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   59918篇
  免费   4510篇
  国内免费   1921篇
耳鼻咽喉   490篇
儿科学   1259篇
妇产科学   2215篇
基础医学   7173篇
口腔科学   1251篇
临床医学   5004篇
内科学   6064篇
皮肤病学   837篇
神经病学   5071篇
特种医学   1715篇
外国民族医学   7篇
外科学   4615篇
综合类   8823篇
现状与发展   3篇
一般理论   6篇
预防医学   5176篇
眼科学   1767篇
药学   7490篇
  67篇
中国医学   4662篇
肿瘤学   2654篇
  2023年   820篇
  2022年   1075篇
  2021年   1974篇
  2020年   1950篇
  2019年   1933篇
  2018年   1896篇
  2017年   1882篇
  2016年   1864篇
  2015年   1765篇
  2014年   3338篇
  2013年   4288篇
  2012年   3358篇
  2011年   3746篇
  2010年   3001篇
  2009年   2738篇
  2008年   2748篇
  2007年   2747篇
  2006年   2479篇
  2005年   2241篇
  2004年   1918篇
  2003年   1930篇
  2002年   1440篇
  2001年   1394篇
  2000年   1128篇
  1999年   1049篇
  1998年   872篇
  1997年   815篇
  1996年   729篇
  1995年   886篇
  1994年   734篇
  1993年   633篇
  1992年   587篇
  1991年   547篇
  1990年   531篇
  1989年   479篇
  1988年   359篇
  1987年   314篇
  1986年   386篇
  1985年   513篇
  1984年   475篇
  1983年   315篇
  1982年   391篇
  1981年   309篇
  1980年   328篇
  1979年   240篇
  1978年   198篇
  1977年   190篇
  1976年   179篇
  1975年   120篇
  1974年   108篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.
The ability to manage patient telephone calls competently and confidently is an important skill for nurse practitioners (NPs). A curriculum intervention was implemented in a pediatric NP program to promote this skill. Thirty-nine NP students participated in a mock telephone triage experience to determine whether triage, involving student/faculty mock parent telephone calls, would increase the student’s confidence and competence. A Likert scale pre/post questionnaire surveying perceived confidence, competence, and readiness to practice revealed an increase in students’ confidence in decision making, assessing the patient, and making a diagnosis over the phone.  相似文献   
43.
目的分析小儿弱视采用多媒体训练与传统遮盖治疗的效果。方法 100例小儿弱视患儿,采用计算机随机法分为传统组和多媒体组,每组50例。传统组患儿采用传统遮盖治疗,多媒体组患儿采用多媒体训练。比较两组患儿治疗前后立体视觉情况、视力水平及治疗效果。结果多媒体组患儿治疗总有效率为94.00%(47/50),高于传统组的80.00%(40/50),差异具有统计学意义(P<0.05)。治疗后,多媒体组患儿立体视觉正常率为90.00%(45/50),高于传统组的74.00%(37/50),差异具有统计学意义(P<0.05)。治疗后,两组患儿视力水平均高于本组治疗前,且多媒体组患儿视力水平(0.93±0.12)高于传统组的(0.84±0.12),差异具有统计学意义(P<0.05)。结论小儿弱视采用多媒体训练与传统遮盖治疗的效果存在差异,多媒体训练可更好地改善患儿视力,值得推广和应用。  相似文献   
44.
《Value in health》2022,25(2):194-202
ObjectivesLifestyle interventions during pregnancy improve maternal and infant outcomes. We aimed to compare the cost-effectiveness of 4 antenatal lifestyle intervention types with standard care.MethodsA decision tree model was constructed to compare lifestyle intervention effects from a novel meta-analysis. The target population was women with singleton pregnancies and births at more than 20 weeks’ gestation. Interventions were categorized as diet, diet with physical activity, physical activity, and mixed (lacking structured diet and, or, physical activity components). The outcome of interest was cost per case prevented (gestational diabetes, hypertensive disorders in pregnancy, cesarean birth) expressed as an incremental cost-effectiveness ratio (ICER) from the Australian public healthcare perspective. Scenario analyses were included for all structured interventions combined and by adding neonatal intensive care unit costs. Costs were estimated from published data and consultations with experts and updated to 2019 values. Discounting was not applied owing to the short time horizon.ResultsPhysical activity interventions reduced adverse maternal events by 4.2% in the intervention group compared with standard care and could be cost saving. Diet and diet with physical activity interventions reduced events by 3.5% (ICER = A$4882) and 2.9% (ICER = A$2020), respectively. Mixed interventions did not reduce events and were dominated by standard care. In scenario analysis, all structured interventions combined and all interventions when including neonatal intensive care unit costs (except mixed) may be cost saving. Probabilistic sensitivity analysis showed that for physical activity and all structured interventions combined, the probability of being cost saving was 58% and 41%, respectively.ConclusionsGovernments can expect a good return on investment and cost savings when implementing effective lifestyle interventions population-wide.  相似文献   
45.
ObjectivesThis document presents the fundamentals of speech audiometry in noise, general requirements for implementation and criteria for choice among the tests available in French according to the health-professional's needs.Material and methodsThe recommendations are based on a systematic analysis of the literature carried out by a multidisciplinary group of doctors, audiologists and audioprosthetists from all over France. They are graded A, B, C or expert opinion according to decreasing level of scientific evidence.ResultsEight tests of speech audiometry in noise can be used in France.ConclusionTo be complete, evaluation of hearing status requires testing understanding of speech in noise. The examination must begin with a minimum of two measurements familiarizing the subject with the test procedure. For initial diagnosis, adaptive procedures establishing the 50% speech reception threshold (SRT50) in noise are to be preferred in order to obtain a rapid and standardized measurement of perception of speech in noise. When the aim is to measure real-life speech comprehension, tests based on sentences, cocktail-party noise and free-field stimulation are to be preferred. Prosthetic gain is evaluated exclusively in free field. This is the only way to evaluate the contribution of binaurality and to measure perception in noise in an environment as close as possible to real life. In order to avoid acoustic interference in free field, at least five loudspeakers should be used, in particular for evaluating the effectiveness of directional microphones, CROS devices enabling sounds picked up in the damaged ear to be rerouted to the functional ear, or bimodal fitting (i.e., when hearing is enabled by two modalities: for example, hearing aid for one ear, cochlear implant for the other).  相似文献   
46.
BackgroundCoronary artery bypass grafting (CABG) improves survival in patients with heart failure and severely reduced left ventricular systolic function (LVEF). Limited data exist regarding adverse cardiovascular event rates after CABG in patients with heart failure with midrange ejection fraction (HFmrEF; LVEF > 40% and < 55%).MethodsWe analyzed data on isolated CABG patients from the Veterans Affairs national database (2010-2019). We stratified patients into control (normal LVEF and no heart failure), HFmrEF, and heart failure with reduced LVEF (HFrEF) groups. We compared all-cause mortality and heart failure hospitalization rates between groups with a Cox model and recurrent events analysis, respectively.ResultsIn 6533 veterans, HFmrEF and HFrEF was present in 1715 (26.3%) and 566 (8.6%) respectively; the control group had 4252 (65.1%) patients. HFrEF patients were more likely to have diabetes mellitus (59%), insulin therapy (36%), and previous myocardial infarction (31%). Anemia was more prevalent in patients with HFrEF (49%) as was a lower serum albumin (mean, 3.6 mg/dL). Compared with the control group, a higher risk of death was observed in the HFmrEF (hazard ratio [HR], 1.3 [1.2-1.5)] and HFrEF (HR, 1.5 [1.2-1.7]) groups. HFmrEF patients had the higher risk of myocardial infarction (subdistribution HR, 1.2 [1-1.6]; P = .04). Risk of heart failure hospitalization was higher in patients with HFmrEF (HR, 4.1 [3.5-4.7]) and patients with HFrEF (HR, 7.2 [6.2-8.5]).ConclusionsHeart failure with midrange ejection fraction negatively affects survival after CABG. These patients also experience higher rates myocardial infarction and heart failure hospitalization.  相似文献   
47.
邵奇敏  刘虹 《全科护理》2022,20(4):530-532,535
目的:探讨园艺互动干预应用于维持性血液透析病人中的效果。方法:选择本院收治的行维持性血液透析病人157例,按照入院时间先后顺序分为对照组77例,观察组80例。对照组实施常规干预,观察组实施园艺互动干预。对比两组干预前后心理状态、应对方式、生活质量及总体幸福感变化。结果:观察组干预12周后症状自评量表(SCL-90)各维度评分低于对照组(P<0.05);观察组干预12周后积极应对评分高于对照组,消极应对评分低于对照组(P<0.05);观察组生活质量各维度评分高于对照组(P<0.05);观察组总体幸福感评分高于对照组(P<0.05)。结论:园艺互动干预应用于维持性血液透析病人可改善心理状态及应对方式,提升生活质量与总体幸福感。  相似文献   
48.
49.

Background

Mental health is a major public health priority, particularly among refugees worldwide. The United Nations Relief and Works Agency for Palestine Refugees (UNRWA) started to integrate mental health and psychosocial support (MHPSS) into its primary health-care services in Jordan in late 2017. This baseline study aimed to assess the knowledge, attitudes, practices, and perceived barriers among UNRWA health staff regarding the implementation of the MHPSS programme.

Methods

The UNRWA Health Programme conducted a cross-sectional study of a sample of 220 out of the 390 male and female doctors, dentists, nurses, and midwives who work at 16 of the 25 UNRWA health centres in Jordan during November, 2017. Individuals on duty at the health centres on the day of the survey were included. The 16 health centres were selected based on their size and accessibility to surveyors (reflecting proximity to Amman, and the size of population served). Of the selected health centres, seven were large, seven were medium, and two were small according to the UNRWA classification of health centres (based on the number of medical doctors). A validated self-administered questionnaire was used. Ethics approval was granted by the UNRWA Health Programme ethics committee, and informed written consent was obtained from all participants. Data analysis was performed using SPSS (version 22).

Findings

Of the participants, 73% (161 of 220) believed that their knowledge of MHPSS programmes was insufficient, with no significant difference (p=0·116) between different categories of staff. Furthermore, 88% (194 of 220) said that they needed more training, 67% (147 of 220) reported that the number of mental health cases is increasing, and 50% (110 of 220) that dealing with these cases is difficult. Reflecting on the past 12 months, 31% of staff (69 out of 220) reported meeting between one and ten children, and 45% (100 out of 220) reported meeting between one and ten adults suspected of having mental illnesses. The most suspected condition was depression (84%; 150 of 220), followed by epilepsy (64%; 140 of 220). The main perceived barriers to implementation included the limited availability of MHPSS policies (87%; 192 of 220), MH professionals (86%; 190 of 220), resources (86%; 189 out of 220), and lack of privacy (14%; 31 out of 220).

Interpretation

Most health staff had positive attitudes towards MHPSS programme implementation but felt they lacked the required knowledge. There is a need for training and clear technical guidelines. Perceived barriers to MHPSS programme implementation need to be tackled with a structured plan of action.

Funding

The UNRWA Health Programme, UNRWA Headquarters, Amman, Jordan.  相似文献   
50.
目的评价不同手术方式治疗慢性肛裂的效果。 方法通过计算机检索传统肛裂切除术、纵切横缝法、改良纵切横缝术、肛裂切除术+外括约肌切开术、肛裂切除术+内括约肌切开术5种手术治疗慢性肛裂的国内外临床研究,采用Stata13及GeMTC软件对其治愈率和并发症发生率进行传统Meta分析和网状Meta分析。 结果共纳入21项临床研究2 430例患者。网状Meta分析显示肛裂切除术+内括约肌切开术和肛裂切除术+外括约肌切开术的治愈率均高于传统肛裂切除术,OR值分别为2.27(95%CI=1.14~4.36)、3.26(95%CI=1.67~6.75)。在并发症的发生率方面,纵切横缝术、传统肛裂切除术排前两位,肛裂切除术+内括约肌切开术最低。 结论在5种常见的慢性肛裂手术方式中,肛裂切除术+内括约肌切开术的疗效和并发症发生均优于传统肛裂切除术、纵切横缝法、改良纵切横缝术、肛裂切除术+外括约肌切开术。  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