全文获取类型
收费全文 | 9111篇 |
免费 | 729篇 |
国内免费 | 60篇 |
专业分类
耳鼻咽喉 | 110篇 |
儿科学 | 241篇 |
妇产科学 | 251篇 |
基础医学 | 1216篇 |
口腔科学 | 207篇 |
临床医学 | 999篇 |
内科学 | 1740篇 |
皮肤病学 | 227篇 |
神经病学 | 745篇 |
特种医学 | 521篇 |
外科学 | 1308篇 |
综合类 | 264篇 |
一般理论 | 2篇 |
预防医学 | 622篇 |
眼科学 | 228篇 |
药学 | 712篇 |
2篇 | |
中国医学 | 49篇 |
肿瘤学 | 456篇 |
出版年
2023年 | 54篇 |
2022年 | 87篇 |
2021年 | 157篇 |
2020年 | 113篇 |
2019年 | 130篇 |
2018年 | 178篇 |
2017年 | 136篇 |
2016年 | 129篇 |
2015年 | 155篇 |
2014年 | 217篇 |
2013年 | 380篇 |
2012年 | 409篇 |
2011年 | 402篇 |
2010年 | 292篇 |
2009年 | 267篇 |
2008年 | 338篇 |
2007年 | 396篇 |
2006年 | 364篇 |
2005年 | 313篇 |
2004年 | 321篇 |
2003年 | 300篇 |
2002年 | 297篇 |
2001年 | 274篇 |
2000年 | 271篇 |
1999年 | 220篇 |
1998年 | 162篇 |
1997年 | 141篇 |
1996年 | 109篇 |
1995年 | 137篇 |
1994年 | 107篇 |
1993年 | 104篇 |
1992年 | 183篇 |
1991年 | 214篇 |
1990年 | 168篇 |
1989年 | 177篇 |
1988年 | 183篇 |
1987年 | 193篇 |
1986年 | 166篇 |
1985年 | 174篇 |
1984年 | 131篇 |
1983年 | 118篇 |
1982年 | 82篇 |
1981年 | 57篇 |
1980年 | 68篇 |
1979年 | 116篇 |
1978年 | 87篇 |
1977年 | 75篇 |
1976年 | 69篇 |
1975年 | 51篇 |
1973年 | 48篇 |
排序方式: 共有9900条查询结果,搜索用时 15 毫秒
2.
3.
Transplanting the Highly Sensitized Patient: The Emory Algorithm 总被引:4,自引:0,他引:4
R. A. Bray J. D. L. Nolen C. Larsen T. Pearson K. A. Newell K. Kokko A. Guasch P. Tso J. B. Mendel H. M. Gebel 《American journal of transplantation》2006,6(10):2307-2315
Renal transplant patients sensitized to HLA antigens comprise nearly one-third of the UNOS wait-list and receive 14% of deceased donor (DD) transplants, a rate half that of unsensitized patients. Between 1999 and 2003, we performed 492 adult renal transplants from DD; 120 patients (approximately 25%) had a panel reactive antibody (PRA) of >30%, with nearly half (n = 58) having a PRA of >80%. Our approach is based upon high-resolution solid-phase HLA antibody analysis to identify class I/II antibodies and a 'virtual crossmatch' to predict compatible donor/recipient combinations. Recipients are excluded from the United Network for Organ Sharing match run if donors possess unacceptable antigens. Thus, when sensitized patients appear on the match run, they have a high probability of a negative final crossmatch. Here, we describe our 5-year experience with this approach. Five-year graft survival ranged from 66% to 70% among unsensitized (n = 272), moderately sensitized (PRA < 30%, n = 100) and highly sensitized (>30% PRA; n = 120) patients, equal to the average national graft survival (65.7%). The application of this approach (the Emory Algorithm) provides a logical and systematic approach to improve the access of sensitized patients to DD organs and promote more equitable allocation to a highly disadvantaged group of patients awaiting renal transplantation. 相似文献
4.
5.
Dr. Arni Raghavendrarao Raghuram M.Ch. Subbiah Kumar MD Kathamuthu Balamurugan DA Arulmurugan DA Ramiah Krishnan M.Ch. Perichiappan Sivakami BS Eluvathingal Varghese John M.Ch. 《Indian Journal of Thoracic and Cardiovascular Surgery》2006,22(3):178-181
Background Beating heart surgery has now become the commonest technique of doing Coronary Artery Bypass Graft Surgery (CABG) in our country.
It is being used even in such high risk situations like diffuse coronary disease and Critical Left Main stem Stenosis (LMCS)
with good results. The aim of this study is to retrospectively review our results in Off-Pump Coronary Artery Bypass Surgery
(OPCAB) in patients with critical left main stem stenosis.
Methods This study is a retrospective analysis of the data of patients who underwent primary coronary artery bypass surgery. During
the period from April 2003 to September 2005 a total of 64 patients underwent OPCAB procedure for critical LMCS. During the
same period 10 patients underwent CABG on Cardio Pulmonary Bypass (CPB). The age range was 36–77yrs. The sex distribution
was M: F 53∶10. Ten patients were done as emergency. 2 of them were on Intra Aortic Balloon Pump (IABP) support preoperatively.
10 patients were high risk with a Euro score of ≥5.
Results Left Internal Mammary Artery (LIMA) was used in 78% of cases. Average grafts per patient was 2.96. The median ventilation
time was 5.91 hrs. New IABP insertion in postoperative period was required in 1 patient. One patient was reexplored for bleeding.
There was one perioperative myocardial infarction. 57% of patients did not need any blood transfusion. There was no conversion
to CPB. There was no operative mortality. Inotropes were used in ten cases.
Conclusions OPCAB is a safe method of revascularization in patients with critical LMCS. Preoperative IABP is useful in patients with cardiogenic
shock. However, there is a place for CPB in patients needing additional procedures like Mitral Valve repair (MV repair) or
Dor's procedure or when the vessels are very diffusely diseased. Those patients who are unstable despite IABP support may
be managed by Beating heart On Pump (BHOP) technique. 相似文献
6.
Clinical versus ultrasonographic evaluation of scrotal disorders 总被引:1,自引:0,他引:1
B Kromann-Andersen L B Hansen P N Larsen K Lawetz P Lynge D Lysen S P Nielsen K H Stockholm P Foged 《British journal of urology》1988,61(4):350-353
Clinical and ultrasonographic examinations of scrotal disorders were compared in 166 patients in order to determine their ability to distinguish between those diseases requiring surgery and those requiring clinical follow-up only. Ultrasound examinations were efficient in discriminating between normal and pathological findings. Extra-testicular lesions were readily differentiated from testicular ones. Although both clinical and ultrasonographic examinations had high sensitivity (90%) in detecting testicular cancer, the number of false positive findings was smaller after ultrasound examination. This gave a predictive value of a positive test of 53% after ultrasound examination but only 33% after clinical examination. Ultrasound examination may, therefore, reduce the number of surgical explorations in the scrotum and should be performed in patients with suspected testicular pathology based on history and palpatory findings. 相似文献
7.
P Rubin S Holm L Friberg P Videbech H S Andersen B B Bendsen N Str?ms? J K Larsen N A Lassen R Hemmingsen 《Archives of general psychiatry》1991,48(11):987-995
To measure prefrontal and subcortical activity during a cognitive task, we examined 19 newly diagnosed schizophrenics and patients with schizophreniform psychosis. Seven healthy volunteers served as controls. The patients were drug naive or had received neuroleptics for a few days only. Cerebral blood flow distribution was depicted by single photon emission computed tomography at rest and during activation with the Wisconsin Card Sorting Test. A significant relative activation deficit in the left inferior-prefrontal region was revealed during the Wisconsin Card Sorting Test in the patient group. Furthermore, the patients had impaired striatal suppression on the left side during the cognitive task. The test performance was significantly impaired in the patients. The inability to reduce striatal activity may be due to a lack of corticostriatal feedback during prefrontal activation. 相似文献
8.
9.
10.