首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   5924篇
  免费   449篇
  国内免费   166篇
耳鼻咽喉   47篇
儿科学   94篇
妇产科学   69篇
基础医学   598篇
口腔科学   163篇
临床医学   578篇
内科学   830篇
皮肤病学   116篇
神经病学   360篇
特种医学   180篇
外科学   580篇
综合类   821篇
现状与发展   2篇
一般理论   1篇
预防医学   549篇
眼科学   267篇
药学   489篇
  5篇
中国医学   258篇
肿瘤学   532篇
  2024年   5篇
  2023年   53篇
  2022年   142篇
  2021年   230篇
  2020年   180篇
  2019年   134篇
  2018年   178篇
  2017年   134篇
  2016年   144篇
  2015年   249篇
  2014年   305篇
  2013年   330篇
  2012年   534篇
  2011年   605篇
  2010年   365篇
  2009年   288篇
  2008年   430篇
  2007年   428篇
  2006年   335篇
  2005年   283篇
  2004年   225篇
  2003年   216篇
  2002年   157篇
  2001年   105篇
  2000年   85篇
  1999年   53篇
  1998年   33篇
  1997年   15篇
  1996年   15篇
  1995年   15篇
  1994年   11篇
  1993年   12篇
  1992年   25篇
  1991年   25篇
  1990年   30篇
  1989年   16篇
  1988年   18篇
  1987年   19篇
  1986年   14篇
  1985年   16篇
  1984年   12篇
  1983年   9篇
  1982年   6篇
  1981年   7篇
  1977年   6篇
  1976年   5篇
  1973年   10篇
  1972年   4篇
  1970年   3篇
  1964年   4篇
排序方式: 共有6539条查询结果,搜索用时 15 毫秒
111.
112.

Objectives

This prospective, observational study evaluated changes in ultrasound measurements of the inferior vena caval index (IVCI), the aorta diameter/IVC diameter index (Ao/IVCD), and the aorta area/IVC area index (Ao/IVCA) during fluid administration in children requiring intravenous fluid administration.

Methods

Children who presented to the pediatric emergency department with symptoms of dehydration were enrolled between May 2015 and February 2016. The maximum diameter of the aorta, from inner wall to inner wall, and the long and short axis diameters of IVC were measured using a convex array transducer in the transverse view. Subsequently, we measured the diameter of the IVC at the subxiphoid area during inspiration and expiration in longitudinal view. We calculated IVCI, Ao/IVCD, and Ao/IVCA during administration of 10 ml/kg and 20 ml/kg normal saline boluses.

Results

IVCI and Ao/IVCA significantly changed immediately after administration of initial 10 ml/kg of NS. Ao/IVCA showed significant change during the additional administration of 10 ml/kg (total 20 ml/kg) normal saline boluses (1.43, IQR 1.12–1.86 vs. 1.08, IQR 0.87–1.45, p value < 0.001). No significant changes were observed for IVCI and Ao/IVCD. Ao/IVCA was significantly correlated with the volume of fluid administered. The coefficient between initial and administration of the 10 ml/kg normal saline bolus was ? 0.396 (p value = 0.010), and that between the 10 ml/kg and 20 ml/kg normal saline boluses was ? 0.316 (p value = 0.038).

Conclusions

Ao/IVCA showed better correlations with the volume of fluid administered than IVCI and Ao/IVCA. Ao/IVCA might be a promising index for assessing the effects of fluid administration.  相似文献   
113.
Clinical Rheumatology - Articular cartilage and periarticular muscle tissues are strongly affected during knee osteoarthritis (OA). Creatine kinase (CK) is an enzyme expressed in several tissues,...  相似文献   
114.
Clinical Rheumatology - Thrombotic microangiopathy (TMA) in systemic lupus erythematosus is a rare manifestation associated with activation of the complement system. This study aimed to compare...  相似文献   
115.
Journal of Thrombosis and Thrombolysis - Patients with COVID-19 are known to be at risk of developing both venous, arterial and microvascular thrombosis, due to an excessive immuno-thrombogenic...  相似文献   
116.
目的探讨临床药师开展药学服务的方法,指导合理用药。方法以1例老年糖尿病合并泌尿系感染患者的治疗为例,临床药师结合病史特点、用药史,进行用药分析,积极参与患者的治疗。结果临床药师通过关注药物的作用特点以及药物和疾病之间的相互影响,更好地保证了患者的用药安全性。结论临床药师在参与治疗的过程中,为临床提供药学服务,对患者用药进行干预,体现了临床药师的价值。  相似文献   
117.
目的探讨不同室温下EDTA修复时间对P504S蛋白在前列腺癌组织中表达的影响情况。方法分析30例前列腺癌患者临床资料,将病理标本分别在3种不同室温下进行抗原修复,分别每例标本切9张片。观察不同室温下进行抗原修复显色反应和背景显色情况。结果室温8~10℃抗原修复30 min,室温18~20℃抗原修复20、25 min显色反应的准确率最高,背景显色效果最好,P<0.05,差异均有统计学意义。结论室温8~10℃抗原修复30 min,18~20℃抗原修复20、25 min对P504S蛋白在前列腺癌组织中表达显色效果最好,为病理诊断提供准确依据,值得临床推广应用。  相似文献   
118.
119.
Purpose

A significant proportion of patients undergoing catheter ablation for atrial fibrillation (AF) experience arrhythmia recurrence. This is mostly due to pulmonary vein reconnection (PVR). Whether mapping using High-Density Wave (HDW) technology is superior to standard bipolar (SB) configuration at detecting PVR is unknown. We aimed to evaluate the efficacy of HDW technology compared to SB mapping in identifying PVR.

Methods

High-Density (HD) multipolar Grid catheters were used to create left atrial geometries and voltage maps in 36 patients undergoing catheter ablation for AF (either due to recurrence of an atrial arrhythmia from previous AF ablation or de novo AF ablation). Nineteen SB maps were also created and compared. Ablation was performed until pulmonary vein isolation was achieved.

Results

Median time of mapping with HDW was 22.3 [IQR: 8.2] min. The number of points collected with HDW (13299.6±1362.8 vs 6952.8±841.9, p<0.001) and used (2337.3±158.0 vs 1727.5±163.8, p<0.001) was significantly higher compared to SB. Moreover, HDW was able to identify more sleeves (16 for right and 8 for left veins), where these were confirmed electrically silent by SB, with significantly increased PVR sleeve size as identified by HDW (p<0.001 for both right and left veins). Importantly, with the use of HDW, the ablation strategy changed in 23 patients (64% of targeted veins) with a significantly increased number of lesions required as compared to SB for right (p=0.005) and left veins (p=0.003).

Conclusion

HDW technology is superior to SB in detecting pulmonary vein reconnections. This could potentially result into a significant change in ablation strategy and possibly to increased success rate following pulmonary vein isolation.

  相似文献   
120.
Diabetes mellitus is the leading cause of end-stage renal disease, and uncontrolled hyperglycemia is directly related to the increased mortality in this setting. As kidney function decreases, it becomes more challenging to control blood glucose since the risk of hypoglycemia increases. Decreased appetite, changes in glycaemia homeostasis, along with reduced renal excretion of anti-hyperglycemic drugs tend to facilitate the occurrence of hypoglycemia, despite the paradoxical occurrence of insulin resistance in advanced kidney disease. Thus, in patients using insulin and/or oral anti-hyperglycemic agents, dynamic adjustments with drug dose reduction or drug switching are often necessary. Furthermore, in addition to consider these pharmacokinetics alterations, it is of utmost importance to choose drugs with proven cardio-renal benefits in this setting, such as sodium-glucose co-transporter 2 inhibitors and glucagon-like peptide 1 receptor agonists. In this review, we summarize the indications and contraindications, titration of doses and side effects of the available anti-hyperglycemic agents in the presence of advanced diabetic kidney disease (DKD) and dialysis, highlighting the risks and benefits of the different agents. Additionally, basic renal function assessment and monitoring of glycemic control in DKD will be evaluated in order to guide the use of drugs and define the glycemic targets to be achieved.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号