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   506篇
  免费   27篇
  国内免费   2篇
耳鼻咽喉   1篇
儿科学   39篇
妇产科学   20篇
基础医学   56篇
口腔科学   15篇
临床医学   45篇
内科学   86篇
皮肤病学   14篇
神经病学   23篇
特种医学   36篇
外科学   51篇
综合类   22篇
预防医学   22篇
眼科学   18篇
药学   53篇
中国医学   1篇
肿瘤学   33篇
  2023年   3篇
  2022年   7篇
  2021年   11篇
  2020年   5篇
  2019年   5篇
  2018年   11篇
  2017年   14篇
  2016年   14篇
  2015年   17篇
  2014年   24篇
  2013年   26篇
  2012年   25篇
  2011年   20篇
  2010年   15篇
  2009年   22篇
  2008年   21篇
  2007年   18篇
  2006年   24篇
  2005年   22篇
  2004年   28篇
  2003年   23篇
  2002年   12篇
  2001年   14篇
  2000年   7篇
  1999年   9篇
  1998年   15篇
  1997年   10篇
  1996年   10篇
  1995年   4篇
  1994年   7篇
  1993年   6篇
  1992年   5篇
  1990年   7篇
  1989年   6篇
  1988年   3篇
  1987年   8篇
  1986年   4篇
  1985年   4篇
  1984年   5篇
  1983年   7篇
  1981年   3篇
  1980年   4篇
  1977年   3篇
  1976年   3篇
  1975年   2篇
  1974年   2篇
  1973年   3篇
  1971年   2篇
  1967年   2篇
  1966年   2篇
排序方式: 共有535条查询结果,搜索用时 15 毫秒
31.
Transient diabetes mellitus in early infancy   总被引:1,自引:0,他引:1  
  相似文献   
32.
Crossed testicular ectopia is characterized by the presence of both testes in one hemiscrotum. A 7-month-old boy with this condition is described and the relevant literature reviewed. Although this anomaly has been recognized for over 100 years, its etiology is not yet established. The advent of ultrasonography has allowed early diagnosis and therapy in recent years.  相似文献   
33.
34.
BACKGROUND: Information is limited regarding the effects of processes of care on cardiac surgical outcomes. Correspondingly, many recommended cardiac surgical processes of care are derived from animal experiments or clinical judgment. This report from the VA Cooperative Study in Health Services, "Processes, Structures, and Outcomes of Cardiac Surgery," focuses on the relationships between 3 process groups (preoperative evaluation, intraoperative care, and supervision by senior physicians) and a composite outcome, perioperative mortality and morbidity. METHODS: Data on 734 risk, process, and structure variables were collected prospectively on 3,988 patients who underwent coronary artery bypass grafting at 14 VA medical centers between 1992 and 1996. Data reduction was accomplished by examining data completeness and variation across sites and surgeon, using previously published data and clinical judgment. We then applied multivariable logistic regression to the 39 remaining processes of care to determine which were related to the composite outcome after adjusting for 17 patient-related risk factors and controlling for intraoperative complications. RESULTS: Our first analysis showed several measures of operative duration, the use of inotropic agents, transesophageal echo, lowest systemic temperature, and hemoconcentration/ultrafiltration, to be powerful predictors of the composite outcome. Because the use of inotropic agents and operative duration may be related to an intermediate outcome (eg, intraoperative complications), we performed a second analysis omitting these processes. The use of intraoperative transesophageal echo and hemoconcentration/ultrafiltration remained significantly associated with an increased risk of an event (odds ratios 1.60 and 1.36, respectively). CONCLUSIONS: Our results viewed in the context of past studies suggest the possibility that inotropic use, TEE, and hemoconcentration/ultrafiltration may have adverse effects on operative outcome. Further evaluation of these processes of care using observational data, as well as randomized trials when feasible, would be of interest.  相似文献   
35.
Skeletal echinococcosis is a relatively rare entity and that of the rib is exceptional. Less than 50 cases of costal echinococcosis have been reported in the literature so far. Accurate pre-operative diagnosis aids in appropriate management and helps to eradicate the disease. This also prevents the dissemination of parasite and further complications. We report a case of echinococcosis of the rib with epidural extension in a young adult who presented with paraparesis and back pain. His laboratory investigations were within normal limits. Plain radiographs of the dorsal spine, CT scan of thorax and MRI of dorsal spine were performed. The imaging features were suggestive of echinococcosis involving the rib with epidural extension. The cyst was completely resected. Histopathology of the resected specimen confirmed the diagnosis of echinococcosis.  相似文献   
36.
Leiomyomas of the renal parenchyma and of the capsule are rare. These tumours are normally small asymptomatic and often detected incidentally. Large renal leiomyomas can present with pain or as an abdominal mass, but they are rare. The imaging features of these tumours have been poorly described in the literature. A radiological distinction from other renal neoplasms is often difficult to make owing to the similarity of imaging findings. We report two patients with renal leiomyomas who presented with pain and an abdominal mass. Both patients underwent nephrectomy and histological evaluation confirmed the diagnosis of leiomyoma.  相似文献   
37.
38.
Acute abdomen is caused by a wide variety of etiologies, many of which require surgical intervention. Two boys were hospitalized for acute abdominal pain and low-grade fever. Physical examination revealed epigastric and right upper abdominal fullness, and laboratory studies showed elevated erythrocyte sedimentation rates, with normal leukocyte counts and coagulation profiles. Abdominal ultrasound and computerized tomography revealed pseudotumor in both cases. Symptomatic treatment and cefazolin were administered, and pain and fever subsided after 6 to 10 days. Pseudotumor due to omental infarction can present as acute abdomen in children. A high index of suspicion and the use of both ultrasonography and computerized tomography will help avoid unnecessary surgical intervention in such cases.  相似文献   
39.
Umbilical granuloma (UG) is the most common umbilical abnormality in neonates, causing inflammation and drainage. Most fail to epithelialize and persist for more than 2 months. The common treatment is application of a 75% silver nitrate stick, usually repeated two to three times over a number of clinic visits. Burns have been reported following spillage onto the surrounding tissues. During a 10-year period, 302 neonates were treated for UG using excision and application of absorbable hemostatic materials. Healing was uneventful in all cases, and no complications have been encountered to date. This technique is simple, safe, and inexpensive, and obviates the need for repeated outpatient visits. Accepted: 30 October 2000  相似文献   
40.
OBJECTIVE: To investigate the prevalence of G88C, G209A and any other mutation(s) in exons 3 and 4 of the alpha-synuclein gene in Indian patients with Parkinson's disease (PD). METHODS: A total of 169 PD patients comprising 18 familial, 3 juvenile, 48 early onset and 100 sporadic cases were included in this study. Genomic DNA was amplified by PCR using primers specific for Exons 3 and 4. Mutations at G88C and G209A were screened following restriction enzyme digestion of the PCR product. Direct PCR product sequencing of entire exons 3 and 4 was carried out for at least one proband each from the 10 familial cases. RESULTS: Neither G88C and G209A mutations nor any other mutation in exons 3 and 4 was found in the PD patients analysed. CONCLUSION: The G88C and G209A mutations do not seem to be the predominant genetic determinant of PD among Indians.  相似文献   
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