperative NLR with risk of postoperative AKI and need for renal replacement therapy (RRT). We conducted a meta-regression to explore inter-study statistical heterogeneity.

Results

Twelve studies involving 10,724 participants undergoing cardiac surgery were included, with eight studies being deemed at high risk of bias using PROBAST modelling. We found statistically significant associations between elevated preoperative NLR and postoperative AKI (OR 1.45, 95% CI 1.18–1.77), as well as postoperative need for RRT (OR 2.37, 95% CI 1.50–3.72). Postoperative NLR measurements were not of prognostic significance.

Conclusions

Elevated preoperative NLR is a reliable inflammatory biomarker for predicting AKI following cardiac surgery.  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