全文获取类型
收费全文 | 180762篇 |
免费 | 1184篇 |
国内免费 | 67篇 |
专业分类
耳鼻咽喉 | 1284篇 |
儿科学 | 6723篇 |
妇产科学 | 3033篇 |
基础医学 | 17132篇 |
口腔科学 | 1664篇 |
临床医学 | 12703篇 |
内科学 | 32130篇 |
皮肤病学 | 707篇 |
神经病学 | 16848篇 |
特种医学 | 9095篇 |
外科学 | 29949篇 |
综合类 | 2338篇 |
一般理论 | 1篇 |
预防医学 | 18261篇 |
眼科学 | 2760篇 |
药学 | 9637篇 |
中国医学 | 629篇 |
肿瘤学 | 17119篇 |
出版年
2023年 | 46篇 |
2022年 | 83篇 |
2021年 | 152篇 |
2020年 | 87篇 |
2019年 | 129篇 |
2018年 | 22052篇 |
2017年 | 17455篇 |
2016年 | 19656篇 |
2015年 | 1062篇 |
2014年 | 1018篇 |
2013年 | 992篇 |
2012年 | 7307篇 |
2011年 | 21368篇 |
2010年 | 19054篇 |
2009年 | 11706篇 |
2008年 | 19781篇 |
2007年 | 22022篇 |
2006年 | 926篇 |
2005年 | 2538篇 |
2004年 | 3714篇 |
2003年 | 4647篇 |
2002年 | 2759篇 |
2001年 | 330篇 |
2000年 | 466篇 |
1999年 | 245篇 |
1998年 | 292篇 |
1997年 | 255篇 |
1996年 | 153篇 |
1995年 | 151篇 |
1994年 | 141篇 |
1993年 | 109篇 |
1992年 | 75篇 |
1991年 | 108篇 |
1990年 | 159篇 |
1989年 | 98篇 |
1988年 | 73篇 |
1987年 | 55篇 |
1986年 | 41篇 |
1985年 | 44篇 |
1984年 | 35篇 |
1983年 | 38篇 |
1982年 | 37篇 |
1980年 | 60篇 |
1969年 | 25篇 |
1938年 | 60篇 |
1937年 | 25篇 |
1935年 | 22篇 |
1934年 | 30篇 |
1932年 | 56篇 |
1930年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Yamamoto S Sato Y Nakatsuka H Oya H Kobayashi T Hatakeyama K 《World journal of surgery》2007,31(6):1266-1271
BACKGROUND: Use of the inferior mesenteric vein (IMV) for partial portal decompression has not been recommended as a first-line option for intractable gastroesophageal variceal bleeding because of the thin diameter of the vein. Although these indications remain relevant, few reports have compared partial portal decompression using the IMV with other therapies. We propose that partial portal decompression using the IMV is a useful alternative treatment for intractable variceal bleeding. METHODS: We performed partial portal decompression using the IMV in eight patients with intractable variceal bleeding that had been uncontrolled using medical and endoscopic therapies. All patients were classified into Child's class B or C. The surgical data, morbidity, and mortality were assessed. RESULTS: Mean portal venous pressure significantly decreased from 26.9 +/- 2.0 mmHg before the surgery to 19.8 +/- 3.9 mmHg after the surgery. The operative mortality rate was 0%. The mean duration of hospital stay was 25.5 +/- 13.3 days. Although one patient experienced recurrent bleeding, shunt patency was well maintained in all patients during the follow-up period (mean 28.9 +/- 14.1 months). Six patients are still alive and well without ascites or hepatic encephalopathy. Two of the Child's class C patients who underwent emergency shunt died owing to hepatic decompensation. CONCLUSION: Partial portal decompression using the IMV can be a safe, effective way to treat intractable variceal bleeding in patients with liver cirrhosis. However, use of the shunt procedure may have the most survival benefits for cirrhotic patients with preserved liver function. 相似文献
992.
Akira Marui Keiichi Tambara Eiji Tadamura Yoshiaki Saji Nozomu Sasahashi Tadashi Ikeda Takeshi Nishina Masashi Komeda 《European journal of cardio-thoracic surgery》2007,32(2):308-312
OBJECTIVE: Left atrial (LA) volume reduction surgery concomitant with the maze procedure has been reported to facilitate sinus rhythm recovery even in patients with refractory atrial fibrillation (AF) with an enlarged LA. However, it is unknown whether the procedures can also restore effective atrial function of the enlarged LA with over-stretched myocardium. METHODS: The maze procedures in association with mitral valve surgery were performed to 57 AF patients with an enlarged LA (LA diameter >or=60mm). Among them, 32 patients had concomitant LA volume reduction surgery (VR group). Another 25 patients did not have the volume reduction (control group). RESULTS: Three months postoperatively LA end-diastolic volume (LAEDV, ml) assessed by magnetic resonance (MR) imaging was larger in the VR group than that in the control group (291+/-117 vs 223+/-81 ml, p<0.05). Postoperatively, sinus rhythm recovery rate was better (84 vs 68%, p<0.05) and LAEDV was drastically smaller (118+/-48 vs 203+/-76 ml, p<0.001) in the VR group than those in the control group. Among the patients with sinus rhythm recovery in both groups, LA contraction ejection fraction (%) improved in the VR group but not in the control group (22.3+/-7.8 vs 10.3+/-4.7%, p<0.001). CONCLUSIONS: The LA volume reduction surgery concomitant with the maze procedure restored contraction of the enlarged LA; however, the maze procedure alone did not restore LA contraction in spite of successful sinus rhythm recovery. LA volume reduction surgery may be desirable to the patients with refractory AF with over-stretched LA. 相似文献
993.
Orbital cavernous hemangiomas (CHs) manifest as slowly developing symptoms indicative of slow growth. The present study investigated the involvement of angiogenic factors and their receptors in the growth of orbital CHs. Surgical specimens of orbital CHs were obtained from nine patients. Formalin-fixed, paraffin-embedded specimens were stained immunohistochemically using antibodies against Ki-67, CD31, alpha-smooth muscle actin (alpha-SMA), vascular endothelial growth factor (VEGF), basic fibroblast growth factor (bFGF), and VEGF receptors (flt-1 and flk-1). CD31 was expressed in the single layer of endothelial cells lining the vascular cavity. The thick vascular walls were positive for alpha-SMA, indicating that the vascular walls were smooth muscle cells. Ki-67 antigen immunostaining was mostly positive in the vascular walls and the staining index ranged from 0% to 6.8% (mean +/- standard deviation, 2.7 +/- 1.9%). VEGF and bFGF immunostaining were positive in all specimens. Flt-1 immunostaining was negative in all specimens, but flk-1 immunostaining was positive in both endothelial cells and smooth muscle cells. These results suggest that both VEGF and its receptor flk-1 are important in the growth of orbital CH. 相似文献
994.
Bastiaan R Klarenbeek Alexander AFA Veenhof Elly SM de Lange Willem A Bemelman Roberto Bergamaschi Piet Heres Antonio M Lacy Wim T van den Broek Donald L van der Peet Miguel A Cuesta 《BMC surgery》2007,7(1):16
Backround
Diverticulosis is a common disease in the western society with an incidence of 33–66%. 10–25% of these patients will develop diverticulitis. In order to prevent a high-risk acute operation it is advised to perform elective sigmoid resection after two episodes of diverticulitis in the elderly patient or after one episode in the younger (< 50 years) patient. Open sigmoid resection is still the gold standard, but laparoscopic colon resections seem to have certain advantages over open procedures. On the other hand, a double blind investigation has never been performed. The Sigma-trial is designed to evaluate the presumed advantages of laparoscopic over open sigmoid resections in patients with symptomatic diverticulitis. 相似文献995.
José M Quintana Inmaculada Arostegui Antonio Escobar Iratxe Lafuente Juan C Arenaza Isidoro Garcia Urko Aguirre 《BMC musculoskeletal disorders》2007,8(1):84
Background
To develop a sensitive and specific screening tool for knee and hip osteoarthritis in the general population of elderly people. 相似文献996.
Background
Chronic plantar heel pain (CPHP) is one of the most common musculoskeletal disorders of the foot, yet its aetiology is poorly understood. The purpose of this study was to examine the association between CPHP and a number of commonly hypothesised causative factors. 相似文献997.
Background
Whilst evidence exists to support the use of single treatments such as orthoses and footwear, the effectiveness of podiatry-led care as a complex intervention for patients with rheumatoid arthritis (RA) related foot problems is unknown. The aim of this study was to undertake an exploratory randomised controlled parallel arm clinical trial (RheumAFooT) to inform the design and implementation of a definitive trial and to understand the potential benefits of this care. 相似文献998.
Background
Hip dislocation in children with cerebral palsy (CP) is a common and severe problem. The dislocation can be avoided, by screening and preventive treatment of children with hips at risk. The aim of this study was to analyse the characteristics of children with CP who develop hip displacement, in order to optimise a hip surveillance programme. 相似文献999.
Ulrich Weber Christian WA Pfirrmann Rudolf O Kissling Juerg Hodler Marco Zanetti 《BMC musculoskeletal disorders》2007,8(1):20
Background
Ankylosing spondylitis is a chronic inflammatory rheumatic disorder which usually begins in early adulthood. The diagnosis is often delayed by many years. MR imaging has become the preferred imaging method for detection of early inflammation of the axial skeleton in ankylosing spondylitis. 相似文献1000.