全文获取类型
收费全文 | 253837篇 |
免费 | 20155篇 |
国内免费 | 7955篇 |
专业分类
耳鼻咽喉 | 1264篇 |
儿科学 | 8754篇 |
妇产科学 | 1959篇 |
基础医学 | 22485篇 |
口腔科学 | 3665篇 |
临床医学 | 28088篇 |
内科学 | 66930篇 |
皮肤病学 | 2755篇 |
神经病学 | 26677篇 |
特种医学 | 7400篇 |
外国民族医学 | 4篇 |
外科学 | 19903篇 |
综合类 | 36167篇 |
现状与发展 | 32篇 |
一般理论 | 11篇 |
预防医学 | 18869篇 |
眼科学 | 2393篇 |
药学 | 18723篇 |
204篇 | |
中国医学 | 11841篇 |
肿瘤学 | 3823篇 |
出版年
2024年 | 571篇 |
2023年 | 4850篇 |
2022年 | 8218篇 |
2021年 | 12937篇 |
2020年 | 12289篇 |
2019年 | 9552篇 |
2018年 | 9399篇 |
2017年 | 9275篇 |
2016年 | 9499篇 |
2015年 | 9276篇 |
2014年 | 17706篇 |
2013年 | 19376篇 |
2012年 | 14512篇 |
2011年 | 15801篇 |
2010年 | 12453篇 |
2009年 | 12037篇 |
2008年 | 11991篇 |
2007年 | 11860篇 |
2006年 | 10466篇 |
2005年 | 8850篇 |
2004年 | 7478篇 |
2003年 | 6556篇 |
2002年 | 5559篇 |
2001年 | 4898篇 |
2000年 | 4031篇 |
1999年 | 3591篇 |
1998年 | 3316篇 |
1997年 | 2993篇 |
1996年 | 2636篇 |
1995年 | 2357篇 |
1994年 | 2211篇 |
1993年 | 1865篇 |
1992年 | 1774篇 |
1991年 | 1574篇 |
1990年 | 1255篇 |
1989年 | 1113篇 |
1988年 | 1009篇 |
1987年 | 921篇 |
1986年 | 807篇 |
1985年 | 944篇 |
1984年 | 809篇 |
1983年 | 482篇 |
1982年 | 578篇 |
1981年 | 493篇 |
1980年 | 394篇 |
1979年 | 328篇 |
1978年 | 269篇 |
1977年 | 233篇 |
1976年 | 200篇 |
1975年 | 94篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
《Journal of Evidence》2019,19(2):131-139
ObjectivesThe aims of this article are to identify all the published systematic reviews (SRs) and meta-analyses (MAs) that studied the relationship between periodontal and systemic diseases and to assess their quality using 2 scales (the Overview Quality Assessment Questionnaire [OQAQ] and A Measurement Tool to Assess Systematic Reviews [AMSTAR] checklist).MethodsFor SRs and MAs to be included, they should have investigated one of the following systemic diseases: pulmonary conditions, cardiac conditions, endocrine conditions, cancer, blood disorders, psychological conditions, anxiety, depression, mood disorders, and several other diseases. Two investigators screened MEDLINE via PubMed, Embase, Scopus, Web of Science, and the Cochrane Database of Systematic Reviews. The tools used to evaluate quality were the AMSTAR scale and OQAQ. The protocol was prospectively registered in PROSPERO (CRD42018102208).ResultsThe search strategy found 691 unique articles, 42 of which met the eligibility criteria and were included in this review. Diabetes mellitus was the most investigated disease (14 out of 42 studies), followed by obesity (11 studies) and cardiovascular diseases (5 studies). A total of 40 reviews reported on the characteristics of included studies, and, as per the AMSTAR scale, 39 reviews had an a priori design. The number of reviews that fulfilled the status of publication criterion was the lowest (7 reviews only), followed by the number used in the assessment of publication bias (11 reviews). The number of high-quality reviews was higher with the OQAQ than with the AMSTAR checklist (33 vs 25 studies), but the AMSTAR showed a higher number of medium-quality reviews than the OQAQ (14 vs 6 studies). Both showed the same number of low-quality reviews.ConclusionsHigh-quality SRs and MAs are crucial to understanding the relationship between systemic and periodontal diseases. Medical practitioners must be able to inform patients about oral health and specific periodontal health concerns. 相似文献
43.
44.
目的:调查心脏瓣膜置换术后患者的出院准备度现状,并分析其影响因素。方法:于2018年9月至2019年3月用一般资料、出院准备度量表、出院指导质量量表对139例瓣膜置换术后患者进行调查。结果:心脏瓣膜置换术后患者的出院准备度总分为(89.51±8.53)分,与出院指导质量呈正相关;多元回归分析显示,主要照顾者、婚姻状况、工作状态、服药种类、出院指导质量为出院准备度影响因素。结论:心脏瓣膜置换术后患者的出院准备度有待提高,患者感知的个人状态得分不理想;护士应鼓励患者配合进行早期康复,强化出院指导,采取有效措施提供康复信息,满足患者及其家属需求,提高出院准备度。 相似文献
45.
背景 慢性阻塞性肺疾病(COPD)患者肺栓塞(PE)发生率显著高于常人,但目前不伴红细胞增多的COPD患者并发PE的机制尚不明确。目的 探讨不伴红细胞增多的COPD患者并发PE的影响因素。方法 本研究为回顾性病例对照研究。收集2017年1-12月在新疆医科大学第一附属医院呼吸与呼吸危重症中心住院治疗的血红蛋白(Hb)≤140 g/L的COPD患者。依据肺多层螺旋CT肺血管成像(CTPA)检查结果将患者分为并发PE组和单纯COPD组。记录患者的年龄、性别、合并症、服用抗血小板或抗凝药物史。采用倾向性评分匹配(PSM)方法,通过二元Logistic回归分析估计倾向性评分值,采用1∶1最邻近原则匹配,卡钳值为0.05,筛选出基线相同的两组病例。记录患者的D-二聚体、血常规检查结果,比较两组间差异;分析不伴红细胞增多的COPD患者并发PE的影响因素,红细胞分布宽度(RDW)与中性粒细胞/淋巴细胞比值(NLR)的相关性。结果 共纳入病例339例,其中单纯COPD组289例,并发PE组50例。采用PSM方法筛选两组患者,最终得到单纯COPD组、并发PE组各50例进行后续研究。并发PE组患者D-二聚体、中性粒细胞计数(N)、RDW、NLR高于单纯COPD组,淋巴细胞计数(L)低于单纯COPD组(P<0.05)。二元Logistic回归分析结果显示,RDW是不伴红细胞增多的COPD患者并发PE的影响因素〔OR=1.561,95%CI(1.096,2.225),P<0.05〕。Spearman秩相关分析结果显示,不伴红细胞增多的COPD患者RDW与NLR呈正相关(rs=0.225,P<0.05)。结论 RDW升高是Hb≤140 g/L的COPD患者并发PE的危险因素,且RDW与NLR呈正相关。 相似文献
46.
《The Journal for Nurse Practitioners》2019,15(1):65-72
Valvular heart disease affects patients of all ages, with the highest incidence in patients older than 75 years. The nurse practitioner, whether in the primary or acute care setting, plays a vital role in the detection, monitoring, and shared decisions in treatment options. Assessment skills in conjunction with appropriate testing can identify patients early in the trajectory of the disease. The purpose of this article is to provide tips for history-taking and physical exam techniques, identify appropriate diagnostic testing, and review treatment options for adults with valvular heart disease. 相似文献
47.
48.
49.
50.
AimsThe effect of Origanum majorana tea consumption on motor and non-motor symptoms was investigated in patients with idiopathic Parkinson's disease, measured by validated tools.MethodsSixty patients with idiopathic Parkinson's disease and under conventional medication were enrolled voluntarily in the study. All participants were randomized on double-blind to placebo or Origanum majorana. Clinical assessment with validated tools (UPDRSIII, NMSS, and BDI) was done before Origanum majorana or placebo consumption (Day 0) and at the end of the experiment (Day 30).ResultsThe treatment groups were similar at baseline on demographic and clinical variables. During the course of study, nine participants withdrew for reasons of noncompliance and inability to follow-up. Fifty-one participants completed the study. Upon completion of 30 days of treatment, Origanum majorana tea consumption did not decrease the UPDRSIII score ([UPDRSIII] D0 = 18.76 ± 8.58, D30 = 16.52 ± 7.96, p = 0.069) at the p value was 0.07. However, a statistically significant improvement was noted in NMSS and BDI scores (p < 0.0001 and p < 0.0001, respectively). Assessment of the UPDRSIII, NMSS and BDI scores of the patients did not reflect any improvement with placebo. No side effect was detected during the study.ConclusionThese findings show improvement of depressive and non-motor signs in patients with Parkinson's disease in the group that consumed Origanum majorana tea in combination with conventional therapy. Improvement of motor signs may need an extended treatment period. However, more research with a large number of participants and lasting longer than 1 month is needed to argue these findings. 相似文献