全文获取类型
收费全文 | 2104篇 |
免费 | 134篇 |
国内免费 | 25篇 |
专业分类
耳鼻咽喉 | 21篇 |
儿科学 | 21篇 |
妇产科学 | 36篇 |
基础医学 | 237篇 |
口腔科学 | 54篇 |
临床医学 | 176篇 |
内科学 | 702篇 |
皮肤病学 | 15篇 |
神经病学 | 115篇 |
特种医学 | 57篇 |
外科学 | 433篇 |
综合类 | 6篇 |
预防医学 | 73篇 |
眼科学 | 16篇 |
药学 | 113篇 |
中国医学 | 2篇 |
肿瘤学 | 186篇 |
出版年
2024年 | 5篇 |
2023年 | 34篇 |
2022年 | 73篇 |
2021年 | 107篇 |
2020年 | 47篇 |
2019年 | 75篇 |
2018年 | 73篇 |
2017年 | 43篇 |
2016年 | 68篇 |
2015年 | 70篇 |
2014年 | 90篇 |
2013年 | 82篇 |
2012年 | 153篇 |
2011年 | 133篇 |
2010年 | 88篇 |
2009年 | 60篇 |
2008年 | 127篇 |
2007年 | 154篇 |
2006年 | 121篇 |
2005年 | 124篇 |
2004年 | 120篇 |
2003年 | 81篇 |
2002年 | 91篇 |
2001年 | 24篇 |
2000年 | 15篇 |
1999年 | 28篇 |
1998年 | 15篇 |
1997年 | 16篇 |
1996年 | 13篇 |
1995年 | 9篇 |
1994年 | 7篇 |
1993年 | 7篇 |
1992年 | 12篇 |
1991年 | 13篇 |
1990年 | 8篇 |
1989年 | 6篇 |
1988年 | 8篇 |
1987年 | 3篇 |
1986年 | 5篇 |
1985年 | 6篇 |
1982年 | 4篇 |
1981年 | 6篇 |
1980年 | 3篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1972年 | 2篇 |
1971年 | 4篇 |
1970年 | 8篇 |
1969年 | 7篇 |
1968年 | 2篇 |
排序方式: 共有2263条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
35.
36.
Tanaka K Sakai T Nakamura Y Umeda N Lee DJ Nakata Y Hayashi Y Akutsu T Okura T Yamabuki K 《Aging clinical and experimental research》2004,16(1):53-59
BACKGROUND AND AIMS: The purpose of this study was to compare the effects of exercise habituation (3-32 years, mean 13.2 years) on physical vitality among five different groups. METHODS: One hundred and two independent, community-dwelling elderly Japanese men, aged 64.6 +/- 6.6 years, were recruited as subjects. The vital age test battery consisted of various coronary heart disease risk factors and physical fitness elements. RESULTS: The results of analysis of variance revealed that vital age as an index of physical vitality was youngest in joggers (47.9 yr, N=18), intermediate in trekkers (55.8 yr, N=20) and walkers (59.1 yr, N=18), and oldest (69.6 yr, N=20) in patients with ischemic heart disease (IHD). The difference between chronological age and vital age was approximately 15 years (p<0.05) in joggers, and 8 years (p<0.05) in trekkers and walkers. The vital age of sedentary persons (N=26) was only 1.9 years (NS) younger than their chronological age, which was similar to the difference (vital age of 64.1 +/- 8.5 yr vs chronological age of 65.7 +/- 5.4 yr) previously observed in similarly aged exercising IHD patients. CONCLUSIONS: These results indicate that exercise habituation significantly affects the overall health status of most individuals, irrespective of mode of exercise. Among the three modes of exercise, jogging may be most beneficial. Furthermore, regularly exercising coronary patients may have physical vitality similar to that of sedentary men. 相似文献
37.
38.
Yamada T Murakami Y Muto M Okada T Okamoto M Toyama J Yoshida Y Tsuboi N Ito T Kondo T Inden Y Hirai M Murohara T 《Journal of cardiovascular electrophysiology》2004,15(7):745-751
INTRODUCTION: The right pulmonary veins (RPVs) and posterior wall of the right atrium (PRA) are anatomically located adjacent to each other. The aim of this study was to demonstrate the electrophysiologic characteristics of atrial tachycardia (AT) originating from the PRA or RPVs. METHODS AND RESULTS: A total of 26 consecutive patients with AT originating from the RPVs or PRA underwent detailed atrial endocardial mapping and successful radiofrequency catheter ablation. Eight foci were found in the PRA and 18 foci in the RPVs. Analysis of P wave configuration showed that lead V1 was the most helpful in distinguishing the AT foci between these two sites. In all cases, double potential (DP) configurations were recorded from several electrodes of a multielectrode catheter placed in the PRA, and the first DP component (FP) was the earliest potential recorded from the right atrium during the tachycardia. The amplitude of the FP was higher than that of the second DP component (SP) for AT foci originating in the PRA, whereas the reverse occurred for those in the RPV. The activation sequence of the FP was from superior to inferior for the AT foci in the superior RPV, whereas the reverse occurred for the AT foci in the inferior RPV. CONCLUSION: P wave configuration in lead V1 is helpful in distinguishing AT foci between those originating in the PRA and RPVs. The DPs obtained from the PRA can be useful in predicting whether AT foci originate from the PRA or RPVs. 相似文献
39.
Mayu Yazaki Takeru Nabeta Takayuki Inomata Kenji Maemura Takumi Oki Teppei Fujita Yuki Ikeda Shunsuke Ishii Takashi Naruke Yusuke Inoue Junya Ako 《Clinical cardiology》2021,44(2):222
BackgroundClinical significance of left atrial (LA) function and geometry in patients with dilated cardiomyopathy (DCM) remains uncertain.HypothesisLA geometric parameters assessed by cardiac magnetic resonance (CMR) predict the prognosis in patients with DCM.MethodsThe present study included patients with DCM and sinus rhythm who underwent CMR between December 2007 and April 2018. LA volume was measured using CMR. LA sphericity index was computed as the ratio of the measured maximum LA volume by the volume of a sphere with maximum LA length diameter.ResultsWe included 255 patients in this study. During the mean follow‐up of 3.92 years, hospitalization for HF occurred in 37 patients. The LA sphericity index was significantly higher in patients with hospitalization for HF than in those without (0.78 ± 0.35 vs. 0.58 ± 0.18, p < .001). Multivariable Cox regression analysis identified a higher LA sphericity index as an independent predictor of hospitalization for HF. Patients were categorized based on the median of LA sphericity index. The Kaplan–Meier curve showed that patients with a high LA sphericity index (≥0.57) had a significantly higher risk of hospitalization for HF than those with a low LA sphericity index (<0.57).ConclusionLA sphericity index was an independent predictor of hospitalization for HF. Assessment of LA geometric parameters might be useful for risk stratification in patients with DCM. 相似文献
40.
Yosuke Kawamura Hiroaki Yokoyama Kazutaka Kitayama Naotake Miura Misato Hamadate Daiki Nagawa Masashi Nozaka Masamichi Nakata Fumie Nishizaki Kenji Hanada Takashi Yokota Masahiro Yamada Takumi Higuma Hirofumi Tomita 《Clinical cardiology》2021,44(1):91-99
Complete atrioventricular block (CAVB) is a common complication of ST‐segment elevation myocardial infarction (STEMI). Although STEMI patients complicated with CAVB had a higher mortality in the thrombolytic era, little is known about the impact of CAVB on STEMI patients who underwent primary percutaneous coronary intervention (PCI). The study aimed at evaluating the clinical impact of CAVB on STEMI patients in the primary PCI era. We consecutively enrolled 1295 STEMI patients undergoing primary PCI within 24 hours from onset. Patients were divided into two groups according to the infarct location: anterior STEMI (n = 640) and nonanterior STEMI (n = 655). The outcomes were all‐cause death and major adverse cardiocerebrovascular events (MACCE) with a median follow‐up period of 3.8 (1.7–6.6) years. Eighty‐one patients (6.3%) developed CAVB. The incidence of CAVB was lower in anterior STEMI patients than in nonanterior STEMI (1.7% vs 10.7%, p < .05). Anterior STEMI patients with CAVB had a higher incidence of all‐cause deaths (82% vs 20%, p < .05) and MACCE (82% vs 25%, p < .05) than those without CAVB. Although higher incidence of all‐cause deaths was found more in nonanterior STEMI patients with CAVB compared with those without CAVB (30% vs 18%, p < .05), there was no significant difference in the incidence of MACCE (24% vs 19%). Multivariate analysis showed that CAVB was an independent predictor for all‐cause mortality and MACCE in anterior STEMI patients, but not in nonanterior STEMI. CAVB is rare in anterior STEMI patients, but remains a poor prognostic complication even in the primary PCI era. 相似文献