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   49100篇
  免费   2713篇
  国内免费   1085篇
耳鼻咽喉   590篇
儿科学   788篇
妇产科学   1682篇
基础医学   2326篇
口腔科学   765篇
临床医学   5290篇
内科学   12771篇
皮肤病学   243篇
神经病学   1185篇
特种医学   870篇
外国民族医学   2篇
外科学   8921篇
综合类   7031篇
现状与发展   2篇
一般理论   1篇
预防医学   3317篇
眼科学   1041篇
药学   3475篇
  107篇
中国医学   1579篇
肿瘤学   912篇
  2024年   69篇
  2023年   799篇
  2022年   1377篇
  2021年   2288篇
  2020年   2112篇
  2019年   1668篇
  2018年   1683篇
  2017年   1415篇
  2016年   1505篇
  2015年   1618篇
  2014年   3633篇
  2013年   3406篇
  2012年   2948篇
  2011年   3474篇
  2010年   2628篇
  2009年   2608篇
  2008年   2585篇
  2007年   2437篇
  2006年   2139篇
  2005年   1789篇
  2004年   1488篇
  2003年   1255篇
  2002年   954篇
  2001年   872篇
  2000年   664篇
  1999年   576篇
  1998年   441篇
  1997年   425篇
  1996年   388篇
  1995年   340篇
  1994年   336篇
  1993年   305篇
  1992年   313篇
  1991年   239篇
  1990年   207篇
  1989年   219篇
  1988年   210篇
  1987年   170篇
  1986年   139篇
  1985年   218篇
  1984年   156篇
  1983年   89篇
  1982年   129篇
  1981年   103篇
  1980年   79篇
  1979年   67篇
  1978年   68篇
  1977年   52篇
  1976年   34篇
  1975年   34篇
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
41.
42.
ObjectiveCambodian Americans have complex, interrelated and persistent medical and mental health problems stemming from genocide and the social determinants of health. We examined changes in multiple domains of self-reported health outcomes from a diabetes prevention trial. Methods: Cambodian Americans with depression and high risk for diabetes (n = 188) were randomized to one of three community health worker interventions: lifestyle vs lifestyle plus medication therapy management vs social services. Assessments were at baseline, 12- and 15-months. Results: The typical participant was 55 years old, female, earned below $20,000 annually, and had 7 years of education. About one-third were taking antidepressant medication and over half had elevated depressive symptoms. Relative to social services, lifestyle and lifestyle plus medication therapy management were both similarly effective at increasing diabetes knowledge, nutrition habits, sleep quality and decreasing pain; 2) lifestyle alone was superior to social services for self-reported health; and, 3) all three groups showed improved anxiety and insomnia. There were no effects on physical activity or physical functioning. Conclusion: Community health worker interventions have multiple benefits beyond delaying diabetes. Practice Implications: Health promotion programs that are designed and delivered appropriately can impact even hard to reach and hard to treat groups.  相似文献   
43.
IntroductionTranssphenoidal surgical removal is the preferred treatment of most pituitary adenomas. Postoperative cerebrospinal fluid (CSF) leakage is the leading cause of morbidity after this procedure, with an incidence rate that varies from 0,5-15% in the main published series.ObjectivesThe primary objective of this study was to establish the incidence of postoperative CSF leakage in a sample of surgeries performed at the University Hospital of La Ribera by the same surgical team. The secondary objectives were to: ascertain the distinctive features between patients with and without postoperative CSF leakage, identify risk factors for their development, evaluate the relationship between the surgical technique for closing the sella turcica and the onset of postoperative CSF leakage and evaluate different treatment regimens for this complication.MethodsThe data of 302 consecutive transsphenoidal surgical procedures for pituitary adenoma removal which were performed between 1999 and 2017 were retrospectively reviewed.Results and conclusionsThe incidence of postoperative CSF leakage in our series was 2,3% (in accordance with similar published studies). It was possible to correlate intraoperative CSF leakage with two variables: pituitary macroadenoma and tumors with suprasellar extension (P < .005). This correlation did not exist for postoperative CSF leakage. We found a statistically significant correlation between intraoperative and postoperative CSF leakage (P < .005). Due to the low incidence of postoperative CSF leakage in our series, it was not possible to identify risk factors for its development.  相似文献   
44.
目的探究糖化血红蛋白在糖尿病(DM)诊断中的应用价值。方法选取该院收治的36例糖尿病(DM)患者作为观察组,时间区间为2019年10月—2020年10月,实施糖化血红蛋白展开筛查和诊断,同时选择36名无糖尿病的健康者为对照组,分析并发症发生率、血糖指标、生活质量、心理状态评分等情况。结果观察组的空腹血糖、糖化血红蛋白和餐后2 h血糖的指标均高于对照组,差异有统计学意义(P<0.05);观察组经糖化血红蛋白展开筛查和诊断后,发现其各项生活质量评分均高于筛查诊断前,差异有统计学意义(P<0.05)。结论针对糖尿病(DM)患者,采用糖化血红蛋白展开筛查和诊断,可有效反映患者血糖改变情况,进一步提升临床上患者疾病诊断准确性,改善其不良负性心理情绪,提供可靠的参考资料,同时显著改善患者的生活质量,安全有效,具有临床应用价值。  相似文献   
45.
46.
47.
BackgroundStudies indicate the intrinsic relationship between sarcopenia and diabetes mellitus (DM) pathophysiological mechanisms. Changes in insulin and muscular metabolism are features of diabetic patients and can interact as sarcopenic accelerators. Conversely, sarcopenic patients feature lower glucose tolerance and higher serum insulin levels, predisposing them to DM.ObjectiveTo study the association between sarcopenia and DM in a community-dwelling elderly population of the Amazon region.MethodsCross-sectional study, performed in Belém, Brazil, with 1078 patients aged above 60 years old from the Viver Mais Project (VMP). The definition of sarcopenia was based in the European Working Group on Sarcopenia in Older People (EWGSOP). Calf circumference >31 cm was considered normal, muscle strength was discriminated by BMI and measured with the hand grip test, and gait speed <0.8 m/s configured low performance. DM was diagnosed when reported by the patient or medical form, use of hypoglycemic medications/insulin and in the presence of fasting glucose >126 mg/dl or glycated hemoglobin (HbA1c) >6.5% on two occasions. Other medical and socio-demographic data were extracted from medical forms.ResultsThe frequency of sarcopenia was 9.4%, while DM was present in 36.87% of the patients, and had an increased occurrence in the sarcopenic group. Female sex, advanced age, DM, coronary insufficiency, osteoporosis, body mass index, waist circumference, triglycerides and functionality were associated with sarcopenia. In multivariate analysis, sarcopenia remained strongly associated with DM (OR: 3.208, 95%CI: 1.784–5.769).ConclusionThis study describes strong and independent association between sarcopenia and DM. To further clarify these findings, broader prospective cohorts are necessary.  相似文献   
48.
目的研究辨证分型联合西药治疗免疫球蛋白a(Ig A)肾病的临床效果。方法选取收治的74例Ig A肾病患者,采用均衡分组法分为西药组和联合组,各37例。西药组采用氯沙坦钾片治疗,联合组辅以辨证分型治疗,治疗6个月后开展随访观察疗效。结果联合组治疗总有效率94.59%高于西药组的64.86%,联合组并发症发生率2.70%低于西药组的21.62%,联合组不良反应发生率2.70%低于西药组的24.32%,对比差异有统计学意义(P<0.05)。治疗后,联合组血肌酐高于西药组和治疗前,尿红细胞、尿蛋白指标低于西药组和治疗前,对比有统计学意义(P<0.05)。结论辨证分型联合西药治疗Ig A肾病的临床效果显著,可降低并发症及不良反应发生风险,改善其血液指标,具有较高临床推广价值。  相似文献   
49.
目的观察重灸中脘穴对脾胃虚寒型2型糖尿病胃轻瘫患者胃肠激素、胃动力学的影响。方法选取符合纳入标准的88例脾胃虚寒型糖尿病胃轻瘫患者,按随机数字表法分为治疗组和对照组,每组44例。对照组采用常规药物治疗,治疗组采用重灸中脘穴治疗。疗程结束后记录并对比分析两组临床疗效、胃肠激素[胃泌素(GAS)、胃动素(MTL)]、胃动力学(胃收缩频率、胃排空时间、胃排空率)、主要临床症状评分等变化。结果治疗组临床疗效明显优于对照组,差异具有统计学意义(P<0.05);两组治疗后GAS、MTL均明显优于治疗前(P<0.05),且治疗组明显优于对照组(P<0.05);两组治疗后胃收缩频率、胃排空时间、胃排空率均明显优于治疗前(P<0.05),且治疗组明显优于对照组(P<0.05);两组治疗后主要临床症状评分均明显优于治疗前(P<0.05),且治疗组明显优于对照组(P<0.05)。结论在常规药物治疗基础上重灸中脘穴治疗脾胃虚寒型2型糖尿病胃轻瘫,可调节胃肠激素,改善胃肠动力,促进胃肠功能恢复。  相似文献   
50.
The Impella 5.0, a percutaneously inserted left ventricular assist device, has been used to support patients who have severe heart failure or who are undergoing high-risk percutaneous coronary intervention. We report our surgical placement of the Impella 5.0, through a graft sewn to the aorta, to unload the left ventricle of a 59-year-old man who was undergoing venoarterial extracorporeal membrane oxygenation for postcardiotomy shock. The patient underwent successful placement of a long-term left ventricular assist device before his discharge from the hospital. The versatility of the Impella 5.0 is exemplified in this patient who was successfully bridged to long-term support.  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