全文获取类型
收费全文 | 3237篇 |
免费 | 97篇 |
国内免费 | 58篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 170篇 |
妇产科学 | 56篇 |
基础医学 | 165篇 |
口腔科学 | 76篇 |
临床医学 | 110篇 |
内科学 | 708篇 |
皮肤病学 | 63篇 |
神经病学 | 101篇 |
特种医学 | 55篇 |
外科学 | 586篇 |
综合类 | 306篇 |
预防医学 | 86篇 |
眼科学 | 83篇 |
药学 | 156篇 |
中国医学 | 613篇 |
肿瘤学 | 46篇 |
出版年
2024年 | 8篇 |
2023年 | 27篇 |
2022年 | 26篇 |
2021年 | 59篇 |
2020年 | 60篇 |
2019年 | 296篇 |
2018年 | 198篇 |
2017年 | 114篇 |
2016年 | 39篇 |
2015年 | 53篇 |
2014年 | 117篇 |
2013年 | 68篇 |
2012年 | 132篇 |
2011年 | 116篇 |
2010年 | 92篇 |
2009年 | 51篇 |
2008年 | 42篇 |
2007年 | 52篇 |
2006年 | 28篇 |
2005年 | 19篇 |
2004年 | 32篇 |
2003年 | 20篇 |
2002年 | 24篇 |
2001年 | 27篇 |
2000年 | 20篇 |
1999年 | 18篇 |
1998年 | 15篇 |
1997年 | 10篇 |
1996年 | 11篇 |
1995年 | 10篇 |
1994年 | 11篇 |
1993年 | 10篇 |
1992年 | 6篇 |
1991年 | 6篇 |
1990年 | 11篇 |
1989年 | 5篇 |
1988年 | 5篇 |
1985年 | 121篇 |
1984年 | 183篇 |
1983年 | 147篇 |
1982年 | 178篇 |
1981年 | 150篇 |
1980年 | 144篇 |
1979年 | 134篇 |
1978年 | 118篇 |
1977年 | 87篇 |
1976年 | 103篇 |
1975年 | 72篇 |
1974年 | 59篇 |
1973年 | 57篇 |
排序方式: 共有3392条查询结果,搜索用时 15 毫秒
1.
2.
A. Montalto V. Piazza F. Albi R. Gherli C. Contento A. Palermo F. Musumeci 《Transplantation proceedings》2019,51(1):206-209
Background
Pump speed optimization in patients implanted with a ventricular assist device represents a major challenge during the follow-up period. We present our findings on whether combined invasive hemodynamic ramp tests and cardiopulmonary exercise testing (CPX) can help optimize patient management.Methods
Eighteen patients implanted with a HeartMate 3 (HM3) device underwent ramp tests with right heart catheterization (including central venous pressure [CVP], pulmonary artery pressure, pulmonary capillary wedge pressure [PCWP], and blood pressure) and echocardiography. Data were recorded at up to 4 speed settings. Speed changes were in steps of 200 revolutions/min (rpm). Evaluation of functional capacity by CPX was conducted according to the modified Bruce protocol.Results
Only 30% of patients had normal PCWPs at their original rpm settings. In going from lowest to highest speeds, cardiac output improved by 0.25 ± 0.35 L/min/step (total change, 1.28 ± 0.3 L/min), and PCWP decreased by 1.9 ± 0.73 mm Hg/step (total change, 6 ± 1.6 mm Hg). CVP and systolic blood pressure did not change significantly with rpm. The rpm assessment was adjusted based on test results to achieve CVPs and PCWPs as close to normal limits as possible, which was feasible in all patients. On CPX, all patients demonstrated good performance (peak VO2, 16.8 ± 3.5 mL/kg/min).Conclusion
Hemodynamic ramp testing provides an objective means of optimizing rpm, and has the potential to provide good exercise tolerance. 相似文献3.
4.
5.
对四种同季不同产地采集的“三颗针”不同部位的四种生物碱进行了含量测定和分析,为该类药材的质量研究、生药采收、药厂选投料及开发应用等提供了科学依据。同时对该类资源的可持续利用也具有积极意义。 相似文献
6.
The acute effects of the deposition of papain in the lungs of 4-month-old rabbits have been investigated with an amount not sufficient to cause emphysematous changes. During the first 2 days of in vivo deposition when hemorrhaging and inflammation occur, the total amounts of collagen and elastin in the lung, into which the papain had been instilled, did not change but the concentrations of collagen and elastin decreased 20 and 25% respectively. The rates of synthesis of collagen and other proteins doubled. By 4 weeks, collagen and elastin concentrations returned to, or were slightly above, control levels. The histological appearance and mean linear intercepts of lung sections and the compliance curves of excised lungs of the treated animals were similar to controls by 2 weeks after papain administration. The rabbit lung thus appears able to repair mild injury due to proteolytic enzymes. 相似文献
7.
Two mediated smoking cessation programs were subjected to a field evaluation. The Quit Kit is a printed self-help package, and "Calling It Quits" consists of five segments which were aired on the local television news. A sample of 239 persons requested the Quit Kit and were followed. At the 2-month and 12-month follow-ups, respectively, 13.6% and 17.9% of those surveyed reported abstinence. Results indicate the potential of mediated interventions. 相似文献
8.
9.
10.
自1987年迄今,用金石散(4-6胶囊/次,2-3次/天)治疗胆结石患者177例,3月为一疗程,共2-4疗程。治疗前后均经B超检查以判断疗效。结果显示:1.服药一月,90%病人的发热、腹胀、疼痛等临床症状消失。2、62例胆囊结石经服药平均8.18+7.14月后,3例结石完全消失(4.84%),37例结石减少变小,总有效率64.52%;而临床类型型相似的另外23例,用UDCA治疗作为对照组,总有效率 相似文献