收费全文 | 19610篇 |
免费 | 974篇 |
国内免费 | 129篇 |
耳鼻咽喉 | 108篇 |
儿科学 | 628篇 |
妇产科学 | 523篇 |
基础医学 | 2242篇 |
口腔科学 | 576篇 |
临床医学 | 1425篇 |
内科学 | 5078篇 |
皮肤病学 | 316篇 |
神经病学 | 2156篇 |
特种医学 | 839篇 |
外国民族医学 | 2篇 |
外科学 | 2770篇 |
综合类 | 52篇 |
一般理论 | 3篇 |
预防医学 | 884篇 |
眼科学 | 240篇 |
药学 | 1044篇 |
中国医学 | 12篇 |
肿瘤学 | 1815篇 |
2023年 | 126篇 |
2022年 | 286篇 |
2021年 | 483篇 |
2020年 | 278篇 |
2019年 | 409篇 |
2018年 | 517篇 |
2017年 | 380篇 |
2016年 | 507篇 |
2015年 | 514篇 |
2014年 | 698篇 |
2013年 | 916篇 |
2012年 | 1395篇 |
2011年 | 1387篇 |
2010年 | 811篇 |
2009年 | 742篇 |
2008年 | 1340篇 |
2007年 | 1187篇 |
2006年 | 1262篇 |
2005年 | 1173篇 |
2004年 | 1157篇 |
2003年 | 1016篇 |
2002年 | 955篇 |
2001年 | 226篇 |
2000年 | 177篇 |
1999年 | 243篇 |
1998年 | 210篇 |
1997年 | 167篇 |
1996年 | 143篇 |
1995年 | 146篇 |
1994年 | 130篇 |
1993年 | 128篇 |
1992年 | 167篇 |
1991年 | 133篇 |
1990年 | 124篇 |
1989年 | 99篇 |
1988年 | 90篇 |
1987年 | 91篇 |
1986年 | 92篇 |
1985年 | 73篇 |
1984年 | 95篇 |
1983年 | 62篇 |
1982年 | 69篇 |
1981年 | 50篇 |
1980年 | 50篇 |
1979年 | 42篇 |
1978年 | 44篇 |
1977年 | 29篇 |
1974年 | 32篇 |
1973年 | 27篇 |
1972年 | 26篇 |
Background and objective
Erector spinae plane block is a valid technique to provide simultaneously analgesia for combined thoracic and abdominal surgery.Case report
A patient underwent open esophagectomy followed by reconstructive esophagogastroplasty but refused thoracic epidural analgesia; a multi‐modal analgesia with a multiple erector spinae plane block was then planned. Three erector spinae plane catheters (T5 and T10 on the right side and T9 on the left side) for continuous analgesia were placed before surgery. During the first 48 h pain was never reported in the thoracic area but the patient reported multiple times to feel a pain well localized in epigastrium, but never localized in any other abdominal quadrant.Discussion
Erector spinae plane block is a valid technique to provide analgesia simultaneously for combined thoracic and abdominal surgery and could be a valid alternative strategy if the use of epidural analgesia is contraindicated. 相似文献Methods: Patients were divided into two groups: Group A (22 patients) who underwent ACL reconstruction performed with an All-Inside graft-link technique; Group B (22 patients) who underwent ACL reconstruction with an Out-In technique and DGST graft. At a mean follow-up of 13 months, quadriceps and hamstring isokinetic peak torque deficits were recorded.
Results: In group A, the mean side to side peak torque flexion difference between the operated and non-operated limbs was ?3% and the mean torque at 30° was ?7.5% at high angular velocity (180°/sec); the mean peak flexion torque was 7.2% and the mean torque at 30° was 3.1% at low angular velocity (60°/sec).
In group B, the mean side to side peak flexion torque was ?3.5% and the mean torque at 30° was ?7.6% at high angular velocity (180°/sec); the mean peak flexion torque was ?7.2% and the mean torque at 30° was ?11% at low angular velocity (60°/sec).
A statistically significant difference was found between the two groups at lower angular velocity both for the mean peak flexion torque and the mean torque at 30° (p = 0.009), with better results in the study group.
Discussion/conclusion: Gracilis sparing technique is a minimally invasive technique for ACL reconstruction and yielded a significantly better flexion strength recovery at lower angular velocity compared to a full tibial tunnel technique with DGST for ACL reconstruction. 相似文献