全文获取类型
收费全文 | 1049502篇 |
免费 | 80803篇 |
国内免费 | 6728篇 |
专业分类
耳鼻咽喉 | 13403篇 |
儿科学 | 35204篇 |
妇产科学 | 29045篇 |
基础医学 | 150625篇 |
口腔科学 | 28682篇 |
临床医学 | 97131篇 |
内科学 | 200651篇 |
皮肤病学 | 23276篇 |
神经病学 | 81563篇 |
特种医学 | 40185篇 |
外国民族医学 | 338篇 |
外科学 | 154255篇 |
综合类 | 34278篇 |
现状与发展 | 18篇 |
一般理论 | 387篇 |
预防医学 | 81954篇 |
眼科学 | 23904篇 |
药学 | 77828篇 |
71篇 | |
中国医学 | 5942篇 |
肿瘤学 | 58293篇 |
出版年
2021年 | 9906篇 |
2019年 | 9239篇 |
2018年 | 12487篇 |
2017年 | 10171篇 |
2016年 | 11122篇 |
2015年 | 13310篇 |
2014年 | 17532篇 |
2013年 | 24915篇 |
2012年 | 33236篇 |
2011年 | 35291篇 |
2010年 | 21601篇 |
2009年 | 20105篇 |
2008年 | 31762篇 |
2007年 | 33173篇 |
2006年 | 33533篇 |
2005年 | 31945篇 |
2004年 | 30582篇 |
2003年 | 29370篇 |
2002年 | 28142篇 |
2001年 | 48015篇 |
2000年 | 49013篇 |
1999年 | 41195篇 |
1998年 | 11740篇 |
1997年 | 10619篇 |
1996年 | 10593篇 |
1995年 | 10209篇 |
1994年 | 9433篇 |
1993年 | 8687篇 |
1992年 | 32485篇 |
1991年 | 31659篇 |
1990年 | 31167篇 |
1989年 | 29999篇 |
1988年 | 27302篇 |
1987年 | 27432篇 |
1986年 | 25504篇 |
1985年 | 24659篇 |
1984年 | 18427篇 |
1983年 | 15538篇 |
1982年 | 9307篇 |
1979年 | 16873篇 |
1978年 | 12225篇 |
1977年 | 10316篇 |
1976年 | 9755篇 |
1975年 | 10181篇 |
1974年 | 12318篇 |
1973年 | 11846篇 |
1972年 | 10887篇 |
1971年 | 10115篇 |
1970年 | 9378篇 |
1969年 | 8726篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Anuj Shrestha Zeeshan Jawa Kathryn L. Koch Amy B. Rankin Qun Xiang Anand Padmanabhan Matthew S. Karafin Joshua J. Field 《Journal of clinical apheresis》2015,30(6):353-358
Red cell exchange (RCE) is a common procedure in adults with sickle cell disease (SCD). Implantable dual lumen Vortex (DLV) ports can be used for RCE in patients with poor peripheral venous access. We performed a retrospective cohort study of RCE procedures performed in adults with SCD. The main objective of the study was to compare the inlet speed, duration of procedures and rate of complications performed through DLV ports to those performed through temporary central venous and peripheral catheters. Twenty‐nine adults with SCD underwent a total of 318 RCE procedures. Twenty adults had DLV ports placed and 218 procedures were performed using DLV ports. Mean length of follow‐up after DLV port placement was 397 ± 263 days. Six DLV ports were removed due to infection and 1 for malfunction after a mean of 171 ± 120 days. Compared to temporary central venous and peripheral catheters, DLV port procedures had a greater rate of procedural complications, a longer duration, and a lower inlet speed (all P < 0.01). When accounting for the maximum allowable inlet speed to avoid citrate toxicity, 40% of DLV port procedures were greater than 10% below maximum speed, compared to 7 and 14% of procedures performed through temporary central venous and peripheral catheters (P < 0.0001). In conclusion, DLV ports can be used for RCE in adults with SCD, albeit with more procedural complications and longer duration. The smaller internal diameter and longer catheter of DLV ports compared to temporary central venous catheters likely accounts for the differences noted. J. Clin. Apheresis 30:353–358, 2015. © 2015 Wiley Periodicals, Inc. 相似文献
32.
33.
The objective of this study was to investigate short segment decompression of degenerative lumbar scoliosis (DLS) and the efficiency of fusion treatment.After DLS surgery, the patients were retrospectively reviewed using the VAS (visual analog scale) and ODI (Oswestry Disability Index) to assess clinical outcomes. All patients underwent posterior lumbar decompressive laminectomy, pedicle screw internal fixation, and posterolateral bone graft fusion surgery. Radiographic measurements included the scoliotic Cobb angle, the fused Cobb angle, the anterior intervertebral angle (AIA), the sagittal intervertebral angle (SIA), and lumbar lordosis angle. The relationships between these parameters were examined by bivariate Pearson analysis and linear regression analysis.Preoperatively, the Cobb angle at the scoliotic segment was 15.4°, which decreased to 10.2° immediately following surgery (P < 0.05). The AIA significantly increased by the last follow-up (4.4 ± 3.4) compared with pre- and postoperative values (2.5 ± 2.8 and 2.2 ± 2.4, respectively; P < 0.05). However, the scoliotic Cobb angle and the AIA did not correlate with the VAS or ODI scores. At the final follow-up, no patients had pseudoarthrosis or internal instrumentation-related complications.Short fusion surgical treatment results in limited DLS correction, with correction loss over time. The AIA between the upper adjacent segment and proximal fused vertebra continues to increase postoperatively, which does not exacerbate clinical symptoms, as reflected by the low reoperation rates for repairing degeneration at adjacent levels. 相似文献
34.
35.
Discordant Electrocardiogram Left Ventricular Wall Thickness and Strain Findings in Influenza Myocarditis 下载免费PDF全文
Nael Hawwa M.D. Zoran B. Popovic M.D. Ph.D. Hussain A. Isma'eel M.D. 《Echocardiography (Mount Kisco, N.Y.)》2015,32(12):1880-1884
A 42‐year‐old man presented with a viral prodrome and tested positive for influenza A. He rapidly deteriorated developing cardiogenic shock, rhabdomyolysis, and acute kidney injury. Patient improved 1 week later with supportive measures including vasopressors, inotropes, and an intraaortic balloon pump. We report this case as it highlights the discordance between echocardiographic ventricular wall thickening as a result of myocardial edema, and electrocardiographic findings at presentation, with a reversal in findings at time of resolution. Additionally, there was some suggestion of a regional pattern to the reduced longitudinal strain. 相似文献
36.
37.
38.
39.
40.
Assessment of Myocardial Infarct Size by Three‐Dimensional and Two‐Dimensional Speckle Tracking Echocardiography: A Comparative Study to Single Photon Emission Computed Tomography 下载免费PDF全文