全文获取类型
收费全文 | 27835篇 |
免费 | 1379篇 |
国内免费 | 257篇 |
专业分类
耳鼻咽喉 | 129篇 |
儿科学 | 2521篇 |
妇产科学 | 529篇 |
基础医学 | 1488篇 |
口腔科学 | 113篇 |
临床医学 | 8814篇 |
内科学 | 4328篇 |
皮肤病学 | 180篇 |
神经病学 | 1191篇 |
特种医学 | 337篇 |
外科学 | 5202篇 |
综合类 | 1706篇 |
一般理论 | 1篇 |
预防医学 | 1294篇 |
眼科学 | 65篇 |
药学 | 1044篇 |
16篇 | |
中国医学 | 88篇 |
肿瘤学 | 425篇 |
出版年
2024年 | 10篇 |
2023年 | 1158篇 |
2022年 | 1368篇 |
2021年 | 1615篇 |
2020年 | 1895篇 |
2019年 | 929篇 |
2018年 | 1019篇 |
2017年 | 982篇 |
2016年 | 1115篇 |
2015年 | 1093篇 |
2014年 | 2131篇 |
2013年 | 1599篇 |
2012年 | 1491篇 |
2011年 | 1410篇 |
2010年 | 1273篇 |
2009年 | 1154篇 |
2008年 | 988篇 |
2007年 | 1023篇 |
2006年 | 937篇 |
2005年 | 828篇 |
2004年 | 693篇 |
2003年 | 593篇 |
2002年 | 540篇 |
2001年 | 494篇 |
2000年 | 468篇 |
1999年 | 468篇 |
1998年 | 252篇 |
1997年 | 210篇 |
1996年 | 247篇 |
1995年 | 121篇 |
1994年 | 130篇 |
1993年 | 90篇 |
1992年 | 180篇 |
1991年 | 142篇 |
1990年 | 117篇 |
1989年 | 130篇 |
1988年 | 112篇 |
1987年 | 70篇 |
1986年 | 45篇 |
1985年 | 61篇 |
1984年 | 51篇 |
1983年 | 37篇 |
1982年 | 30篇 |
1981年 | 37篇 |
1980年 | 34篇 |
1979年 | 28篇 |
1978年 | 21篇 |
1977年 | 11篇 |
1976年 | 13篇 |
1974年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 372 毫秒
1.
2.
3.
4.
5.
6.
《Journal of infection and chemotherapy》2022,28(4):548-553
IntroductionCOVID-19 patients have been reported to have digestive symptoms with poor outcome. Ivermectin, an antiparasitic drug, has been used in COVID-19 patients. The objective of this study was to evaluate whether ivermectin has effects on gastrointestinal complications and ventilator-free days in ventilated patients with COVID-19.MethodsCOVID-19 patients who were mechanically ventilated in the ICU were included in this study. The ventilated patients who received ivermectin within 3 days after admission were assigned to the Ivermectin group, and the others were assigned to the Control group. Patients in the Ivermectin group received ivermectin 200 μg/kg via nasal tube. The incidence of gastrointestinal complications and ventilator-free days within 4 weeks from admission were evaluated as clinical outcomes using a propensity score with the inverse probability weighting method.ResultsWe included 88 patients in this study, of whom 39 patients were classified into the Ivermectin group, and 49 patients were classified into the Control group. The hazard ratio for gastrointestinal complications in the Ivermectin group as compared with the Control group was 0.221 (95% confidence interval [CI], 0.057 to 0.855; p = 0.029) in a Cox proportional-hazard regression model. The odds ratio for ventilator-free days as compared with the Control group was 1.920 (95% CI, 1.076 to 3.425; p = 0.027) in a proportional odds logistic regression model.ConclusionsIvermectin improved gastrointestinal complications and the number of ventilator-free days in severe COVID-19 patients undergoing mechanical ventilation. Prevention of gastrointestinal symptoms by SARS-Cov-2 might be associated with COVID-19 outcome. 相似文献
7.
8.
《Clinical neurophysiology》2022,52(3):232-241
ObjectivesDespite the introduction of several adjuncts to improve spinal perfusion, spinal cord ischemia (SCI) remains a devastating complication of thoracoabdominal aortic aneurysm (TAAA) repair. Our aim was to assess the effects on clinical outcome of interventions triggered by motor evoked potentials (MEP) alerts. Furthermore, we want to assess whether a multimodal intraoperative neurophysiologic monitoring (IONM) protocol is helpful for stratifying patients according to the risk of SCI at the end of the vascular phase of surgery.MethodsWe prospectively studied one-hundred consecutive patients who underwent TAAA repair. We applied a multimodal IONM including MEP, somatosensory evoked potentials (SEP) and peripheral nerve monitoring techniques. Signal deteriorations were classified as reversible/irreversible according to whether they recovered or not at the end of monitoring (EOM), set at the end of the vascular phase of surgery. Significant MEP changes drove a series of corrective measures aimed to improve spinal perfusion.ResultsThe rate of immediate postoperative motor deficits consistent with SCI was significantly higher with irreversible MEP deteriorations compared to reversible ones. The interpretation of MEP findings at the EOM led to the development of risk categories for SCI, based on the association between MEP results and motor outcome.ConclusionsOur data seem to justify interventions made to reverse MEP deterioration in order to improve the clinical outcome. A multimodal IONM protocol could improve MEP interpretation at the end of the vascular phase of surgery, supporting the surgeon in their decision-making, before concluding vascular maneuvers. 相似文献
9.
10.