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   143656篇
  免费   14102篇
  国内免费   8507篇
耳鼻咽喉   1100篇
儿科学   1825篇
妇产科学   1579篇
基础医学   21464篇
口腔科学   2512篇
临床医学   17302篇
内科学   20088篇
皮肤病学   1577篇
神经病学   7026篇
特种医学   4949篇
外国民族医学   65篇
外科学   13758篇
综合类   23473篇
现状与发展   29篇
一般理论   12篇
预防医学   10111篇
眼科学   3470篇
药学   16596篇
  122篇
中国医学   7848篇
肿瘤学   11359篇
  2024年   570篇
  2023年   2238篇
  2022年   5753篇
  2021年   7266篇
  2020年   5309篇
  2019年   4745篇
  2018年   4970篇
  2017年   4565篇
  2016年   4356篇
  2015年   6328篇
  2014年   7824篇
  2013年   7602篇
  2012年   10646篇
  2011年   11299篇
  2010年   7922篇
  2009年   6403篇
  2008年   7714篇
  2007年   7722篇
  2006年   7018篇
  2005年   6352篇
  2004年   4963篇
  2003年   4830篇
  2002年   4117篇
  2001年   3423篇
  2000年   2952篇
  1999年   2620篇
  1998年   1664篇
  1997年   1784篇
  1996年   1252篇
  1995年   1192篇
  1994年   1089篇
  1993年   764篇
  1992年   968篇
  1991年   884篇
  1990年   790篇
  1989年   727篇
  1988年   652篇
  1987年   564篇
  1986年   528篇
  1985年   424篇
  1984年   369篇
  1983年   302篇
  1982年   268篇
  1981年   229篇
  1980年   196篇
  1979年   198篇
  1978年   192篇
  1977年   211篇
  1976年   191篇
  1974年   156篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Objective: Acute graft-versus-host disease (aGVHD) is a common and life-threatening complication of allogeneic hematopoietic stem cell transplantation (allo-HSCT). The extent to which aGVHD increases inpatient costs associated with allo-HSCT has not been thoroughly evaluated. In this analysis, mortality, hospital length of stay (LOS) and costs associated with aGVHD during allo-HSCT admissions are evaluated.

Methods: This is a retrospective analysis of discharge records from the National Inpatient Sample database for patients receiving allo-HSCT between 1 January 2009 and 31 December 2013. Allo-HSCT discharges with an aGVHD diagnosis were included in the aGVHD group and those without any graft-versus-host disease (GVHD) diagnosis comprised the non-GVHD group. Mortality, LOS and costs were compared between the two groups, as well as within subgroups, including age (<18 vs. ≥18 years) and survival status (alive vs. deceased) at discharge.

Results: Overall, mortality (16.2% vs. 5.3%; p?<?.01), median hospital LOS (42.0 vs. 26.0 days; p?<?.01) and median total costs ($173,144 vs. $98,982; p?<?.01) were significantly increased in patients with aGVHD versus those without GVHD during hospitalizations for allo-HSCT, irrespective of age group. Patients with aGVHD who were <18 years of age had a lower mortality rate but greater hospital LOS and total costs versus patients aged ≥18 years. Patients who died during allo-HSCT hospitalization had longer LOS and incurred greater costs than those who survived in both the aGVHD and non-GVHD groups.

Conclusion: Occurrence of aGVHD during allo-HSCT admissions resulted in a tripling of the mortality rate and a near doubling of hospital LOS and total costs. In addition, death during allo-HSCT hospitalizations was associated with greater healthcare utilization and costs. Effectively mitigating aGVHD may improve survival and substantially reduce hospital LOS and costs for allo-HSCT.  相似文献   

92.
93.
94.
95.
ABSTRACT

Objectives: Limited evidence has suggested that cefoperazone-sulbactam causes coagulation disorders and bleeding.

Methods: The authors conducted a retrospective study to compare patients receiving cefoperazone-sulbactam versus those treated with cefoperazone-tazobactam or ceftazidime. Propensity-score matching was used to explore whether treatment with cefoperazone-sulbactam increased the risk of prothrombin time (PT) prolongation, coagulation disorders, and bleeding, or decreased platelets (PLT).

Results: The cohort included 23,242 patients. Among patients receiving cefoperazone-sulbactam, the risk of PT prolongation, coagulation disorders, decreased PLT, and bleeding was 5.3%, 9.2%, 15.7%, and 4.2%, respectively. Propensity-score matching analyses suggested that cefoperazone-sulbactam increased the risk of PT prolongation (aOR 2.26, 95% CI 1.61–3.18), coagulation disorders (aOR 1.81, 95% CI 1.43–2.30), and decreased PLT (aOR 1.46, 95% CI 1.25–1.72), but not increase bleeding (aOR 1.05, 95% CI 0.79–1.40) compared with ceftazidime. Patients receiving cefoperazone-sulbactam had higher risk of PT prolongation (aOR 1.53, 95% CI 1.11–2.10), coagulation disorders (aOR 1.53, 95% CI 1.21–1.95), but not decreased PLT (aOR 0.93, 95% CI 0.81–1.07) or bleeding (aOR 1.11, 95% CI 0.87–1.42), compared with those receiving cefoperazone-tazobactam.

Conclusion: Cefoperazone-sulbactam may be associated with a higher risk of PT prolongation and coagulation disorders compared with cefoperazone-tazobactam and ceftazidime.  相似文献   
96.
97.
98.
99.
100.
起搏治疗遗传性长QT间期综合征23例   总被引:3,自引:0,他引:3  
目的:评价VVI起搏治疗遗传性长QT综合征的疗效. 方法:对23例有尖端扭转性室速发作,且经正规药物治疗无效或无法耐受的遗传性长QT综合征患者,植入了VVI起搏器.随访这23例患者术后心电图及心脏事件发生率. 结果:QT间期平均值由术前(638.0±55.7)ms缩短至术后的(471.3±48.9)ms,QTc平均值为由0.627±0.07缩短至0.519±0.06.心脏事件的发生率由术前的(0.353±0.46)次/年降至术后(0.111±0.24)次/年,(P=0.039).其中77.5%的患者随访期间无晕厥或猝死等心脏事件发生.90.91%患者存活.2例患者因尖端扭转性室速恶化为室颤抢救无效死亡. 结论:VVI起搏治疗可以有效地减少长QT综合征患者恶性心律失常的发生,是治疗长QT综合征的重要方法之一.  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