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   376篇
  免费   15篇
  国内免费   1篇
耳鼻咽喉   1篇
儿科学   10篇
妇产科学   10篇
基础医学   32篇
口腔科学   58篇
临床医学   25篇
内科学   54篇
皮肤病学   17篇
神经病学   54篇
特种医学   25篇
外科学   36篇
综合类   2篇
预防医学   49篇
眼科学   5篇
药学   8篇
肿瘤学   6篇
  2023年   6篇
  2022年   7篇
  2021年   9篇
  2020年   6篇
  2019年   5篇
  2018年   7篇
  2017年   5篇
  2016年   6篇
  2015年   6篇
  2014年   10篇
  2013年   6篇
  2012年   18篇
  2011年   21篇
  2010年   8篇
  2009年   16篇
  2008年   15篇
  2007年   10篇
  2006年   12篇
  2005年   12篇
  2004年   15篇
  2003年   25篇
  2002年   10篇
  2001年   9篇
  2000年   11篇
  1999年   9篇
  1998年   13篇
  1997年   10篇
  1996年   10篇
  1995年   10篇
  1994年   5篇
  1993年   5篇
  1992年   7篇
  1991年   13篇
  1990年   8篇
  1989年   9篇
  1988年   4篇
  1987年   5篇
  1986年   4篇
  1982年   3篇
  1980年   1篇
  1979年   2篇
  1978年   4篇
  1977年   1篇
  1976年   1篇
  1975年   3篇
  1973年   3篇
  1972年   1篇
  1971年   1篇
  1967年   1篇
  1966年   1篇
排序方式: 共有392条查询结果,搜索用时 15 毫秒
91.
Reported here is the case of a patient suffering from hemodynamically significant bradycardia in which the use of transcutaneous cardiac pacing resulted in successful resuscitation, obviating the need for invasive pacing. During pacing, intra-arterial recordings of blood pressure demonstrated higher pulse pressures for paced beats than for the patient's own escape beats. Recent data regarding the use of non-invasive transcutaneous cardiac pacing is also reviewed.  相似文献   
92.
The COVID-19 pandemic has brought about various restrictions around the world, and its impact on healthcare has been enormous: RDNs have had to shift from in-person interactions with clients to telenutrition consultations, encountering obstacles. We designed the first survey to investigate the changes in RDN practices related to telenutrition provision after the onset of the pandemic through an online survey in Italy. Four hundred and thirty-six responses were analyzed. Before the pandemic, only 16% of Italian RDNs provided telenutrition; this percentage increased significantly up to 63% (p < 0.001). Among patients, the lack of interest in accessing telenutrition (30.9%) and the Internet (16.7%) were the most frequently reported barriers. Among RDNs, one of the main obstacles was their inability to conduct nutritional evaluation or monitoring activities (24.4%). Our survey indicated that increased adoption of telenutrition can be a valid, safe alternative to face-to-face visits. Telenutrition was mainly used by young RDNs (20–39 years) with fewer years of professional experience (0–20 years) and master’s degrees. Remote nutrition can enable RDNs to maintain normal workloads and provide patients with uninterrupted access to nutritional healthcare. It is important that RDNs using telemedicine resources possess the ability to provide high-quality, efficient, and secure services using evidence-based guidance.  相似文献   
93.
94.
95.

1 Introduction

Alveolar ridge preservation (ARP) techniques aim to reduce resorption after tooth extraction. The combination of a graft material covered with a resorbable membrane represents one of the most common strategies performed in the clinical practice. The aim of this systematic review is to analyze evidence regarding potential benefits of ARP procedures performed with allogenic/xenogenic grafts in combination with a resorbable membrane coverage in comparison with spontaneous healing.

2 Methods

Electronic databases were screened independently to select studies suitable for inclusion in this review. Horizontal ridge width reduction (HRWR) and vertical ridge height reduction (VRHR) were investigated as primary outcomes and volume changes (VC) as a secondary outcome. Meta‐analysis was performed using the inverse of variance test with a random effect model. Adjustment for Type I and II errors and analysis of the power of evidence was performed with trial sequential analysis (TSA).

3 Results

Seven studies met the inclusion criteria and were included in the quantitative synthesis. Meta‐analysis revealed that the combination therapy resulted in a lower rate of resorption for both HRWR (?2.19 mm, 95% confidence interval [CI]: ?2.67 to ?1.71 mm) and VRHR (?1.72 mm, 95% CI: ?2.14 to ?1.30 mm). For VC no meta‐analysis was performed due to insufficient data. Analysis of the power of the evidence performed with TSA showed that the number of both studies and sockets analyzed is sufficient to validate such findings, despite the high rate of heterogeneity.

4 Conclusions

Use of bone graft covered by a resorbable membrane can decrease the rate of alveolar ridge horizontal and vertical resorption after tooth extraction. The power and reliability of the evidence is strong enough to confirm the above‐mentioned findings, despite the high rate of heterogeneity of included studies.  相似文献   
96.
High genetic heterogeneity in the human leukocyte antigen (HLA) increases the likelihood of efficient immune response to pathogens and tumours. As measure of HLA diversity, HLA evolutionary divergence (HED) has been shown to predict the response of tumours to immunotherapy and haematopoietic stem cell transplantation (HSCT) in adults. We retrospectively investigated the association of HED with outcomes of 153 paediatric/young adults patients, treated for malignant disorders with HSCT from 9–10/10 HLA-matched unrelated donors. HED was calculated as pairwise genetic distance between alleles in patient HLA-A, -B, -C, -DRB1, -DQB1 and -DPB1, using the locus median to stratify patients with ‘high’ or ‘low’ HED. Patients with high HED-B and -DRB1 showed significantly improved disease-free survival (DFS), especially when combined (70.8% vs 53.7% p = 0.008). High HED-B + -DRB1 was also associated with improved overall survival (OS) (82.1 vs 66.4% p = 0.014), and concomitant reduction of non-relapse-mortality (5.1% vs 21.1% p = 0.006). The impact on OS and DFS of combined HED-B + -DRB1 was confirmed in multivariate analysis [hazard ratio (HR) 0.39, p = 0.009; and HR 0.45, p = 0.007 respectively]. Only high HED scores for HLA-DPB1 were associated, in univariate analysis, with reduced incidence of relapse (15.9% vs 31.1%, p = 0.03). These results support HED as prognostic marker in allogeneic HSCT and, if confirmed in larger cohorts, would allow its use to inform clinical risk and potentially influence clinical practice.  相似文献   
97.
Patients with pancreaticobiliary pain or idiopathic pancreatitis have been classified as having definitive (type I), presumptive (type II), or possible (type III) sphincter of Oddi dysfunction (SOD) based on clinical, laboratory, and ERCP data. This study was undertaken to determine the frequency of abnormal sphincter of Oddi manometry (SOM) when patients are classified by this system. Two hundred and thirteen patients with pancreaticobiliary pain were evaluated clinically; SOM, ERCP, and ductal contrast drainage time tests were performed. For biliary types I, II, and III, the frequency of abnormal SOM was 85.7%, 55.1%, and 28.1%, respectively. Similarly, for pancreatic types I, II, and III, an elevated basal sphincter pressure occurred in 92.3%, 58.2%, and 35.1%, respectively. When patients with an abnormal basal sphincter pressure were characterized by the magnitude of the elevation, the manometric profiles were similar for types I, II, and III. These data suggest that elevated sphincter pressure occurs more frequently in type III patients than previously reported, and supports consideration of SOM when evaluating and treating type II and type III patients.  相似文献   
98.
Low-cost, Office-Based, Screening Colonoscopy   总被引:8,自引:0,他引:8  
Objectives: Performing full colonoscopy at regular intervals and removing lesions at an early stage might significantly lower the incidence and mortality of colorectal cancer. Such a program must be inexpensive, safe, and time-efficient. Methods: Screening colonoscopy was performed on 639 patients. For a normal examination, the physician's time is limited to giving the medication for conscious sedation, performing the colonoscopy, and completing a written report form. The total charge for a normal screening colonoscopy is $150. Results: Adenomatous and/or hyperplastic polyps were detected in 218 patients (34.1%). One hundred sixty adenomatous and 134 hyperplastic polyps were removed. Forty-eight percent (48.1%) of the adenomatous and 21.6% of the hyperplastic polyps were ahove the sigmoid colon. Six adenocarcinomas were detected in five patients. One patient had a delayed hleeding episode requiring no transfusion or therapeutic intervention, and one patient had a "post-polypectomy syndrome" requiring no therapeutic intervention. The average physician time in the endoscopy room for normal examinations was 18 min. Conclusions: Screening colonoscopy can he safely performed in an office facility. Physician time with the patient should be limited to allow a low cost that compares favorably with screening costs for other malignancies. Long-term studies to assess the capability of screening colonoscopy to lower mortality from colorectal cancer should continue.  相似文献   
99.
Gender accounts for important differences in the incidence and prevalence of a variety of age-related diseases. Considering people of far advanced age, demographic data document a clear-cut prevalence of females compared to males, suggesting that sex-specific mortality rates follow different trajectories during aging. In the present investigation, we report data from a nationwide study on Italian centenarians (a total of 1162 subjects), and from two studies on centenarians living in two distinct zones of Italy, i.e., the island of Sardinia (a total of 222 subjects) and the Mantova province (Northern Italy) (a total of 43 subjects). The female/male ratio was about 2:1 in Sardinia, 4:1 in the whole of Italy, and about 7:1 in the Mantova province. Thus, a complex interaction of environmental, historical and genetic factors, differently characterizing the various parts of Italy, likely plays an important role in determining the gender-specific probability of achieving longevity. Gender differences in the health status of centenarians are also reported, and an innovative score method to classify long-lived people in different health categories, according to clinical and functional parameters, is proposed. Our data indicate that not only is this selected group of people, as a whole, highly heterogeneous, but also that a marked gender difference exists, since male centenarians are less heterogeneous and more healthy than female centenarians. Immunological factors regarding the age-related increase in pro-inflammatory status, and the frequency of HLA ancestral haplotypes also show gender differences that likely contribute to the different strategies that men and women seem to follow to achieve longevity. Concerning the different impact of genetic factors on the probability of reaching the extreme limits of the human life-span, emerging evidence (regarding mtDNA haplogroups, Thyrosine Hydroxilase, and IL-6 genes) suggests that female longevity is less dependent on genetics than male longevity, and that female centenarians likely exploited a healthier life-style and more favorable environmental conditions, owing to gender-specific cultural and anthropological characteristics of the Italian society in the last 100 years.  相似文献   
100.
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