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   841篇
  免费   37篇
  国内免费   1篇
耳鼻咽喉   9篇
儿科学   9篇
妇产科学   4篇
基础医学   130篇
口腔科学   8篇
临床医学   51篇
内科学   274篇
皮肤病学   12篇
神经病学   46篇
特种医学   86篇
外科学   124篇
综合类   8篇
预防医学   27篇
眼科学   2篇
药学   57篇
肿瘤学   32篇
  2022年   5篇
  2021年   11篇
  2020年   6篇
  2018年   13篇
  2017年   8篇
  2016年   12篇
  2015年   13篇
  2014年   9篇
  2013年   17篇
  2012年   38篇
  2011年   39篇
  2010年   13篇
  2009年   23篇
  2008年   19篇
  2007年   38篇
  2006年   37篇
  2005年   28篇
  2004年   34篇
  2003年   41篇
  2002年   34篇
  2001年   21篇
  2000年   26篇
  1999年   47篇
  1998年   7篇
  1997年   12篇
  1996年   17篇
  1995年   8篇
  1994年   5篇
  1992年   15篇
  1991年   16篇
  1990年   11篇
  1989年   12篇
  1988年   11篇
  1987年   8篇
  1986年   12篇
  1985年   14篇
  1984年   9篇
  1983年   8篇
  1982年   5篇
  1979年   15篇
  1977年   11篇
  1975年   10篇
  1974年   10篇
  1973年   17篇
  1972年   6篇
  1971年   9篇
  1970年   5篇
  1934年   5篇
  1930年   5篇
  1928年   5篇
排序方式: 共有879条查询结果,搜索用时 11 毫秒
61.
62.
63.
64.
Isolated Langerhans cell histiocytosis (LCH) of the female genital tract is very rare. A review of the literature revealed that only 15 cases of primary vulvar LCH have previously been published in the English literature. We describe an additional case of confined vulvar LCH. A 49-year-old woman presented with an ulcerous lesion that turned out to be LCH confined to the vulva only. After surgical excision, four recurrences followed, which were treated again by surgery. After the fourth recurrence, adjuvant radiotherapy was applied. When the fifth recurrence occurred, only surgical excision was performed, and the patient has now been disease-free for 51 months. There are no standard treatment options for this rare disease. The most effective treatment options still remain elusive. In our case in the end surgery proved to be effective.  相似文献   
65.
OBJECTIVE: To compare etanercept-induced improvement in disability of patients with recent onset of rheumatoid arthritis (RA) to that of patients with established RA. METHODS: Health Assessment Questionnaire (HAQ) scores were collected over 3 years in 2 groups of patients with RA who were treated with etanercept. The first group consisted of 207 patients with recent onset RA (mean duration of 1 year) who had not previously received methotrexate, and the second group consisted of 464 patients with established RA (mean duration of 12 years) who had failed one or more disease-modifying antirheumatic drugs. RESULTS: Baseline demographics and disease characteristics were similar in the 2 groups, except for HAQ scores and C-reactive protein levels, which were higher in the established RA group. Patients in both groups showed rapid and sustained clinical responses with etanercept therapy, but patients with recent onset RA showed significantly greater improvement in HAQ scores compared with patients with established RA. The difference in magnitude of HAQ score improvement between groups was observed as early as week 2 after initiation of etanercept and persisted throughout the 3-year time frame. At year 3, significantly more patients with recent onset RA had a HAQ score of zero (26%) versus those with established RA (14%, p = 0.0095). CONCLUSION: Although etanercept therapy significantly improved disability scores in both groups, patients with recent onset of RA showed greater benefit in HAQ scores than patients with established RA. These results support prompt treatment of RA at an early stage of disease to minimize patient disability.  相似文献   
66.
Recent advances in the understanding of the pathophysiology, aggressive treatment, and early detection of rheumatoid arthritis (RA) have changed the clinical, pathologic, and functional outcomes in patients with RA. Early aggressive treatment of RA has now become the norm in clinical practice rather than the use of the traditional pyramid approach of the last half of the twentieth century. Early treatment with monotherapy of traditional disease-modifying antirheumatic drugs (DMARDs) or biologics, combination traditional DMARD therapy and, especially, combination of biologic therapy and methotrexate, have revolutionized the treatment of RA, producing significant improvement in clinical, radiographic, and functional outcomes not seen previously. For the individual patient, we still cannot determine which medication or combination of medications will give the most complete response. There have been a number of recent, well-designed clinical trials that have tried to answer this question. Herein we review the evidence-based medicine that addresses these issues.  相似文献   
67.
A myocardial infarction is a rare complication of a pheochromocytoma. A pheochromo-cytoma crisis may occur spontaneously, during pregnancy, or may be induced by a local trauma of the tumor or by drugs. We present a case report of a 41-year-old woman without anamnestic episodes of hypertension or angina pectoris. During angiography of the mesenteric arteries for further diagnostics of a sonographically suspected liver tumor, she developed an acute pulmonary edema and a cardiogenic shock with the electro- and echocardiographic findings of a large anterolateral-apical-diaphragmal myocardial infarction. The immediate coronary angiography 90 min after the onset of the myocardial infarction showed normal coronary arteries with normal coronary blood flow of the arteries supplying myocardial areas with akinetic segments and those arteries supplying hyperkinetic segments. The blood catecholamine levels at this time were excessively elevated. The left ventricular function improved to almost normal within the next 4 weeks with the beginning of the improvement already before the abdominal tumor was surgically removed at day five. The histology documented a pheochromocytoma with acute necrosis. The early invasive findings support the hypothesis that a reversible spasm of several epicardial arteries and not a direct toxic effect of catecholamines could have been the cause of the small myocardial infarction and the observed large myocardial stunning.  相似文献   
68.
OBJECTIVE: Approximately 3% of the US population over the age of 65 years has rheumatoid arthritis (RA). We compared the safety and efficacy of etanercept (Enbrel) in patients with RA who were > or = 65 years to those < 65 years in open-label and double-blind, randomized clinical trials. METHODS: Patients from 4 double-blind, randomized controlled trials and 5 open-label trials were included in this retrospective analysis. Patients were grouped by age (< 65 or > or = 65 yrs) at time of study entry. All patients received etanercept subcutaneously twice weekly. Improvement in signs and symptoms was assessed by the proportion of patients who achieved the American College of Rheumatology definition of improvement (ACR 20). The ACR 50 and ACR 70 responses were calculated in an analogous fashion. Safety was assessed at regularly scheduled visits. RESULTS: Of 1128 patients enrolled in etanercept trials, 197 (17%) were > or = 65 years of age. Clinical response was rapid and sustained and did not differ between age groups. At one year, 69% of patients < 65 years and 66% of patients > or = 65 years met the ACR 20. Forty percent of the patients > or = 65 years met the ACR 50 and 17% met the ACR 70. Etanercept was well tolerated. Although injection site reactions, headache, and rhinitis occurred somewhat more frequently in younger patients, the overall rates and types of other adverse events were comparable in both groups. CONCLUSION: Etanercept is a new treatment option for older patients with RA and has substantial benefit and comparable safety regardless of patient age.  相似文献   
69.
70.
OBJECTIVE: To examine the efficacy and safety of different rituximab doses plus methotrexate (MTX), with or without glucocorticoids, in patients with active rheumatoid arthritis (RA) resistant to disease-modifying antirheumatic drugs (DMARDs), including biologic agents. METHODS: A total of 465 patients were randomized into 9 treatment groups: 3 rituximab groups (placebo [n = 149], 500 mg [n = 124], or 1,000 mg [n = 192] on days 1 and 15) each also taking either placebo glucocorticoids, intravenous methylprednisolone premedication, or intravenous methylprednisolone premedication plus oral prednisone for 2 weeks. All patients received MTX (10-25 mg/week); no other DMARDs were permitted. RESULTS: Significantly more patients who received 2 500-mg or 2 1,000-mg infusions of rituximab met the American College of Rheumatology 20% improvement criteria (achieved an ACR20 response) at week 24 (55% and 54%, respectively) compared with placebo (28%; P < 0.0001). ACR50 responses were achieved by 33%, 34%, and 13% of patients, respectively (P < 0.001), and ACR70 responses were achieved by 13%, 20%, and 5% of patients (P < 0.05). Changes in the Disease Activity Score in 28 joints (-1.79, -2.05, -0.67; P < 0.0001) and moderate to good responses on the European League Against Rheumatism criteria (P < 0.0001) reflected the ACR criteria responses. Glucocorticoids did not contribute significantly to the primary efficacy end point, ACR20 response at 24 weeks. Intravenous glucocorticoid premedication reduced the frequency and intensity of first infusion-associated events; oral glucocorticoids conferred no additional safety benefit. Rituximab was well tolerated; the type and severity of infections was similar to those for placebo. CONCLUSION: Both rituximab doses were effective and well tolerated when added to MTX therapy in patients with active RA. The primary end point (ACR20 response) was independent of glucocorticoids, although intravenous glucocorticoid premedication improved tolerability during the first rituximab infusion.  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