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   19493篇
  免费   1697篇
  国内免费   517篇
耳鼻咽喉   1032篇
儿科学   208篇
妇产科学   333篇
基础医学   1621篇
口腔科学   539篇
临床医学   2029篇
内科学   2762篇
皮肤病学   316篇
神经病学   327篇
特种医学   870篇
外国民族医学   14篇
外科学   4668篇
综合类   2180篇
现状与发展   2篇
预防医学   357篇
眼科学   58篇
药学   630篇
  8篇
中国医学   232篇
肿瘤学   3521篇
  2024年   20篇
  2023年   429篇
  2022年   581篇
  2021年   940篇
  2020年   925篇
  2019年   970篇
  2018年   914篇
  2017年   779篇
  2016年   816篇
  2015年   755篇
  2014年   1497篇
  2013年   1218篇
  2012年   1111篇
  2011年   1312篇
  2010年   953篇
  2009年   947篇
  2008年   1010篇
  2007年   998篇
  2006年   844篇
  2005年   700篇
  2004年   609篇
  2003年   516篇
  2002年   415篇
  2001年   327篇
  2000年   264篇
  1999年   239篇
  1998年   194篇
  1997年   143篇
  1996年   112篇
  1995年   114篇
  1994年   143篇
  1993年   105篇
  1992年   101篇
  1991年   117篇
  1990年   50篇
  1989年   55篇
  1988年   50篇
  1987年   57篇
  1986年   37篇
  1985年   46篇
  1984年   55篇
  1983年   39篇
  1982年   42篇
  1981年   29篇
  1980年   30篇
  1979年   29篇
  1978年   18篇
  1977年   23篇
  1976年   16篇
  1975年   4篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
《Revista portuguesa de cardiologia》2020,39(6):351.e1-351.e4
The authors describe a case of a patient admitted with a pre‐syncopal episode and precordial discomfort, and whose cardiac ultrasound performed in the Emergency Room was suggestive of Pulmonary Embolism. The patient was submitted to fibrinolytic therapy after cardiac arrest. The computerized tomography done after this episode not only confirmed the presence of pulmonary embolism but had also shown a Stanford Type B Aortic Dissection. The option was to maintain the therapeutic anticoagulation, having the patient evolved favourably.  相似文献   
102.
103.
104.
胆囊癌是胆道系统最常见的恶性肿瘤,早期诊断困难,恶性程度高,易发生转移和复发。以手术为主的综合治疗是改善胆囊癌病人生存的唯一方法,但仍存在若干争议,如T2期是否需要行肝段切除、扩大根治术是否可以延长晚期胆囊癌病人的生存时间、各期胆囊癌淋巴结清扫范围等。结合术中所见、病理学检查等判断胆囊癌的肿瘤分期,并依据分期规范切除范围和淋巴结清扫是提高R0根治切除率的关键,且扩大根治术可以改善晚期病人的预后。  相似文献   
105.
106.
Formaldehyde is the most commonly used fixative chemical for the preservation of human cadavers used for educational purposes in the United States. Formaldehyde is also a known carcinogenic agent whose exposure level is regulated by guidelines of the Occupational Safety and Health Administration. Various methods for formaldehyde neutralization exist, yet many donations programs do not take any steps to neutralize the formaldehyde in embalmed donor bodies. The effectiveness of monoethanolamine (MEA) in neutralizing formaldehyde is well documented when used as a final injection during embalming. The purpose of this study is to report the effectiveness of several post‐embalming techniques of formaldehyde neutralization. Twenty‐four donor bodies were assigned to four experimental groups of six. For the three experimental groups, the techniques tested involve delivery of a 20:1 dilution of deionized water:MEA via recannulization and gravity flow infusion, compartment injection, and alternate wetting solution containing four percent MEA. Our results indicated that spray bottle delivery was not effective in neutralization of formaldehyde compared to the control group, but that formaldehyde levels decreased when recannulization or compartment injection were used. The most effective method of formaldehyde neutralization was compartment injection of MEA solution (P < 0.01). The results of this study indicate that, in situations where MEA is not used as a final infusion during embalming, compartment injection of MEA solution is an effective method of formaldehyde neutralization. Clin. Anat. 28:449–454, 2015. © 2015 Wiley Periodicals, Inc.  相似文献   
107.
Despite the increased interest in economic evaluations, there are difficulties in applying the results of such studies in practice. Therefore, the “Research Agenda for Health Economic Evaluation” (RAHEE) project was initiated, which aimed to improve the use of health economic evidence in practice for the 10 highest burden conditions in the European Union (including low back pain [LBP] and neck pain [NP]). This was done by undertaking literature mapping and convening an Expert Panel meeting, during which the literature mapping results were discussed and evidence gaps and methodological constraints were identified. The current paper is a part of the RAHEE project and aimed to identify economic evidence gaps and methodological constraints in the LBP and NP literature, in particular.The literature mapping revealed that economic evidence was unavailable for various commonly used LBP and NP treatments (e.g., injections, traction, and discography). Even if economic evidence was available, many treatments were only evaluated in a single study or studies for the same intervention were highly heterogeneous in terms of their patient population, control condition, follow-up duration, setting, and/or economic perspective. Up until now, this has prevented economic evaluation results from being statistically pooled in the LBP and NP literature, and strong conclusions about the cost-effectiveness of LBP and NP treatments can therefore not be made. The Expert Panel identified the need for further high-quality economic evaluations, especially on surgery versus conservative care and competing treatment options for chronic LBP. Handling of uncertainty and reporting quality were considered the most important methodological challenges.  相似文献   
108.
ObjectiveExamine the interrater reliability of cervicothoracic and shoulder physical examination in patients with a primary complaint of shoulder pain.DesignSingle-group repeated-measures design for interrater reliability.SettingOrthopaedic physical therapy clinics.ParticipantsTwenty-one patients with a primary complaint of shoulder pain underwent a standardized examination by a physical therapist (PT). A PT conducted the first examination and one of two additional PTs conducted the 2nd examination.Main outcome measuresThe Cohen κ and weighted κ were used to calculate the interrater reliability of ordinal level data. Intraclass correlation coefficients model 2,1 (ICC2,1) and the 95% confidence intervals were calculated to determine the interrater reliability.ResultsThe kappa coefficients ranged from −.24 to .83 for the mobility assessment of the glenohumeral, acromioclavicular and sternoclavicular joints. The kappa coefficients ranged from −.20 to .58 for joint mobility assessment of the cervical and thoracic spine. The kappa coefficients ranged from .23 to 1.0 for special tests of the shoulder and cervical spine.ConclusionsThe present study reported the reliability of a comprehensive upper quarter physical examination for a group of patients with a primary report of shoulder pain. The reliability varied considerably for the cervical and shoulder examination and was significantly higher for the examination of muscle length and cervical range of motion.  相似文献   
109.
Sentinel lymph node biopsy (SLNB) is a widely accepted standard procedure for patients with clinically localized melanoma. Melanoma prevalence and Clark's subtype differ between Asians and Caucasians. Here, we evaluated our experience on SLNB for cutaneous melanoma in a Japanese population. SLNB was performed for patients with melanoma between July 2000 and June 2014. We retrospectively analyzed 102 patients regarding association of clinicopathological features with sentinel lymph node (SLN) status, melanoma‐specific survival (MSS) and disease‐free survival (DFS). A positive SLN was significantly associated with primary Breslow thickness. Compared with 43 patients with negative SLN, 59 patients with positive SLN had significantly shorter MSS (5‐year survival rate, 94.3% vs 63.2%; = 0.0002) and DFS (5‐year survival rate, 92.7% vs 63.4%; = 0.0004). According to our subgroup analyses, nine patients with positive non‐SLN had significantly shorter MSS compared with 32 patients with negative non‐SLN (5‐year survival rate, 32.4% vs 68.5%; = 0.0273). The survival of 51 Japanese patients with acral lentiginous melanoma (ALM) was not inferior to the survival of patients with other Clark's subtype. Breslow thickness is an important factor for both MSS and DFS, and the status of SLN is the most predictive prognostic factor in Japanese patients with clinically localized melanomas, as in case of Caucasians. Features of ALM may be different between Asians and Caucasians.  相似文献   
110.
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