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   4253篇
  免费   437篇
  国内免费   118篇
耳鼻咽喉   32篇
儿科学   119篇
妇产科学   88篇
基础医学   258篇
口腔科学   106篇
临床医学   442篇
内科学   947篇
皮肤病学   80篇
神经病学   464篇
特种医学   154篇
外科学   707篇
综合类   311篇
现状与发展   1篇
预防医学   424篇
眼科学   32篇
药学   291篇
中国医学   130篇
肿瘤学   222篇
  2024年   12篇
  2023年   114篇
  2022年   155篇
  2021年   217篇
  2020年   219篇
  2019年   232篇
  2018年   258篇
  2017年   190篇
  2016年   183篇
  2015年   176篇
  2014年   345篇
  2013年   314篇
  2012年   218篇
  2011年   274篇
  2010年   196篇
  2009年   192篇
  2008年   208篇
  2007年   167篇
  2006年   155篇
  2005年   116篇
  2004年   106篇
  2003年   100篇
  2002年   79篇
  2001年   56篇
  2000年   45篇
  1999年   55篇
  1998年   40篇
  1997年   29篇
  1996年   41篇
  1995年   34篇
  1994年   28篇
  1993年   28篇
  1992年   20篇
  1991年   23篇
  1990年   19篇
  1989年   14篇
  1988年   20篇
  1987年   8篇
  1986年   11篇
  1985年   21篇
  1984年   18篇
  1983年   9篇
  1982年   10篇
  1981年   14篇
  1980年   13篇
  1979年   2篇
  1978年   8篇
  1977年   2篇
  1976年   8篇
  1975年   5篇
排序方式: 共有4808条查询结果,搜索用时 15 毫秒
951.
BackgroundAtopic dermatitis (AD) is the most common chronic skin disease in childhood. There is no definitive test for diagnosing AD. The Hanifin-Rajka criteria (HRC) and The United Kingdom Working Party criteria (UKC) are the most used in the literature. It is aimed to evaluate the clinical efficacy of HRC and UKC in pediatric age.MethodsChildren diagnosed AD in the pediatric allergy clinic were enrolled. Patients with skin problems other than AD were involved as controls. All participants were evaluated for HRC and UKC at the time of diagnosis. Clinical diagnosis by the pediatric allergist was determined as the gold standard.Results200 children with AD and 90 controls were enrolled in the study. Median (interquartile range, IQR) age of AD patients was 13.5 (7–36) months. There was no significant difference in age and sex between groups (p = 0.11 and p = 0.34, respectively). The HRC were superior to the UKC for sensitivity, negative predictive value, kappa and accuracy rate (94% vs. 72%, 84% vs. 60%, 0.68 vs. 0.56 and 87 vs. 78, respectively). On the other hand, specificity and positive predictive value of UKC were better than those of HRC (92% vs. 71% and 95% vs. 88%, respectively).ConclusionHRC seem to be better in diagnosing AD than UKC for young children. Further studies are needed to evaluate comparableness of HRC and UKC for AD in childhood in order to generate an international consensus for clinical trials.  相似文献   
952.
953.
954.
ObjectiveSeveral recent-generation surgical tissue valves have been found to have bleeding rates exceeding rates recommended by regulatory bodies. We explored bleeding events using data from the Pericardial Surgical Aortic Valve Replacement (PERIGON) Pivotal Trial for the Avalus valve (Medtronic, Minneapolis, Minn) to examine whether this end point remains relevant for the evaluation of bioprostheses.MethodsPatients (n = 1115) underwent aortic valve replacement. Bleeding and thromboembolic event episodes in patients within 3 years postimplant were analyzed for frequency, timing, and severity, focusing on patients taking antiplatelet/anticoagulant medications at the time of the event. Clinical and hemodynamic outcomes are also reported.ResultsAt 3 years, the Kaplan-Meier cumulative probability estimate of all-cause death was 7.2% (cardiac, 3.6%; valve-related, 1.1%). The Kaplan-Meier cumulative probability estimates of all and major hemorrhage were 8.7% and 5.2%, respectively. Ninety-nine bleeding events occurred in 86 patients: most occurred >30 days postsurgery. Among the 51 late major bleeds, in 5 cases the patients were taking anticoagulant/antiplatelet medication for prophylaxis after surgical aortic valve replacement at the time of the event, whereas the remaining patients were taking medications for other reasons. Age (hazard ratio, 1.035; 95% confidence interval, 1.004-1.068), peripheral vascular disease (hazard ratio, 2.135; 95% confidence interval, 1.106-4.122), renal dysfunction (hazard ratio, 1.920; 95% confidence interval, 1.055-3.494), and antithrombotic medication use at the time of the event (hazard ratio, 1.417; 95% confidence interval, 1.048-1.915) were associated with late bleeds (major and minor).ConclusionsOverall clinical outcomes demonstrated low mortality and few complications except for major bleeding. Most bleeding events occurred >30 days after surgery and in patients taking antiplatelet and/or anticoagulation for indications other than postimplant prophylaxis.  相似文献   
955.

Introduction

The good results obtained with the implementation of ambulatory laparoscopic cholecystectomy programs have led to the expansion of the initial inclusion criteria. The main objective was to evaluate the results and the degree of satisfaction of the patients included in a program of laparoscopic cholecystectomy without admission, with expanded criteria.

Methods

Observational study of a cohort of 260 patients undergoing ambulatory laparoscopic cholecystectomy between April 2013 and March 2016 in a third level hospital. We classified the patients into 2 groups based on compliance with the initial inclusion criteria of the outpatient program. Group I (restrictive criteria) includes 164 patients, while in group ii (expanded criteria) we counted 96 patients. We compared the surgical time, the rate of failures in ambulatory surgery, rate of conversion, reinterventions and mortality and the satisfaction index.

Results

The overall success rate of ambulatory laparoscopic cholecystectomy was 92.8%. The most frequent cause of unexpected income was for medical reasons. There was no statistically significant difference between the 2 groups for total surgery time, the rate of conversion to open surgery and the number of major postoperative complications Do not demostrate differences in surgical time, nor in the number of perioperative complications (major complications 1,2%), or the number of failures in ambulatory surgery, nor the number of readmissions between both groups. There was no death. 88.5% of patients completed the survey, finding no differences between both groups in the patient satisfaction index. The overall score of the process was significantly better in group ii (P=.023).

Conclusions

Ambulatory laparoscopic cholecystectomy is a safe procedure with a good acceptance by patients with expanded criteria who were included in the surgery without admission program.  相似文献   
956.
957.
958.
PurposeTo evaluate the pathologic outcomes of hepatocellular carcinoma (HCC) treated with Yttrium-90 radiation segmentectomy using glass microspheres prior to liver transplantation and explore parameters associated with pathologic necrosis.Materials and MethodsA single-institution retrospective analysis of HCC patients who received radiation segmentectomy prior to liver transplantation from November 2016 to May 2020 was performed. Patients were included if the treatment angiosome encompassed the entire tumor and could be correlated with available gross pathology. Archived histology slides were reviewed for percentage of pathologic necrosis. Thirty-three patients with 37 tumors were evaluated. The median tumor size was 2.3 cm (range, 1–6.7 cm).ResultsAll tumors received a single treatment. The median time from radiation segmentectomy to transplantation was 206 days (range, 58–550 days). Objective response per Modified Response Evaluation Criteria in Solid Tumors (mRECIST) was 92% (complete response, 76%; partial response, 16%). A total of 68% (n = 25) of tumors demonstrated ≥99% pathologic necrosis. Complete pathologic necrosis was present in 53% and 75% of tumors treated with >190 Gy (n = 18) and >500 Gy (n = 8) single-compartment Medical Internal Radiation Dose, respectively. Complete response per mRECIST, posttreatment angiosome T1 hypointensity, dose >190 Gy, microsphere specific activity >297 Bq, and a longer time between treatment and transplant were associated with ≥99% tumor necrosis (P < .05). No posttransplant tumor recurrences occurred within a median follow-up of 604 days (range, 138–1,223 days).ConclusionsRadiation segmentectomy can serve as an ablative modality for the treatment of HCC prior to liver transplant.  相似文献   
959.
As of January 2020, clinical decision support needs to be implemented across US health systems for advanced diagnostic imaging services. This article reviews the history, importance, and hurdles of clinical decision support and discusses a few pearls and pitfalls regarding its implementation.  相似文献   
960.
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