全文获取类型
收费全文 | 12459篇 |
免费 | 1675篇 |
国内免费 | 290篇 |
专业分类
耳鼻咽喉 | 57篇 |
儿科学 | 482篇 |
妇产科学 | 397篇 |
基础医学 | 1169篇 |
口腔科学 | 558篇 |
临床医学 | 1703篇 |
内科学 | 1736篇 |
皮肤病学 | 91篇 |
神经病学 | 1618篇 |
特种医学 | 259篇 |
外国民族医学 | 2篇 |
外科学 | 987篇 |
综合类 | 1649篇 |
预防医学 | 1575篇 |
眼科学 | 152篇 |
药学 | 593篇 |
26篇 | |
中国医学 | 360篇 |
肿瘤学 | 1010篇 |
出版年
2024年 | 8篇 |
2023年 | 303篇 |
2022年 | 331篇 |
2021年 | 610篇 |
2020年 | 774篇 |
2019年 | 666篇 |
2018年 | 615篇 |
2017年 | 637篇 |
2016年 | 606篇 |
2015年 | 545篇 |
2014年 | 915篇 |
2013年 | 944篇 |
2012年 | 873篇 |
2011年 | 734篇 |
2010年 | 567篇 |
2009年 | 555篇 |
2008年 | 519篇 |
2007年 | 546篇 |
2006年 | 471篇 |
2005年 | 413篇 |
2004年 | 333篇 |
2003年 | 324篇 |
2002年 | 278篇 |
2001年 | 240篇 |
2000年 | 174篇 |
1999年 | 151篇 |
1998年 | 158篇 |
1997年 | 124篇 |
1996年 | 109篇 |
1995年 | 117篇 |
1994年 | 104篇 |
1993年 | 92篇 |
1992年 | 82篇 |
1991年 | 68篇 |
1990年 | 53篇 |
1989年 | 61篇 |
1988年 | 48篇 |
1987年 | 30篇 |
1986年 | 25篇 |
1985年 | 39篇 |
1984年 | 31篇 |
1983年 | 18篇 |
1982年 | 21篇 |
1981年 | 20篇 |
1980年 | 15篇 |
1979年 | 11篇 |
1977年 | 9篇 |
1976年 | 10篇 |
1969年 | 7篇 |
1968年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Background: Breast cancer (BC) is the most common malignant tumor in women, and its morbidity and mortality are
increasing each year, due to the lack of specific clinical symptoms in the early stage of BC, and the lack of diagnostic
methods for early breast cancer. Therefore, identifying an effective diagnostic method for early BC has become urgent.
Materials and Methods: Breast lesions with a histological diagnosis that were examined by ultrasonic elastography
(UE) in our department from June 2020 to December 2021 were reviewed. qRT-PCR was performed to measure
the expression levels of miR-144-5p and miR-26b-5p in the plasma of patients with BC. The receiver operating characteristics (ROC) curve and area under the curve (AUC) were used to investigate the potential diagnostic value of miR-
144-5p, miR-26b-5p and the elastographic score in BC. Results: The ultrasonic elastography score(UES) was found to
be significantly upregulated in BC compared with that in benign breast lesions, and the AUC, sensitivity and specificity
were 0.809, 0.717 and 0.806 for distinguishing BC from benign breast lesions, respectively. miR-144-5p and miR-26b-
5p were found to be upregulated in the plasma of BC patients, and miR-144-5p+miR-26b-5p had 0.781 sensitivity and
0.780 specificity for the diagnosis of BC. Furthermore, we found that the diagnostic performance of miR-144-5p and
miR-26b-5p combined with UES for BC had 0.913 sensitivity and 0.890 specificity. Conclusions: The combination of
plasma miR-144-5p, miR-26b-5p and UES has a very high clinical application value for the early detection of BC. 相似文献
4.
儿童早期发展是从受精卵到8岁儿童体格、心理和社会能力的生长和发育,其发展过程受到遗传、环境等多方面影响。其中,新生儿的优质营养是儿童早期发展的重要物质基础,新生儿期的母乳喂养、新生儿疾病的筛查、早产儿和低出生体重儿的合理喂养都是促进儿童早期发展的关键之一。本文将从新生儿营养的角度,全面总结其对儿童早期发展的作用,为更好地优化母婴营养,促进儿童早期发展提供新的方向与参考。 相似文献
5.
Henrik Linde Vilhelmas Bartusevicius Åke Norberg Fredrik Klevebro Jonathan Grip 《Acta anaesthesiologica Scandinavica》2023,67(3):277-283
Background
Esophagectomy is a major surgical intervention and a cornerstone in the treatment of esophageal cancer. There is clinical experience that blood lactate concentration often is elevated in the period following esophagectomy, but the incidence and clinical consequences are sparsely studied.Methods
We extracted data from all patients undergoing esophagectomy at Karolinska University Hospital 2016–2018, n = 153. Most were performed with minimally invasive technique, n = 130. Blood lactate values directly after surgery, highest value during the first night, and morning level on postoperative day one were recorded. Primary outcome was hospital length of stay and secondary outcome was a composite of postoperative infection, additional surgery, or intensive care during the hospital stay. Development of anastomotic leak was analyzed separately.Results
Postoperative hyperlactatemia was common as 93% of patients had peak lactate concentration >1.6 mmol/L and 27% >3.5 mmol/L in the first night following operation. Median hospital length of stay was 14 days. Blood lactate showed a weak correlation to hospital stay and intensive care the morning following surgery, but not at arrival to postoperative ward. There were no statistical differences between those with and without anastomotic leak at any of the time points. Elevated lactate in the first 12–16 h postoperatively was related to surgical factors (open technique, surgery time, and perioperative bleeding) but not to patient related factors (ASA-class, Charlson comorbidity index, sex, age) or cumulative fluid balance.Conclusion
In conclusion, elevated blood lactate in the immediate time following esophagectomy showed a weak association to intensive care and length of stay but not anastomotic leak. 相似文献6.
随着医疗救治水平的不断提高,早产儿的存活率明显增加,但早产常易伴发脑性瘫痪、运动和认知障碍等一系列神经发育问题,给家庭、社会带来沉重负担。生命早期大脑发育迅速,可塑性强,是进行早期运动干预的良好时机。本文就早产儿早期神经运动干预进行综述,旨在为临床医护人员对早产儿进行适宜有效的运动干预提供参考。 相似文献
7.
Raymond J. Chan RN PhD Vivienne E. Milch MBBS MHPol Fiona Crawford-Williams PhD Oluwaseyifunmi Andi Agbejule BRadTherapy Ria Joseph MNutrDiet Jolyn Johal BND Narayanee Dick BSc Matthew P. Wallen PhD Julie Ratcliffe PhD Anupriya Agarwal MBBS Larissa Nekhlyudov MD Matthew Tieu PhD Manaf Al-Momani BPharm Scott Turnbull PhD Rahul Sathiaraj MPH Dorothy Keefe MBBS MD Nicolas H. Hart PhD 《CA: a cancer journal for clinicians》2023,73(6):565-589
Patient navigation is a strategy for overcoming barriers to reduce disparities and to improve access and outcomes. The aim of this umbrella review was to identify, critically appraise, synthesize, and present the best available evidence to inform policy and planning regarding patient navigation across the cancer continuum. Systematic reviews examining navigation in cancer care were identified in the Cochrane Central Register of Controlled Trials (CENTRAL), PubMed, Embase, Cumulative Index of Nursing and Allied Health (CINAHL), Epistemonikos, and Prospective Register of Systematic Reviews (PROSPERO) databases and in the gray literature from January 1, 2012, to April 19, 2022. Data were screened, extracted, and appraised independently by two authors. The JBI Critical Appraisal Checklist for Systematic Review and Research Syntheses was used for quality appraisal. Emerging literature up to May 25, 2022, was also explored to capture primary research published beyond the coverage of included systematic reviews. Of the 2062 unique records identified, 61 systematic reviews were included. Fifty-four reviews were quantitative or mixed-methods reviews, reporting on the effectiveness of cancer patient navigation, including 12 reviews reporting costs or cost-effectiveness outcomes. Seven qualitative reviews explored navigation needs, barriers, and experiences. In addition, 53 primary studies published since 2021 were included. Patient navigation is effective in improving participation in cancer screening and reducing the time from screening to diagnosis and from diagnosis to treatment initiation. Emerging evidence suggests that patient navigation improves quality of life and patient satisfaction with care in the survivorship phase and reduces hospital readmission in the active treatment and survivorship care phases. Palliative care data were extremely limited. Economic evaluations from the United States suggest the potential cost-effectiveness of navigation in screening programs. 相似文献
8.
9.
10.
目的 探讨协同式早期运动干预在腹腔镜结直肠癌手术患者中的应用效果。方法 使用随机数字表法将2020年5月-2021年5月于笔者所在医院进行腹腔镜结直肠癌手术的84例患者分为对照组和干预组,各42例。对照组术后采用常规运动干预,干预组术后采用协同式早期运动干预。比较2组术后恢复情况、身体状况、术后并发症发生情况。结果 干预组首次下床活动时间、术后排气时间、术后排便时间均早于对照组(χ2=11.823,P=0.001;χ2=4.687,P=0.001;χ2=7.611,P=0.001),术后7d干预组的多维度疲劳量表评分低于对照组(t=2.000,P=0.049),杜克活动指数高于对照组(t=2.256,P=0.027),2组术后并发症发生率比较,差异无统计学意义(χ2=0.343,P=0.558)。结论 协同式早期运动干预能够促进腹腔镜结直肠癌手术患者术后恢复,改善身体状况,值得推广应用。 相似文献