全文获取类型
收费全文 | 14341篇 |
免费 | 1075篇 |
国内免费 | 260篇 |
专业分类
耳鼻咽喉 | 26篇 |
儿科学 | 504篇 |
妇产科学 | 225篇 |
基础医学 | 661篇 |
口腔科学 | 46篇 |
临床医学 | 3395篇 |
内科学 | 2540篇 |
皮肤病学 | 110篇 |
神经病学 | 875篇 |
特种医学 | 799篇 |
外国民族医学 | 1篇 |
外科学 | 2493篇 |
综合类 | 1909篇 |
现状与发展 | 2篇 |
预防医学 | 569篇 |
眼科学 | 104篇 |
药学 | 787篇 |
12篇 | |
中国医学 | 176篇 |
肿瘤学 | 442篇 |
出版年
2024年 | 23篇 |
2023年 | 264篇 |
2022年 | 395篇 |
2021年 | 627篇 |
2020年 | 627篇 |
2019年 | 575篇 |
2018年 | 558篇 |
2017年 | 584篇 |
2016年 | 566篇 |
2015年 | 514篇 |
2014年 | 1095篇 |
2013年 | 1083篇 |
2012年 | 842篇 |
2011年 | 859篇 |
2010年 | 752篇 |
2009年 | 690篇 |
2008年 | 653篇 |
2007年 | 646篇 |
2006年 | 615篇 |
2005年 | 508篇 |
2004年 | 395篇 |
2003年 | 352篇 |
2002年 | 301篇 |
2001年 | 263篇 |
2000年 | 208篇 |
1999年 | 147篇 |
1998年 | 147篇 |
1997年 | 159篇 |
1996年 | 131篇 |
1995年 | 136篇 |
1994年 | 95篇 |
1993年 | 84篇 |
1992年 | 104篇 |
1991年 | 71篇 |
1990年 | 64篇 |
1989年 | 50篇 |
1988年 | 59篇 |
1987年 | 49篇 |
1986年 | 49篇 |
1985年 | 70篇 |
1984年 | 56篇 |
1983年 | 33篇 |
1982年 | 40篇 |
1981年 | 31篇 |
1980年 | 24篇 |
1979年 | 16篇 |
1978年 | 16篇 |
1977年 | 13篇 |
1976年 | 11篇 |
1975年 | 9篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
《Journal of vascular and interventional radiology : JVIR》2020,31(4):635-643
PurposeThis study evaluated the factors affecting contralateral and ipsilateral recurrent deep vein thrombosis (DVT) after iliac vein stent placement in patients with iliac vein compression syndrome (IVCS).Materials and MethodsData from 130 patients (95 female patients) who underwent catheter-directed thrombolysis and stent placement for IVCS with left lower leg thrombosis at a single institution were retrospectively analyzed. Mean patient age was 69.0 ± 14.0 years old. Median follow-up was 14 months (range, 3–164 months). Anticoagulation therapy was prescribed for 6 months, followed by lifelong antiplatelet therapy. Multivariate logistic regression analysis was performed to evaluate the factors affecting the development of contralateral and ipsilateral recurrent DVT.ResultsSeven patients (5.4%) developed contralateral DVT (median, 26 months; range, 2–61 months), and 11 patients (8.5%) developed ipsilateral DVT (median, 1 month; range, 0–53 months). Stent location (odds ratio [OR], 11.564; 95% confidence interval [CI], 1.159–115.417) and in-stent thrombosis during follow-up (OR, 15.142; 95% CI, 1.406–163.119) were predictors of recurrent contralateral DVT. Thrombophilia (OR, 47.560; 95% CI, 2.369–954.711), remaining inferior vena cava filter (OR, 30.552; 95% CI, 3.495–267.122), and in-stent thrombosis during follow-up (OR, 82.057; 95% CI, 2.915–2309.848) were predictors of ipsilateral DVT.ConclusionsContralateral DVT occurs late and is associated with extension of the iliac vein stent to the inferior vena cava and in-stent thrombosis. Ipsilateral DVT occurs relatively early and is associated with thrombophilia, remaining inferior vena cava filter, and in-stent thrombosis. 相似文献
24.
《Journal of Clinical Orthopaedics and Trauma》2021,12(6):976-982
ObjectiveMultiple treatment options for acetabular fractures in geriatric patients exist. However, no large-scale studies have reported the outcomes of acute total hip arthroplasty (THA) in this patient population. We systematically evaluated all available evidence to characterize clinical outcomes, complications, and revisions of acute THA for acetabular fractures in geriatric patients.MethodsMeta-analysis of 21 studies of 430 acetabular fractures with mean follow-up of 44 months (range, 17−97 months). Two independent researchers searched and evaluated the databases of Ovid, Embase, and United States National Library of Medicine using a Boolean search string up to December 2019. Population demographics and complications, including presence of heterotopic ossification (HO), dislocation, infection, revision rate, neurological deficits, and venous thromboembolic event (VTE), were recorded and analyzed.ResultsWeighted mean Harris Hip Score was 83.3 points, and 20% of the patients had reported complications. The most common complication was HO, with a rate of 19.5%. Brooker grade III and IV HO rates were lower at 6.8%. Hip dislocation occurred at a rate of 6.1%, 4.1% of patients developed VTE, deep infection occurred in 3.8%, and neurological complications occurred in 1.9%. Although the revision rate was described in most studies, we were unable to perform a survival analysis because the time to each revision was described in only a few studies. The revision rate was 4.3%.ConclusionsAcute THA is a viable option for treatment of acetabular fracture and can result in acceptable clinical outcomes and survivorship rates in older patients but with an associated complication rate of approximately 20%. Considering the limited treatment options, THA might be a viable alternative for appropriately selected patients. 相似文献
25.
26.
带浅静脉干逆行皮瓣早期微血管构筑变化的体视学研究 总被引:4,自引:0,他引:4
目的 探讨带浅静脉干的逆行皮瓣早期微血管构筑变化的特点以供临床实践参考。方法 应用生物体视学技术测量带浅静脉干皮瓣微血管体积密度,结合组织学观察,与不带静脉干皮瓣作对照比较。结果 带浅静脉干皮瓣组微血管密度整体水平高于不带静脉干皮瓣组(P〈0.05)。结论 浅静脉干的存在有利于皮瓣的血管化进程,保留浅静脉干对皮瓣成活有利。 相似文献
27.
Y. Patrice Le Treut M.D. Jean Hardwigsen M.D. Pascal Ananian M.D. Jean Saïsse M.D. Emilie Grégoire M.D. Hubert Richa M.D. Pierre Campan M.D. 《Journal of gastrointestinal surgery》2006,10(6):855-862
Tumor thrombus in major vasculature is a frequent finding with a poor long-term prognosis in patients with hepatocellular
carcinoma (HCC). The utility of surgical resection is still controversial. This study compared morbidity and survival after
resection for HCC with and without tumor thrombus. Data of 108 patients who underwent major hepatic resection for HCC were
prospectively recorded. Patients were divided into two groups. The venous thrombectomy (VT) group included 26 patients who
had HCC with tumor thrombus in the portal or hepatic veins. The matched control group included 82 patients who had HCC without
tumor thrombus. Surgical technique, early outcome, and late survival were analyzed in each group. Multivariate analysis was
performed to assess the prognostic value of this feature. Surgical technique was comparable in the VT and control group with
regard to extent of hepatectomy, procedure duration, and transfusion requirements. Early postoperative outcome was also comparable.
Actuarial survival at 1, 3, and 5 years was 38%, 20%, and 13%, respectively, in the VT group (median: 9 months) versus 74%,
56%, and 33%, respectively, in the control group (median: 41 months). In the subgroup of patients with tumor thrombus limited
to the portal vein, actuarial survival at 1, 3, and 5 years was 50%, 26%, and 17%, respectively, (median: 12 months) and two
patients lived longer than 5 years. Multivariate analysis showed that incomplete resection, alphafetoprotein level greater
than 100 N, more than two tumor nodules, and tumor thrombus in major vasculature were independent factors of poor prognosis.
Survival after resection for HCC with tumor thrombus in the major vasculature is poorer than after resection for HCC without
tumor thrombus. However, an aggressive surgical strategy can provide significant survival with comparable morbidity in selected
cases, that is, tumor thrombus located in the portal vein only and expected complete resection of the lesions. 相似文献
28.
Joachim Dissemond Andreas Krber Stephan Grabbe 《Journal der Deutschen Dermatologischen Gesellschaft》2006,4(8):627-634
In Germany about 0.7 % of the adult population have a chronic leg ulcer. Although chronic venous insufficiency accounts for at least 80 % of all chronic leg ulcers, knowledge of the relevant differential diagnostic considerations is of crucial importance, in particular for patients who are refractory to therapy. In addition to vascular disease, other causes include neuropathic, metabolic, hematologic and exogenous factors as well as neoplasias, infections, drugs, genetic defects and some primary skin disorders. For the long‐term successful treatment of patients with chronic leg ulcers, it is necessary to identify all relevant factors, in order to enable a pathogenesis‐oriented, interdisciplinary therapeutic approach. 相似文献
29.
目的研究腹内压升高对大鼠中心静脉压和门静脉压的影响。方法将20只成年雄性SD大鼠分别通过颈静脉插管、穿刺门静脉主干法来测定中心静脉压和门静脉压,运用氮气气腹法制作大鼠腹内高压动物模型。建立气腹后分别在0、5、10、15、20、25、30、35、40、45mmHg压力值下测得中心静脉压和门静脉压。结果中心静脉压和腹内压之间的直线回归方程为Y=2.824+0.045X,相关系数r=0.984(P〈0.01);门静脉压和腹内压之间的直线回归方程为Y=8.887+0.939X,相关系数r=0.998(P〈0.01)。结论腹内压与中心静脉压和门静脉压有很好的相关性,可以根据腹内压监测中心静脉压和门静脉压的变化。 相似文献
30.