全文获取类型
收费全文 | 20131篇 |
免费 | 1650篇 |
国内免费 | 596篇 |
专业分类
耳鼻咽喉 | 191篇 |
儿科学 | 309篇 |
妇产科学 | 569篇 |
基础医学 | 2583篇 |
口腔科学 | 418篇 |
临床医学 | 2218篇 |
内科学 | 4123篇 |
皮肤病学 | 241篇 |
神经病学 | 1210篇 |
特种医学 | 488篇 |
外国民族医学 | 4篇 |
外科学 | 2760篇 |
综合类 | 1601篇 |
现状与发展 | 4篇 |
一般理论 | 5篇 |
预防医学 | 1150篇 |
眼科学 | 750篇 |
药学 | 1655篇 |
6篇 | |
中国医学 | 633篇 |
肿瘤学 | 1459篇 |
出版年
2024年 | 48篇 |
2023年 | 259篇 |
2022年 | 508篇 |
2021年 | 765篇 |
2020年 | 503篇 |
2019年 | 523篇 |
2018年 | 597篇 |
2017年 | 538篇 |
2016年 | 527篇 |
2015年 | 704篇 |
2014年 | 864篇 |
2013年 | 970篇 |
2012年 | 1428篇 |
2011年 | 1525篇 |
2010年 | 911篇 |
2009年 | 738篇 |
2008年 | 1103篇 |
2007年 | 1117篇 |
2006年 | 1155篇 |
2005年 | 1128篇 |
2004年 | 933篇 |
2003年 | 793篇 |
2002年 | 788篇 |
2001年 | 559篇 |
2000年 | 546篇 |
1999年 | 491篇 |
1998年 | 196篇 |
1997年 | 208篇 |
1996年 | 165篇 |
1995年 | 114篇 |
1994年 | 112篇 |
1993年 | 78篇 |
1992年 | 208篇 |
1991年 | 190篇 |
1990年 | 168篇 |
1989年 | 146篇 |
1988年 | 117篇 |
1987年 | 113篇 |
1986年 | 91篇 |
1985年 | 62篇 |
1984年 | 43篇 |
1983年 | 31篇 |
1982年 | 45篇 |
1981年 | 39篇 |
1980年 | 35篇 |
1979年 | 36篇 |
1978年 | 32篇 |
1977年 | 19篇 |
1975年 | 20篇 |
1973年 | 14篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Purpose
We reviewed the indications, safety, and efficacy of photodynamic therapy with verteporfin in various macular diseases and vasculopathies, which are common in Asian populations, and compared the outcomes of photodynamic therapy in Asian patients with the outcomes in Caucasian patients.Methods
Relevant clinical and laboratory original articles, case reports, and review articles that have been published in the literature between January 1999 and October 2004 were searched in Medline. The potential differences in the response to photodynamic therapy between Asian and Caucasian patients were evaluated. Articles in foreign languages with English abstracts were included.Results
Macular diseases commonly seen in Asian populations, including choroidal neovascularization (CNV) of age-related macular degeneration, secondary to pathologic myopia or from an idiopathic cause, and choroidal vasculopathies such as central serous chorioretinopathy and polypoidal choroidal vasculopathy were included in the review. The results were tabulated and the differences with Caucasian populations were compared and highlighted.Conclusion
Photodynamic therapy has been found to be an effective and noninvasive treatment for various subfoveal CNV and choroidal vasculopathies of the macula. Diverse behavior in different ethnic groups is observed. Jpn J Ophthalmol 2006;50:161–169 © Japanese Ophthalmological Society 2006 相似文献102.
生脉注射液具有益气养阴、复脉固脱之功效,广泛用于严重感染、血容量不足引起的血压降低.在气管插管后血压降低时,应用生脉注射液也取得了较好的临床疗效.本文对气管插管后血压降低应用生脉注射液的用法用量、注意事项等进行了归纳. 相似文献
103.
104.
105.
Yuehan Chen Xu Zhang Xiansheng Zeng Tingting Xu Wei Xiao Xuejiao Yang Wenzhi Zhan Chen Zhan Kefang Lai 《Journal of thoracic disease》2022,14(6):2079
BackgroundCough is one of the most common symptoms of coronavirus disease 2019 (COVID-19). However, the prevalence of persistent cough in recovered patients with COVID-19 during a longer follow-up remained unknown. This study aims to investigate the prevalence, and risk factors for postinfectious cough in COVID-19 patients after discharge.MethodsWe conducted a follow-up study for 129 discharged patients with laboratory-confirmed COVID-19 in two large hospitals located in Hubei Province, China from January 2020 to December 2020. Baseline demographics, comorbidities and smoking history were extracted from the medical record. Current symptoms and severity were recorded by a uniform questionnaire. Spirometry, diffuse function and chest computed tomography (CT) were performed on part of patients who were able to return to the outpatient department at follow-up.ResultsThe median (interquartile range) follow-up time was 8.1 (7.9–8.5) months after discharge. The mean (standard deviation) age was 51.5 (14.9) years and 57 (44.2%) were male. A total of 27 (20.9%) patients had postinfectious cough (>3 weeks), 6 patients (4.7%) had persistent cough by the end of follow-up, including 3 patients with previous chronic respiratory diseases or current smoking. Other symptoms included dyspnea (6, 4.7%), sputum (4, 3.1%), fatigue (4, 3.1%), and anorexia (4, 3.1%) by the end of follow-up. Thirty-six of 41 (87.8%) patients showed impaired lung function or diffuse function, and 39 of 50 (78.0%) patients showed abnormal CT imaging. Patients with postinfectious cough demonstrated more severe and more frequent cough during hospitalization (P<0.001), and more chronic respiratory diseases (P=0.01). In multivariate logistic regression analysis, digestive symptoms during hospitalization [odds ratio (OR) 2.95, 95% confidence interval (CI): 1.10–7.92] and current smoking (OR 6.95, 95% CI: 1.46–33.14) were significantly associated with postinfectious cough of COVID-19.ConclusionsA small part of patients developed postinfectious cough after recovery from COVID-19, few patients developed chronic cough in spite of a higher proportion of impaired lung function and abnormal lung CT image. Current smoking and digestive symptoms during hospitalization were risk factors for postinfectious cough in COVID-19. 相似文献
106.
Shao-Huan Lan Chih-Cheng Lai Shen-Peng Chang Li-Chin Lu Shun-Hsing Hung Wei-Ting Lin 《Medicine》2022,101(27)
Background:The aim of this study was to investigate the clinical effect and safety of accelerated-strategy initiation of renal replacement therapy (RRT) in critically ill patients.Methods:PubMed, Embase, OVID, EBSCO, and the Cochrane Library databases were searched for relevant articles from inception to December 30, 2020. Only RCTs that compared the clinical efficacy and safety between accelerated-strategy RRT and standard-strategy RRT among critically ill adult patients with acute kidney injury (AKI) were included. The primary outcome was 28-day mortality.Results:A total of 5279 patients in 12 RCTs were included in this meta-analysis. The 28-day mortality rates of patients treated with accelerated and standard RRT were 37.3% (969/2596) and 37.9% (976/2573), respectively. No significant difference was observed between the groups (OR, 0.92; 95% CI, 0.70–1.12; I2 = 60%). The recovery rates of renal function were 54.5% and 52.5% in the accelerated- and standard-RRT groups, respectively, with no significant difference (OR, 1.03; 95% CI, 0.89–1.19; I2 = 56%). The rate of RRT dependency was similar in the accelerated- and standard-RRT strategies (6.7% vs 5.0%; OR, 1.11; 95% CI, 0.71–1.72; I2 = 20%). The accelerated-RRT group displayed higher risks of hypotension, catheter-related infection, and hypophosphatemia than the standard-RRT group (hypotension: OR, 1.26; 95% CI, 1.10–1.45; I2 = 36%; catheter-related infection: OR, 1.90; 95% CI, 1.17–3.09; I2 = 0%; hypophosphatemia: OR, 2.11; 95% CI, 1.43–3.15; I2 = 67%).Conclusions:Accelerated RRT does not reduce the risk of death and does not improve the recovery of kidney function among critically ill patients with AKI. In contrast, an increased risk of adverse events was observed in patients receiving accelerated RRT. However, these findings were based on low quality of evidence. Further large-scale RCTs is warranted. 相似文献
107.
PurposeSarcopenia is a major health problem in community-dwelling elderly individuals. Hypertension is postulated to aggravate sarcopenia. The present study was performed to estimate the prevalence of and factors associated with sarcopenia among elderly individuals with hypertension.MethodsThis study involved 165 Chinese individuals with hypertension aged ≥60 years who were evaluated for sarcopenia using the Asian Working Group for Sarcopenia criteria. Data on their sociodemographic information, physical illnesses, and clinical and functional status were collected.ResultsThe overall prevalence of sarcopenia among elderly individuals with hypertension was 20.2%. The factors significantly associated with sarcopenia were an age of ≥70 years (adjusted odds ratio (OR), 3.01; 95% confidence interval (CI), 1.17–5.39), diabetes (OR, 4.45; 95% CI, 1.32–11.16), osteoporosis (OR, 2.52; 95% CI, 1.13–5.37), drinking (OR, 3.28; 95% CI, 1.26–7.85), and a body mass index of 24.0 to 27.9 kg/m2 (OR, 0.74; 95% CI, 0.59–0.91).ConclusionsThis study revealed a very high prevalence of sarcopenia among elderly individuals with hypertension (20.2%). Sarcopenia may be associated with advanced age, drinking, diabetes, the body mass index, and osteoporosis. The longitudinal relationship between clinic visits and sarcopenia should be further evaluated. 相似文献
108.
耳蜗电图在梅尼埃病诊断中的价值 总被引:4,自引:0,他引:4
迄今尚缺乏诊断梅尼埃病的敏感且特异的客观试验,70年代以来,若干研究探讨了耳蜗电图(Electrocochleogram,ECochG)在梅尼埃病诊断中的价值,认为典型的改变是-SP异常增大,导致-SP/AP比值增高,以及-SP-AP复合波形异常增宽。各家报告-SP/AP诊断梅尼埃病阳性率从32%至87%.本文报告了97例100耳梅尼埃病鼓室内法检测的耳蜗电图结果,49例-SP/AP比值异常增高,阳性率49%;波型异常增宽17耳,总阳性率66%.眼震电图检测的阳性率61%.耳蜗电图和眼震电图改变一致的43耳,二者总阳性率为84%。对各家阳性率不一致的原因作了分析。认为耳蜗电图-SP/AP比值诊断梅尼埃病的敏感性不如文献报告的那么乐观,在目前尚无更敏感更特异的诊断手段的情况下,耳蜗电图和眼震电图在梅尼埃病的诊断中起着相互印证和相互补充的作用。 相似文献
109.
110.
目的 探讨血管腔内微波消融(EMA)与射频消融(RFA)闭合大隐静脉主干的疗效和安全性差异。方法 收集2019年1—6月浙江省人民医院收治的316例大隐静脉功能不全患者的临床资料,并按照性别、年龄、病程、体重指数、身高、基础临床表现-病因-解剖-病理生理(CEAP)分级、大隐静脉主干直径的不同将患者筛选并分层配对为EMA组(n=157)和RFA组(n=159)。采用视觉模拟评分法(VAS)评价两组患者术后14 d的大隐静脉主干闭合段疼痛情况和皮肤瘀伤情况;术后第14天、6个月,所有患者均通过超声复查治疗段大隐静脉主干闭合情况。比较两组患者的术后并发症发生情况。结果 RFA组患者的术后VAS最高评分出现在术后第1天,EMA组患者的术后VAS最高评分出现在术后第3天。术后第1~10天,两组患者的VAS评分存在差异;与EMA组患者相比,RFA组患者的术后VAS评分更低。两组患者的皮肤瘀伤最高评分均出现在术后第4天;与EMA组患者相比,RFA组患者的皮肤瘀伤评分较低;术后第5~9天,两组患者的皮肤瘀伤评分差异较大。两组患者术后第14天、6个月的治疗段大隐静脉主干闭合率、术后并发症发生情况比较,... 相似文献