全文获取类型
收费全文 | 29146篇 |
免费 | 1765篇 |
国内免费 | 1102篇 |
专业分类
耳鼻咽喉 | 1020篇 |
儿科学 | 616篇 |
妇产科学 | 96篇 |
基础医学 | 1523篇 |
口腔科学 | 3526篇 |
临床医学 | 2791篇 |
内科学 | 4615篇 |
皮肤病学 | 35篇 |
神经病学 | 1499篇 |
特种医学 | 1915篇 |
外国民族医学 | 1篇 |
外科学 | 6996篇 |
综合类 | 4087篇 |
现状与发展 | 2篇 |
预防医学 | 535篇 |
眼科学 | 232篇 |
药学 | 1184篇 |
14篇 | |
中国医学 | 992篇 |
肿瘤学 | 334篇 |
出版年
2024年 | 92篇 |
2023年 | 558篇 |
2022年 | 795篇 |
2021年 | 1183篇 |
2020年 | 1174篇 |
2019年 | 1051篇 |
2018年 | 1072篇 |
2017年 | 905篇 |
2016年 | 1000篇 |
2015年 | 1080篇 |
2014年 | 2153篇 |
2013年 | 1935篇 |
2012年 | 1746篇 |
2011年 | 1859篇 |
2010年 | 1589篇 |
2009年 | 1450篇 |
2008年 | 1328篇 |
2007年 | 1380篇 |
2006年 | 1297篇 |
2005年 | 1079篇 |
2004年 | 919篇 |
2003年 | 829篇 |
2002年 | 682篇 |
2001年 | 561篇 |
2000年 | 483篇 |
1999年 | 478篇 |
1998年 | 398篇 |
1997年 | 351篇 |
1996年 | 292篇 |
1995年 | 294篇 |
1994年 | 263篇 |
1993年 | 249篇 |
1992年 | 212篇 |
1991年 | 156篇 |
1990年 | 128篇 |
1989年 | 134篇 |
1988年 | 114篇 |
1987年 | 100篇 |
1986年 | 94篇 |
1985年 | 109篇 |
1984年 | 83篇 |
1983年 | 37篇 |
1982年 | 76篇 |
1981年 | 58篇 |
1980年 | 54篇 |
1979年 | 38篇 |
1978年 | 29篇 |
1977年 | 18篇 |
1976年 | 18篇 |
1973年 | 8篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
Charles Seydoux Danièle Gillard Berguer Eric Eeckhout Frank Stumpe Michel Hurni Patrick Ruchat Hossein Sadeghi Jean-Jacques Goy 《Transplant international》1996,9(4):433-436
Transplant atherosclerotic coronary disease remains the leading cause of death in heart transplant recipients. We report the first case of coronary stent implantation in a heart graft for epicardial focal stenosis. Due to the lower rate of restenosis after stenting in the native coronary artery, we suggest that coronary stenting be considered an acceptable, first intention therapeutic option instead of angioplasty alone whenever possible. 相似文献
112.
V Legrand J Beckers M Fastrez P Marcelle C Marchal H E Kulbertus 《European heart journal》1991,12(3):451-457
Early and late prognosis after percutaneous balloon aortic valvuloplasty (PBAV) was assessed in 38 consecutive elderly patients (mean age, 78.5 +/- 6.1 years). Significant valve opening was achieved in 35 patients. The hospital mortality was 8% (three patients); two other patients died within the first month and three underwent aortic valve replacement. At 2 years follow-up, there were 10 additional deaths (seven cardiac deaths) and five patients had symptom recurrence managed by aortic valve replacement (3) or repeat PBAV (2). Overall, six patients underwent surgery without untoward events and six had repeat PBAV. Only two out of six patients with repeat PBAV had sustained improvement; one was referred to surgery and the remaining three died soon after the second PBAV. One- and 2-year survival were respectively 72 and 62% and percentage of survivors with persistent improvement 68 and 41%. Although aortic valve area after PBAV was associated with outcome, predictors of poor long-term prognosis were primarily related to the pre-operative haemodynamic status. Patients with pulmonary resistances greater than 400 dynes cm-1 s-5 had the poorest outcome (chi 2 = 18.4-P less than 0.0001). Overall, signs of heart failure were predictors of poor long term follow-up. These data indicate that long-term success of PBAV is mainly related to the left ventricular dysfunction noted prior to intervention. 相似文献
113.
胸腰椎爆裂骨折椎管内骨片侵入倾向与对策 总被引:5,自引:0,他引:5
根据98例中获得随访的39例的X线、CT和MRI(24例)影像学资料,分析胸腰椎爆裂骨折椎管内骨片侵入倾向及对策。将爆裂骨折侵入椎管分为四类八型,宜采用Harrington器械钢丝或椎弓根螺钉钢板轴向撑开系统,使骨折复位,椎管容积恢复,毋需行后路椎管减压。本组取得良好效果。仅对骨片游离型需要切开椎管直接摘除骨片。 相似文献
114.
为了探讨腰神经通道狭窄的病因,我们对224例腰椎间盘突出及腰椎管狭窄症患者进行了腰神经通道探查手术,结果发现其病因以腰部组织变性为主。除外伤及反复慢性腰部损伤引起腰部病变外,活动少,或很少进行腰部锻炼,体形肥胖也是引起腰神经通道狭窄日趋加重的致病因素。在治疗时强调不只满足于切除突出的椎间盘,应沿神经通道探查,清除一切卡压神经根的病变组织才能获得较好的治疗效果。我们随访197例,平均随访3a,优良率935%。 相似文献
115.
采用经皮弧式椎间盘切除器械治疗L_5~S_1椎间盘突出症22例,21例成功。术后优良率为86.4%。该器械能够避开髂嵴阻挡进入L_5~S_1椎间隙,并增加椎间盘切除量,提高经皮L_5~S_1椎间盘切除成功率。定位正确是成功的关键。 相似文献
116.
Tsutomu Saito Hiroyuki Horimi Tsuguo Hasegawa Toshiro Kamoshida 《Surgery today》1993,23(12):1081-1084
We report herein the case of a 42-year-old man in whom dyspnea on exertion was found to be caused by isolated tricuspid stenosis. Two-dimensional echocardiogram showed thickening of the tricuspid valve with a markedly enlarged right atrium. A color-flow Doppler examination-revealed severe tricuspid stenosis without regurgitation and a Doppler-derived tricuspid diastolic pressure gradient of 23 mmHg. At the time of surgery, the patient was noted to have a stenotic tricuspid valve with thickened leaflets, fused commissures, and almost normal chorda tendineae. The valve leaflets were teased apart to the scattered specimen, and tricuspid valve replacement was successfully performed. Microscopic examination of the specimen demonstrated infective endocarditis. Isolated acquired tricuspid stenosis is extremely rare and, to our knowledge, this is the first case of infective endocarditis being involved as the primary cause. 相似文献
117.
Background: Stomal stenosis (SS) and marginal ulcer (MU) are reported to occur in 9-20% and 2-13%, respectively, of patients
undergoing gastric bypass for morbid obesity. It is hypothesized that decreasing tension on the gastrojejunostomy by performing
limited small bowel resection (SBR) would decrease ischemia, thereby decreasing the likelihood of SS and MU. Methods: A retrospective
review of 150 consecutive gastric bypass patients operated by one surgeon from 1993 to 1996 was performed. The incidence of
SS and MU was compared in patients with and without SBR. Results: The overall rate of SS was 24.0% and that of MU was 9.3%:
the incidence of both was 2.0%. The incidence of SS in patients without SBR was 26.9% and with SBR was 19.6%. The incidence
of MU in patients without SBR was 8.9% and with SBR was 9.8%. Neither result was statistically significant by Fisher's exact
test. Conclusion: There is a trend towards a decrease in the incidence of SS in gastric bypass patients with concomitant SBR
although this did not reach clinical significance. 相似文献
118.
Yoshinori Hamada Masazumi Tsuji Munehisa Kogata Koshiro Hioki Tadashi Matsuda 《Surgery today》1995,25(8):754-756
We report herein a new method of performing laparoscopic pyloromyotomy for infantile hypertrophic pyloric stenosis, using refined surgical techniques. The pyloric tumor was immobilized by grasping the first portion of the duodenum and the anterior wall of the stomach, and electrocoagulation was used prior to incising the pyloric tumor to minimize bleeding during the procedure. Although this technique has been applied in only two patients so far, we present the details herein. We believe that with technical and instrumental refinements, the speed and safety of laparoscopic pyloromyotomy will improve and it will become an alternative to open surgery in pediatric patients. 相似文献
119.
Philippe Brun Heykel Kchouk Brigitte Mouchet Véronique Baudouin Alain Raynaud Chantal Loirat Annabelle Azancot-Benisty 《Pediatric nephrology (Berlin, Germany)》1997,11(1):27-30
To evaluate the reliability of Doppler ultrasonography (US) in identifying children with renal artery stenosis (RAS) among
those with hypertension, we compared Doppler US results in 22 hypertensive children (mean age 8.9±4.3 years), with (13 cases)
and without RAS at angiography, and in 33 normotensive children (mean age 8.8±4.7 years). We observed 2 false-negatives and
2 false-positives with Doppler US. Of the 2 false-negative diagnoses, 1 had RAS on an accessory renal artery located behind
a normal upper polar artery and the other was observed in a patient with bilateral multiple stenosis of the very distal segments
of renal arteries. The 2 false-positive diagnoses were due to sinuous left renal artery and to technical reasons, respectively.
In another patient, Doppler US showed a tight RAS, while arteriography was normal. RAS was subsequently confirmed by a second
arteriography. Peak systolic velocity values of Doppler US were significantly higher in patients with proven angiographic
RAS (3.44±0.66 m/s) than in hypertensive patients with normal renal arteries at angiography (0.99±0.35 m/s, P <0.0001) and normotensive healthy children (1.04±0.23 m/s, P <0.0001). With the use of multiple views, and the experience acquired with practice, false-negatives or false-positives due
to the geometry of the renal artery can be avoided. Nevertheless, very distal stenosis can be missed by Doppler US.
Received October 30, 1995; received in revised form April 16, 1996; accepted May 14, 1996 相似文献
120.
Summary. In recent years the continuity equation has been established as a valuable non-invasive method for calculating aortic valve area. The continuity equation cannot be used if there is calcification or sub-valvular stenosis in the left ventricle-outflow tract, because the area of the outflow trace is not circular in those cases. The authors have tested the value of a non-invasive variant of the Gorlin formula, as an alternative method of identifying severe aortic stenosis. They examined 32 consecutive patients with aortic stenosis with both methods. Seventeen patients had severe stenosis (valve area^0–7 cm2), calculated by the continuity equation. The other 15 patients had moderate stenosis (valve area 0–7–1–0 cm2). Using the non-invasive variant of the Gorlin formula, the authors were able to identify 16 of the 17 cases with severe stenosis, thus showing that the method is useful for identifying severe aortic stenosis. (P<0–001 by x2-test). 相似文献