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   672篇
  免费   31篇
  国内免费   12篇
耳鼻咽喉   11篇
儿科学   13篇
妇产科学   8篇
基础医学   17篇
口腔科学   7篇
临床医学   81篇
内科学   96篇
皮肤病学   2篇
神经病学   15篇
特种医学   26篇
外科学   149篇
综合类   135篇
预防医学   54篇
眼科学   6篇
药学   71篇
中国医学   12篇
肿瘤学   12篇
  2023年   11篇
  2022年   27篇
  2021年   25篇
  2020年   20篇
  2019年   17篇
  2018年   25篇
  2017年   13篇
  2016年   17篇
  2015年   25篇
  2014年   64篇
  2013年   54篇
  2012年   61篇
  2011年   62篇
  2010年   44篇
  2009年   42篇
  2008年   36篇
  2007年   36篇
  2006年   23篇
  2005年   24篇
  2004年   24篇
  2003年   15篇
  2002年   12篇
  2001年   7篇
  2000年   5篇
  1999年   4篇
  1998年   2篇
  1997年   3篇
  1996年   4篇
  1995年   1篇
  1994年   3篇
  1991年   1篇
  1990年   1篇
  1988年   1篇
  1986年   1篇
  1985年   1篇
  1984年   1篇
  1978年   1篇
  1972年   1篇
  1970年   1篇
排序方式: 共有715条查询结果,搜索用时 31 毫秒
11.
维药祖卡木颗粒剂澄清工艺的研究   总被引:1,自引:0,他引:1  
目的:评价三种天然澄清剂ZTC、101果汁澄清剂、壳聚糖与乙醇对维药祖卡木水提液的澄清效果。方法:通过用HPLC法测定祖卡木药液中大黄酚及甘草酸的含量,以有效成分的保留率及固形物收率为指标对4种澄清剂进行比较研究。结果:ZTC天然澄清剂、101果汁澄清剂、壳聚糖、乙醇澄清的药液中大黄酚的保留率分别为85.94%,86.64%,84.47%,89.67%。甘草酸的保留率分别为95.18%,83.30%,83.90%,81.82%。固形物收率分别为17.58%,16.23%,18.12%,17.04%。结论:澄清剂与乙醇沉淀法相比可提高有效成分含量,保持固形物的收率。  相似文献   
12.
肺癌肺叶袖状切除术的安全性和有效性   总被引:12,自引:2,他引:12  
目的:评价肺癌肺叶袖状切除术后患者的手术安全性和远期生存状况.方法:回顾分析了1999年10月至2003年12月行肺癌根治术的94名病例,其中肺叶袖状切除术11例(Ⅰ组),全肺切除术17例(Ⅱ组),肺叶切除术66例(Ⅲ组).通过比较三组术后气管插管时间、ICU停留时间、吻合口并发症率及围手术期死亡率,评价肺叶袖状切除术的手术安全性,比较Ⅰ、Ⅱ组间的生存期和转移复发率探讨其远期有效性.组间率比较用x2检验或Fisher精确检验,均数比较用t检验,生存分析用Kaplan-Meier法,生存曲线比较用Log rank检验.显著性差异标准α=0.05.结果:Ⅰ、Ⅱ、Ⅲ组的手术死亡率为0,11.8%,3.0%,组间无显著性差异;平均气管插管时间为0.5±2.3天,2.0±7.2天,0.6±4.1天(Ⅰ、ⅢVSⅡ组,P<0.05);吻合口并发症率为3.0%,0,5.8%,组间无显著性差异.Ⅰ组1年、3年生存率为45.5%、32.5%,Ⅱ组为58.8%、45.8%.两组生存率、远期局部复发率和转移率无显著性差异.结论:肺癌肺叶袖状切除术具有和肺叶切除术相近的手术安全性,优于全肺切除术,而其复发转移率、远期疗效与后者相近,是安全有效的手术方式.  相似文献   
13.
14.
Most recent studies on procedures for stabilizing the glenohumeral joint focus on arthroscopic techniques. A relatively simple open procedure is the modified Putti-Platt procedure. The aim of these retrospective case series was to evaluate the functional outcome, patient satisfaction, and quality of life of patients who underwent this procedure. After a median follow-up time of 4.7 (P25–P75 1.7–6.8) years, fifty-one patients could be enrolled with a mean age of 25 (21–39) years. Five patients (10 %) reported re-dislocations. The median Constant score for the affected side was 84 (P25–P75 75–91). Median loss of motion in abduction, elevation, external rotation, and external rotation in 90° of abduction did not exceed 10° when compared to the healthy shoulder. A median Rowe score of 92 (P25–P75 75–95) was measured. The WOSI score and SF-36 showed excellent quality of life. The VAS proved high patient satisfaction with the outcome; 7.9 (6.8–9.5). We concluded that the modified Putti-Platt procedure leads to excellent outcome scores and only marginal restriction in range of motion combined with a high patient satisfaction. Our data prove that excellent results can be obtained with a relatively simple open procedure.  相似文献   
15.
Aim: The epidemiology of acute hepatitis B is unknown in many countries, and the clinical features of this disease remain unclear. In this study, we used the Diagnosis Procedure Combination (DPC) database to estimate the incidence of acute hepatitis B and investigate the clinical practices for acute hepatitis B in Japan. Methods: The DPC database is a nationwide discharge abstract and administrative claims database, covering 40% of all inpatient admissions to acute care hospitals between 1 July and 31 December each year in Japan. We identified cases with a diagnosis of acute hepatitis B between 2007 and 2008. Patient characteristics, length of stay, in‐hospital mortality and total charges were determined. Clinical practice patterns were examined, including drugs used and procedures performed during hospitalization. Results: We identified 890 cases with acute hepatitis B among 5.85 million inpatients in the database. The mean age was 40.0 years old and 76% were male. The incidence of acute hepatitis B was estimated to be approximately 2100–2400/year (17–19/1 million people per year). Of 890 cases, 53 (6.0%) developed fulminant hepatitis and 36 (4.0%) died. Nucleos(t)ide analogs were prescribed for 226 cases (25.4%). Only 194 cases (21.8%) were tested for HIV status. Conclusion: It is essential to monitor the trends of this communicable and preventable disease. The establishment and distribution of appropriate clinical evidence and guidelines are vital to improve the clinical practices for acute hepatitis B.  相似文献   
16.
The Japanese Respiratory Society 2017 guidelines strongly recommend switching from intravenous (IV) to oral antibiotics in patients with community-acquired pneumonia (CAP), following improvement in clinical symptoms and laboratory findings. Here, we retrospectively investigated the real-world, nationwide treatment and switching patterns for hospitalized patients with CAP in Japan using administrative data from 372 Japanese Diagnosis Procedure Combination hospitals from April 2010 to December 2018. Hospitalizations for CAP (patient age ≥20 years) with an A-DROP classification for CAP severity and IV antibiotics initiated on the admission date were included. Overall, 210,314 hospitalizations (moderate CAP: 61.7%) in 183,607 patients were analyzed. The median (interquartile range [IQR]) age at admission was 79 (70–86) years. Penicillin (51.9%) and cephalosporin (38.9%) were the most common IV antibiotic classes used and the median (IQR) duration of IV use was 8 (6–11) days. Switching to oral antibiotics during a hospitalization occurred in 30.1% (n = 63,311) of patients after a median (IQR) of 7 (5–10) days of IV treatment. The most frequently used oral antibiotic classes after a switch were fluoroquinolone (45.9%) and penicillin (24.8%). The switch rate was higher among hospitalizations with milder CAP, in respiratory medicine ward and in larger hospitals. The overall switch rates did not change over the study period. The findings from this analysis suggest that early switch from IV to oral antibiotics was not widely implemented during the 8 years of the study period. Further observation will be needed to see the potential impact of the guidelines update in 2017 in Japan.  相似文献   
17.
PurposeTo describe national trends in the utilization of endovascular approaches (including balloon angioplasty, atherectomy, and stent placement) for the management of femoropopliteal peripheral arterial disease (PAD).Materials and MethodsThe Medicare Physician/Supplier Procedure Summary dataset containing 100% of Part B claims was interrogated for years 2011–2019. The Current Procedural Terminology codes specific for femoropopliteal angioplasty, stent placement, and atherectomy were used to create summary statistics for utilization by year, place of service (hospital inpatient, hospital outpatient, and office-based laboratory), and provider specialty (cardiology, radiology, and surgery).ResultsThe use of atherectomy increased from 34,732 (33%) procedures in 2011 to 75,435 (53%) procedures in 2019, and atherectomy became the dominant treatment strategy for femoropopliteal PAD. The relative utilization of stent placement (36,793 [35%] to 28,899 [20%]) and angioplasty only (34,398 [32%] to 38,228 [27%]) decreased concomitantly from 2011 to 2019. By 2019, the use of atherectomy was twofold higher in office-based laboratories than in the outpatient hospital setting (44,767 and 20,901, respectively). Treatment strategy varied by provider specialty in 2011 when cardiologists used atherectomy most frequently (17,925 [43%]), whereas radiologists used angioplasty alone (5,928 [6%]) and surgeons stented (18,009 [37%]) most frequently. By 2019, all specialties utilized atherectomy most frequently (29,564 [59%] for cardiology, 10,912 [58%] radiology, and 33,649 [47%] surgery).ConclusionsThe national approach to endovascular management of femoropopliteal PAD has changed since 2011 toward an implant-free strategy, including a multifold increase in the use of atherectomy. Discordant rates of atherectomy use between the ambulatory hospital and office-based settings highlight the need for comparative effectiveness studies to guide management.  相似文献   
18.
关于规范器官获取组织流程的思考   总被引:1,自引:0,他引:1  
近年来,中国的器官移植事业发展较快,但由于缺乏系统规范的管理体系,衍生出了一系列社会、伦理、法律等方面的问题。通过分析我国器官捐献与获取现状以及所存在的问题,提示应采取及时发现潜在案例、判定生命状态、规范报批捐献手续、维护脏器功能、获取捐献器官、安抚供者家属、分配捐献器官等一系列措施来完善器官获取组织流程,以推进我国器官移植事业的健康长久发展。  相似文献   
19.
20.
Rejection sensitivity – the tendency to expect, perceive, and overreact to rejection by others – is linked with individuals' expectations that their romantic partners' behaviors have negative intent, even if, perhaps, such behaviors could be considered neutral when observed by another. The aim of the present study was to test this proposition, derived from rejection sensitivity theory, using a Video-Recall Procedure with adolescent couples in the US (N = 386 adolescents, 50% girls). We examined whether adolescents who were more sensitive to rejection perceived their romantic partners' behaviors as more conflictual than when viewed by trained, third-party observers. Findings suggest that, at the micro-analytic level, higher rejection sensitivity is associated with adolescents' heightened perception of their romantic partners as conflictual when compared to observers, who more often coded the same behaviors as neutral rather than conflictual. Implications for adolescent mental health and well-being are discussed.  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