全文获取类型
收费全文 | 1033篇 |
免费 | 72篇 |
国内免费 | 35篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 27篇 |
妇产科学 | 8篇 |
基础医学 | 99篇 |
口腔科学 | 22篇 |
临床医学 | 94篇 |
内科学 | 234篇 |
皮肤病学 | 13篇 |
神经病学 | 34篇 |
特种医学 | 128篇 |
外科学 | 124篇 |
综合类 | 89篇 |
预防医学 | 81篇 |
眼科学 | 30篇 |
药学 | 111篇 |
肿瘤学 | 43篇 |
出版年
2022年 | 7篇 |
2021年 | 18篇 |
2020年 | 7篇 |
2019年 | 16篇 |
2018年 | 27篇 |
2017年 | 22篇 |
2016年 | 24篇 |
2015年 | 20篇 |
2014年 | 28篇 |
2013年 | 52篇 |
2012年 | 53篇 |
2011年 | 59篇 |
2010年 | 26篇 |
2009年 | 41篇 |
2008年 | 47篇 |
2007年 | 67篇 |
2006年 | 54篇 |
2005年 | 45篇 |
2004年 | 37篇 |
2003年 | 27篇 |
2002年 | 25篇 |
2001年 | 20篇 |
2000年 | 19篇 |
1999年 | 25篇 |
1998年 | 39篇 |
1997年 | 25篇 |
1996年 | 25篇 |
1995年 | 21篇 |
1994年 | 19篇 |
1993年 | 17篇 |
1992年 | 9篇 |
1991年 | 20篇 |
1990年 | 8篇 |
1989年 | 20篇 |
1988年 | 21篇 |
1987年 | 16篇 |
1986年 | 13篇 |
1985年 | 8篇 |
1984年 | 10篇 |
1983年 | 14篇 |
1982年 | 9篇 |
1981年 | 12篇 |
1980年 | 11篇 |
1979年 | 4篇 |
1978年 | 9篇 |
1977年 | 5篇 |
1975年 | 13篇 |
1974年 | 9篇 |
1973年 | 4篇 |
1972年 | 4篇 |
排序方式: 共有1140条查询结果,搜索用时 46 毫秒
81.
In five patients, aged 4 days to 20 months, the left pulmonary artery was inadvertently ligated at the time of attempted closure of the patent ductus arteriosus. The complication was recognized in these patients between 1 day and 5 years later from findings of chest radiography, two-dimensional echocardiography with spectral analysis of Doppler shifted echoes, and angiography. In three patients, the presence of asymmetric pulmonary blood flow on chest radiographs obtained after surgery initially suggested the diagnosis. In the other two patients with bronchopulmonary dysplasia, the diagnosis was made by means of two-dimensional echocardiography and Doppler spectra in one and angiography in the other. On angiograms, the left pulmonary artery distal to the ligation was visualized by delayed opacification from aortic collaterals in three patients and by means of pulmonary venous wedge injection in one. Radiographic and echocardiographic examination with Doppler spectra may permit prompt diagnosis and early correction of this complication. 相似文献
82.
83.
84.
Access to kidney transplantation in European adults aged 75–84 years and related outcomes: an analysis of the European Renal Association–European Dialysis and Transplant Association Registry
下载免费PDF全文
![点击此处可从《Transplant international》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Maria Pippias Vianda S. Stel Anneke Kramer Jose M. Abad Diez Nuria Aresté‐Fosalba Carole Ayav Jadranka Buturovic Fergus J. Caskey Frederic Collart Cécile Couchoud Johan De Meester James G. Heaf Ilkka Helanterä Marc H. Hemmelder Myrto Kostopoulou Marlies Noordzij Julio Pascual Runolfur Palsson Anna Varberg Reisæter Jamie P. Traynor Ziad Massy Kitty J. Jager 《Transplant international》2018,31(5):540-553
To what extent access to, and allocation of kidney transplants and survival outcomes in patients aged ≥75 years have changed over time in Europe is unclear. We included patients aged ≥75–84 years (termed older adults) receiving renal replacement therapy in thirteen European countries between 2005 and 2014. Country differences and time trends in access to, and allocation of kidney transplants were examined. Survival outcomes were determined by Cox regression analyses. Between 2005 and 2014, 1392 older adult patients received 1406 transplants. Access to kidney transplantation varied from ~0% (Slovenia, Greece and Denmark) to ~4% (Norway and various Spanish regions) of all older adult dialysis patients, and overall increased from 0.3% (2005) to 0.9% (2014). Allocation of kidney transplants to older adults overall increased from 0.8% (2005) to 3.2% (2014). Seven‐year unadjusted patient and graft survival probabilities were 49.1% (95% confidence interval, 95% CI: 43.6; 54.4) and 41.7% (95% CI: 36.5; 46.8), respectively, with a temporal trend towards improved survival outcomes. In conclusion, in the European dialysis population aged ≥75–84 years access to kidney transplantation is low, and allocation of kidney transplants remains a rare event. Though both are increasing with time and vary considerably between countries. The trend towards improved survival outcomes is encouraging. This information can aid informed decision‐making regarding treatment options. 相似文献
85.
86.
87.
Hirad Yarmohammadi Audrey Uy-Evanado Kyndaron Reinier Carmen Rusinaru Harpriya Chugh Jonathan Jui Sumeet S. Chugh 《Mayo Clinic proceedings. Mayo Clinic》2017,92(10):1479-1485
Objective
To evaluate the potential role of low serum Ca levels in the occurrence of sudden cardiac arrest (SCA) in the community.Patients and Methods
We compared 267 SCA cases [177 (66%) men] and 445 controls [314 (71%) men] from a large population-based study (catchment population ~1 million individuals) in the US Northwest from February 1, 2002, through December 31, 2015. Patients were included if their age was 18 years or older with available creatinine clearance (CrCl) and serum electrolyte levels for analyses to enable adjustment for renal function. For cases, creatinine clearance and electrolyte levels were required to be measured within 90 days of the SCA event.Results
Cases of SCA had higher proportions of blacks [31 (12%) vs 14 (3%); P<.001], diabetes mellitus [122 (46%) vs 126 (28%); P<.001], and chronic kidney disease [102 (38%) vs 73 (16%); P<.001] than did controls. In multivariable logistic regression analysis, a 1-unit decrease in Ca levels was associated with a 1.6-fold increase in odds of SCA (odds ratio, 1.63; 95% CI, 1.06-2.51). Blood Ca levels lower than 8.95 mg/dL (to convert to mmol/L, multiply by 0.025) were associated with a 2.3-fold increase in odds of SCA as compared with levels higher than 9.55 mg/dL (odds ratio, 2.33; 95% CI, 1.17-4.61). Cases of SCA had significantly prolonged corrected QT intervals on the 12-lead electrocardiogram than did controls (465±37 ms vs 425±33 ms; P<.001).Conclusion
Lower serum Ca levels were independently associated with an increased risk of SCA in the community. 相似文献88.
89.
Reinier B. Beks Yassine Ochen Herman Frima Diederik P.J. Smeeing Olivier van der Meijden Tim K. Timmers Detlef van der Velde Mark van Heijl Luke P.H. Leenen Rolf H.H. Groenwold R. Marijn Houwert 《Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.]》2018,27(8):1526-1534
90.
Deng MC Smits JM De Meester J Hummel M Schoendube F Scheld HH 《Current opinion in cardiology》2001,16(2):97-104
The COCPIT study, performed in a complete national cohort of adult patients consecutively listed for cardiac transplantation in Germany in 1997, found a beneficial effect only in the group that was at high risk of dying from heart failure without transplantation. If these results can be reproduced in other countries, the discussion on the respective roles of pharmacological and organ-saving surgical therapies for advanced heart failure, medical urgency and waiting time as heart transplantation allocation criteria, and the feasibility of a randomized clinical trial testing the survival benefit of transplantation must be reopened. 相似文献