首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   7440篇
  免费   411篇
  国内免费   8篇
耳鼻咽喉   54篇
儿科学   279篇
妇产科学   229篇
基础医学   769篇
口腔科学   24篇
临床医学   1098篇
内科学   1259篇
皮肤病学   117篇
神经病学   712篇
特种医学   171篇
外科学   865篇
综合类   77篇
一般理论   20篇
预防医学   998篇
眼科学   162篇
药学   389篇
中国医学   4篇
肿瘤学   632篇
  2024年   6篇
  2023年   41篇
  2022年   65篇
  2021年   158篇
  2020年   86篇
  2019年   182篇
  2018年   215篇
  2017年   156篇
  2016年   157篇
  2015年   136篇
  2014年   233篇
  2013年   390篇
  2012年   586篇
  2011年   624篇
  2010年   345篇
  2009年   302篇
  2008年   509篇
  2007年   550篇
  2006年   530篇
  2005年   528篇
  2004年   473篇
  2003年   464篇
  2002年   435篇
  2001年   66篇
  2000年   54篇
  1999年   70篇
  1998年   64篇
  1997年   52篇
  1996年   40篇
  1995年   44篇
  1994年   29篇
  1993年   32篇
  1992年   34篇
  1991年   27篇
  1990年   18篇
  1989年   11篇
  1988年   26篇
  1987年   19篇
  1986年   18篇
  1985年   7篇
  1984年   8篇
  1983年   13篇
  1982年   8篇
  1981年   6篇
  1977年   4篇
  1975年   5篇
  1974年   4篇
  1970年   4篇
  1969年   3篇
  1968年   5篇
排序方式: 共有7859条查询结果,搜索用时 15 毫秒
101.

Background

Critical hand ischemia owing to below-the-elbow atherosclerotic occlusive disease is relatively uncommon. The aim of this study was to examine the outcomes in patients presenting with critical ischemia owing to below-the-elbow arterial atherosclerotic disease who underwent nonoperative and operative management.

Methods

A database of patients undergoing operative and nonoperative management for symptomatic below-the-elbow atherosclerotic disease between 2006 and 2016 was retrospectively queried. Patients with critical ischemia (tissue loss and rest pain) were identified. Three management groups were identified: no revascularization (None), endovascular revascularization (Endo), and open revascularization by bypass (Bypass). Patients with acute embolism, active vasculitis, end-stage renal disease, ipsilateral dialysis access complications of steal, and ipsilateral trauma were excluded.

Results

One hundred eight patients (56% male; average age, 59 years) presented with symptomatic below-the-elbow disease: 93% presented with digital ulceration and the remainder with rest pain. Eighty-one percent had diabetes and 41% had chronic renal insufficiency (not on dialysis). All underwent catheter-based angiography. Fifty-three patients (49%) had no intervention and subsequently were committed to wound care; 26 of these required no further intervention, 10 had an interval palmar sympathectomy, and 17 underwent either a phalanx or digital amputation. Thirty-four patients (31%) underwent an endovascular intervention with a median of 1.5 vessels (ulnar, radial, or interosseous arteries) intervened on. Technical success was achieved in 29 patients (85%). Of the five technical failures, two went on to bypass, one had a focal endarterectomy and patch angioplasty, and one was treated conservatively. Ten patients in the Endo group required either a phalanx or digital amputation. Twenty-one patients (19%) underwent a saphenous vein bypass (reversed or nonreserved) to the radial in 12 and the ulnar in 11 limbs. In follow-up, 11 patients underwent open or endovascular intervention to maintain patency of the bypass. There were nine phalanx or digital amputations in the Bypass group. No below-the-elbow or above-the-elbow amputations were performed within 30 days. The wound healing rate without amputation was 78% (85 of 108). The predictors of wound healing were technical success of the revascularization, intact palmar arch and presence of digital run-off. The presence of an incomplete arch and poor digital run-off were associated with a phalanx or digital amputation.

Conclusions

Upper extremity interventions for critical ischemia are associated with a high rate of success. Major amputations are rare and the many can be treated nonoperatively. In appropriately selected patients, both endovascular and open interventions have a high rate of success.  相似文献   
102.
103.
104.
One of the major strengths of nuclear myocardial perfusion imaging (MPI) is the robust prognostic databases from observational studies demonstrating significantly different outcomes in patients with low-risk vs high-risk scans. The severity of the MPI defect can be semi-quantitated using the summed stress score (SSS) and summed difference score (SDS). SSS is more strongly associated with mortality, whereas SDS is the better predictor of subsequent coronary angiography and revascularization. The strength of MPI variables as prognostic indicators decreases when adjusted for prognostically important clinical and stress test variables. Nonetheless, most studies of general patient populations have demonstrated that MPI adds incremental prognostic value to clinical and stress test information. In contrast to these positive results from observational studies, the application of MPI ischemia as a treatment guide in several recent trials (DIAD, WOMEN, COURAGE, BARI 2D, STICH) has largely failed to identify patient subsets with improved outcome. This issue will continue to be investigated in the ongoing PROMISE and ISCHEMIA trials.  相似文献   
105.
The current study evaluated the impact of a behavioral intervention (Be In Charge!), targeting caloric intake and weight gain in children with CF, on family interactions at mealtime. Forty-five families of children with cystic fibrosis (CF), ages 4 to 12 years, were randomized to Be In Charge! or nutrition education and assessed using the McMaster Mealtime Family Interaction Coding System. No differences were found in family functioning between the two interventions pre- to posttreatment or 1-year follow-up, except for Affect Management. A significantly greater percentage of families receiving Be In Charge! demonstrated improvement in Affect Management from pretreatment to 1-year follow-up. Implications for developing the next generation of behavioral interventions are discussed.  相似文献   
106.
107.
108.
109.
harwood l., wilson b., sontrop j. & clark a.m. (2012)?Chronic kidney disease stressors influence choice of dialysis modality. Journal of Advanced Nursing68(11), 2454-2465. ABSTRACT: Aim. This article is a report of a study examining the relationships between chronic kidney disease stressors and coping strategies with dialysis modality. Background. People with chronic kidney disease are given information to enable dialysis modality choice. This education increases awareness and may alleviate concerns and stress. Disease-related stressors and coping may affect dialysis selection. Understanding the influence of stress and coping on dialysis choices will assist in providing responsive programmes. Reducing stress and encouraging coping may increase home dialysis which, despite economic and patient benefits, remains underused. Design. A prospective correlational design was used. Methods. Information was obtained from the Chronic Kidney Disease Stress Inventory and the Jalowiec Coping Scale in 223 individuals not on dialysis between the years 2005-2007. Data were recorded with respect to modality at dialysis initiation (n?=?76) from 2005-2010. The effects of stress, coping and patient parameters on modality selection were compared using bivariate and multivariate analyses. Results. Individuals on home dialysis vs. in-centre haemodialysis reported significantly fewer pre-dialysis stressors. Coping was not associated with dialysis modality. Individuals on in-centre haemodialysis had a lower serum creatinine, less advanced kidney disease and weighed more than those who started on a home therapy. Physiological stressors were most common and are amenable to interventions. Conclusion. Pre-dialysis stress levels predicted dialysis modality. Interventional studies are recommended to address chronic kidney disease stressors with the outcome of improving home-dialysis usage.  相似文献   
110.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号