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   1131篇
  免费   90篇
  国内免费   63篇
耳鼻咽喉   2篇
儿科学   47篇
妇产科学   4篇
基础医学   109篇
口腔科学   24篇
临床医学   91篇
内科学   231篇
皮肤病学   46篇
神经病学   18篇
特种医学   282篇
外科学   154篇
综合类   64篇
预防医学   30篇
眼科学   5篇
药学   101篇
肿瘤学   76篇
  2022年   4篇
  2021年   17篇
  2020年   3篇
  2019年   9篇
  2018年   9篇
  2017年   6篇
  2016年   11篇
  2015年   14篇
  2014年   22篇
  2013年   21篇
  2012年   7篇
  2011年   17篇
  2010年   25篇
  2009年   31篇
  2008年   20篇
  2007年   53篇
  2006年   32篇
  2005年   39篇
  2004年   20篇
  2003年   22篇
  2002年   20篇
  2001年   32篇
  2000年   20篇
  1999年   35篇
  1998年   61篇
  1997年   66篇
  1996年   58篇
  1995年   64篇
  1994年   38篇
  1993年   46篇
  1992年   23篇
  1991年   25篇
  1990年   27篇
  1989年   51篇
  1988年   43篇
  1987年   40篇
  1986年   31篇
  1985年   35篇
  1984年   22篇
  1983年   16篇
  1982年   19篇
  1981年   21篇
  1980年   21篇
  1979年   17篇
  1978年   11篇
  1977年   20篇
  1976年   17篇
  1975年   12篇
  1972年   3篇
  1970年   2篇
排序方式: 共有1284条查询结果,搜索用时 0 毫秒
1.
2.
3.
Functional Outcome After Surgical Treatment of Esophageal Perforation   总被引:1,自引:0,他引:1  
Background. The functional results after treatment of intrathoracic esophageal perforations have been poorly documented.

Methods. A retrospective review of 42 patients who underwent treatment of intrathoracic esophageal perforation associated with benign esophageal disease was performed.

Results. Of 42 patients treated for esophageal perforation, 25 underwent primary repair, 15 underwent esophagectomy and reconstruction, 1 underwent cervical esophagostomy and drainage followed by esophageal resection, and 1 had drainage alone followed by primary repair. Among the patients treated with primary repair, at least one additional operation was required in 13 patients. Of the 15 patients treated with esophagectomy and reconstruction, none required further operative treatment. Follow-up averaged 3.7 years, and of the 36 survivors available for follow-up, 18 (50%) required at least one esophageal dilation postoperatively, and 3 (8.3%) have required regular dilations. Subjectively, 19 of 36 patients (53%) indicate that their swallowing is better than before perforation, it was the same in 12 (33%), and worse in 4 (11%).

Conclusions. In conclusion, approximately one third of patients surviving primary repair of esophageal perforations have continued difficulty with swallowing, which often requires esophageal dilations or esophageal reconstructive procedures, or a combination of both. Optimal long-term results are achieved when primary repair is performed in patients with motor disorders or a “normal” esophagus. Esophagectomy is a better option in those patients with strictures or diffuse esophageal disease.  相似文献   

4.
Proximal femoral focal deficiency, an uncommon congenital anomaly, necessitates early radiologic classification for surgical planning and treatment. Objective radiographic criteria, including femoral length index, acetabular depth index, acetabular angle index, and shape of the proximal femur were determined in 49 patients before cartilaginous ossification of the femoral capital epiphysis; final classification was based on follow-up radiographs or findings at arthrography or surgery. These parameters were analyzed to determine the accuracy and contributions of each in classification. Correct classification into one of three groups was possible in 86% of cases with use of three of the parameters: femoral length index, acetabular depth index, and shape of the proximal femur. The acetabular angle was found to contribute insignificantly to classification. Magnetic resonance imaging, used in only one case, depicted the nonossified cartilaginous femoral capital epiphysis, thus obviating the need for invasive diagnostic procedures and facilitating early classification.  相似文献   
5.
Hereditary spherocytosis is a clinically heterogeneous, genetically determined red blood cell membrane disorder resulting in hemolytic anemia. A deficiency of spectrin, the largest and most abundant structural protein of the erythrocyte membrane skeleton, results in the formation of spherocytes which lack the strength, durability, and flexibility to withstand the stresses of the circulation. Clinical manifestations of the disease are primarily dependent on the severity of hemolysis, which additionally results in an increased incidence of pigment gallstones. The likelihood of cholelithiasis is directly related to patient age and is uncommon before 10 years of age. Splenectomy is indicated in virtually every patient. When the disease is diagnosed in early childhood, the risk of overwhelming postsplenectomy sepsis makes it advisable to delay splenectomy until after 6 years of age if possible. At the time of splenectomy, it is important to identify and remove any accessory spleens. If gallstones are present, cholecystectomy should be performed. Although spherocytosis persists following splenectomy, hemolysis is alleviated and clinical cure of the anemia is achieved for most patients. Patients with recessively inherited spherocytosis are exceptions. Although they are significantly benefited by splenectomy, their anemia is not completely corrected. Splenectomy reduces hemolysis in all patients and thereby decreases the risk for development of pigment gallstones. Excision of an enlarged spleen removes the danger of traumatic rupture.  相似文献   
6.
7.
8.
Background: Recent development of extracorporeal magnetic stimulation (ECMS) which uses current‐changing magnetic fields allows the induction of electrical stimulation in the desired deep tissue. Recent study showed the sacral nerve stimulation reduces corticoanal excitability that may play a functional role in anal continence mechanisms. Preliminary study shows that ECMS of sacral nerve can modify pelvic floor function and expel rectal balloon in patients with pelvic floor dyssynergia (PFD). Aims: To evaluate the effect of ECMS compared with biofeedback therapy (BF) in patients with PFD. Methods and Materials: Thirty‐eight patients who fulfilled Rome II criteria for PFD by colon transit time and anorectal function tests, were randomly treated with 8 sessions of ECMS (2/weeks; n = 19) at prone position or BF (2/weeks; n = 19) at sitting position. Stimulation parameters were set at 50–80% of maximum intensity, 10 and 50 Hz frequency, 3 s burst length with 3 and 6 s off using arm‐typed stimulator (BioCom‐1000, Mcube Co., Korea). Symptom scores for constipation with/without anorectal function test were repeatedly measured after each treatment. Response was defined as 50% or more decreased symptom score after treatment (partial response: 30–50%, poor: <30%). Results: Fifteen patients (age 49.1 ± 13.4 years, mean ± SD; 4 men) completed 8 session of BF and 14 patients (54.5 ± 17.6 years, 3 men) completed 8 session of ECMS. Four patients of BF group discontinued treatment due to unsatisfactory therapeutic effect (n = 1) and withdrew consent (n = 3) and 5 patients of ECMS group discontinued treatment because of same reasons (n = 1, 4). Total symptom scores were significantly decreased after treatment of 8 session in both treatment groups (13.4 ± 6.6 vs. 4.3 ± 4.0 for BF, p = 0.009; 14.9 ± 5.6 vs. 3.4 ± 4.0 for ECMS, p < 0.001). Bowel movements per week were also significantly increased after treatment in both groups (median 2 vs. 7 for BF, p = 0.035; median 2 vs. 7 for ECMS, p = 0.008). Thirteen out of 15 patients showed response in BF group and 12 out of 14 showed good response in ECMS group. No adverse effects in both groups. Conclusions: ECMS is as effective as BF for the treatment of PFD. Long‐term effect of ECMS for the patients with pelvic floor dyssynergia need to be evaluated in the near future.  相似文献   
9.
10.
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