全文获取类型
收费全文 | 1576篇 |
免费 | 161篇 |
国内免费 | 49篇 |
专业分类
耳鼻咽喉 | 10篇 |
儿科学 | 104篇 |
妇产科学 | 36篇 |
基础医学 | 170篇 |
口腔科学 | 50篇 |
临床医学 | 147篇 |
内科学 | 422篇 |
皮肤病学 | 45篇 |
神经病学 | 65篇 |
特种医学 | 212篇 |
外科学 | 89篇 |
综合类 | 99篇 |
预防医学 | 97篇 |
眼科学 | 15篇 |
药学 | 110篇 |
中国医学 | 3篇 |
肿瘤学 | 112篇 |
出版年
2023年 | 18篇 |
2022年 | 14篇 |
2021年 | 32篇 |
2020年 | 28篇 |
2019年 | 14篇 |
2018年 | 29篇 |
2017年 | 46篇 |
2016年 | 45篇 |
2015年 | 38篇 |
2014年 | 70篇 |
2013年 | 90篇 |
2012年 | 65篇 |
2011年 | 54篇 |
2010年 | 78篇 |
2009年 | 85篇 |
2008年 | 50篇 |
2007年 | 85篇 |
2006年 | 47篇 |
2005年 | 39篇 |
2004年 | 40篇 |
2003年 | 29篇 |
2002年 | 25篇 |
2001年 | 43篇 |
2000年 | 22篇 |
1999年 | 26篇 |
1998年 | 80篇 |
1997年 | 66篇 |
1996年 | 65篇 |
1995年 | 52篇 |
1994年 | 46篇 |
1993年 | 44篇 |
1992年 | 13篇 |
1991年 | 13篇 |
1990年 | 24篇 |
1989年 | 25篇 |
1988年 | 27篇 |
1987年 | 18篇 |
1986年 | 26篇 |
1985年 | 23篇 |
1984年 | 17篇 |
1983年 | 14篇 |
1982年 | 15篇 |
1981年 | 7篇 |
1980年 | 9篇 |
1979年 | 8篇 |
1978年 | 8篇 |
1976年 | 12篇 |
1975年 | 12篇 |
1967年 | 5篇 |
1954年 | 8篇 |
排序方式: 共有1786条查询结果,搜索用时 46 毫秒
1.
By injecting small amounts of CO2 through a needle, one can move bowel or bladder from the intended path of instruments during interventional procedures. The technique worked well in six of seven cases in the pelvis and retroperitoneum; it was not effective in the mediastinum or midabdomen (n = 6). 相似文献
2.
Dyssynchronous ventricular contraction in severe heart failurecontributes to low cardiac output, worsening symptoms, and poorprognosis. Recognition of the effect of dyssynchrony in heartfailure, and the possibility of manipulating the sequence ofelectrical cardiac activation to improve the efficiency of mechanicalevents, led Cazeau et al. to attempt four-chamber pacing in1994.1 This early system could stimulate both atria and bothventricles extrinsically, and could dictate the temporal relationshipbetween atrial systole and ventricular systole, and the ventriculo-ventricularrelationship. Modern cardiac resynchronization therapy (CRT),involving pacing of the right and left ventricles, with rightatrial pacing to optimize atrio-ventricular delay, has evolvedrapidly from this beginning. Left bundle branch block (LBBB) on the surface electrocardiogram(ECG) has been considered a marker of mechanical dyssynchronyas it represents a delay in conduction of depolarization tothe left ventricle, with the greatest delay usually being in 相似文献
3.
外科医生和手术室人员经常接触手术设备产生的烟气,病人也会暴露于烟气中,特别是腹腔镜手术中产生的烟气滞留于腹腔内这一密闭空间并被吸收.这些烟气是一种与香烟烟气相似的毒性物质,然而对这种毒性物质的影响还未引起足够重视.应该采取必要措施尽可能减少手术中烟气的不良影响. 相似文献
4.
5.
6.
7.
8.
9.
Calciphylaxis – a topical overview 总被引:3,自引:0,他引:3
G Arseculeratne† AT Evans‡ SM Morley† 《Journal of the European Academy of Dermatology and Venereology》2006,20(5):493-502
'Calciphylaxis', a calcification syndrome associated with ischaemic cutaneous necrosis, is acquired naturally in humans in disease states. It is a life and limb-threatening complication, usually observed in patients with renal disease and secondary hyperparathyroidism, but known to occur in the absence of renal or parathyroid disease. The reported mortality rate, which ranges from 60-80%, relates to wound infection, sepsis and organ failure. It is a small-vessel vasculopathy, which is estimated to occur in about 4% of haemodialysis patients. Clinically, violaceous, reticulate areas of cutaneous necrosis and eschar may be evident, particularly in the extremities. In addition to the clinical picture, a raised calcium phosphorous product, an elevated parathyroid hormone level, radiographic evidence of vessel and soft-tissue calcification and the finding of mural calcification affecting small arteries and arterioles on histopathology help to confirm the diagnosis of this entity which generally has a poor prognosis. A high index of suspicion and an active multidisciplinary management approach, with rigorous attention to wound care and prevention of sepsis, are vital in the management of these patients. In this overview, we discuss the pathophysiology, clinical features and associations, risk factors, diagnosis and management issues relating to calciphylaxis. 相似文献
10.
The experiments on the model of aconitine-induced arrhythmia in anesthetized rats and awake dogs with cardiac rhythm disorders caused by the coronary artery occlusion showed that all four metabolites of bonnecor possessed the antiarrhythmic activity. Metabolite 4 proved to be the most active on both models of cardiac rhythm disorders. 相似文献