全文获取类型
收费全文 | 19311篇 |
免费 | 846篇 |
国内免费 | 381篇 |
专业分类
耳鼻咽喉 | 33篇 |
儿科学 | 248篇 |
妇产科学 | 443篇 |
基础医学 | 963篇 |
口腔科学 | 28篇 |
临床医学 | 2055篇 |
内科学 | 5358篇 |
皮肤病学 | 32篇 |
神经病学 | 583篇 |
特种医学 | 417篇 |
外科学 | 1322篇 |
综合类 | 3817篇 |
预防医学 | 2237篇 |
眼科学 | 47篇 |
药学 | 2146篇 |
20篇 | |
中国医学 | 740篇 |
肿瘤学 | 49篇 |
出版年
2023年 | 124篇 |
2022年 | 306篇 |
2021年 | 432篇 |
2020年 | 434篇 |
2019年 | 344篇 |
2018年 | 303篇 |
2017年 | 399篇 |
2016年 | 408篇 |
2015年 | 491篇 |
2014年 | 1500篇 |
2013年 | 1610篇 |
2012年 | 1356篇 |
2011年 | 1437篇 |
2010年 | 1298篇 |
2009年 | 1072篇 |
2008年 | 1083篇 |
2007年 | 1152篇 |
2006年 | 1032篇 |
2005年 | 882篇 |
2004年 | 670篇 |
2003年 | 623篇 |
2002年 | 552篇 |
2001年 | 507篇 |
2000年 | 432篇 |
1999年 | 356篇 |
1998年 | 243篇 |
1997年 | 178篇 |
1996年 | 154篇 |
1995年 | 151篇 |
1994年 | 137篇 |
1993年 | 116篇 |
1992年 | 93篇 |
1991年 | 63篇 |
1990年 | 73篇 |
1989年 | 57篇 |
1988年 | 68篇 |
1987年 | 40篇 |
1986年 | 32篇 |
1985年 | 41篇 |
1984年 | 36篇 |
1983年 | 15篇 |
1982年 | 40篇 |
1981年 | 29篇 |
1980年 | 23篇 |
1979年 | 25篇 |
1978年 | 19篇 |
1977年 | 22篇 |
1976年 | 18篇 |
1975年 | 14篇 |
1973年 | 15篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
《Nutrition, metabolism, and cardiovascular diseases : NMCD》2022,32(4):908-917
Background and aimsReducing dietary cholesterol is generally acceptable for the prevention of cardiovascular disease (CVD). Eggs are nutrient-dense and common food items across the world, while rich in cholesterol. The potential effects of egg intake on cardiovascular health remain uncertainty and have been under debate in past decades.Methods and resultsA nationwide cohort of 20,688 participants aged 16–110 years without CVD at baseline were derived from the China Family Panel Studies. Egg consumption was assessed by a semi-quantitative food frequency questionnaire. We adopted stratified Cox proportional hazards model with random intercepts for provinces to evaluate associations of egg intake with CVD incidence. During a median follow-up of 6.0 years, we identified 2395 total CVD incidence and mean egg consumption was 3 times/week. Egg intakes were associated lower risks of CVD incidence in the multivariate-adjusted model. Compared with the non-consumers, the corresponding HRs (95% confidence interval) for total CVD events were 0.84 (0.74–0.94) for 1–2 times per week, 0.78 (0.69–0.88) for 3–6/week, and 0.83 (0.72–0.95) for ≥7/week. Similar relationships were found in hypertension. Approximately non-linear relationships were observed between egg consumption with total CVD and hypertension incidence, identifying the lowest risk in 3–6 times/week. Subgroup analyses estimated lower risks of total CVD and hypertension in females only, with significant effect modification by sex (P for interaction = 0.008 and 0.020).ConclusionEgg consumption may be associated with lower risks of CVD incidence among Chinese adults. Our findings could have implications in CVD prevention and might be considered in the development of dietary guidelines. 相似文献
4.
《Annales de cardiologie et d'angeiologie》2022,71(2):112-114
The pulmonary alveolocapillary dysplasia (ACD) with pulmonary vein misalignment (PVM) is a rare condition characterized by a congenital anomaly of the development of the pulmonary parenchyma. We present a case of an 8-month-old infant who died quickly from acute respiratory failure complicating an unknown ACD. We also describe its epidemiological characteristics in infants and we discuss the diagnosis's difficulties. In this case, a pulmonary arterial hypertension was decompensated by an infection. A medico-legal autopsy was performed. As for the Histological examination, it showed the features of ACD/PVM. 相似文献
5.
6.
A. Kallifatidis S.-A. Mouratoglou G. Giannakoulas S. Finitsis H. Karvounis G. Sianos 《Diagnostic and interventional imaging》2021,102(3):153-161
PurposeThe purpose of this study was to investigate right atrial and ventricular strain parameters on cardiac magnetic resonance (CMR) in patients with precapillary pulmonary hypertension (PPH) and whether they can aid in the assessment of PPH prognosis.Materials and methodsAdult patients with groups 1 and 4 PPH were invited to participate in the study. Age- and sex-matched healthy volunteers were also recruited as controls. At baseline, patients underwent clinical examination, N-terminal pro-B-type natriuretic peptide measurement and CMR with feature tracking post-processing (CMR-FT). Healthy controls underwent only CMR-FT. The study's primary endpoint was clinical failure, defined as death, hospitalization or demonstrable clinical deterioration during follow-up. Patients who were unable to perform 6-minute walking test due to musculoskeletal disorders were excluded from the study.ResultsThirty-six patients (8 men, 28 women; mean age, 50.6 ± 13.8 [SD] years [range: 18.6–78.5 years]) and 12 healthy control subjects (5 mean, 7 women; mean age, 40.6 ± 13.5 [SD] years [range: 23.1–64.4 years]) were recruited. Right ventricular global longitudinal strain (GLS) was significantly impaired in PPH patients (?20.2 ± 5.3 [SD] % [range: ?28.8 to ?9.1%] vs. ?28.4 ± 3.1% [?33.7 to ?22.7%] respectively, P < 0.001). The right atrial GLS was significantly impaired in PPH compared to healthy controls (?19.9 ± 4.5% [range: ?28.6 to ?3.6%] vs. ?26.5 ± 4.2% [range: ?32.8 to ?15.8%] respectively) (P < 0.001). Clinical failure occurred in 19 (19/36, 53%) of patients. Right ventricular GLS predicted clinical failure most reliably among CMR parameters (?22.6 ± 3.8 [SD] % [range: ?27.6 to ?12.7%] for patients without clinical failure vs. ?18 ± 5.6 [SD] % [range: ?28.8 to ?9.1%] for patients with clinical failure; hazard ratio [HR] = 1.85; P = 0.007; area under the AUC curve = 0.75). Lower absolute right atrial GLS was significantly associated with clinical failure (?22.7 ± 3.0 [SD] % [range: ?28.6 to ?17.7%] for patients without clinical failure vs. ?16.9 ± 5.8 [SD] % [range: ?24.2 to ?3.6%] for patients with clinical failure) (HR = 1.53; P = 0.035).ConclusionCMR feature tracking-derived myocardial strain parameters of both the right atrium and ventricle can assist clinicians in the prognosis of PPH. 相似文献
7.
妊娠期高血压疾病是女性妊娠期间极为常见的一种妊娠并发症,亦为妇产科临床中极为常见的一种病症,该病症可产生 极大的危害性。目前临床主要站在流行病学角度上研究妊娠期高血压疾病,针对该病症的发病诱因、机制等尚未有统一认识形 成。本文主要分析和总结妊娠期高血压疾病的相关危险因素和护理干预措施,以供今后临床作参考。 相似文献
8.
目的 分析2型糖尿病及其合并高血压高血脂患者四诊特征参数,为该病证临床诊断提供四诊客观化指标。方法 使用中医生命信息分析系统(Smart TCM-I型)采集370例2型糖尿病患者的舌象、面象、声音及脉象信息,提取并分析该病四诊特征参数。结果 2型糖尿病及其合并高血压高血脂患者在整体舌色、面色参数RGB,声诊共振峰参数F3以及脉图时域参数h3、h5、h5/h1有显著性差异(P<0.05)。结论 高血压和高血脂将加重糖尿病的血瘀、虚损以及血管硬化,三高者病变程度最重。2型糖尿病及其合并高血压高血脂患者四诊客观参数具有显著差异性,为该病的中医诊断及疗效评价提供一定的客观依据。 相似文献
9.
10.
《Clínica e investigación en ginecología y obstetricia》2022,49(2):100740
Preeclampsia is a disease with a significant incidence worldwide that is directly associated with 15% of maternal deaths. This is usually characterized by the presence of hypertension and proteinuria, which manifests itself from the middle of pregnancy. MicroRNAs are single-stranded RNA molecules that act primarily by degrading transcribed messenger RNA or inhibiting microRNA translation. Placental microRNAs play a role in the growth and function of the placenta, their potential use as diagnostic biomarkers is considered feasible due to the ability to enter the maternal circulation and be detectable in maternal plasma. 相似文献