全文获取类型
收费全文 | 67111篇 |
免费 | 3058篇 |
国内免费 | 353篇 |
专业分类
耳鼻咽喉 | 104篇 |
儿科学 | 630篇 |
妇产科学 | 324篇 |
基础医学 | 2071篇 |
口腔科学 | 242篇 |
临床医学 | 26927篇 |
内科学 | 7935篇 |
皮肤病学 | 244篇 |
神经病学 | 1856篇 |
特种医学 | 847篇 |
外国民族医学 | 3篇 |
外科学 | 1637篇 |
综合类 | 10725篇 |
预防医学 | 7873篇 |
眼科学 | 68篇 |
药学 | 5802篇 |
188篇 | |
中国医学 | 2298篇 |
肿瘤学 | 748篇 |
出版年
2025年 | 50篇 |
2024年 | 815篇 |
2023年 | 1433篇 |
2022年 | 2314篇 |
2021年 | 2942篇 |
2020年 | 3378篇 |
2019年 | 2392篇 |
2018年 | 2024篇 |
2017年 | 2214篇 |
2016年 | 2473篇 |
2015年 | 2635篇 |
2014年 | 6672篇 |
2013年 | 5755篇 |
2012年 | 6131篇 |
2011年 | 6264篇 |
2010年 | 5299篇 |
2009年 | 3565篇 |
2008年 | 2851篇 |
2007年 | 3009篇 |
2006年 | 2380篇 |
2005年 | 1631篇 |
2004年 | 1080篇 |
2003年 | 721篇 |
2002年 | 591篇 |
2001年 | 444篇 |
2000年 | 291篇 |
1999年 | 290篇 |
1998年 | 179篇 |
1997年 | 150篇 |
1996年 | 135篇 |
1995年 | 100篇 |
1994年 | 73篇 |
1993年 | 38篇 |
1992年 | 37篇 |
1991年 | 36篇 |
1990年 | 20篇 |
1989年 | 16篇 |
1988年 | 21篇 |
1987年 | 12篇 |
1986年 | 9篇 |
1985年 | 13篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1980年 | 3篇 |
1979年 | 3篇 |
1977年 | 4篇 |
1976年 | 2篇 |
1974年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Anand Dayama Nikolaos Tsilimparis Stephen Kolakowski Nathaniel M. Matolo Misty D. Humphries 《Journal of vascular surgery》2019,69(1):156-163.e1
Background
Chronic limb-threatening ischemia (CLTI), defined as ischemic rest pain or tissue loss secondary to arterial insufficiency, is caused by multilevel arterial disease with frequent, severe infrageniculate disease. The rise in CLTI is in part the result of increasing worldwide prevalence of diabetes, renal insufficiency, and advanced aging of the population. The aim of this study was to compare a bypass-first with an endovascular-first revascularization strategy in patients with CLTI due to infrageniculate arterial disease.Methods
We reviewed the American College of Surgeons National Surgical Quality Improvement Program targeted lower extremity revascularization database from 2012 to 2015 to identify patients with CLTI and isolated infrageniculate arterial disease who underwent primary infrageniculate bypass or endovascular intervention. We excluded patients with a history of ipsilateral revascularization and proximal interventions. The end points were major adverse limb event (MALE), major adverse cardiovascular event (MACE), amputation at 30 days, reintervention, patency, and mortality. Multivariable logistic regression was used to determine the association of a bypass-first or an endovascular-first intervention with outcomes.Results
There were 1355 CLTI patients undergoing first-time revascularization to the infrageniculate arteries (821 endovascular-first revascularizations and 534 bypass-first revascularizations) identified. There was no significant difference in adjusted rate of 30-day MALE in the bypass-first vs endovascular-first revascularization cohort (9% vs 11.2%; odds ratio [OR], 0.73; 95% confidence interval [CI], 0.50-1.08). However, the incidence of transtibial or proximal amputation was lower in the bypass-first cohort (4.3% vs 7.4%; OR, 0.60; CI, 0.36-0.98). Patients with bypass-first revascularization had higher wound complication rates (9.7% vs 3.7%; OR, 2.75; CI, 1.71-4.42) compared with patients in the endovascular-first cohort. Compared with the endovascular-first cohort, the incidence of 30-day MACE was significantly higher in bypass-first patients (6.9% vs 2.6%; adjusted OR, 3.88; CI, 2.18-6.88), and 30-day mortality rates were 3.23% vs 1.8% (adjusted OR, 2.77; CI, 1.26-6.11). There was no difference in 30-day untreated loss of patency, reintervention of treated arterial segment, readmissions, and reoperations between the two cohorts. In subgroup analysis after exclusion of dialysis patients, there was also no significant difference in MALE or amputation between the bypass-first and endovascular-first cohorts.Conclusions
CLTI patients with isolated infrageniculate arterial disease treated by a bypass-first approach have a significantly lower 30-day amputation. However, this benefit was not observed when dialysis patients were excluded. The bypass-first cohort had a higher incidence of MACE compared with an endovascular-first strategy. These results reaffirm the need for randomized controlled trials, such as the Bypass versus Angioplasty in Severe Ischaemia of the Leg (BASIL-2) trial and Best Endovascular vs Best Surgical Therapy in Patients with Critical Limb Ischemia (BEST-CLI), to provide level 1 evidence for the role of endovascular-first vs bypass-first revascularization strategies in the treatment of this population of challenging patients. 相似文献2.
Judith D. DePue Elizabeth L. McQuaid Daphne Koinis-Mitchell Christopher Camillo Anthony Alario Robert B. Klein 《The Journal of asthma》2007,44(6):449-453
Over 3 years, 972 families participated in an after-school asthma program at their child's school. Parents and children attended concurrent 21/2 -hour workshops. Parents were 74% Latino; 45% non-English speaking, with 77% of children on Medicaid. Asthma symptoms were significantly reduced, from multiple times per week to less than once per week on average. Oral steroid use decreased to one third of baseline use. Hospital days decreased from 11% to 2%; emergency visits decreased 35% to 4%; and school days missed decreased 48% to 20%. This program has now become sustainable with both private and Medicaid insurance coverage. 相似文献
3.
AIMS: The efficacy of three education programmes for Type 2 diabetic patients was tested in a randomized trial. A didactic-oriented training programme (treatment A) was compared with a self-management-oriented programme delivered in group sessions (treatment B). The latter programme was compared with a more individualized approach (treatment C). METHODS: One hundred and eighty-one Type 2 diabetic patients (age 55.6 +/- 6.3 years, diabetes duration 6.6 +/- 6.2 years, HbA(1c) 7.8 +/- 1.6%, female 49.7%) took part. Efficacy was assessed 3 months (t1) after baseline (t0) and at a follow-up 15 months (t2) after baseline. RESULTS: The fall in HbA(1c) in treatment B at t1 was sustained at t2 (t0 8.1 +/- 1.8%, t1 7.3 +/- 1.7%, t2 7.4 +/- 1.9%). In treatment A, HbA(1c) was unchanged throughout (t0 7.6 +/- 1.5%, t1 7.5 +/- 1.3%, t2 7.7 +/- 1.7%; treatment A vs. treatment B; P < 0.05). With the more individualized approach of treatment C, there was a fall in HbA(1c) at t1, but this was not sustained at t2 (t0 7.8 +/- 1.6%, t1 7.1 +/- 1.3%, t2 7.6 +/- 1.6%; treatment B vs. treatment C; P = 0.73). There were also significant benefits in treatment B subjects compared with treatment A in further medical (body mass index and fasting blood glucose), psychological (control, irritability and hunger dependency of eating behaviour, and trait anxiety) and behavioural (exercise) variables. There were no significant benefits of the more individualized treatment C compared with group treatment B. No significant differences were found regarding triglyceride levels, high-density lipoprotein, diabetes-related knowledge, negative well-being, urine or blood glucose levels or foot care. CONCLUSION: Self-management training had a significantly higher medium-term efficacy than didactic diabetes education. The group sessions were more effective than a more individualized approach. 相似文献
4.
REDMAN SALLY; WATKINS JULIA; EVANS LOUISE; LLOYD DEBORAH 《Health promotion international》1995,10(2):101-113
Breast feeding has nutritional, immunologic and antiallergicadvantages for the infant. Although it has been widely recommendedthat infants be exclusively breast fed until 46 monthsof age, only about half of all Australian babies currently receiveextended breast feeding. The present study evaluated an intensiveprogramme designed to increase the proportion ofprimi-parousmothers who breast fed for 4 months or longer. Women who registeredwith the hospital at least 20 weeks before delivery and whointended to breastfeed were eligible for the study. Two hundredand thirty-five women were allocated to receive either usualcare or an intensive breast feeding programme when they registeredwith the hospital. The intensive programme consisted of writtenmaterials, and group and individual sessions with a lactationcounsellor. It also included a visit from a breastfeeding consultantwhile in hospital after the birth and contact on return home.Women were followed up 6 weeks and 4 months after delivery.There were no significant differences in breastfeeding ratesbetween the control and intervention groups at either follow-uppoint. Breast feeding until 4 months was more likely among womenwhose baby did not receive a bottle feed while still in hospitaland who did not smoke, use the combined oral contraceptive pillor introduce solid food before 4 months. Those mothers who enjoyedand felt satisfied with breastfeeding were more likely to continueto 4 months. It seems likely that programmes designed to increasebreastfeeding will need to address underlying factors such ashospital policy rather than simply providing more health education. 相似文献
5.
A new radiolucent device for increased accuracy of CT-guided fine-needle punctures permits precise determination of the optimum
angle, depth, and position of the fine needle, which can be preset from the data supplied on the CT monitor. Puncture and
repeat scans for controlling the tip of the needle can be performed with the patient in a stationary position. The device
is designed as a belt that holds a needle holder sheath and a goniometric scale, both of which can be moved to varying positions
around the patient. 相似文献
6.
Bullying at School: Basic Facts and Effects of a School Based Intervention Program 总被引:10,自引:0,他引:10
《Journal of child psychology and psychiatry, and allied disciplines》1994,35(7):1171-1190
7.
8.
The Multiphasic Environmental Assessment Procedure (MEAP; Moos and Lemke, 1984) was used to assess three long-stay settings within a geriatric hospital, one of which is a non-nursing unit committed to the philosophy of residents viewing the setting as their own home. Findings suggest positive outcomes for residents on the nonnursing unit, and support the view that types of care fostering independence and personal responsibility of elderly residents in their setting may be associated with increased mental functioning and activity. The lack of trained nursing staff had no detrimental effect on any measure of resident life, and some specific caring practices on the unit may be interpreted as having a positive outcome for residents. 相似文献
9.
Lyn Wendon 《Early child development and care》1993,86(1):11-22
The originator of LETTERLAND describes a unique teaching model which blends a structured phonics approach with whole language teaching. Children are introduced to a language about language which enables them to acquire a confident mastery of print based on parallel learning. Its pictogrammatic approach creates a stimulus to inquiry and a learning environment which is imaginative and friendly. 相似文献
10.
社区精神分裂症综合式家庭干预对照研究 总被引:2,自引:0,他引:2
目的:了解综合式家庭干预对社区精神分裂症患者和家属的效果。方法:在宝山区随机抽取186例精神分裂症进行一年的综合式家庭干预对照研究,干预组86例接受综合式家庭干预和常规社区服务,对照组100例仅接受常规社区服务。结果:干预组患者年复发率下降47.3%,社区功能明显改善,干预组家庭对有关疾病知识增长,心理状况改善,照料负担减轻,与对照组比较效果显著。结论:综合式家庭干预对精神分裂症患者家属有良好的效果,应纳入常规社区服务。 相似文献