全文获取类型
| 收费全文 | 2611920篇 |
| 免费 | 169963篇 |
| 国内免费 | 7492篇 |
专业分类
| 耳鼻咽喉 | 34450篇 |
| 儿科学 | 85377篇 |
| 妇产科学 | 71669篇 |
| 基础医学 | 364744篇 |
| 口腔科学 | 69813篇 |
| 临床医学 | 235469篇 |
| 内科学 | 517449篇 |
| 皮肤病学 | 62647篇 |
| 神经病学 | 214433篇 |
| 特种医学 | 100059篇 |
| 外国民族医学 | 736篇 |
| 外科学 | 387082篇 |
| 综合类 | 50470篇 |
| 现状与发展 | 5篇 |
| 一般理论 | 972篇 |
| 预防医学 | 197024篇 |
| 眼科学 | 56945篇 |
| 药学 | 188609篇 |
| 65篇 | |
| 中国医学 | 5350篇 |
| 肿瘤学 | 146007篇 |
出版年
| 2021年 | 20566篇 |
| 2019年 | 21467篇 |
| 2018年 | 29495篇 |
| 2017年 | 22767篇 |
| 2016年 | 26431篇 |
| 2015年 | 29638篇 |
| 2014年 | 40619篇 |
| 2013年 | 60684篇 |
| 2012年 | 80514篇 |
| 2011年 | 84837篇 |
| 2010年 | 51208篇 |
| 2009年 | 49336篇 |
| 2008年 | 79327篇 |
| 2007年 | 84120篇 |
| 2006年 | 85861篇 |
| 2005年 | 82047篇 |
| 2004年 | 78995篇 |
| 2003年 | 76298篇 |
| 2002年 | 73565篇 |
| 2001年 | 128451篇 |
| 2000年 | 131367篇 |
| 1999年 | 110530篇 |
| 1998年 | 31294篇 |
| 1997年 | 27959篇 |
| 1996年 | 28248篇 |
| 1995年 | 27420篇 |
| 1994年 | 25098篇 |
| 1993年 | 23457篇 |
| 1992年 | 85182篇 |
| 1991年 | 81579篇 |
| 1990年 | 78802篇 |
| 1989年 | 76076篇 |
| 1988年 | 69489篇 |
| 1987年 | 68005篇 |
| 1986年 | 63555篇 |
| 1985年 | 60528篇 |
| 1984年 | 44958篇 |
| 1983年 | 37957篇 |
| 1982年 | 22471篇 |
| 1981年 | 19995篇 |
| 1979年 | 38966篇 |
| 1978年 | 27448篇 |
| 1977年 | 23259篇 |
| 1976年 | 21507篇 |
| 1975年 | 22831篇 |
| 1974年 | 26798篇 |
| 1973年 | 25384篇 |
| 1972年 | 23761篇 |
| 1971年 | 21958篇 |
| 1970年 | 20190篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
11.
M. Iachina P.M. Ljungdalh R.G. Sørensen L. Kaerlev J. Blaakær O. Trosko N. Qvist B.M. Nørgård 《Clinical oncology (Royal College of Radiologists (Great Britain))》2019,31(2):115-123
Aims
To examine the influence of pre-existing psychiatric disorder on the choice of treatment in patients with gynaecological cancer.Materials and methods
The analyses were based on all patients who underwent surgical treatment for endometrial, ovarian or cervical cancer who were registered in the Danish Gynecological Cancer Database in the years 2007–2014 (3059 patients with ovarian cancer, 5100 patients with endometrial cancer and 1150 with cervical cancer). Logistic regression model and Cox regression model, adjusted for relevant confounders, were used to estimate the effect of pre-existing psychiatric disorder on the course of cancer treatment. Our outcomes were (i) presurgical oncological treatment, (ii) macroradical surgery for patients with ovarian cancer, (iii) radiation/chemotherapy within 30 days and 100 days after surgery and (iv) time from surgery to first oncological treatment.Results
In the group of patients with ovarian cancer, more patients with a psychiatric disorder received macroradical surgery versus patients without a psychiatric disorder, corresponding to an adjusted odds ratio of 1.24 (95% confidence interval 0.62–2.41) and the chance for having oncological treatment within 100 days was odds ratio = 1.26 (95% confidence interval 0.77–2.10). As for patients with endometrial cancer, all outcome estimates were close to unity. The adjusted odds ratio for oncological treatment within 30 days after surgery in patients with cervical cancer with a history of psychiatric disorder was 0.20 (95% confidence interval 0.03–1.54).Conclusions
We did not find any significant differences in the treatment of ovarian and endometrial cancer in patients with pre-existing psychiatric diagnoses. When it comes to oncological treatment, we suggest that increased attention should be paid to patients with cervical cancer having a pre-existing psychiatric diagnosis. 相似文献12.
Background
Total knee arthroplasty is a treatment option for debilitating arthritis. In the postoperative period, patients experience moderate to severe pain affecting the rehabilitation, hospital stay, and patient satisfaction. This study aims at utilizing current best evidence to determine whether adductor canal block (ACB) or periarticular injection (PAI) is a better modality for managing short-term postoperative pain and opioid consumption.Methods
Embase, MEDLINE, HealthStar, Emcare, and PubMed were searched for randomized controlled trials from 1946 to August 2018, for literature addressing the comparison of ACB and PAI for pain management in the setting of total knee arthroplasty. A systematic review and meta-analysis were performed.Results
Six studies were included in our meta-analysis. When examining the combined visual analog scale (VAS) pain values for each group, analysis demonstrated greater reduction in scores for the PAI group, and the difference was statistically significant (P = .001). When comparing the VAS scores of subgroups analyzed at specific periods in time, there was a trend toward lower VAS scores in subgroups analyzed at 24 hours and 48 hours postoperatively (at rest and at movement) in the PAI group. Overall opioid consumption was lower in the PAI group, with demonstrated statistical significance (P = .03). When comparing the postoperative subgroups, there was a trend toward decreased opioid use in the PAI group, with 13.25% less opioid use at 48 hours and 9.5% less opioid use at 24 hours.Conclusion
PAI could significantly improve postoperative pain and opioid consumption when compared with ACB. Additional, high-quality studies are required to further address this topic. 相似文献13.
14.
15.
16.
17.
Daniel J. Snyder Thomas R. Kroshus Aakash Keswani Evan B. Garden Karl M. Koenig Kevin J. Bozic David S. Jevsevar Jashvant Poeran Calin S. Moucha 《The Journal of arthroplasty》2019,34(4):613-618
Background
Nursing Home Compare (NHC) ratings, created and maintained by Medicare, are used by both hospitals and consumers to aid in the skilled nursing facility (SNF) selection process. To date, no studies have linked NHC ratings to actual episode-based outcomes. The purpose of this study was to evaluate whether NHC ratings are valid predictors of 90-day complications, readmission, and bundle costs for patients discharged to an SNF after primary total joint arthroplasty (TJA).Methods
All SNF-discharged primary TJA cases in 2017 at a multihospital academic health system were queried. Demographic, psychosocial, and clinical variables were manually extracted from the health record. Medicare NHC ratings were then collected for each SNF. For patients in the Medicare bundle, postacute and total bundle cost was extracted from claims.Results
Four hundred eighty-eight patients were discharged to a total of 105 unique SNFs. In multivariate analysis, overall NHC rating was not predictive of 90-day readmission/major complications, >75th percentile postacute cost, or 90-day bundle cost exceeding the target price. SNF health inspection and quality measure ratings were also not predictive of 90-day readmission/major complications or bundle performance. A higher SNF staffing rating was independently associated with a decreased odds for >75th percentile 90-day postacute spend (odds ratio, 0.58; P = .01) and a 90-day bundle cost exceeding the target price (odds ratio = 0.69; P = .02) but was similarly not predictive of 90-day readmission/complications.Conclusion
Results of our study suggest that Medicare's NHC tool is not a useful predictor of 90-day costs, complications, or readmissions for SNFs within our health system. 相似文献18.
19.
20.
N. V. Bashmakova G. N. Chistiakova I. A. Gazieva Y. M. Trapeznikova D. O. Mazurov 《Gynecological endocrinology》2015,31(10):31-33
AbstractThis study was undertaken to compare the concentrations of pro- and anti-angiogenic growth factors, nitric oxide (NO) stable metabolites in maternal serum and embryonic left ventricular (LV) isovolumic relaxation time (IRT, ms) during the first trimester in two groups of women: with pregnancy conceived by assisted reproductive technologies (ART, n?=?39) and normally conceived (control group, n?=?68) pregnancy. The concentration of vasoconstrictor endothelin 1 was 45.5 times more in ART than in control group. On the contrary, the concentrations of NO stable metabolites in ART were 1.9 times less than in control women. The assessment of angiogenic suppressors in ART women demonstrates the decrease in s-endoglin concentration was 1.6 times and in soluble receptor to vascular endothelial growth factor concentration was 2.0 times in comparison with control group. There was a significant increase in LV IRT in ART embryos in comparison to control ones. These data suggest significant changes in pro- anti-angiogenic factors balance and increase in vascular impedance in ART-conceived embryos. 相似文献