收费全文 | 56652篇 |
免费 | 3978篇 |
国内免费 | 1229篇 |
耳鼻咽喉 | 384篇 |
儿科学 | 1223篇 |
妇产科学 | 507篇 |
基础医学 | 4679篇 |
口腔科学 | 478篇 |
临床医学 | 7777篇 |
内科学 | 11887篇 |
皮肤病学 | 271篇 |
神经病学 | 3408篇 |
特种医学 | 2655篇 |
外国民族医学 | 5篇 |
外科学 | 6596篇 |
综合类 | 7640篇 |
现状与发展 | 3篇 |
预防医学 | 3375篇 |
眼科学 | 2757篇 |
药学 | 5768篇 |
36篇 | |
中国医学 | 1504篇 |
肿瘤学 | 906篇 |
2024年 | 469篇 |
2023年 | 1104篇 |
2022年 | 1790篇 |
2021年 | 2413篇 |
2020年 | 2235篇 |
2019年 | 2047篇 |
2018年 | 2074篇 |
2017年 | 1858篇 |
2016年 | 1792篇 |
2015年 | 1791篇 |
2014年 | 3585篇 |
2013年 | 4164篇 |
2012年 | 2934篇 |
2011年 | 3382篇 |
2010年 | 2458篇 |
2009年 | 2522篇 |
2008年 | 2616篇 |
2007年 | 2625篇 |
2006年 | 2261篇 |
2005年 | 1896篇 |
2004年 | 1627篇 |
2003年 | 1355篇 |
2002年 | 1181篇 |
2001年 | 1104篇 |
2000年 | 882篇 |
1999年 | 795篇 |
1998年 | 732篇 |
1997年 | 724篇 |
1996年 | 614篇 |
1995年 | 648篇 |
1994年 | 597篇 |
1993年 | 502篇 |
1992年 | 518篇 |
1991年 | 456篇 |
1990年 | 417篇 |
1989年 | 374篇 |
1988年 | 364篇 |
1987年 | 337篇 |
1986年 | 308篇 |
1985年 | 364篇 |
1984年 | 355篇 |
1983年 | 205篇 |
1982年 | 280篇 |
1981年 | 224篇 |
1980年 | 208篇 |
1979年 | 167篇 |
1978年 | 151篇 |
1977年 | 94篇 |
1976年 | 76篇 |
1975年 | 53篇 |
Objective
Patient selection for open lower extremity revascularization in patients with chronic kidney disease (CKD) remains a clinical challenge. This study investigates the impact of CKD on early graft failure, postoperative complications, and mortality in patients undergoing lower extremity bypass for critical limb ischemia.Methods
The National Surgical Quality Improvement Program database was queried for all patients with critical limb ischemia from 2012 to 2015 who underwent lower extremity bypass using the targeted vascular set. The glomerular filtration rate was calculated using the Chronic Kidney Disease Epidemiology Collaboration Study equation. CKD categories were determined from the National Kidney Foundation Kidney Disease Outcomes Quality Initiative staging criteria. Patients were classified into three groups: CKD stages 3 or lower (mild to moderate CKD), CKD stages 4 or 5 (severe CKD), and on hemodialysis (HD). Multiple variable analysis was used to examine graft failure, mortality, and postoperative complications.Results
The Surgical Quality Improvement Program database identified 6978 patients who underwent infrainguinal lower extremity arterial bypass during the study period. There were 6101 patients (87.4%) with mild to moderate CKD, 327 (4.7%) with severe CKD, and 550 (7.9%) on HD. Patients with severe CKD and on HD were more likely to have revascularization for tissue loss (54.9% vs 68.8% and 74.7%; P < .01). Patients with severe CKD and those on HD had higher rates of early graft failure, postoperative myocardial infarction, and rates of reoperation. Multiple variable analysis confirmed these results showing that HD was associated with postoperative myocardial infarction, readmission, and increased mortality. It also demonstrated that severe CKD was associated with graft failure (odds ratio [OR], 1.67; 95% confidence interval [CI], 1.12-2.50; P = .01), postoperative myocardial infarction (OR, 2.16; 95% CI, 1.35-3.45; P < .01), and readmission (OR, 1.38; 95% CI, 1.06-1.80; P = .02). Other factors associated with graft failure include functional status (OR, 1.39; 95% CI, 1.08-1.80; P = .01), African American race (OR, 1.72; 95% CI, 1.39-2.13; P < .01), and distal bypass (OR, 1.33; 95% CI, 1.09-1.61; P < .01).Conclusions
CKD is a significant predictor of perioperative morbidity after lower extremity bypass. Patients with severe CKD have worse postoperative outcomes without increased mortality. Those on HD have worse survival and postoperative outcomes. 相似文献Background
Post-stroke dysphagia is characterized by reduced corticolingual excitability and lingual pressure; however, it remains unknown if transcranial magnetic stimulation (TMS) directly facilitates lingual pressure generation. 相似文献- KEY MESSAGES
Numerous recent publications have examined the relation between cardiovascular disease and long-term blood pressure (BP) exposure, quantified using indices such as time-averaged BP, cumulative BP, BP trajectory patterns, and age of hypertension onset.
This review summarises existing research on the association between these indices and hard cardiovascular outcomes, outlines the strengths and weaknesses of these indices, and provides an overview of how longitudinal BP changes can be measured and used to improve cardiovascular disease risk prediction.
Although longitudinal BP indices seem to predict cardiovascular outcomes better than present BP, there are considerable differences in the clinical feasibility of these indices along with a limited number of prospective data.