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 31 毫秒
951.
952.
953.
954.
955.
956.
957.
958.
959.
The objective of this study was to examine the efficacy of a caudal epidural anaesthesia using lidocaine or xylazine in a high volume for analgesia of the flank, navel and hamstring tendon. Fourteen calves weighing 57.7 ± 5.1 kg and 37.9 ± 9.3 (mean ± SEM) days old were randomly divided into two groups of seven calves each. Calves belonging to the lidocaine group were given a 2% lidocaine solution in the sacrococcygeal vertebral space epidurally at a volume of 0.4 ml/kg (8 mg/kg) body weight (BW). Animals of the xylazine group were administered an epidural anaesthesia with xylazine at a dose of 0.1 mg/kg BW, diluted with a 0.9% saline solution to a corresponding final volume of 0.4 ml/kg BW. Heart rate and respiratory rate were measured and the degree and duration of analgesia was determined by the response to a skin prick with a hypodermic needle over a period of 350 min after epidural injection. After epidural anaesthesia with lidocaine the mean heart rate increased during dorsal recumbency, whereas after xylazine both heart rate and respiratory rate decreased significantly (P < 0.05). The epidural injection of xylazine compared with lidocaine caused longer (P < 0.05) analgesia at the hamstring tendon (mean ± SEM, 120.7 ± 29.7 min versus 93.6 ± 3.5 min) and at the flank (100.7 ± 24.4 min versus 78.3 ± 11.1 min). There were no differences in the intensity of analgesia between groups. After xylazine application analgesia at the navel was achieved for 95.0 ± 14.1 min whereas after lidocaine injection sufficient analgesia at the navel was found in just two of seven calves for 55 and 95 min respectively. Based on above experiences, a second study was performed, in which a combination of xylazine and local anaesthetics was used and the injection volume was increased to prove the efficacy of caudal epidural anaesthesia in 15 calves (26.3 ± 26.7 days; 57.1 ± 19.5 kg) submitted to the clinic for regular umbilical surgery. In these cases the xylazine (0.1 mg/kg BW) was diluted with 2% lidocaine (n = 7) or 2% procaine (n = 8) to a corresponding final volume of 0.5–0.6 ml/kg BW. In all cases complete anaesthesia of the surgical area was achieved and no adverse effects were observed. Overall the high volume caudal epidural anaesthesia represents an effective, safe, cheap and easy to perform alternative for anaesthesia of the navel, flank and hamstring tendon in calves without major side effects. 相似文献
960.
Kimberly A. Varker Edward W. Martin Dori Klemanski Bryan Palmer Manisha H. Shah Mark Bloomston 《Journal of gastrointestinal surgery》2007,11(12):1680-1685
Background
Transarterial chemoemobolization (TACE) is commonly used to treat metastatic carcinoid tumors; however, the management of
progressive disease is less clear. We sought to determine if patients with disease progression after TACE would benefit from
repeat TACE.
Methods
The records of 27 patients undergoing repeat TACE for radiologic or symptomatic progression after TACE for metastatic carcinoid
were reviewed and compared to 122 undergoing first TACE. Overall and progression-free survivals were estimated by the Kaplan–Meier
method.
Results
Mean disease-free interval after first TACE was 11.8 months. Radiologic response was observed in 61% compared to 82% after
first TACE (p = 0.058); hormone response in 64% compared to 80% (p = 0.159); and symptomatic response in 77% compared to 92% (p = 0.053). The complication rate after repeat TACE was lower than after first TACE (p = 0.03). Median overall survival was similar after repeat (28.1 months) and first TACE (33.3 months) (p = 0.53). Progression-free survival was shorter after repeat TACE but not significantly so. No factor examined could predict
survival after repeat TACE.
Conclusion
Repeat TACE for patients with hepatic carcinoid metastases failing first TACE or having evidence of disease progression is
safe and offers a viable treatment option.
Presented at the 48th Annual Meeting of The Society for Surgery of the Alimentary Tract, Washington, DC, May, 2007. 相似文献