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   5529篇
  免费   322篇
  国内免费   50篇
耳鼻咽喉   51篇
儿科学   95篇
妇产科学   292篇
基础医学   591篇
口腔科学   96篇
临床医学   573篇
内科学   1205篇
皮肤病学   65篇
神经病学   438篇
特种医学   147篇
外科学   683篇
综合类   107篇
一般理论   2篇
预防医学   262篇
眼科学   310篇
药学   469篇
中国医学   34篇
肿瘤学   481篇
  2023年   19篇
  2022年   61篇
  2021年   161篇
  2020年   62篇
  2019年   123篇
  2018年   174篇
  2017年   103篇
  2016年   120篇
  2015年   172篇
  2014年   206篇
  2013年   267篇
  2012年   444篇
  2011年   402篇
  2010年   296篇
  2009年   221篇
  2008年   326篇
  2007年   337篇
  2006年   333篇
  2005年   292篇
  2004年   253篇
  2003年   211篇
  2002年   182篇
  2001年   164篇
  2000年   158篇
  1999年   131篇
  1998年   27篇
  1997年   36篇
  1996年   25篇
  1995年   23篇
  1994年   25篇
  1993年   11篇
  1992年   79篇
  1991年   55篇
  1990年   66篇
  1989年   40篇
  1988年   27篇
  1987年   39篇
  1986年   27篇
  1985年   26篇
  1984年   18篇
  1983年   9篇
  1981年   9篇
  1980年   16篇
  1979年   20篇
  1978年   16篇
  1977年   9篇
  1975年   10篇
  1973年   8篇
  1972年   12篇
  1971年   8篇
排序方式: 共有5901条查询结果,搜索用时 515 毫秒
71.
Objective: The symptoms of depression experienced by women during the postnatal period may have profound effects on the lifelong health of both the mother and the child. In this randomized controlled study, we systematically evaluated the effects of weekly supportive group meetings for women with postnatal distress. Methods: Sixty postnatally distressed women were randomly assigned to support (n=30) and control (n=30) groups. Women assigned to the support group participated in four supportive group sessions that comprised discussions concerning transition to motherhood, postnatal stress management, communication skills, and life planning. Results: Subjects who attended the support sessions had significantly decreased scores on the Beck Depression Inventory (BDI) and the Perceived Stress Scale (PSS), and significantly increased scores on the Interpersonal Support Evaluation List (ISEL) as evaluated at the end of the fourth weekly session. In contrast, no significant changes were observed in the control group during this period. Conclusion: This is the first controlled study to provide evidence that participation in support groups for postnatally distressed women provides quantifiable psychosocial benefits.  相似文献   
72.
Cerebral amyloid angiopathy frequently causes recurrent intracerebral hemorrhages in elderly patients who do not have systemic hypertension. Surgery should be reserved for conditions which cannot be controlled by medical treatment. When surgery is needed, potential complications (such as bleeding near the operation site or remote area) should be kept in mind. A case study of a 66-year-old woman with cerebral amyloid angiopathy and recurrent intracerebral hemorrhages is presented.  相似文献   
73.
74.
75.
76.
A 63-year-old men suffered from fever, jaundice, and right upper quadrant pain for 1 week. Biliary stones with biliary tract infection were diagnosed. He was treated with parenteral antibiotics. However, abdominal ultrasonography showed multiple hyperechoic lesions in both lobes, and infiltrating hepatocellular carcinoma was suspected initially. Numerous hypervascular nodular-enhancing lesions were revealed by computed tomography. Magnetic resonance imaging further disclosed numerous tiny cystic lesions with peripheral enhancement. Exploratory laparotomy was performed for biliary calculi and probable underlying malignancy. Cholecystectomy, choledocholithotomy, and liver wedge biopsy were done. The pathology revealed bile duct hamartomas with microabscess formation. The past literature about biliary hamartomas is reviewed.  相似文献   
77.
BACKGROUND: To determine the factors predictive of mortality in patients with unstable pelvic fractures after successful transcatheter arterial embolization. METHODS: A retrospective study of pelvic fractures between May of 1995 and April of 1998 was performed. Of 507 patients, 17 who were unstable underwent embolization. The success rate of embolization and the mortality rate after successful embolization were reviewed. Predictive factors (contrast medium extravasation, initial blood pressure, Injury Severity Score, timing of external fixation, time to angiography, volume of blood transfusion, rate of blood transfusion) of the final outcome were statistically analyzed. RESULTS: Embolization was 100% effective in stopping pelvic hemorrhage. The mortality of patients treated successfully with embolization was 17.6%. Among the predictive factors analyzed, only the rate of blood transfusion before embolization, 11.3 +/- 11.0 units/h (death) versus 3.2 +/- 1.9 units/h (survival) showed statistical significance with an odds ratio of 1.62 (95% confidence interval, 1.07-2.46). CONCLUSION: The success rate of embolization was 100% in stopping arterial hemorrhage of unstable pelvic fractures. The survival rate after successful embolization was 82.4%. Patients who had rapid blood transfusion before embolization had a poor final outcome. The risk of dying increased by 62% for every 1 unit/h increase of transfusion rate.  相似文献   
78.
Applications of 24-hour noninvasive ambulatory blood pressure monitoring.   总被引:1,自引:0,他引:1  
Yung-Zu Tseng 《台湾医志》2006,105(12):955-963
Casual blood pressure (CBP) measurements using a standard sphygmomanometer have traditionally constituted the principal modality for the assessment and management of hypertension. However, CBP measurement has shortcomings. Ambulatory blood pressure monitoring (ABPM) provides abundant information on blood pressure (BP), including heart rate, all BP readings for test periods, BP average, BP variability, BP load, load index, distribution pattern of BP, reduction percentage of BP, trough/peak ratio, and summary statistics for overall 24-hour, daytime and nighttime periods. Over the last three decades, ABPM has evolved from a research device to an established and valuable clinical tool for assessment and management of hypertension. This technology has been proven to be useful in terms of the distribution pattern of BP, characterization of BP profiles in normotensive and hypertensive patients, evaluation of patients with mild or labile hypertension, physiologic and psychologic factors for fluctuation of BP, load index study, study of white coat hypertension, etiology of hypertension, prognosis of hypertension, and assessment of antihypertensive management. Nevertheless, the technology remains underused due to lack of insurance reimbursement in most countries. Accordingly, insurance reimbursement is crucial to promote increased utility of ABPM. Clinicians should be familiar with the role of this technology in the care of patients with abnormal BP. This review is an attempt to increase clinicians' understanding of ABPM and the appropriate use of this technology.  相似文献   
79.
PURPOSE: This multicenter, open-label, phase I/IIa study was undertaken to establish the safety/toxicity profile of cetuximab in combination with gemcitabine and carboplatin in patients with chemotherapy-na?ve, epidermal growth factor receptor-positive, stage IV non-small-cell lung cancer. Secondary objectives were to gather preliminary evidence of efficacy including tumor response rate, time to progression, and overall survival. PATIENTS AND METHODS: Thirty-five patients received a total of 264 3-week cycles of treatment with cetuximab, carboplatin, and gemcitabine. An initial dose of cetuximab 400 mg/m2 intravenously was administered the first week, followed by weekly doses of 250 mg/m2. Carboplatin (area under the curve = 5, day 1) and gemcitabine 1,000 mg/m2 on days 1 and 8 were administered every 3 weeks. Patients were evaluated for tumor response after every two cycles of therapy. RESULTS: The most frequently reported adverse events related to cetuximab included an acne-like rash (88.6%), dry skin (34.3%), asthenia and skin disorders (31.4%), mucositis/stomatitis (25.7%), fever/chills (20%), and nausea/vomiting (17.1%). The majority of these toxicities were mild to moderate. One patient withdrew from the study because of a grade 3 allergic reaction. Myelosuppression was the most frequently observed toxicity related to chemotherapy. Responses among 35 assessable patients included 10 partial responses (28.6%). Twenty-one patients had stable disease. The median time to progression was 165 days, and the median overall survival was 310 days. CONCLUSION: The combination of cetuximab, carboplatin, and gemcitabine was well tolerated with an acceptable toxicity profile. Most grade 3 adverse events were attributable to chemotherapy. The response rate and median survival are encouraging and warrant additional investigation.  相似文献   
80.
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