全文获取类型
收费全文 | 3589篇 |
免费 | 184篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 38篇 |
儿科学 | 58篇 |
妇产科学 | 60篇 |
基础医学 | 480篇 |
口腔科学 | 76篇 |
临床医学 | 297篇 |
内科学 | 617篇 |
皮肤病学 | 46篇 |
神经病学 | 247篇 |
特种医学 | 512篇 |
外科学 | 767篇 |
综合类 | 8篇 |
预防医学 | 105篇 |
眼科学 | 53篇 |
药学 | 170篇 |
中国医学 | 3篇 |
肿瘤学 | 256篇 |
出版年
2023年 | 62篇 |
2022年 | 115篇 |
2021年 | 174篇 |
2020年 | 91篇 |
2019年 | 106篇 |
2018年 | 150篇 |
2017年 | 110篇 |
2016年 | 130篇 |
2015年 | 117篇 |
2014年 | 169篇 |
2013年 | 192篇 |
2012年 | 291篇 |
2011年 | 264篇 |
2010年 | 143篇 |
2009年 | 117篇 |
2008年 | 177篇 |
2007年 | 192篇 |
2006年 | 140篇 |
2005年 | 119篇 |
2004年 | 85篇 |
2003年 | 95篇 |
2002年 | 113篇 |
2001年 | 33篇 |
2000年 | 26篇 |
1999年 | 27篇 |
1998年 | 20篇 |
1997年 | 12篇 |
1996年 | 15篇 |
1995年 | 10篇 |
1994年 | 9篇 |
1993年 | 10篇 |
1992年 | 21篇 |
1991年 | 17篇 |
1990年 | 15篇 |
1989年 | 13篇 |
1988年 | 20篇 |
1987年 | 17篇 |
1984年 | 14篇 |
1982年 | 11篇 |
1981年 | 10篇 |
1980年 | 9篇 |
1979年 | 12篇 |
1977年 | 11篇 |
1976年 | 11篇 |
1975年 | 17篇 |
1974年 | 22篇 |
1973年 | 12篇 |
1972年 | 13篇 |
1970年 | 12篇 |
1968年 | 14篇 |
排序方式: 共有3793条查询结果,搜索用时 15 毫秒
1.
Stephan Koter Tina U. Cohnert Korbinian B. Hindermayr Jörg Lindenmann Maximilian Brückner Wolfgang K. Oswald Georg Werkgartner Doris Wagner 《Journal of vascular surgery》2019,69(4):1227-1232
Objective
Low psoas muscle area is shown to be an indicator for worse postoperative outcome in patients undergoing vascular surgical. Additionally, it has been associated with longer durations of hospital stay in patients with cancer who undergo surgery and subsequently greater health care costs in Europe and the United States. We sought to evaluate this effect on hospital expenditure for patients undergoing vascular repair in a health care system with universal access.Methods
Skeletal muscle mass was assessed on preoperative abdominal computed tomography scans of patients undergoing open aortic aneurysm repair in a retrospective fashion. The skeletal muscle index (SMI) was used to define low muscle mass. Health care costs were obtained for all patients and the relationship between a low SMI and higher costs was explored using linear regression and cross-sectional analysis.Results
We included 156 patients (81.5% male) with a median age of 72 years undergoing elective surgery for infrarenal abdominal aortic aneurysm in this analysis. The median SMI for patients with low skeletal muscle mass was 53.21 cm2/kg and for patients without, 70.07 cm2/kg. Hospital duration of stay was 2 days longer in patients with low skeletal muscle mass as compared with patients with normal (14 days vs 11 days; P = .001), as was duration of intensive care stay (3 days vs 1 day; P = .01). The median overall hospital costs were €10,460 higher for patients with a low SMI as compared with patients with a normal physical constitution (€53,739 [interquartile range, €45,007-€62,471] vs €43,279 [interquartile range, €39,509-€47,049]; P = .001). After confounder adjustment, a low SMI was associated with a 14.68% cost increase in overall hospital costs, for a cost increase of €6521.Conclusions
Low skeletal muscle mass is independently associated with higher hospital as well as intensive care costs in patients undergoing elective aortic aneurysm repair. Strategies to reduce this risk factor are warranted for these patients. 相似文献2.
3.
Karl Lehner M.D. Maximilian Reiser Ulrich Gebhardt Andreas Heuck Jürgen Schaff 《Cardiovascular and interventional radiology》1987,10(2):71-74
In contrast to conventional film angiography, the perfusion pattern of hepatic arterial chemotherapy was consistently visualized
by DSA in 40 patients with implanted Infusaid pump or Port-A devices. Incomplete perfusion of a liver region by the cytotoxic
agent was recognized by DSA as accurately as by nuclide scintigraphy. Furthermore, DSA appeared to be more sensitive in determining
aberrantly perfused extrahepatic regions; this was especially true when there was a nonligated right hepatic artery. Specific
details of vascular lesions and associated complicating events also could be satisfactorily analyzed by DSA only. 相似文献
4.
B. C. L. Touwen M. S. Hempel L. C. Westra 《Developmental medicine and child neurology》1992,34(5):410-416
Various quantitative and qualitative aspects of crawling were analysed in small groups of carefully selected normal toddlers of 1 1/2, two, 2 1/2, three, 3 1/2 and four years of age in a cross-sectional design. Between two and three years of age, major changes occurred in all observed aspects, resulting in differentiated, adaptive and efficient crawling. It is proposed that these changes are based on so-called adaptive variability, an age-related developmental process which seems to be a prerequisite for the development of cognition. 相似文献
5.
Dr William Halsted firmly believed that the young physician achieved greater surgical maturity by observing the practice of surgery in countries in addition to his own. To promote this belief, Halsted initiated the concept of exchanging residents between training programs in different lands. This article presents a review of that historic first international exchange of residents. This glimpse into the past is accomplished by presenting previously unpublished letters of Halsted; Hermann Küttner, director of a surgical clinic in Germany; George Heuer, a resident from The Johns Hopkins Hospital, Baltimore; and Felix Landois, a resident from Küttner's clinic. 相似文献
6.
7.
8.
R J Hempel 《The Journal of the American Board of Family Practice / American Board of Family Practice》1992,5(5):483-487
BACKGROUND: Increasing seat belt use represents an ideal opportunity for preventive health care in family practice. Little evidence exists, however, that primary care physicians can increase safety belt use. METHODS: Three hundred twenty-six patients seen in a rural primary care center were randomized to either a control or intervention group. Before their health care examination, patients completed a short questionnaire concerning seat belt use and then viewed a 6-minute videotape explaining reasons to wear seat belts (intervention) or espousing general preventive health care guidelines with no mention of seat belts (control). In 6 months the questionnaire was again administered with no further intervention. RESULTS: Two hundred forty-three (74.5 percent) patients completed both baseline and 6-month questionnaires. Seat belt use increased significantly from baseline to 6 months for the intervention (22 to 37.3 percent, P = 0.00052) and control (20 to 33.6 percent, P = 0.00085) groups; however, the difference between the increase in the intervention (37.3 percent) and control (33.6 percent) groups at 6 months was insignificant (P = 0.641). The most common reasons for not using seat belts were forgetfulness (40.3 percent), fear of being trapped (26.7 percent), and lack of comfort (21.8 percent). CONCLUSIONS: Seat belt use increased in this study, although the intervention videotape was no better than the control videotape at increasing restraint use. This increase in use supports office-based intervention to improve seat belt use, but further research is needed to clarify the mechanism and extent of change possible. 相似文献
9.
10.