全文获取类型
收费全文 | 34479篇 |
免费 | 1254篇 |
国内免费 | 88篇 |
专业分类
耳鼻咽喉 | 402篇 |
儿科学 | 1044篇 |
妇产科学 | 843篇 |
基础医学 | 4440篇 |
口腔科学 | 387篇 |
临床医学 | 3017篇 |
内科学 | 5885篇 |
皮肤病学 | 375篇 |
神经病学 | 2060篇 |
特种医学 | 1512篇 |
外科学 | 4634篇 |
综合类 | 92篇 |
现状与发展 | 2篇 |
一般理论 | 27篇 |
预防医学 | 1222篇 |
眼科学 | 592篇 |
药学 | 1580篇 |
中国医学 | 20篇 |
肿瘤学 | 7687篇 |
出版年
2023年 | 338篇 |
2022年 | 547篇 |
2021年 | 674篇 |
2020年 | 649篇 |
2019年 | 542篇 |
2018年 | 369篇 |
2017年 | 461篇 |
2016年 | 456篇 |
2015年 | 615篇 |
2014年 | 950篇 |
2013年 | 894篇 |
2012年 | 1557篇 |
2011年 | 1632篇 |
2010年 | 925篇 |
2009年 | 852篇 |
2008年 | 1745篇 |
2007年 | 2109篇 |
2006年 | 2047篇 |
2005年 | 2034篇 |
2004年 | 1930篇 |
2003年 | 1861篇 |
2002年 | 1749篇 |
2001年 | 1536篇 |
2000年 | 1402篇 |
1999年 | 1167篇 |
1998年 | 265篇 |
1997年 | 164篇 |
1996年 | 270篇 |
1995年 | 231篇 |
1994年 | 165篇 |
1993年 | 180篇 |
1992年 | 893篇 |
1991年 | 850篇 |
1990年 | 871篇 |
1989年 | 814篇 |
1988年 | 713篇 |
1987年 | 311篇 |
1986年 | 87篇 |
1985年 | 135篇 |
1984年 | 143篇 |
1983年 | 137篇 |
1982年 | 119篇 |
1981年 | 82篇 |
1980年 | 92篇 |
1979年 | 83篇 |
1978年 | 84篇 |
1977年 | 66篇 |
1976年 | 25篇 |
排序方式: 共有10000条查询结果,搜索用时 134 毫秒
1.
BackgroundUse of percutaneous mechanical circulatory support has grown exponentially. Vascular complications remain a growing concern and best practices for device removal do not exist. We describe a novel post-closure technique for the next generation Impella CP removal and immediate hemostasis.MethodsThis study is a single center, retrospective, exploratory analysis of 11 consecutive patients receiving an Impella CP for either high-risk PCI or cardiogenic shock and then referred for post-closure compared to 20 patients receiving manual compression for Impella CP removal between 2017 and 2019.ResultsMean age range was 62.7–65.4 years and 50–65% male between groups. Average duration of Impella CP treatment ranged from 3.4 to 5.2 days. Patients referred for post-closure had significantly lower rates of all-cause adverse vascular events (0% versus 40%; n = 0/11 versus n = 8/20; p = 0.01). There was no significant difference in BARC 3 or greater bleeding, transfusion requirement, hospitalization duration or intensive care duration between removal strategies.ConclusionThe novel post-closure technique may significantly reduce vascular complications associated with device removal and may improve clinical outcomes for these critically ill patients. 相似文献
2.
3.
4.
BackgroundFocal liver lesions with spindle cell morphology are rare in the daily practice of pathology. The differential diagnosis is broad, including both tumors and tumor-like lesions. Initial radiologic assessment is sometimes inaccurate. Histopathology is needed to arrive at the correct diagnosis. This study analyzed discrepancies between histopathology and radiologic findings of focal liver lesions with spindle cell morphology.MethodsA six-year retrospective analysis was conducted at a tertiary hospital in Thailand. All focal liver lesions with spindle cell morphology were retrieved. Clinicopathologic features of these cases were analyzed. The pathological diagnosis was rendered primarily based on routine histopathology, using other ancillary studies as an adjunct.Results287 biopsies and 151 resection specimens with focal liver lesions were identified. In 12 (2.7%) cases, tumors or tumor-like lesions with spindle cell morphology were retrieved. A total of five cases had discrepancies between histopathology and radiologic findings. These lesions encompassed primary liver tumors (EBV-associated smooth muscle tumor and leiomyosarcoma); metastatic tumors (gastrointestinal stromal tumor, small cell neuroendocrine carcinoma); and a tumor-like lesion (endometriosis). Several morphologic findings (i.e., cytologic grades, dense and loose areas, intratumoral lymphocytes, distinct perinuclear vacuoles, and hemosiderin) are important clues to diagnose these spindle cell lesions.ConclusionsPathologists play a critical role in diagnosing focal liver lesions with spindle cell morphology, particularly those with limited clinical data at the initial presentation. A thorough evaluation of histomorphology on routine hematoxylin and eosin-stained slides is essential for correct diagnosis. 相似文献
5.
6.
7.
8.
9.
10.