全文获取类型
收费全文 | 216384篇 |
免费 | 4226篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 1445篇 |
儿科学 | 8178篇 |
妇产科学 | 4218篇 |
基础医学 | 21361篇 |
口腔科学 | 2205篇 |
临床医学 | 19628篇 |
内科学 | 37836篇 |
皮肤病学 | 1249篇 |
神经病学 | 20206篇 |
特种医学 | 9769篇 |
外科学 | 32407篇 |
综合类 | 2868篇 |
一般理论 | 88篇 |
预防医学 | 23875篇 |
眼科学 | 3177篇 |
药学 | 11808篇 |
中国医学 | 653篇 |
肿瘤学 | 19720篇 |
出版年
2023年 | 269篇 |
2022年 | 349篇 |
2021年 | 772篇 |
2020年 | 606篇 |
2019年 | 1064篇 |
2018年 | 22829篇 |
2017年 | 18037篇 |
2016年 | 20299篇 |
2015年 | 1891篇 |
2014年 | 2120篇 |
2013年 | 2819篇 |
2012年 | 9730篇 |
2011年 | 23842篇 |
2010年 | 20286篇 |
2009年 | 12887篇 |
2008年 | 22071篇 |
2007年 | 24428篇 |
2006年 | 3260篇 |
2005年 | 4832篇 |
2004年 | 5889篇 |
2003年 | 6704篇 |
2002年 | 4734篇 |
2001年 | 779篇 |
2000年 | 860篇 |
1999年 | 635篇 |
1998年 | 766篇 |
1997年 | 618篇 |
1996年 | 489篇 |
1995年 | 483篇 |
1994年 | 418篇 |
1993年 | 368篇 |
1992年 | 384篇 |
1991年 | 406篇 |
1990年 | 425篇 |
1989年 | 369篇 |
1988年 | 320篇 |
1987年 | 281篇 |
1986年 | 262篇 |
1985年 | 290篇 |
1984年 | 228篇 |
1983年 | 230篇 |
1982年 | 235篇 |
1981年 | 210篇 |
1980年 | 243篇 |
1979年 | 127篇 |
1978年 | 140篇 |
1977年 | 107篇 |
1976年 | 90篇 |
1975年 | 78篇 |
1974年 | 95篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
Chad G. Ball Andrew W. Kirkpatrick Matthew Smith Robert H. Mulloy Leonard Tse Ian B. Anderson 《European journal of trauma and emergency surgery》2007,33(5):550-552
Abstract We report a case of SMV injury in a critically ill patient. The patient was a 19-year-old woman involved in a motor vehicle
collision. Her injuries included grade II splenic and renal lacerations, devascularized and lacerated right and transverse
colon, a transected transverse mesocolon, a massive shear injury of her abdominal wall, and two partial SMV transections.
At initial damage control laparotomy, the SMV was ligated, the devascularized bowel resected and a temporary abdominal closure
applied. At re-operation, a mesocaval shunt using saphenous vein was employed. The shunt failed and the patient required a
saphenous vein jump graft. Although visceral vascular injuries are rare, ligation of the SMV in a damage control situation
is acceptable. This case study is the first to discuss appropriate treatment when interruption to a patient's collateral visceral
venous drainage limits the surgeon’s ability to ligate. In these situations, bypass shunts may be successful. 相似文献
53.
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
54.
Henry Cisneros 《AIDS and behavior》2007,11(2):7-8
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference. 相似文献
55.
56.
Background
Reports on childhood cancer survivors estimated cumulative probability of developing secondary neoplasms vary from 3,3% to 25% at 25 years from diagnosis, and the risk of developing another cancer to several times greater than in the general population. 相似文献57.
58.
Birgitta Malmberg Göran Kecklund Björn Karlson Roger Persson Per Flisberg Palle Ørbaek 《BMC health services research》2010,10(1):239
Background
It is well known that physicians' night-call duty may cause impaired performance and adverse effects on subjective health, but there is limited knowledge about effects on sleep duration and recovery time. In recent years occupational stress and impaired well-being among anaesthesiologists have been frequently reported for in the scientific literature. Given their main focus on handling patients with life-threatening conditions, when on call, one might expect sleep and recovery to be negatively affected by work, especially in this specialist group. The aim of the present study was to examine whether a 16-hour night-call schedule allowed for sufficient recovery in anaesthesiologists compared with other physician specialists handling less life-threatening conditions, when on call. 相似文献59.
David Berrigan Linda W Pickle Jennifer Dill 《International journal of health geographics》2010,9(1):20
Background
Past studies of associations between measures of the built environment, particularly street connectivity, and active transportation (AT) or leisure walking/bicycling have largely failed to account for spatial autocorrelation of connectivity variables and have seldom examined both the propensity for AT and its duration in a coherent fashion. Such efforts could improve our understanding of the spatial and behavioral aspects of AT. We analyzed spatially identified data from Los Angeles and San Diego Counties collected as part of the 2001 California Health Interview Survey. 相似文献60.
Sebastiana Z. Kalula G. H. Swingler A. A. Sayer M. Badri M. Ferreira 《The journal of nutrition, health & aging》2010,14(4):319-323