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   17052篇
  免费   1835篇
  国内免费   459篇
耳鼻咽喉   48篇
儿科学   328篇
妇产科学   220篇
基础医学   843篇
口腔科学   179篇
临床医学   2122篇
内科学   2998篇
皮肤病学   597篇
神经病学   896篇
特种医学   323篇
外国民族医学   3篇
外科学   1070篇
综合类   1482篇
现状与发展   2篇
一般理论   1篇
预防医学   1706篇
眼科学   213篇
药学   4867篇
  65篇
中国医学   563篇
肿瘤学   820篇
  2024年   37篇
  2023年   654篇
  2022年   745篇
  2021年   1204篇
  2020年   1339篇
  2019年   1081篇
  2018年   921篇
  2017年   853篇
  2016年   742篇
  2015年   727篇
  2014年   1300篇
  2013年   1415篇
  2012年   992篇
  2011年   1042篇
  2010年   867篇
  2009年   726篇
  2008年   715篇
  2007年   654篇
  2006年   501篇
  2005年   396篇
  2004年   345篇
  2003年   356篇
  2002年   217篇
  2001年   194篇
  2000年   142篇
  1999年   132篇
  1998年   93篇
  1997年   92篇
  1996年   93篇
  1995年   83篇
  1994年   63篇
  1993年   68篇
  1992年   78篇
  1991年   91篇
  1990年   70篇
  1989年   43篇
  1988年   47篇
  1987年   48篇
  1986年   44篇
  1985年   24篇
  1984年   20篇
  1983年   12篇
  1982年   15篇
  1981年   18篇
  1980年   7篇
  1979年   5篇
  1978年   5篇
  1977年   11篇
  1976年   5篇
  1974年   5篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
《Vaccine》2022,40(41):5997-6000
Coronavirus disease 2019 (COVID-19) vaccine administration started in February 2021 in Japan. As of December 2021, approximately 75% of the population aged ≥12 years had received two doses of vaccine. We conducted a study to investigate vasovagal reactions (VVR) after COVID-19 vaccination using data on adverse events following immunization. The crude reporting rate of VVR (cases/1,000,000 doses) after vaccination was 9.6 in all age groups combined, and was more frequent in the younger age groups: 28.6 and 37.2 in individuals aged 10–19 years and 20–29 years, respectively. In individuals aged 10–29 years, the rate was similar in males and females (33.0 and 34.2, respectively, p = 0.53); but was higher after dose 1 than after dose 2 (57.4 and 8.8, respectively, p < 0.001). Based on these results, caution needs to be exercised when vaccinating adolescents and young adults, especially with dose 1 of COVID-19 vaccines.  相似文献   
23.
PurposeTo compare the technical success of antegrade uteral stent (AUS) and retrograde ureteral stent (RUS) placements in patients with malignant ureteral obstruction (MUO) and to determine the predictors of technical failure of RUS.Materials and MethodsThis study retrospectively included 61 AUS placements (44 patients) performed under fluoroscopic guidance and 76 RUS placements (55 patients) performed under cystoscopic guidance in patients with MUO from January 2019 to December 2020. Technical success rates of the 2 techniques were compared using inverse probability of treatment weighting (IPTW) analysis. Logistic regression was used to identify predictive factors for technical failures.ResultsTechnical success was achieved in 98.4% of the AUS group and 47.4% of the RUS group. After stabilized IPTW, the technical success rate was higher in the AUS group than in the RUS group (adjusted risk difference, 49.4%; 95% confidence interval [CI], 35.4%–63.1%). The independent predictors for technical failure of the RUS procedure were age of ≥65 years (odds ratio [OR], 5.56; 95% CI, 1.73–21.27), ureteral orifice invasion (OR, 4.21; 95% CI, 1.46–13.46), and extrinsic cancer (OR, 15.58; 95% CI, 2.92–111.81).ConclusionsThe technical success rate of AUS placement was higher than that of RUS placement in patients with MUO. RUS failure was associated with age of ≥65 years, cancer with ureteral orifice invasion, and extrinsic ureteral obstruction.  相似文献   
24.
The advent of immune checkpoint inhibitors has improved survival in some types of cancer and brought promising prospects to cancer immunotherapy. Despite their clinical benefits, significant off‐target toxicities resulting from the immune system activation have been observed, namely immune‐related adverse events (irAEs), which pose to clinicians a new challenge of optimal management. With steroids being the mainstay of current management of irAEs, immunosuppressive agents are especially indicated for severe or steroid‐refractory cases, based on current immunopathophysiological knowledge and on extrapolations of treatment options for primary autoimmune disorders. This review focuses on the status and recent clinical progress of immunosuppressive agents in the management of severe and steroid‐refractory irAEs.  相似文献   
25.
目的 探究PDCA循环在皮肤科护理管理中的应用效果.方法 纳入医院皮肤科2017年8月—2018年10月间的患者,共100例,计算机筛选后分为对照组和观察组,均有50例,在治疗期间前者接受常规护理,后者采取PDCA循环管理护理,比对护理满意度、并发症、生活质量和瘙痒情况.结果 不良反应发生率[观察组(4.00%)vs.对照组(18.00%)],P<0.05;护理满意度[观察组(98.00%)vs.对照组(80.00%)],P<0.05;观察组各维度的生活质量评分值均显著高于对照组,P<0.05;瘙痒程度评估观察组显著低于对照组,P<0.05.结论 在皮肤科护理管理中采取PDCA循环管理,可改善患处皮肤状况,提升患者的舒适度,提高其生活质量,整体提升护理的水平.  相似文献   
26.
ABSTRACT

Introduction

Acne is a chronic, inflammatory, and immune mediated disease of pilosebaceous unit, highly prevalent in adolescents. It involves face, trunk, and back; may leave scars and affect quality of life. Early, effective, and safe treatment is the key for disease resolution. Oral isotretinoin is the unique treatment for cure or prolonged remission for moderate and severe acne, preventing psychosocial impact and scars. It inhibits sebaceous glands activity and has anti-inflammatory and immunoregulatory properties.  相似文献   
27.
BackgroundIn the phase III MDS-005 study of patients with lower-risk, non-del(5q) myelodysplastic syndromes, lenalidomide was associated with a higher rate of ≥ 8 weeks red blood cell transfusion independence (RBC-TI) compared with placebo, but also with a higher risk of hematologic adverse events (AEs).Patients and MethodsThis analysis evaluated the ratio of clinical benefit-risk in patients treated with lenalidomide or placebo, and assessed the effect of lenalidomide dose reductions on response. Clinical benefit was a composite endpoint defined as RBC-TI, transfusion reduction ≥ 4 units packed red blood cells, hemoglobin increase ≥ 1.5 g/dL, or cytogenetic response.ResultsThe rate of clinical benefit was higher with lenalidomide than with placebo (31.9% vs. 3.8%). The ratio of response (RBC-TI and clinical benefit) to risk (hematologic AEs) favored lenalidomide over placebo. Patients who underwent ≥ 1 lenalidomide dose reduction had a longer duration of treatment, received a higher cumulative dose, and were more likely to experience clinical benefit versus patients without dose reductions.ConclusionDespite the occurrence of hematologic AEs, the overall benefit-risk profile supported lenalidomide treatment. Appropriate management of hematologic AEs by dose reductions may help patients with myelodysplastic syndromes to remain on treatment and achieve clinical benefit.  相似文献   
28.
随着免疫检查点抑制剂(immune checkpoint inhibitors,ICPI)在国内外临床试验和应用中的逐步推广,越来越多的患者从免疫治疗中获得显著的疗效。其中抗程序细胞死亡蛋白1(programmed death-1,PD-1)及其配体(PD-1 ligand,PD-L1)免疫检查点抑制剂已被美国食品药品管理局(FDA)批准用于恶性黑色素瘤、转移性鳞状非小细胞肺癌、晚期肾癌、头颈鳞状细胞癌、尿路上皮癌等肿瘤的治疗。但PD-1/PD-L1单抗也会引起免疫相关性皮肤、消化道、肝脏、内分泌、肺部等器官的不良反应,皮肤毒性如皮疹、白癜风、皮肤干燥症等是最常见也是最早发生的不良反应。  相似文献   
29.
Clinicians have the choice of five approved tyrosine kinase inhibitors (TKI) to select from for chronic phase CML patients. The best frontline drug for each patient and decisions about if and when to change to another TKI or to stop therapy need to be considered in the context of the comorbidities present. These issues are explored in three illustrative cases. The predominant toxicity issue for all of the TKIs except imatinib is vascular occlusive events, so a systematic approach to assessing

Discussion

The excellent long-term outcomes achieved in most CML patients has led to a revision of the goals of therapy.13 While preventing progression to blast crisis remains an important goal, avoiding organ toxicity may be equally important, since deaths from causes other than CML are much more common than CML-related deaths. Patients most at risk of organ toxicity are those patients with comorbidities, particularly those patients with comorbidities that increase their risk of vascular events.

References

  • 1.Saußele S, Krauß MP, Hehlmann R, Lauseker M, Proetel U et al, Impact of comorbidities on overall survival in patients with chronic myeloid leukemia: results of the randomized CML Study IV. Blood. 2015;126:42-49.
  • 2.Hochhaus A, Saglio G, Hughes TP, Larson RA, Kim D-W et al. Long-term benefits and risks of frontline nilotinib vs imatinib for chronic myeloid leukemia in chronic phase: 5-year update of the randomized ENESTnd trial. Leukemia. 2016; 30:1044–1054.
  • 3.Castagnetti F, Gugliotta G, Breccia M,
  相似文献   
30.

Background

It has been reported that particulate matter (PM) is associated with cardiovascular diseases (CVD) while metabolic syndrome is also an important risk factor for CVD. However, few studies have investigated the epidemiological association between PM and metabolic syndrome.

Objective

To investigate the association between one-year exposure to PM with an aerodynamic diameter <2.5?μm (PM2.5) and the risk of metabolic syndrome in Korean adults without CVD.

Methods

Exposure to PM2.5 was assessed using a Community Multiscale Air Quality (CMAQ) model. Metabolic syndrome was defined by National Cholesterol Education Program Adult Treatment Panel III. Andersen and Gill model with time-varying covariates, considering recurrent events, was used to investigate the association between one-year average PM2.5 and the risk of incident metabolic syndrome in 119,998 adults from the national health screening cohort provided by Korea National Health Insurance from 2009 to 2013.

Results

Higher risk of metabolic syndrome, waist-based obesity, hypertension, hypertriglyceridemia, low HDL cholesterol, and hyperglycemia were significantly associated with a 10-μg/m3 increase in PM2.5 [adjusted hazard ratio (HR): 1.070, 1.510, 1.499, 1.468, 1.627 and 1.380, respectively]. In addition, the risk of metabolic syndrome associated with PM2.5 exposure was significant in the consistently obese group (obese at baseline and endpoint).

Conclusion

Exposure to one-year average PM2.5 is associated with an increased risk of metabolic syndrome and its components in adults without CVD. These associations are particularly prominent in the consistently obese group (obese at baseline and endpoint). Our findings indicate that PM2.5 affects the onset of MS and its components which may lead to increase the risk of CVD.  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