全文获取类型
收费全文 | 10802篇 |
免费 | 744篇 |
国内免费 | 72篇 |
专业分类
耳鼻咽喉 | 69篇 |
儿科学 | 234篇 |
妇产科学 | 232篇 |
基础医学 | 1319篇 |
口腔科学 | 266篇 |
临床医学 | 1023篇 |
内科学 | 2582篇 |
皮肤病学 | 138篇 |
神经病学 | 1091篇 |
特种医学 | 594篇 |
外科学 | 1239篇 |
综合类 | 305篇 |
一般理论 | 9篇 |
预防医学 | 926篇 |
眼科学 | 315篇 |
药学 | 737篇 |
3篇 | |
中国医学 | 40篇 |
肿瘤学 | 496篇 |
出版年
2023年 | 68篇 |
2022年 | 113篇 |
2021年 | 209篇 |
2020年 | 140篇 |
2019年 | 165篇 |
2018年 | 196篇 |
2017年 | 130篇 |
2016年 | 164篇 |
2015年 | 177篇 |
2014年 | 243篇 |
2013年 | 434篇 |
2012年 | 518篇 |
2011年 | 585篇 |
2010年 | 386篇 |
2009年 | 406篇 |
2008年 | 522篇 |
2007年 | 581篇 |
2006年 | 559篇 |
2005年 | 585篇 |
2004年 | 486篇 |
2003年 | 453篇 |
2002年 | 456篇 |
2001年 | 228篇 |
2000年 | 215篇 |
1999年 | 206篇 |
1998年 | 207篇 |
1997年 | 163篇 |
1996年 | 148篇 |
1995年 | 136篇 |
1994年 | 97篇 |
1993年 | 112篇 |
1992年 | 133篇 |
1991年 | 129篇 |
1990年 | 107篇 |
1989年 | 111篇 |
1988年 | 118篇 |
1987年 | 104篇 |
1986年 | 97篇 |
1985年 | 101篇 |
1984年 | 69篇 |
1983年 | 88篇 |
1982年 | 78篇 |
1981年 | 77篇 |
1980年 | 69篇 |
1979年 | 57篇 |
1978年 | 71篇 |
1977年 | 68篇 |
1976年 | 53篇 |
1975年 | 50篇 |
1973年 | 48篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
2.
3.
4.
5.
Paul C. Willems Leon Elmans Patricia G. Anderson Wilco C. H. Jacobs Dick B. van der Schaaf Marinus de Kleuver 《European spine journal》2006,15(10):1487-1494
The results of lumbar fusion in chronic low back pain (LBP) patients vary considerably, and there is a need for proper patient selection. Lumbosacral orthoses have been widely used to predict outcome, however, with little scientific support. The aim of the present study was to determine the value of a pantaloon cast test in selecting chronic LBP patients for lumbar fusion or conservative management. First, a systematic review of the literature was carried out in which two independent reviewers identified studies in Medline, Cochrane and Current Contents databases. Three papers met the selection criteria. In the only study with a control group, a significantly better outcome after fusion compared to conservative treatment was found in patients who reported significant pain relief while in a cast (i.e. a positive cast test). The results of lumbar fusion, however, were not significantly different for patients with a positive and those with a negative cast test. In addition to the review, a clinical cohort study of 257 LBP patients, who had been allocated to either lumbar fusion or conservative management by a temporary external transpedicular fixation trial, was performed. Prior to allocation, all had undergone a pantaloon cast test. Patients with no history of prior spine surgery and with a positive pantaloon cast test had a better outcome after lumbar fusion than those treated conservatively (P = 0.002, χ
2 test). In patients with previous spine operations the outcomes were poor and the test was of no value. From the literature and the present patient cohort, it was concluded that only in chronic LBP patients without prior spine surgery, a pantaloon cast test with substantial pain relief suggests a favorable outcome of lumbar fusion compared to conservative management. The test has no value in patients who have had previous spine surgery. 相似文献
6.
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
7.
Protein-calorie malnutrition (PCM) impairs immune responsiveness predisposing to Candida albicans sepsis, but mechanisms are unclear. This study examined the effect of PCM on enteric-derived C. albicans intestinal translocation and the ability of in vivo interferon-gamma (IFN-gamma) to upregulate macrophage (MO) candidacidal mechanisms in PCM mice. Control (24% casein) and low protein (2.5%) diets were given for 4 weeks. Mice (n = 160) were fed C. albicans in their drinking water for 3 days and C. albicans translocation (mean colony-forming units (CFU)/g tissue +/- SEM) to the GI tract, liver, spleen, and kidney was assessed at 1 and 5 days following endotoxin challenge of 1, 5, and 10 mg/kg body wt. In a separate study (n = 100 mice), IFN-gamma (1000-10,000 U/day ip) vs saline was given for 3 days prior to harvesting peritoneal macrophages for assay of superoxide anion (O2-), percentage macrophage phagocytosis of C. albicans, and percentage killing of C. albicans. On Day 1, fungal translocation to the intestinal wall and systemic organs in the PCM group was significantly higher. On Day 5, mean CFU were significantly higher in the PCM group, indicating impaired organ clearance. Mean O2-, phagocytosis, and killing were significantly impaired in the PCM group (P less than 0.05), but IFN-gamma improved all functions. PCM significantly depressed host responses to C. albicans. IFN-gamma treatment enhanced candidacidal mechanisms, suggesting a therapeutic role in the malnourished host predisposed to C. albicans sepsis. 相似文献
8.
9.
10.
Leon A Assael 《Journal of oral and maxillofacial surgery》2005,63(10):1407-1408