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   3840篇
  免费   299篇
  国内免费   9篇
耳鼻咽喉   47篇
儿科学   134篇
妇产科学   93篇
基础医学   502篇
口腔科学   16篇
临床医学   462篇
内科学   746篇
皮肤病学   48篇
神经病学   432篇
特种医学   94篇
外科学   463篇
综合类   64篇
一般理论   2篇
预防医学   500篇
眼科学   75篇
药学   225篇
  1篇
中国医学   1篇
肿瘤学   243篇
  2024年   5篇
  2023年   45篇
  2022年   78篇
  2021年   170篇
  2020年   98篇
  2019年   164篇
  2018年   184篇
  2017年   150篇
  2016年   120篇
  2015年   127篇
  2014年   158篇
  2013年   226篇
  2012年   322篇
  2011年   366篇
  2010年   195篇
  2009年   114篇
  2008年   242篇
  2007年   207篇
  2006年   156篇
  2005年   168篇
  2004年   137篇
  2003年   113篇
  2002年   95篇
  2001年   41篇
  2000年   54篇
  1999年   33篇
  1998年   16篇
  1997年   23篇
  1996年   23篇
  1995年   11篇
  1994年   13篇
  1993年   9篇
  1992年   25篇
  1991年   22篇
  1990年   27篇
  1989年   24篇
  1988年   18篇
  1987年   17篇
  1986年   19篇
  1985年   11篇
  1984年   9篇
  1983年   8篇
  1982年   6篇
  1981年   5篇
  1980年   5篇
  1979年   16篇
  1978年   11篇
  1974年   6篇
  1973年   9篇
  1972年   6篇
排序方式: 共有4148条查询结果,搜索用时 31 毫秒
991.
992.
993.
We report a case of aseptic meningitis thought to be associated with chronic sulindac use in a patient with osteoarthritis. The patient was hospitalized with an acute onset of headache, nuchal rigidity, nausea, and blurred vision. Brain imaging was unremarkable and a lumbar puncture revealed a lymphocytic pleocytosis. No infectious source was identified. The patient reported taking sulindac over the past year, it was discontinued, and symptoms promptly resolved. This case underscores the importance of obtaining a thorough drug history in conjunction with the knowledge of causative medications associated with aseptic meningitis. Given the widespread use of nonsteroidal anti-inflammatory drugs, clinicians must recognize that aseptic meningitis is a possible adverse effect of these medications.  相似文献   
994.
ABSTRACT

A geriatrics curriculum delivered to medical students was evaluated in this study. Students were instructed to review real patient cases, interview patients and caregivers, identify community resources to address problems, and present a final care plan. Authors evaluated the course feedback and final care plans submitted by students for evidence of learning in geriatric competencies. Students rated the efficacy of the course on a 5-point Likert scale as 3.70 for developing clinical reasoning skills and 3.69 for interdisciplinary teamwork skills. Assessment of an older adult with medical illness was rated as 3.87 and ability to perform mobility and functional assessment as 3.85. Reviews of written final care plans provided evidence of student learning across several different geriatric competencies such as falls, medication management, cognitive and behavior disorders, and self-care capacity. Assessment of the curriculum demonstrated that medical students achieved in-depth learning across multiple geriatric competencies through contact with real cases.  相似文献   
995.
996.
997.
998.

Background

An efficient cardiac rehabilitation programme (CRP) can improve the functional ability of patients after acute coronary syndrome (ACS).

Objective

To examine the effect of a CRP on parasympathetic reactivation and heart rate recovery (HRR) measured after a 6-min walk test (6MWT), and correlation with 6MWT distance and well-being after ACS.

Methods

Eleven normoweight patients after ACS (BMI < 25 kg/m2; 10 males; mean [SD] age 61 [9] years) underwent an 8-week CRP. Before (pre-) and at weeks 4 (W4) and 8 (W8) during the CRP, they performed a 6MWT on a treadmill, followed by 10-min of seated passive recovery, with HRR and HR variability (HRV) recordings. HRR was measured at 1, 3, 5 and 10 min after the 6MWT (HRR1, HRR3, HRR5, HRR10), then modelized by a mono-exponential function. Time-domain (square root of the mean of the sum of the squares of differences between adjacent normal R-R intervals [RMSSD]) and frequency-domain (with high- and low-frequency band powers) were used to analyse HRV. Participants completed a mental and physical well-being questionnaire at pre- and W8. Exhaustion after tests was assessed by the Borg scale. Pearson correlation was used to assess correlations.

Results

HRR3, HRR5 and HRR10 increased by 37%, 36% and 28%, respectively, between pre- and W8 (P < 0.05), and were positively correlated with change in 6MWT distance (r = 0.58, 0.66 and 0.76; P < 0.05). Percentage change in HRR3 was positively correlated with change in well-being (r = 0.70; P = 0.01). Parasympathic reactivation (RMSSD) was improved only during the first 30 sec of recovery (P = 0.04).

Conclusion

Among patients undergoing a CRP after ACS, increased HRR after a 6MWT, especially at 3 min, was positively correlated with 6MWT distance and improved well-being. HRR raw data seem more sensitive than post-exercise HRV analysis for monitoring functional and autonomic improvement after ACS.  相似文献   
999.
Since chikungunya virus (CHIKV) was introduced into the Americas in 2013, its geographic distribution has rapidly expanded. Of 119 serum samples collected in 2014 from febrile patients in southern Mexico, 79% were positive for CHIKV or IgM against CHIKV. Sequencing results confirmed CHIKV strains closely related to Caribbean isolates.  相似文献   
1000.

PURPOSE

Timely outpatient follow-up has been promoted as a key strategy to reduce hospital readmissions, though one-half of patients readmitted within 30 days of hospital discharge do not have follow-up before the readmission. Guidance is needed to identify the optimal timing of hospital follow-up for patients with conditions of varying complexity.

METHODS

Using North Carolina Medicaid claims data for hospital-discharged patients from April 2012 through March 2013, we constructed variables indicating whether patients received follow-up visits within successive intervals and whether these patients were readmitted within 30 days. We constructed 7 clinical risk strata based on 3M Clinical Risk Groups (CRGs) and determined expected readmission rates within each CRG. We applied survival modeling to identify groups that appear to benefit from outpatient follow-up within 3, 7, 14, 21, and 30 days after discharge.

RESULTS

The final study sample included 44,473 Medicaid recipients with 65,085 qualifying discharges. The benefit of early follow-up varied according to baseline readmission risk. For example, follow-up within 14 days after discharge was associated with 1.5%-point reduction in readmissions in the lowest risk strata (P <.001) and a 19.1%-point reduction in the highest risk strata (P <.001). Follow-up within 7 days was associated with meaningful reductions in readmission risk for patients with multiple chronic conditions and a greater than 20% baseline risk of readmission, a group that represented 24% of discharged patients.

CONCLUSIONS

Most patients do not meaningfully benefit from early outpatient follow-up. Transitional care resources would be best allocated toward ensuring that highest risk patients receive follow-up within 7 days.  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