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   230篇
  免费   9篇
儿科学   15篇
妇产科学   12篇
基础医学   33篇
口腔科学   3篇
临床医学   21篇
内科学   38篇
神经病学   4篇
特种医学   6篇
外科学   81篇
预防医学   7篇
眼科学   3篇
药学   7篇
中国医学   1篇
肿瘤学   8篇
  2023年   3篇
  2022年   2篇
  2021年   3篇
  2020年   3篇
  2019年   4篇
  2018年   3篇
  2017年   3篇
  2016年   3篇
  2015年   3篇
  2014年   1篇
  2013年   5篇
  2012年   19篇
  2011年   12篇
  2010年   12篇
  2009年   9篇
  2008年   20篇
  2007年   24篇
  2006年   14篇
  2005年   24篇
  2004年   18篇
  2003年   14篇
  2002年   7篇
  2001年   2篇
  2000年   3篇
  1998年   1篇
  1996年   1篇
  1991年   3篇
  1990年   2篇
  1988年   1篇
  1983年   1篇
  1982年   3篇
  1981年   2篇
  1980年   2篇
  1979年   2篇
  1978年   1篇
  1977年   1篇
  1976年   3篇
  1970年   2篇
  1966年   1篇
  1927年   1篇
  1909年   1篇
排序方式: 共有239条查询结果,搜索用时 15 毫秒
211.

Aim

The aim of this study is to evaluate the extent of myocardial injury by cardiac biomarkers during prolonged targeted temperature management of 24 hours vs 48 hours after out-of-hospital cardiac arrest.

Methods

This randomized Scandinavian multicenter study compares the extent of myocardial injury quantified by area under the curve (AUC) of cardiac biomarkers during prolonged targeted temperature management at 33°C ± 1°C of 24 hours and 48 hours, respectively. Through a period of 2.5 years, 161 comatose out-of-hospital cardiac arrest patients were randomized to targeted temperature management for 24 hours (n = 77) or 48 hours (n = 84). The AUC was calculated using both high-sensitivity cardiac troponin T (hs-cTnTAUC) and creatine kinase-myocardial band (CK-MBAUC) that were based upon measurements of these biomarkers every 6 hours upon admission until 96 hours after reaching target temperature.

Results

The median hs-cTnTAUC of 33,827 ng/L/h (interquartile range [IQR] 11,366-117,690) of targeted temperature management at 24 hours did not differ significantly from that of 28,973 ng/L/h (IQR 10,656-163,655) at 48 hours. In contrast, the median CK-MBAUC of 1829 μg/L/h (IQR 800-6799) during targeted temperature management at 24 hours was significantly lower than that of 2428 μg/L/h (IQR 1163-10,906) within targeted temperature management at 48 hours, P <.05.

Conclusion

This study of comatose out-of-hospital cardiac arrest survivors showed no difference between the extents of myocardial injury estimated by hs-cTnTAUC of prolonged targeted temperature management of 48 hours vs 24 hours, although the CK-MBAUC was significantly higher during 48 hours vs 24 hours. Hence, it seems unlikely that the duration of targeted temperature management has a beneficial effect on the extent of myocardial injury after out-of-hospital cardiac arrest, and may even have a worsening effect.  相似文献   
212.
213.

Objective

To assess inter-rater agreement on EEG-reactivity (EEG-R) in comatose patients and compare it with a quantitative method (QEEG-R).

Methods

Six 30-s stimulation epochs (noxious, visual and auditory) were performed during EEG on 19 neurosurgical and 11 cardiac arrest patients. Six experts analysed EEGs for reactivity using their habitual methods. QEEG-R was defined as present if ≥2/6 epochs were reactive (stimulation/rest power ratio exceeding noise level). Three-months patient outcome was assessed by the Cerebral Performance Category Score (CPC) dichotomized in good (1–2) or poor (3–5).

Results

Agreement among experts on overall EEG-R varied from 53% to 83% (κ: 0.05–0.64) and reached 100% (κ: 1) between two QEEG-R calculators. For the experts, absence of EEG-R yielded sensitivities for poor outcome between 40–85% and specificities between 20–90%, for QEEG-R sensitivity was 40% (CI: 23–68%) and specificity 100% (CI: 69–100%).

Conclusions

There is a large inter-rater variation among experts on EEG-R assessment in comatose patients. QEEG-R is a promising objective prognostic parameter with low inter-rater variation and a high specificity for prediction of poor outcome.

Significance

Clinicians should be cautious when using the traditional, qualitative method, in particular in end-of-life decisions. Implementation of the quantitative method in clinical practice may improve reliability of reactivity assessments.  相似文献   
214.
OBJECTIVE: To assess fertilization, pregnancy, and miscarriage rates after intracytoplasmic sperm injection (ICSI) with epididymal or testicular spermatozoa from different types of azoospermia. DESIGN: Retrospective study. SETTING: Academic medical center and private fertility center. PATIENT(S): Two hundred twelve patients underwent 257 ICSI cycles. INTERVENTION(S): Cycles of ICSI were divided into four groups according to the etiology of azoospermia: A (nonobstruction), B (postvasectomy), C (congenital obstruction), and D (obstruction due to infection). Testicular sperm aspiration and percutaneous epididymal sperm aspiration were the sperm retrieval methods used for ICSI. MAIN OUTCOME MEASURE(S): Fertilization, pregnancy, and miscarriage rates. RESULT(S): Normal fertilization rates were higher in groups C (67.7%) and B (64.1%) compared with groups A (47.3%) and D (58.9%). Although lower pregnancy rates were seen in group A, no statistical differences were detected among groups. However, the miscarriage rate was higher in group A (45.6%) compared with groups B (25.25%), C (24%), and D (22.58%). CONCLUSION(S): Although no differences were detected in the pregnancy rates across groups, fertilization and implantation rates were higher in patients with congenital obstruction of the seminal path. The pregnancy rate was higher and the miscarriage rate lower when epididymal sperm was used compared with testicular sperm.  相似文献   
215.
216.
OBJECTIVE: The purpose of this report is to evaluate the value of urinary hyaluronan (HA) as a maker of residual transitional cell carcinoma (TCC). PATIENTS AND METHODS: Urine samples were collected from 83 patients hospitalized for transurethral resection (TUR). Patient ages ranged from 36 to 86 years. Samples were taken both before and after surgery. HA analysis was performed using an "ELISA-like" fluorometric assay. RESULTS: Patients were divided into two groups: a control group whose previous diagnosis was negative for tumors (n=22) and another with positive diagnosis for tumors (n=61) which was further sub-divided into with and without residual tumor. After the second procedure 47 individuals did not display residual tumor, whereas 14 (23%) did. The average HA in the control group was 8.3 microg/L pre- and 7.1 post-operatively, hence, no change occurred (p=0.471). In the group with TCC patients, the HA dropped from 885.5 microg/L to 215.3 microg/L with residual tumors and from 234.3 microg/L to 11.2 microg/L for those without residual tumor. Using a cut-off value of 20 microg/L, the sensitivity to detect residual tumor is 92.9% and specificity is 83%. CONCLUSION: HA in addition to being one of the best markers for the initial evaluation of bladder carcinoma can be used to determine the presence of a residual tumor. This is associated with poor prognosis.  相似文献   
217.
218.
219.
220.
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