首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   718篇
  免费   55篇
  国内免费   22篇
耳鼻咽喉   1篇
儿科学   49篇
妇产科学   6篇
基础医学   73篇
口腔科学   42篇
临床医学   59篇
内科学   135篇
皮肤病学   34篇
神经病学   15篇
特种医学   219篇
外科学   27篇
综合类   34篇
预防医学   35篇
眼科学   4篇
药学   21篇
肿瘤学   41篇
  2019年   3篇
  2018年   6篇
  2017年   5篇
  2016年   9篇
  2015年   10篇
  2014年   14篇
  2013年   10篇
  2012年   5篇
  2011年   8篇
  2010年   21篇
  2009年   20篇
  2008年   19篇
  2007年   12篇
  2006年   13篇
  2005年   7篇
  2004年   10篇
  2003年   10篇
  2002年   5篇
  2001年   11篇
  2000年   9篇
  1999年   13篇
  1998年   40篇
  1997年   44篇
  1996年   40篇
  1995年   35篇
  1994年   23篇
  1993年   32篇
  1992年   19篇
  1991年   17篇
  1990年   14篇
  1989年   23篇
  1988年   28篇
  1987年   44篇
  1986年   25篇
  1985年   16篇
  1984年   8篇
  1983年   12篇
  1982年   14篇
  1981年   21篇
  1980年   17篇
  1979年   8篇
  1978年   6篇
  1977年   9篇
  1976年   21篇
  1975年   10篇
  1934年   4篇
  1933年   3篇
  1930年   3篇
  1927年   4篇
  1926年   4篇
排序方式: 共有795条查询结果,搜索用时 0 毫秒
701.
Liver biopsies were performed in 5 boys aged between 2 and 9 years with severe classical haemophilia who had persistently abnormal liver function tests. Abnormal histology was present in all; 4 had chronic persistent hepatitis and the fifth chronic aggressive hepatitis with early cirrhosis. Evidence of previous hepatitis B infection was present in one patient, 3 had antibodies to hepatitis, A, and 2 had subnormal levels of alpha-1-antitrypsin. Haemobilia occurred as a late complication of biopsy in one. The significance of these findings in young boys is discussed, as is the role of exposure to factor VIII containing blood products. It is concluded that cryoprecipitate should be used in preference to large pool factor VIII concentrates in children with haemophilia.  相似文献   
702.
703.
704.
BACKGROUND: Cisapride is a prokinetic agent that facilitates gastrointestinal motility and is widely used for the treatment of gastroesophageal reflux disease (GERD) in adults and children. However, reports of ventricular proarrhythmia have been noted in patients taking cisapride, particularly in conjunction with other drugs that may inhibit hepatic metabolism of cisapride via the cytochrome P450 3A4 system. OBJECTIVE: We designed a prospective, blinded study to evaluate the effect of cisapride on ventricular repolarization in children with GERD. METHODS: We analyzed the electrocardiograms (ECGs) from 35 children (age 0.4 to 18 years, mean 5.2 years) including measurement of the resting QT interval (QTc), JT interval (JTc), as well as QT and JT interlead dispersion markers. Data from these patients were compared with ECGs from a control group of 1000 normal children. RESULTS: Eleven (31%) of 35 patients receiving cisapride had a prolonged QTc (> or = 450 ms). The JTc was prolonged > or = 360 ms in 16 of 35 patients (46%). The mean QTc in the cisapride group was 428 +/- 35 ms and mean JTc was 336 +/- 35 ms. An increased QT or JT dispersion (> 70 ms) was seen in only 3 of 35 children. Of the 11 children with QTc prolongation, 2 had documented torsades de pointes ventricular tachycardia. Both patients were taking cisapride concomitantly with a macrolide antibiotic. All other patients were treated with either cisapride alone or in conjunction with other GERD agents, such as ranitidine or omeprazole. CONCLUSIONS: Cisapride may cause prolongation of ventricular repolarization in children. There does not appear to be increased heterogeneity of repolarization or delayed depolarization in this small sample. The proarrhythmia may be exacerbated by medications that inhibit cytochrome P450 3A4 hepatic metabolism, overdosage, or mechanisms that result in decreased serum clearance. ECG intervals should be monitored in children maintained on cisapride, particularly when used in combination with other known QT-prolonging medications.  相似文献   
705.
706.
707.
Just who in Chinese mythology can rank as the Chinese God of Medicine ? This question is not easy to answer. In going through the North Kiangsu area, where Chinese medical and mythological lore is well developed, one sees several temples, altars and idols dedicated to various medicine gods. Probably none is more commonly wor shipped in drug shops of this part of the eountry than Shen Nung (神农). The physicians of the scholarly type, however, seem to prefer LLi Shun Yang (吕纯陽) as their patron saint. There are seve:ral other names mentioned in Chinese medicallore of this district as gods of medicine and are even today worshipped there, by Chinese old school physicians. Fu Hsi (伏羲), Shen Nung(神农), Huang Ti (黄帝) Hua T’o (华佗), chang Chung Ching (张仲景), Sun Ssu Mao (孙思貌), Pien Ch''iao (扁鹬) are all mentioned in North Kiangsti as gods of medicine. Some of these ate godsof specialists as some of their names indicate. Thus Chang Chung Ching is the god of medicine, Toh Wang(毒王) is the god of poison, Yen Kwang P''usa (眼光菩萨) is the god of eyesight.  相似文献   
708.
Ours was the first among the nations of Europe to set up institutions for rendering assistance to lepers in the Far East. . In 1569, but I2 years after the establishment of the Portuguese in Macao, an asylum for lepers was established within the territorial limits of the city of Macao, xvith a hospital and a chapel, maintained 4ut of funds of a pious institution the "Holy House of Charity".  相似文献   
709.
710.
PURPOSE: To test the efficacy of a combination of selective pre- and post-surgical local anesthetic infiltrations of the knee, compared with standard intra-articular injection at the end of surgery alone, to reduce postoperative opioid requirements following arthroscopic cruciate ligament reconstruction (ACLR). METHODS: In a double-blind, randomized, controlled trial, we studied 23 patients (ASA I or II) scheduled for elective ACLR under general anesthesia. The treatment group (n = 12) received infiltrations with bupivacaine 0.25% with epinephrine 1:200,000 presurgically (10 ml into the portals, 10 ml at the medial tibial incision site, 10 ml at the lateral femoral incision site, and 10 ml intra-articularly) and postsurgically (5 ml at the medial tibial incision and 10 ml at the lateral femoral incision). The control group (n = 11) received infiltrations with saline 0.9% in the same manner. All patients received a standard intra-articular local anesthetic instillation of the knee (25 ml of bupivacaine 0.25% with epinephrine 1:200,000) at the completion of surgery. RESULTS: Postoperative opioid requirements were lower in the treatment group (5.8 +/- 2.9 mg morphine equivalent) than in the control group ( 13.7 +/- 5.8 mg; P = 0.008). Treatment patients were ready for discharge approximately 30 min earlier than control patients (P = 0.046). There were no adverse events in the treatment group. In the control group, 2/11 patients vomited and a third experienced transient postoperative diaphoresis, dizziness and pallor. CONCLUSION: We conclude that a combination of selective pre- and post-surgical wound infiltration with bupivacaine 0.25% provides superior analgesia compared with a standard post-surgical intra-articular injection alone.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号