全文获取类型
收费全文 | 18386篇 |
免费 | 1164篇 |
国内免费 | 194篇 |
专业分类
耳鼻咽喉 | 171篇 |
儿科学 | 404篇 |
妇产科学 | 448篇 |
基础医学 | 2712篇 |
口腔科学 | 705篇 |
临床医学 | 2205篇 |
内科学 | 3811篇 |
皮肤病学 | 360篇 |
神经病学 | 1742篇 |
特种医学 | 523篇 |
外科学 | 1854篇 |
综合类 | 127篇 |
一般理论 | 9篇 |
预防医学 | 1758篇 |
眼科学 | 261篇 |
药学 | 1490篇 |
中国医学 | 105篇 |
肿瘤学 | 1059篇 |
出版年
2024年 | 19篇 |
2023年 | 185篇 |
2022年 | 243篇 |
2021年 | 491篇 |
2020年 | 304篇 |
2019年 | 517篇 |
2018年 | 693篇 |
2017年 | 495篇 |
2016年 | 540篇 |
2015年 | 697篇 |
2014年 | 759篇 |
2013年 | 1068篇 |
2012年 | 1596篇 |
2011年 | 1630篇 |
2010年 | 769篇 |
2009年 | 642篇 |
2008年 | 1199篇 |
2007年 | 1286篇 |
2006年 | 1133篇 |
2005年 | 1067篇 |
2004年 | 1015篇 |
2003年 | 909篇 |
2002年 | 828篇 |
2001年 | 148篇 |
2000年 | 122篇 |
1999年 | 112篇 |
1998年 | 105篇 |
1997年 | 105篇 |
1996年 | 114篇 |
1995年 | 62篇 |
1994年 | 54篇 |
1993年 | 58篇 |
1992年 | 63篇 |
1991年 | 63篇 |
1990年 | 57篇 |
1989年 | 47篇 |
1988年 | 32篇 |
1987年 | 37篇 |
1986年 | 47篇 |
1985年 | 37篇 |
1984年 | 51篇 |
1983年 | 32篇 |
1982年 | 35篇 |
1981年 | 46篇 |
1980年 | 32篇 |
1979年 | 23篇 |
1978年 | 16篇 |
1977年 | 15篇 |
1975年 | 15篇 |
1970年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Post-induction hypotension is common and associated with postoperative complications. We hypothesised that pneumatic leg compression reduces post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy. In this double-blind randomised study, patients were allocated randomly to the pneumatic leg compression group (n = 50) or control (n = 50). In the intervention group, pneumatic leg compression was initiated before induction of anaesthesia. In the control group, pneumatic leg compression was initiated 20 min after anaesthesia induction. The primary outcome was the incidence of post-induction hypotension in these groups. Post-induction hypotension was defined as systolic blood pressure < 90 mmHg during the first 20 min after induction. Haemodynamic variables and area under the curve of post-induction systolic blood pressure over time were assessed. Complications associated with pneumatic leg compression were recorded, including: peripheral neuropathy; compartment syndrome; extensive bullae beneath the leg sleeves; and pulmonary thromboembolism. The incidence of post-induction hypotension decreased in the pneumatic leg compression group compared with that in the control group; 5 (10%) vs. 29 (58%), respectively, p < 0.001. In the pneumatic leg compression group, the lowest systolic, diastolic and mean blood pressures 20 min after induction of anaesthesia were significantly greater than the control group. Pneumatic leg compression resulted in an increased area under the curve of systolic blood pressure in the first 20 min after induction, p = 0.001. There were no pneumatic leg compression-related complications. Pneumatic leg compression reduced post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy, suggesting that it is an effective and safe intervention to prevent post-induction hypotension among elderly patients undergoing general anaesthesia. 相似文献
2.
Adilson Cunha Ferreira Edward Araujo Júnior Wellington P. Martins João Francisco Jordão Antônio Hélio Oliani Simon E. Meagher 《The journal of maternal-fetal & neonatal medicine》2015,28(14):1706-1710
Objective: To assess the quality of images and video clips of fetal central nervous (CNS) structures obtained by ultrasound and transmitted via tele-ultrasound from Brazil to Australia.Methods: In this cross-sectional study, 15 normal singleton pregnant women between 20 and 26 weeks were selected. Fetal CNS structures were obtained by images and video clips. The exams were transmitted in real-time using a broadband internet and an inexpensive video streaming device. Four blinded examiners evaluated the quality of the exams using the Likert scale. We calculated the mean, standard deviation, mean difference, and p values were obtained from paired t tests.Results: The quality of the original video clips was slightly better than that observed by the transmitted video clips; mean difference considering all observers = 0.23 points. In 47/60 comparisons (78.3%; 95% CI?=?66.4–86.9%) the quality of the video clips were judged to be the same. In 182/240 still images (75.8%; 95% CI?=?70.0–80.8%) the scores of transmitted image were considered the same as the original.Conclusion: We demonstrated that long distance tele-ultrasound transmission of fetal CNS structures using an inexpensive video streaming device provided images of subjective good quality. 相似文献
3.
4.
5.
6.
7.
8.
Sergio Barroilhet Adrián Cano-Prous Salvador Cervera-Enguix Maria João Forjaz Francisco Guillén-Grima 《Social psychiatry and psychiatric epidemiology》2009,44(12):1051-1065
Introduction
This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning. 相似文献9.
10.
Lesley B Milgrom Jo Ann Brooks Rong Qi Karen Bunnell Susie Wuestfeld Daniel Beckman 《American journal of critical care》2004,13(2):116-125
BACKGROUND: Acute pain is common after cardiac surgery and can keep patients from participating in activities that prevent postoperative complications. Accurate assessment and understanding of pain are vital for providing satisfactory pain control and optimizing recovery. OBJECTIVES: To describe pain levels for 5 activities expected of patients after cardiac surgery on postoperative days 1 to 6 and changes in pain levels after chest tube removal and extubation. METHODS: Adults who underwent cardiac surgery were asked to rate the pain associated with various types of activities on postoperative days 1 to 6. Pain levels were compared by postoperative day, activity, and type of cardiac surgery. Pain scores before and after chest tube removal and extubation also were analyzed. RESULTS: Pain scores were higher on earlier postoperative days. The order of overall pain scores among activities (P < .01) from highest to lowest was coughing, moving or turning in bed, getting up, deep breathing or using the incentive spirometer, and resting. Changes in pain reported with coughing (P = .03) and deep breathing or using the incentive spirometer (P = .005) differed significantly over time between surgery groups. After chest tubes were discontinued, patients had lower pain levels at rest (P = .01), with coughing (P = .05), and when getting up (P = .03). CONCLUSIONS: Pain relief is an important outcome of care. A comprehensive, individualized assessment of pain that incorporates activity levels is necessary to promote satisfactory management of pain. 相似文献