全文获取类型
收费全文 | 4426篇 |
免费 | 283篇 |
国内免费 | 46篇 |
专业分类
耳鼻咽喉 | 40篇 |
儿科学 | 168篇 |
妇产科学 | 124篇 |
基础医学 | 373篇 |
口腔科学 | 57篇 |
临床医学 | 447篇 |
内科学 | 902篇 |
皮肤病学 | 96篇 |
神经病学 | 399篇 |
特种医学 | 432篇 |
外国民族医学 | 1篇 |
外科学 | 619篇 |
综合类 | 209篇 |
预防医学 | 282篇 |
眼科学 | 38篇 |
药学 | 271篇 |
2篇 | |
中国医学 | 35篇 |
肿瘤学 | 260篇 |
出版年
2022年 | 43篇 |
2021年 | 64篇 |
2020年 | 51篇 |
2019年 | 50篇 |
2018年 | 71篇 |
2017年 | 73篇 |
2016年 | 73篇 |
2015年 | 82篇 |
2014年 | 111篇 |
2013年 | 164篇 |
2012年 | 225篇 |
2011年 | 231篇 |
2010年 | 188篇 |
2009年 | 191篇 |
2008年 | 205篇 |
2007年 | 198篇 |
2006年 | 217篇 |
2005年 | 171篇 |
2004年 | 149篇 |
2003年 | 136篇 |
2002年 | 142篇 |
2001年 | 136篇 |
2000年 | 120篇 |
1999年 | 96篇 |
1998年 | 103篇 |
1997年 | 94篇 |
1996年 | 94篇 |
1995年 | 81篇 |
1994年 | 53篇 |
1993年 | 57篇 |
1992年 | 40篇 |
1991年 | 49篇 |
1990年 | 49篇 |
1989年 | 56篇 |
1988年 | 72篇 |
1987年 | 71篇 |
1986年 | 69篇 |
1985年 | 70篇 |
1984年 | 36篇 |
1983年 | 43篇 |
1982年 | 21篇 |
1980年 | 23篇 |
1978年 | 22篇 |
1977年 | 20篇 |
1976年 | 28篇 |
1959年 | 22篇 |
1958年 | 29篇 |
1956年 | 30篇 |
1955年 | 42篇 |
1954年 | 36篇 |
排序方式: 共有4755条查询结果,搜索用时 15 毫秒
2.
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
3.
4.
5.
6.
7.
8.
氟西汀与阿米替林治疗105例抑郁障碍病人的双盲对照试验 总被引:6,自引:4,他引:2
目的:评价国产氟西汀的抗抑郁作用及安全性。方法:采用随机、双盲对照、多中心研究,分为国产氟西汀组57例(男性22例,女性35例;年龄40±s13a),口服氟西汀20mg,qd,阿米替林57例(男性27例,女性30例;年龄40±14a),口服阿米替林75mg,bid,疗程6wk。结果:氟西汀治疗抑郁障碍的疗效与阿米替林相当,总有效率分别为85%及92%(P>0.05);氟西汀组的主要副作用有口干、便秘、恶心、心动过速等,但较之阿米替林程度轻且发生率低。结论:氟西汀的抗抑郁作用与阿米替林相当,副作用少,服用方便。 相似文献
9.
Carlos Sala M.D. Eduardo García-Granero M.D. Ph.D. María J. Molina M.D. Jose V. García M.D. Salvador Lledo M.D. Ph.D. 《Diseases of the colon and rectum》1997,40(8):958-961
PURPOSE: Epidural anesthesia is believed to benefit colorectal anastomotic blood flow because of the sympathetic blockade it produces. Our purpose is to measure with tonometry the effect of epidural anesthesia on colorectal anastomotic oxygenation. PATIENTS AND METHODS: Fifteen patients operated on for rectal cancer (radical anterior resection) were monitored postoperatively using tonometers placed in the stomach (celiac trunk), transverse colon (superior mesenteric artery), and the anastomotic area during the operation. An epidural catheter was placed at L1-2, and on the first postoperative day, 8 ml of bupivacaine (0.25 percent) was administered. The anesthetic effect extended up to T-4. Intramucosal pH (pHi) at the three locations was measured before, during, and after the epidural blockade. RESULTS: Gastric and transverse colon pHi increased during the epidural blockade from 7.35±0.01 to 7.41±0.01 and from 7.34±0.02 to 7.40±0.02, respectively. The anastomotic pHi decreased from 7.3±0.02 to 7.24±0.03 under the epidural and increased up to 7.34±0.02 after withdrawal of the effect on the following day. All pHi variations were statistically significant (P<0.05, paired Student'st-test and Wilcoxon's test), because it was the comparison between gastric and transverse colon pHi with the anastomotic pHi during the epidural (P<0.05, one-way analysis of variance and Kruskal-Wallis tests). None of the patients developed anastomotic or other complications. CONCLUSIONS: Epidural anesthesia with bupivacaine causes a significant decrease in the oxygenation-perfusion state of colorectal anastomosis in comparison with the increase in other areas of the digestive tract. Further studies need to be done to see if other epidural anesthetic-analgesic protocols also worsen colorectal anastomotic blood flow.Supported in part by a grant from the Spanish Society of Digestive Diseases, Madrid, Spain. All tonometric catheters and drugs were donated by the Clinic University Hospital of Valencia, Spain.Read at the meeting of The American Society of Colon and Rectal Surgeons, Seattle, Washington, June 9 to 14, 1996. 相似文献
10.