全文获取类型
收费全文 | 18824篇 |
免费 | 1177篇 |
国内免费 | 200篇 |
专业分类
耳鼻咽喉 | 239篇 |
儿科学 | 639篇 |
妇产科学 | 455篇 |
基础医学 | 2520篇 |
口腔科学 | 216篇 |
临床医学 | 1486篇 |
内科学 | 3515篇 |
皮肤病学 | 332篇 |
神经病学 | 1363篇 |
特种医学 | 596篇 |
外国民族医学 | 1篇 |
外科学 | 2435篇 |
综合类 | 465篇 |
一般理论 | 23篇 |
预防医学 | 2953篇 |
眼科学 | 488篇 |
药学 | 1095篇 |
2篇 | |
中国医学 | 136篇 |
肿瘤学 | 1242篇 |
出版年
2024年 | 28篇 |
2023年 | 182篇 |
2022年 | 351篇 |
2021年 | 614篇 |
2020年 | 279篇 |
2019年 | 514篇 |
2018年 | 623篇 |
2017年 | 436篇 |
2016年 | 463篇 |
2015年 | 544篇 |
2014年 | 714篇 |
2013年 | 1013篇 |
2012年 | 1464篇 |
2011年 | 1515篇 |
2010年 | 904篇 |
2009年 | 719篇 |
2008年 | 1096篇 |
2007年 | 1184篇 |
2006年 | 1114篇 |
2005年 | 937篇 |
2004年 | 886篇 |
2003年 | 826篇 |
2002年 | 715篇 |
2001年 | 356篇 |
2000年 | 300篇 |
1999年 | 253篇 |
1998年 | 103篇 |
1997年 | 100篇 |
1996年 | 74篇 |
1995年 | 69篇 |
1994年 | 68篇 |
1993年 | 45篇 |
1992年 | 156篇 |
1991年 | 139篇 |
1990年 | 159篇 |
1989年 | 174篇 |
1988年 | 144篇 |
1987年 | 140篇 |
1986年 | 113篇 |
1985年 | 104篇 |
1984年 | 75篇 |
1983年 | 58篇 |
1982年 | 24篇 |
1981年 | 30篇 |
1980年 | 24篇 |
1979年 | 45篇 |
1975年 | 30篇 |
1974年 | 22篇 |
1973年 | 24篇 |
1972年 | 23篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
Stefan Ockert Hardy Schumacher Dittmar Böckler Katrin Malcherek Jochen Hansmann Jens Allenberg 《Langenbeck's archives of surgery / Deutsche Gesellschaft fur Chirurgie》2007,392(6):725-730
Background and aims Since the introduction of endovascular aortic aneurysm repair (EVAR) for aortic aneurysms, the number of juxtarenal aortic
aneurysms (JRA) has been growing steadily due to selection bias (neck morphology for EVAR). This case-match study compares
the perioperative outcome and midterm results of suprarenally clamped JRA with infrarenal aortic aneurysms (AAA).
Methods From 1997 to 2004, patients who received open surgery with suprarenal clamping for JRA were included in the study and compared
to matched patients with infrarenal clamping (AAA). Measurements analyzed were the in-hospital mortality and morbidity. Midterm
results were obtained through clinical investigation and magnetic resonance angiography imaging.
Results Thirty-five patients (mean age, 68.4 years; 30 male and 5 female) received suprarenal cross-clamping for JRA. The overall
in-hospital mortality for JRA and for the controls (AAA) with elective aortic repair was 4.5% (6.1% JRA; 3% AAA, p = 0.058). The morbidity of JRA was elevated according to the rate of pulmonary complications (p = 0.021) and the need for re-operation (p = 0.019). The mean follow-up time was 2.3 years (range, 8–96 months). At follow-up, 28 patients (80%) from the JRA group
and 29 patients from the AAA group (82.9%) were alive.
Conclusion Open aortic surgery for JRA with the need for suprarenal cross-clamping shows a slightly elevated in-hospital mortality rate
without statistical significance and equal midterm mortality results in comparison with infrarenally clamped aortic aneurysms. 相似文献
22.
23.
24.
A survey was performed on the radiotherapy practice of malignant pleural mesothelioma in The Netherlands and Belgium in 2002. Thirty-eight out of 47 centres (81%) responded. Prophylactic radiotherapy to intervention sites is given by 32/38 (84%) centres, with all centres offering palliative radiation. For both prophylactic and palliative indications, all centres use hypo-fractionated schedules. The present study shows that in the radiotherapy community in The Netherlands and in Belgium, a de facto consensus exists that both prophylactic and symptomatic radiotherapy to intervention sites of malignant pleural mesothelioma are effective and that hypo-fractionated schedules should be used. 相似文献
25.
Maninder S Kalkat Ishtiaq Rahman Kostas Kotidis Ben Davies Robert S Bonser 《European journal of cardio-thoracic surgery》2007,32(2):250-254
BACKGROUND: In Marfan's syndrome, there is a paucity of data regarding intervention criteria for surgery of the dissected thoraco-abdominal aorta. METHODS: A retrospective analysis of 22 Marfan's patients with distal aortic dissection managed between September 1999 and April 2006 was performed. Serial diameters and linear expansion rates were calculated from imaging studies and the outcome of intervention was analysed. RESULTS: There were 14/22 male patients (median age 38 years), and 18 had prior aortic surgery. Surgery was recommended in 20 patients and undertaken in 19 (1 died prior to operation). Of the operated patients, 2 presented with rupture, 2 with airway obstruction, 1 with intermittent paraplegia and 14 underwent planned surgery for increased expansion rate or pain. All patients had residual type A or chronic type B dissection. The median aortic dimension at surgery was 6.7 cm (interquartile range (IQR) 5.5-8.2). The preoperative mean expansion rate increased from 0.5 cm/year to 1.7 cm/year (p<0.001), prior to operation. Fifteen patients underwent Crawford Extent II, two underwent Extent I and two underwent Extent III repair. Profound hypothermia and CSF drainage was used in 16 and 18 patients, respectively. There was no early mortality, paraplegia or renal failure. At a median postoperative follow-up of 56 months (range 6-86), the survival of the operated cohort was 90%. CONCLUSIONS: Thoraco-abdominal aortic aneurysm repair in Marfan's syndrome can be performed with good outcomes. Intervention should be based on size or accelerated expansion. Any role of endovascular management needs careful consideration. 相似文献
26.
27.
28.
Lucy Wong-Hernandez Daniel W. Wong G. Ben Selby 《中国康复理论与实践》2006,12(9):758-761
1Introduction Substanceabusecontinuestobeamongthemostsevereso cialandcostlyhealthproblemsdevastatingindividualsandtheir familiesintheUnitedStates.Initssimplestdefinition,sub stanceabuseisthecontinueduseofalcoholorotherdrugsde spiteknowledgeofhavingapersistentsocial,vocational,psy chologicalorphysicalproblemthatiscausedorexacerbatedby theuseofalcoholorotherdrugs(DSMIV TR,1994).All drugsofabuse,includingalcohol,aretoxicandcannegatively impacteverysysteminthehumanorganism.Protractedsub stance… 相似文献
29.
30.
M Ben Farhat H Boussadia I Gandjbakhch H Mzali A Chouaieb M Ayari K Ben Salah 《The Journal of thoracic and cardiovascular surgery》1990,99(4):639-644
Controversy persists regarding whether the efficacy of closed instrumental mitral commissurotomy compares well enough with that of open commissurotomy to warrant its continued use. The purpose of this study was to compare the results of operation as determined by catheterization studies in 63 patients with pure, severe, and noncalcified mitral stenosis. The patients were randomly assigned to one of two groups: thirty-two patients were operated on by the closed technique (group I) and 31 by the open technique (group II). All patients underwent left-sided and right-sided catheterization before and 4 months after operation. Preoperatively the two groups were statistically similar with regard to major clinical data and hemodynamic findings. There were no deaths at operation or systemic embolism in the two groups. The prevalence of surgically induced mitral regurgitation was similar in the two groups (12.4% versus 12.9%). Pulmonary arterial pressure and arteriolar and total pulmonary vascular resistance decreased significantly in the two groups. Pulmonary capillary wedge pressure decreased from 23.3 +/- 8.5 to 15.8 +/- 7 mm Hg in group I (p less than 0.001) and from 23.7 +/- 6 to 14 +/- 5.8 mm Hg in group II (p less than 0.001). Cardiac index increased from 2.86 +/- 0.84 to 3.14 +/- 0.78 L/min/m2 in group I, but this increase did not reach statistical significance. In group II cardiac index increased from 2.89 +/- 0.6 to 3.6 +/- 0.6 L/min/m2 (p less than 0.005). The mean and end-diastolic transmitral pressure gradients decreased significantly in the two groups, but the decrease was statistically greater in the open mitral commissurotomy group (p less than 0.001). Mitral valve area increased from 0.82 +/- 0.18 to 1.4 +/- 0.40 cm2 in group I (p less than 0.01) and from 0.84 +/- 0.15 to 2.14 +/- 0.53 cm2 in group II (p less than 0.001). The mean increase in mitral valve area was 0.61 cm2 in group I and 1.34 cm2 in group II (p less than 0.001). At exercise, in patients with resting pulmonary capillary wedge pressures of 18 mm Hg or less, cardiac index increased by 36% in group I (23 patients) and 48% in group II (24 patients), because of a smaller mitral valve area in group I (1.61 +/- 0.39 cm2) than in group II (2.45 +/- 0.65 cm2). Thus open commissurotomy improved hemodynamic values to a greater extent than closed commissurotomy at both rest and exercise.(ABSTRACT TRUNCATED AT 400 WORDS) 相似文献