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   3731篇
  免费   192篇
  国内免费   31篇
耳鼻咽喉   13篇
儿科学   219篇
妇产科学   39篇
基础医学   219篇
口腔科学   6篇
临床医学   663篇
内科学   613篇
皮肤病学   6篇
神经病学   48篇
特种医学   148篇
外科学   148篇
综合类   741篇
预防医学   444篇
眼科学   1篇
药学   460篇
  7篇
中国医学   157篇
肿瘤学   22篇
  2024年   6篇
  2023年   54篇
  2022年   123篇
  2021年   194篇
  2020年   258篇
  2019年   94篇
  2018年   111篇
  2017年   105篇
  2016年   152篇
  2015年   116篇
  2014年   307篇
  2013年   246篇
  2012年   256篇
  2011年   279篇
  2010年   243篇
  2009年   159篇
  2008年   163篇
  2007年   167篇
  2006年   169篇
  2005年   140篇
  2004年   124篇
  2003年   123篇
  2002年   61篇
  2001年   49篇
  2000年   36篇
  1999年   35篇
  1998年   29篇
  1997年   23篇
  1996年   12篇
  1995年   19篇
  1994年   18篇
  1993年   10篇
  1992年   9篇
  1991年   6篇
  1990年   12篇
  1989年   6篇
  1988年   6篇
  1987年   9篇
  1986年   9篇
  1985年   4篇
  1984年   1篇
  1983年   1篇
  1982年   2篇
  1981年   2篇
  1980年   2篇
  1979年   3篇
  1976年   1篇
排序方式: 共有3954条查询结果,搜索用时 109 毫秒
11.
12.
目的:观察“肺炎1号”治疗新型冠状病毒肺炎的临床疗效。方法:选取2020年2月17日至2020年3月15日湖北省中医院、监利县中医院、蕲春县人民医院、潜江市中医院、洪湖市中医医院、阳新县中医医院、浠水县中医院、大冶市中医医院、汉川市人民医院、武昌方舱医院收治的新型冠状病毒肺炎患者451例,采用“肺炎1号”联合西医常规治疗,观察“肺炎1号”对新型冠状病毒肺炎患者的临床症状、舌象、实验室检查结果及肺部CT情况。结果:共纳入451例患者,其中轻型21例,普通型378例,重型46例,危重型6例。疑似病例6例(1.33%),临床诊断病例168例(37.25%),确诊病例277例(61.42%)。治疗后与治疗前比较,患者发热、咳嗽、乏力主要症状发生率显著降低(P<0.05);恶寒、鼻塞、流涕、打喷嚏、咽部痒、咽痛、呼吸困难、胸闷、肌肉酸痛或关节疼痛、头晕头痛、纳差、恶心呕吐、腹胀、大便稀溏症状发生率显著改善(P<0.05);白细胞计数、中性粒细胞绝对值变化差异无统计学意义(P>0.05);淋巴细胞绝对值明显升高,差异有统计学意义(P<0.05);C反应蛋白、降钙素原明显降低,差异有统计学意义(P<0.05)。退热时间3(1~3.25)d。229例患者舌质由红或绛逐渐转为淡红,好转率为75.58%;177例患者白腻苔、厚腻苔、黄腻苔明显变薄,好转率为65.31%。新型冠状病毒核酸转阴时间为8(5,11)d。415例(92.02%)肺部CT明显好转,主要表现在病灶面积减小,变薄变淡。达到出院标准430例,临床治愈率95.34%;好转15例;无效3例;死亡3例(0.67%)。治疗过程中,未见明显不良反应,临床应用安全。结论:“肺炎1号”结合西医常规治疗对新型冠状病毒肺炎有较好的治疗作用,能够快速稳定病情,阻断轻型、普通型向重型、危重型转化;明显改善患者临床症状;较好促进肺部炎性反应吸收;使用安全可靠。  相似文献   
13.
IntroductionB-cell malignancies confer an increased risk of infection due to associated immune defects. Conflicting evidence exists on the risk of infection in patients receiving ibrutinib. We conducted a systematic review and meta-analysis to estimate relative risk of infection with ibrutinib in B-cell malignancies.MethodsA systematic search of Embase, Medline, Web of Science, Scopus, Cochrane Database of Systematic Reviews, Cochrane Central Register of Controlled Trials, European Union Clinical Trials Register, and ClinicalTrials.gov was performed through January 15, 2019, to identify randomized controlled trials comparing ibrutinib with other agents or placebo in B-cell malignancies. We pooled point estimates using the Der Simonian and Laird random-effects model. Statistical analyses were performed by Stata/SE 15.1.ResultsSeven studies randomizing 2167 patients were included in the final analysis. Treatment duration in studies ranged from 9.4 to 38.7 months. Ibrutinib was associated with a significantly increased risk of infection (any grade and grade 3-5) in patients with B-cell malignancies [pooled risk ratio (RR) = 1.34, 95% confidence interval [CI], 1.06-1.69, P = .015; and RR = 1.35, 95% CI, 1.05-1.74, P = .018, respectively]. In patients with chronic lymphocytic leukemia, a significantly increased risk of grade 3-5 infection was noted in the ibrutinib group [pooled RR = 1.24, 95% CI, 1.02-1.50, P = .028]. Incidences of pneumonia and upper respiratory tract infection were not significantly different between groups.ConclusionOur meta-analysis found that ibrutinib was associated with significantly higher risk of infections in patients with B-cell malignancies. Occurrence of major individual subtypes was not different between groups, possibly as a result of inconsistent reporting across studies.  相似文献   
14.
ObjectiveTo explore the relationship between gastrointestinal heat retention syndrome and the incidence of pneumonia and recurrent respiratory tract infections (RRTIs) in children.MethodsA prospective cohort study was conducted in the pediatric outpatient department of Beijing Dongfang Hospital. Children without respiratory tract infections (RTIs) were consecutively recruited according to the selection criteria. A semi-structured questionnaire was used to record traditional Chinese medicine (TCM) symptoms and demographic and physiological characteristics. Gastrointestinal heat retention syndrome was considered to be a predisposing factor and was diagnosed according to a scale with reliability and validity. The participants were followed up for 12 months. Participants and their parents or guardians were contacted via clinical interviews and telephone every 6 months. Episodes of pneumonia and RTIs were recorded in detail.ResultsA total of 420 children were included. Of participants, 370 (88.10%) were followed up for 12 months. The mean number of RTI episodes per participant was 5.37 (95% CI: 5.14 to 5.60). In total, 186 participants in the gastrointestinal heat retention syndrome group and 184 participants in the non-gastrointestinal heat retention syndrome group completed the 12-month follow-up period. The baseline of both groups was comparable. The incidence of RRTIs in children with gastrointestinal heat retention syndrome was 1.27 (95% CI: 1.01 to 1.59) times that in children without gastrointestinal heat retention syndrome. Logistic regression analysis revealed that abnormally increased appetite with frequent hunger, foul breath, dry stools, and dark red or purple fingerprints were positively correlated with the incidence of pneumonia. Irascibility and feverish feelings in the palms and soles were positively correlated with the occurrence of RRTI.ConclusionsGastrointestinal heat retention syndrome is a risk factor for RRTIs in children. Studies with larger sample sizes and longer follow-up time are warranted to confirm the degree of causal risk associated with RTIs.  相似文献   
15.
自2019年12月以来,以我国湖北武汉地区为中心,以人群集散辐射传播为特点,全国各地病例陆续出现增加。疫情发源地罹患患者早期以身热不扬、干咳气促、身楚乏力为主要症状,以脉濡缓、舌苔厚腻、胸部X线检查显示炎性反应性改变为特征的新型冠状病毒(COVID-19)感染性肺炎为主的新型传染病。疫情传入地的患者早期症状由于地域的不同,有所差异。各地传统中医、现代医学先后集体或个人出台了相关诊疗方法和建议方案。作为现代中医,按照习近平主席:“遵循中医发展规律,传承精华,守正创新”和“中西并重”的指示精神。为规范这一新型传染病“瘟疫”的认知和诊疗,综合相关资料,根据疫情演变规律,结合个人经验与体会,特此探讨COVID-19感染性肺炎的诊疗建议方案。  相似文献   
16.
目的:系统评价宣白承气汤单用及联合用药治疗肺炎痰热壅肺证的临床疗效。方法:检索CNKI、万方、CBM、PubMed等数据库,筛选宣白承气汤治疗肺炎的随机对照试验(RCT),运用Cochrane协作网偏倚风险评价工具进行文献质量评价,使用Revman 5.3 软件进行Meta分析。结果:最终纳入16项研究,共1393例患者,纳入文献质量不高。Meta分析结果表明,与单纯西医治疗相比,使用宣白承气汤可明显提高肺炎痰热壅肺证的临床总有效率[RR=1.29,95%,CI(1.22,1.36),P<0.00001],且亚组分析显示单用或联用宣白承气汤的组间差异无统计学意义; 可明显改善APACHE II评分、CPIS评分,明显降低炎症因子水平,改善中医证候积分。结论:宣白承气汤可有效治疗肺炎痰热壅肺证,但鉴于纳入临床研究在质量上存在一定局限性,得出的阳性结果仅作为临床诊疗的提示与参考,急需开展更多的高质量大规模的RCT来进一步验证。  相似文献   
17.
Interstitial lung disease (ILD) in children (chILD) is a heterogeneous group of rare respiratory disorders that are mostly chronic and associated with high morbidity and mortality. The pathogenesis of the various chILD is complex and the diseases share common features of inflammatory and fibrotic changes of the lung parenchyma that impair gas exchanges. The etiologies of chILD are numerous. In this review, we chose to classify them as ILD related to exposure/environment insults, ILD related to systemic and immunological diseases, ILD related to primary lung parenchyma dysfunctions and ILD specific to infancy. A growing part of the etiologic spectrum of chILD is being attributed to molecular defects. Currently, the main genetic mutations associated with chILD are identified in the surfactant genes SFTPA1, SFTPA2, SFTPB, SFTPC, ABCA3 and NKX2-1. Other genetic contributors include mutations in MARS, CSF2RA and CSF2RB in pulmonary alveolar proteinosis, and mutations in TMEM173 and COPA in specific auto-inflammatory forms of chILD. However, only few genotype-phenotype correlations could be identified so far. Herein, information is provided about the clinical presentation and the diagnosis approach of chILD. Despite improvements in patient management, the therapeutic strategies are still relying mostly on corticosteroids although specific therapies are emerging. Larger longitudinal cohorts of patients are being gathered through ongoing international collaborations to improve disease knowledge and targeted therapies. Thus, it is expected that children with ILD will be able to reach the adulthood transition in a better condition.  相似文献   
18.
19.
ObjectivesPneumonia is a frequent cause of hospitalization among nursing home (NH) residents, but little information is available as to how clinical presentation and other characteristics relate to hospitalization, and the differential use of antimicrobials based on hospitalization status. This study examined how hospitalized and nonhospitalized NH residents with pneumonia differ.DesignData from a 2-year prospective study of residents who participated in a randomized controlled trial.Setting and ParticipantsAll residents from 14 NHs in North Carolina followed for pneumonia over a 2-year period.MethodsClinical features, antimicrobial treatment, hospitalization, and demographic data on residents with a pneumonia diagnosis were abstracted from charts; NH information was obtained from NH administrators.ResultsA total of 509 pneumonia episodes were reported for 395 unique residents; the incidence was not higher in the winter months, and 28% were hospitalized. The likelihood of hospitalization did not differ by clinical characteristics except that residents with a respiratory rate >25 breaths per minute were more likely to be hospitalized. Being on hospice [odds ratio (OR) 3.3, 95% confidence interval (CI) 1.5–7.4] and not having dementia (OR 1.9, 95% CI 1.1–3.2) also related to increased likelihood of hospitalization. Fluoroquinolone (usually levofloxacin) monotherapy was the most common treatment (54%) in both settings, and ceftriaxone monotherapy varied by hospitalization status (7% of hospitalized vs 16% treated on-site). Approximately 36% of nonhospitalized residents received antimicrobials for more than 7 days.Conclusions/ImplicationsRespiratory rate is associated with hospitalization but was not documented for more than a quarter of residents, suggesting the clinical benefit of more consistently conducting this assessment. Differential hospitalization rates for persons with dementia and on hospice suggest that care is being tailored to individuals' wishes, but this assumption merits study, as does use of fluoroquinolones (due to side effects) and treatment duration (due to potential contribution to antibiotic resistance).  相似文献   
20.
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