收费全文 | 8469篇 |
免费 | 428篇 |
国内免费 | 162篇 |
耳鼻咽喉 | 77篇 |
儿科学 | 167篇 |
妇产科学 | 58篇 |
基础医学 | 964篇 |
口腔科学 | 60篇 |
临床医学 | 1601篇 |
内科学 | 1465篇 |
皮肤病学 | 222篇 |
神经病学 | 391篇 |
特种医学 | 604篇 |
外科学 | 1339篇 |
综合类 | 927篇 |
预防医学 | 410篇 |
眼科学 | 42篇 |
药学 | 475篇 |
2篇 | |
中国医学 | 155篇 |
肿瘤学 | 100篇 |
2023年 | 113篇 |
2022年 | 270篇 |
2021年 | 368篇 |
2020年 | 300篇 |
2019年 | 213篇 |
2018年 | 212篇 |
2017年 | 289篇 |
2016年 | 284篇 |
2015年 | 276篇 |
2014年 | 632篇 |
2013年 | 651篇 |
2012年 | 489篇 |
2011年 | 510篇 |
2010年 | 460篇 |
2009年 | 413篇 |
2008年 | 420篇 |
2007年 | 375篇 |
2006年 | 311篇 |
2005年 | 247篇 |
2004年 | 212篇 |
2003年 | 205篇 |
2002年 | 171篇 |
2001年 | 149篇 |
2000年 | 137篇 |
1999年 | 121篇 |
1998年 | 101篇 |
1997年 | 103篇 |
1996年 | 76篇 |
1995年 | 83篇 |
1994年 | 89篇 |
1993年 | 59篇 |
1992年 | 68篇 |
1991年 | 50篇 |
1990年 | 52篇 |
1989年 | 51篇 |
1988年 | 49篇 |
1987年 | 42篇 |
1986年 | 34篇 |
1985年 | 56篇 |
1984年 | 30篇 |
1982年 | 26篇 |
1981年 | 19篇 |
1980年 | 20篇 |
1979年 | 20篇 |
1978年 | 20篇 |
1976年 | 21篇 |
1975年 | 18篇 |
1973年 | 31篇 |
1972年 | 16篇 |
1971年 | 20篇 |
Background and objective
Pressure ulcer (PU) is one of the important and frequent complications of hospitalization, associated with high treatment costs. The present study was conducted to determine the incidence of PU and its direct treatment costs for patients in intensive care unit (ICU) in Iran.Material and methods
In this retrospective study, medical records of 643 discharged patients from ICU of two selected hospitals were examined. The demographic and clinical data of all patients and data of resources and services usage for patients with PU were extracted through their records. Data analysis was done using logistic regression tests in SPSS 22 software. The cost of PU treatment was calculated for each grade of ulcer.Results
The findings showed that 8.9% of patients developed PU during their stay in ICU. Muscular paralysis (OR?=?5.1), length of stay in ICU (OR?=?4.0), diabetes (OR?=?3.5) age (OR?=?2.9), smoking (OR?=?2.1) and trauma (OR?=?1.4) were the most important risk factors of PU. The average cost of PU treatment varied from USD 12 for grade I PU to USD 66?834 for grade IV PUs. The total treatment costs for all studied patients with PU was estimated at USD 519?991.Conclusion
The cost of PU treatment is significant. Since the preventive measures are more cost-effective than therapeutic measures, therefore, effective preventive interventions are recommended. 相似文献Background
In Leriche syndrome, postoperative graft thrombosis remains one of the most significant clinical challenges.Methods
We reviewed 51 patients who underwent surgery for aortoiliac occlusive disease at our hospital from January 2007 to December 2014. The factors associated with graft patency were determined using the Cox proportional hazard model.Results
The 2-year prosthetic graft patency rate was 72.5%. Younger age (p = 0.017, Odd ratio (OR) = 1.112), postoperative uncontrolled hypertension (p = 0.044, OR = 3.797), and associated Trans Atlantic Inter-Society Consensus for the Management of Peripheral Arterial Disease II (TASC II) D femoropopliteal lesion (p = 0.008, OR = 11.139) were significantly related factors for prosthetic graft patency after surgical repair. The existing comorbidities of the patients that indicated the need for axillo-bifemoral bypass seemed to be related to lower graft patency or other complications.Conclusions
For better graft patency after an open surgical repair of Leriche syndrome, strict postoperative hypertension control and distal run-off resolution are necessary. 相似文献Pulse wave velocity remained significantly higher in previously pre-eclamptic women than non-pregnant controls up to three months after delivery (p < 0.05), then it reduced to nonsignificant values. All blood pressure indices (central and brachial pressures), were higher in previously pre-eclamptic women as compared to nonpregnant controls up to one year postpartum.
Regional (aortic) arterial stiffness, though it persists for some time after delivery, is transitory in previously pre-eclamptic women from the rural Africa setting. However, their increase blood pressure is an indication of compromised arterial compliance in women previously with pre-eclampsia. 相似文献