全文获取类型
收费全文 | 881993篇 |
免费 | 73641篇 |
国内免费 | 1857篇 |
专业分类
耳鼻咽喉 | 13002篇 |
儿科学 | 25232篇 |
妇产科学 | 25580篇 |
基础医学 | 126999篇 |
口腔科学 | 25979篇 |
临床医学 | 77838篇 |
内科学 | 168878篇 |
皮肤病学 | 17273篇 |
神经病学 | 72141篇 |
特种医学 | 35839篇 |
外国民族医学 | 171篇 |
外科学 | 138791篇 |
综合类 | 25103篇 |
现状与发展 | 2篇 |
一般理论 | 278篇 |
预防医学 | 69121篇 |
眼科学 | 20887篇 |
药学 | 66521篇 |
1篇 | |
中国医学 | 1619篇 |
肿瘤学 | 46236篇 |
出版年
2018年 | 7700篇 |
2015年 | 8048篇 |
2014年 | 11558篇 |
2013年 | 17465篇 |
2012年 | 23689篇 |
2011年 | 24839篇 |
2010年 | 14455篇 |
2009年 | 13540篇 |
2008年 | 23459篇 |
2007年 | 25644篇 |
2006年 | 25432篇 |
2005年 | 25106篇 |
2004年 | 24570篇 |
2003年 | 23789篇 |
2002年 | 22760篇 |
2001年 | 36383篇 |
2000年 | 37031篇 |
1999年 | 31395篇 |
1998年 | 9468篇 |
1997年 | 8740篇 |
1996年 | 8644篇 |
1995年 | 8217篇 |
1994年 | 7907篇 |
1992年 | 27074篇 |
1991年 | 26466篇 |
1990年 | 25997篇 |
1989年 | 25040篇 |
1988年 | 23544篇 |
1987年 | 23232篇 |
1986年 | 22032篇 |
1985年 | 21444篇 |
1984年 | 16687篇 |
1983年 | 14231篇 |
1982年 | 9102篇 |
1981年 | 8392篇 |
1980年 | 7873篇 |
1979年 | 17019篇 |
1978年 | 12353篇 |
1977年 | 10354篇 |
1976年 | 9520篇 |
1975年 | 10316篇 |
1974年 | 12857篇 |
1973年 | 12355篇 |
1972年 | 11723篇 |
1971年 | 10864篇 |
1970年 | 10346篇 |
1969年 | 10066篇 |
1968年 | 9007篇 |
1967年 | 8326篇 |
1966年 | 7764篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
973.
974.
975.
976.
977.
978.
Christopher D Gardner James L Zehnder Alison J Rigby Joel R Nicholus John W Farquhar 《Blood coagulation & fibrinolysis》2007,18(8):787-793
Several case reports have implicated Ginkgo biloba in clinically adverse bleeding disorders. Ginkgo biloba has been reported to increase pain-free walking distance among patients with peripheral artery disease (PAD). Standard PAD therapy includes 325 mg/day aspirin. The objective of this study was to examine potential adverse effects of concomitant aspirin and Ginkgo biloba on platelet function. Ginkgo biloba (EGb 761, 300 mg/day) was compared with placebo for effects on measures of platelet aggregation among adults consuming 325 mg/day aspirin in a randomized, double-blind, placebo-controlled, parallel design trial of 4-week duration. Participants were adults, age 69 +/- 10 years, with PAD or risk factors for cardiovascular disease. Outcome measures included platelet function analysis (PFA-100 analyzer) using ADP as an agonist (n = 26 placebo; n = 29 ginkgo), and platelet aggregation using ADP, epinephrine, collagen and ristocetin as agonists (n = 21 placebo; n = 23 ginkgo). Participants kept daily logs of bleeding or bruising episodes. There were no clinically or statistically significant differences between treatment groups for any agonists, for either PFA-100 analysis or platelet aggregation. Reports of bleeding or bruising were infrequent and similar for both study groups. In conclusion, in older adults with PAD or cardiovascular disease risk, a relatively high dose of Ginkgo biloba combined with 325 mg/day daily aspirin did not have a clinically or statistically detectable impact on indices of coagulation examined over 4 weeks, compared with the effect of aspirin alone. No adverse bleeding events were observed, although the trial was limited to a small sample size. 相似文献
979.
Popliteal artery aneurysms representing 80% of peripheral artery aneurysms rarely rupture (a reported incidence of 0.1–2.8
%) and second commonest in frequency after aorto-iliac aneurysms. They usually present with pain, swelling, occlusion or distal
embolisation and can cause diagnostic difficulties. We report a 78 year old man who was previously admitted to hospital with
a pulmonary embolus secondary to deep venous thrombosis. He was heparinized then warfarinised and was readmitted with a ruptured
popliteal aneurysm leading to a large pseudo aneurysm formation. The pulmonary embolus had been due to popliteal vein thrombosis
and propagation of the clot. A thorough review of literature identified only one previously reported case of ruptured popliteal
artery aneurysm and subsequent large pseudo aneurysm formation. We feel it is important to exclude a popliteal aneurysm in
a patient with DVT. This may be more common than the published literature suggests. 相似文献
980.
Marcelo W. Hinojosa Zuri A. Murrell Viken R. Konyalian Steven Mills Ninh T. Nguyen Michael J. Stamos 《Journal of gastrointestinal surgery》2007,11(11):1423-1430
Few studies have examined outcomes of laparoscopic and open sigmoid colectomy performed at US academic centers. Using ICD-9
diagnosis and procedural codes, data was obtained from the University HealthSystem Consortium (UHC) Clinical Database of 10,603
patients who underwent laparoscopic or open sigmoid colectomy for benign and malignant disease between 2003–2006. A total
of 1,092 patients (10.3%) underwent laparoscopic sigmoid colectomy. Laparoscopic sigmoid colectomy was associated with a significantly
shorter length of stay (5.4 vs 7.4 days), lower overall complication rate (19.7 vs 26.0%), lower 30-day readmission rate (3.4
vs 4.6), and a lower hospital cost ($13,814 vs $15,626). When a subset analysis of malignant and benign groups was performed,
a significantly shorter length of stay in both the malignant laparoscopic group (6.4 ± 6.4 vs 7.8 ± 6.6 days) and in the benign
laparoscopic groups (5.1 ± 3.5 vs 7.2 ± 7.6) exists. A lower wound complication rate (2.1 vs 5.5%, malignant and 4.0 vs 6.1,
benign) is also evident. Laparoscopic sigmoid colectomy was associated with a shorter length of stay, less complications,
and a lower 30-day readmission rate. The shorter length of stay and wound infection rate maintain significance when comparing
laparoscopic vs open sigmoid resections for malignant and benign disease.
Presented at the 48th annual meeting of the Society for Surgery of the Alimentary Tract at Digestive Disease Weak, Washington,
DC, May 21st 2007.
The information contained in this article was based on the Clinical Data Base provided by the University HealthSystem Consortium. 相似文献