全文获取类型
收费全文 | 259篇 |
免费 | 20篇 |
国内免费 | 3篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 4篇 |
基础医学 | 42篇 |
口腔科学 | 23篇 |
临床医学 | 8篇 |
内科学 | 70篇 |
皮肤病学 | 6篇 |
神经病学 | 17篇 |
特种医学 | 2篇 |
外科学 | 33篇 |
综合类 | 9篇 |
预防医学 | 17篇 |
眼科学 | 2篇 |
药学 | 15篇 |
中国医学 | 5篇 |
肿瘤学 | 26篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 13篇 |
2020年 | 6篇 |
2019年 | 8篇 |
2018年 | 11篇 |
2017年 | 10篇 |
2016年 | 7篇 |
2015年 | 8篇 |
2014年 | 6篇 |
2013年 | 8篇 |
2012年 | 23篇 |
2011年 | 22篇 |
2010年 | 7篇 |
2009年 | 5篇 |
2008年 | 15篇 |
2007年 | 11篇 |
2006年 | 6篇 |
2005年 | 6篇 |
2004年 | 10篇 |
2003年 | 8篇 |
2002年 | 8篇 |
2001年 | 12篇 |
2000年 | 12篇 |
1999年 | 8篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 9篇 |
1991年 | 12篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有282条查询结果,搜索用时 62 毫秒
1.
Bioterrorism 总被引:1,自引:0,他引:1
2.
It is known that oesophageal pain can imitate angina and also that non specific ECG changes, probably catecholamine mediated, can be similar to those due to true myocardial ischaemia. Both of these can therefore pose a problem for the diagnosis of angina pain due to cardiac ischaemia. We report a patient who had both of these conditions simultaneously, pain on exertion appearing as angina but due to oesophagitis, and "ischaemic" ECG changes due to catecholamines—a double mimic of myocardial ischaemia.
Full text
Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (1.7M), or click on a page image below to browse page by page.
4150 相似文献3.
Niti Shahi Ashwani K. Shahi Ryan Phillips Gabrielle Shirek Denis Bensard Steven L. Moulton 《Journal of pediatric surgery》2021,56(2):379-384
BackgroundThe principal triggers for intervention in the setting of pediatric blunt solid organ injury (BSOI) are declining hemoglobin values and hemodynamic instability. The clinical management of BSOI is, however, complex. We therefore hypothesized that state-of-art machine learning (computer-based) algorithms could be leveraged to discover new combinations of clinical variables that might herald the need for an escalation in care. We developed algorithms to predict the need for massive transfusion (MT), failure of non-operative management (NOM), mortality, and successful non-operative management without intervention, all within 4 hours of emergency department (ED) presentation.MethodsChildren (≤ 18 years) who sustained a BSOI (liver, spleen, and/or kidney) between 2009 and 2018 were identified in the trauma registry at a pediatric level 1 trauma center. Deep learning models were developed using clinical values [vital signs, shock index-pediatric adjusted (SIPA), organ injured, and blood products received], laboratory results [hemoglobin, base deficit, INR, lactate, thromboelastography (TEG)], and imaging findings [focused assessment with sonography in trauma (FAST) and grade of injury on computed tomography scan] from pre-hospital to ED settings for prediction of MT, failure of NOM, mortality, and successful NOM without intervention. Sensitivity, specificity, accuracy, and area under the receiver operating characteristic curve (AUC) were used to evaluate each model's performance.ResultsA total of 477 patients were included, of which 5.7% required MT (27/477), 7.2% failed NOM (34/477), 4.4% died (21/477), and 89.1% had successful NOM (425/477). The accuracy of the models in the validation set was as follows: MT (90.5%), failure of NOM (83.8%), mortality (91.9%), and successful NOM without intervention (90.3%). Serial vital signs, the grade of organ injury, hemoglobin, and positive FAST had low correlations with outcomes.ConclusionDeep learning-based models using a combination of clinical, laboratory and radiographic features can predict the need for emergent intervention (MT, angioembolization, or operative management) and mortality with high accuracy and sensitivity using data available in the first 4 hours of admission. Further research is needed to externally validate and determine the feasibility of prospectively applying this framework to improve care and outcomes.Level of EvidenceIIIStudy TypeRetrospective comparative study (Prognosis/Care Management). 相似文献
4.
Massive obesity is associated with serious co-morbidities. After failure of extensive conservative measures, surgical procedures have developed as the only successful method for sustained weight loss. Criteria for operation are: presence of serious diseases associated with morbid obesity; greater than 45 kg above ideal weight or body mass index greater than 40 kg/m2 for usually greater than 5 years; failure of sustained weight loss on extensive conservative regimens; commitment to lifelong follow-up; and acceptable operative risk. Angina pectoris itself is not a contraindication to these operations. Patients who do not quite meet the weight criteria may still be candidates for an obesity operation in certain instances, e.g., debilitating musculoskeletal pains in weight-bearing joints, diabetes, significant hypertension, reflux esophagitis, urinary stress incontinence. Although current operations result in lasting weight loss of greater than 50% of excess weight in the majority of patients, the surgical candidate must understand and accept the principles of the procedures, the potential for serious complications, the dietary necessities, and occasional failures. 相似文献
5.
Bizhan Helli Majid Mohammad Shahi Karim Mowla Mohammad Taha Jalali Hossein Khadem Haghighian 《Phytotherapy research : PTR》2019,33(9):2421-2428
Inflammation is one of the main characteristics of rheumatoid arthritis. Based on the antiinflammatory properties of sesame, this study was conducted to evaluate the sesamin supplement effects on serum levels of some proteolytic enzymes, inflammatory biomarkers, and clinical indices in women with rheumatoid arthritis. In this randomized, triple‐blind, placebo‐controlled clinical trial, 44 patients were randomly divided in intervention and control groups. Patients received 200‐mg/day sesamin supplement or placebo in the intervention and control group for 6 weeks. Serum levels of proteolytic enzymes (hyaluronidase, aggrecanase, and matrix metalloproteinases‐3) and inflammatory biomarkers (hs‐CRP, IL‐1β, IL‐6, TNF‐α, and cyclooxygenase‐2) were measured with enzyme‐linked immunosorbent assay method at the beginning and end of the study. After intervention, serum levels of hyaluronidase and matrix metalloproteinases‐3 decreased significantly in sesamin group. Also, serum levels of hs‐CRP, TNF‐α, and cyclooxygenase‐2 in intervention group were significantly decreased in intervention group compared with placebo group. Sesamin supplementation also caused a significant reduction in the number of tender joints and severity of pain in these patients. According to the results, it seems that the sesamin by reducing inflammatory mediators can relieve clinical symptoms and pathological changes that caused by inflammatory impairment in patients with rheumatoid arthritis. 相似文献
6.
Upendra Kaul Ripen K Gupta Kottaram K Haridas Saligrama S Ramesh Kamal K Sethi Balbir Singh Rajiv Agarwal Ram D Yadave Tapan Ghose Rakesh R Sapra Rajiv Bajaj Madhukar Shahi Ajit Bhagwat Pramod Kumar Omen P Mathews Pratik K Soni 《Catheterization and cardiovascular interventions》2002,57(4):497-503
The results of primary coronary stenting for acute myocardial infarction (AMI) have been reported to improve significantly with the concomitant administration of platelet glycoprotein IIb/IIIa inhibitor abciximab. There are, however, no data available with the use of eptifibatide, a more cost-effective, small-molecule GP IIb/IIIa blocker with a shorter half-life. In a prospective multicenter feasibility and efficacy study, we assigned 55 consecutive patients with AMI being taken up for primary stenting to receive eptifibatide just before the procedure (two boluses of 180 microg/kg 10 min apart and a 24-hr infusion of 2 microg/kg/min). Clinical outcomes were evaluated at 30 days after the procedure. The angiographic patency of the vessel with TIMI flow rates, TIMI myocardial perfusion (TMP) grade, and corrected TIMI frame counts were assessed at the end of procedure and before hospital discharge. At 30 days, the primary endpoint, a composite of death, myocardial infarction, and urgent target vessel revascularization (TVR) was seen in 12.7% of patients. The TIMI 3 and TMP grade 3 flow, which was seen in 93% and 86% of patient, respectively, at the end of the procedure, declined to 86% and 78%, respectively (P < 0.05) before hospital discharge. Corrected TIMI frame counts also decreased from 25.7 +/- 7.2 to 22.9 +/- 6.8 (P < 0.05). There were five (9.1%) instances of subacute thrombosis (SAT) presenting as AMI, needing urgent TVR in all, within 3-5 days of the primary procedure. No excessive bleeding complication, directly attributable to the use of eptifibatide, was observed. The study was terminated prematurely because of an unacceptable SAT rate. Administration of eptifibatide along with primary stenting for AMI is associated with a high TIMI 3 and TMP grade 3 flow acutely. However, these flows decline significantly before hospital discharge and lead to a high rate of SAT. The dosage and duration of infusion of eptifibatide in this setting needs further evaluation. 相似文献
7.
Randomised comparison of antero-lateral versus antero-posterior paddle positions for DC cardioversion of persistent atrial fibrillation 总被引:1,自引:0,他引:1
We designed a prospective, randomised, single-blind trial to compare the relative efficacy of antero-lateral versus antero-posterior paddle positions for DC cardioversion of persistent atrial fibrillation. A total of 59 patients were randomised to cardioversion using standard gel pads placed either in the antero-lateral (AL) or antero-posterior (AP) positions. The first synchronised shock was given at 360 J; if this was unsuccessful, a second shock of 360 J was given in the alternative position. We compared cardioversion success rate and energy requirements with each strategy. With the first 360 J DC shock, a significantly greater proportion of patients were restored to sinus rhythm from the antero-lateral position (18/30) compared to the antero-posterior position (10/29) (P=0.048). For those patients remaining in atrial fibrillation, there was no difference in the proportions cardioverted from the antero-lateral position (4/19) compared to the antero-posterior position (5/12) with the second 360 J DC shock (P=0. 22). The total cardioversion success rate was 23/30 (77%) for antero-lateral followed by antero-posterior shocks compared to a success rate of 14/29 (48%) for antero-posterior followed by antero-lateral shocks, and this difference was significant (P=0.024). There was no significant difference in the mean energy delivered for patients randomised to an initial antero-lateral shock (504 J), compared to patients given an initial antero-posterior shock (583 J) (P=0.1). We conclude that the antero-lateral paddle position appears more effective for DC cardioversion of persistent atrial fibrillation. 相似文献
8.
Arani AS Alaghehbandan R Akhlaghi L Shahi M Lari AR 《Revista do Instituto de Medicina Tropical de S?o Paulo》2008,50(3):145-149
The aim of this study was to describe epidemiologic characteristics of intestinal parasites in a population in south of Tehran, Iran. A retrospective cross-sectional study of patients with suspicious intestinal parasitic infections referred to the Zakaria Razi Laboratory in Shahre-Ray, southern Tehran, Iran, was conducted from April 21, 2004 to October 20, 2005. All stool samples were examined and socio-demographic informations were retrieved. Of 4,371 referred patients, 466 (239 males and 227 females) were laboratory diagnosed with intestinal parasites, with a period prevalence of 10.7%. Blastocystis hominis (B. hominis) and Giardia lamblia (G. lamblia) were the most frequent intestinal parasites. More than half of patients aged (3) 18 years had a low level of educational attainment (e.g. illiterate, primary school, high school) (170/331, 54.1%). Further, majority of patients were homemakers (42.3%, 140/331) or workers (28.1%, 93/331) employed in various business settings such as food industry and construction. Findings of this study showed that intestinal parasitic infections are still a major public health challenge in Iran that needs to be addressed. We believe that public education, improving sanitation conditions of underdeveloped areas/communities, community involvement, and supporting evidence-based practice/programs are the major keys to success in preventing the spread of intestinal parasitic infections in Iran. 相似文献
9.
BackgroundPediatric facial injuries are common due to children's high level of activity which gradually decreases as age advances. Main etiology in cases of pediatric age group are self-fall, sports related injuries, interpersonal violence and lastly road traffic accident. Pattern and management of facial fracture in pediatric age group is different to that of adult population.Material and methodsThis study included 87 patients who had facial injuries and who reported at dental institute RIMS, Ranchi over a period of three years from 2017 to 2020. Initial assessment diagnosis and management were given to the patients.ResultsSelf-fall accounted as the leading cause of fracture (47.1%). Most frequent age group with facial injuries were from 7 to 12 years age group (49.1%). Dentoalveolar pattern of facial fracture was most common accounting for (39.1%) followed by mandible fracture in 33.3%. Closed reduction of the fracture was the most common way of treatment. Open reduction and fixation was carried out in 3.4% patients.ConclusionSelf-fall was the main etiology in our study and younger age group patients were more involved. Conservative treatment are generally given to pediatric age group, with open reduction in few cases on the basis of displacement. Close monitoring and follow up is mandatory in these age group. 相似文献
10.
G Choudhuri V Prakash A Kumar S K Shahi M Sharma 《Scandinavian journal of infectious diseases》1991,23(6):771-776
To investigate the relationship between amoebic gut infection and the presence of serum antiamoebic antibodies in a community where amoebiasis is highly endemic, a cross-sectional population survey was conducted covering 982 subjects in 2 adjacent villages in rural India. E. histolytica was detected in fecal smears in 18.1% (88/487) and antiamoebic antibodies by micro-ELISA in 28.7% (251/874) subjects. In 450 subjects in whom there was no clinical evidence of invasive amoebic disease or history of ingestion of antiamoebic drugs in the previous year and from whom both stool and matched serum samples were obtained, correlation of gut infection with seropositivity was attempted. Seropositivity in 80 cyst passers (23.8%) was significantly lower than in 370 non-cyst passers (35.1%; p less than 0.05). Conversely the rate of gut infection with E. histolytica was lower in seropositive subjects (19/149; 12.8%) as compared to seronegative subjects (61/301; 23%, p less than 0.05). In the population where E. histolytica infection was highly endemic, the rate of gut infection with the parasite was inversely related to seropositivity. Our data suggests that invasive E. histolytica infection (mostly asymptomatic) evokes good gut immunity in the host with clearing of the parasite from the colon and/or resistance to reinfection. High prevalence rate of amoebic antibodies indicates good "herd" immunity. 相似文献