全文获取类型
| 收费全文 | 532479篇 |
| 免费 | 28934篇 |
| 国内免费 | 485篇 |
专业分类
| 耳鼻咽喉 | 6702篇 |
| 儿科学 | 17131篇 |
| 妇产科学 | 12678篇 |
| 基础医学 | 92985篇 |
| 口腔科学 | 12369篇 |
| 临床医学 | 48887篇 |
| 内科学 | 95462篇 |
| 皮肤病学 | 12279篇 |
| 神经病学 | 34289篇 |
| 特种医学 | 20009篇 |
| 外国民族医学 | 53篇 |
| 外科学 | 78589篇 |
| 综合类 | 7771篇 |
| 现状与发展 | 2篇 |
| 一般理论 | 126篇 |
| 预防医学 | 38974篇 |
| 眼科学 | 11941篇 |
| 药学 | 41766篇 |
| 1篇 | |
| 中国医学 | 1096篇 |
| 肿瘤学 | 28788篇 |
出版年
| 2019年 | 3970篇 |
| 2018年 | 5820篇 |
| 2017年 | 4190篇 |
| 2016年 | 4923篇 |
| 2015年 | 5422篇 |
| 2014年 | 7203篇 |
| 2013年 | 10669篇 |
| 2012年 | 15830篇 |
| 2011年 | 17647篇 |
| 2010年 | 10058篇 |
| 2009年 | 8957篇 |
| 2008年 | 15944篇 |
| 2007年 | 17720篇 |
| 2006年 | 17186篇 |
| 2005年 | 16492篇 |
| 2004年 | 16097篇 |
| 2003年 | 15479篇 |
| 2002年 | 14994篇 |
| 2001年 | 22608篇 |
| 2000年 | 23134篇 |
| 1999年 | 19024篇 |
| 1998年 | 5063篇 |
| 1997年 | 4151篇 |
| 1996年 | 4182篇 |
| 1995年 | 4194篇 |
| 1992年 | 14551篇 |
| 1991年 | 15977篇 |
| 1990年 | 16101篇 |
| 1989年 | 15781篇 |
| 1988年 | 14437篇 |
| 1987年 | 14333篇 |
| 1986年 | 13284篇 |
| 1985年 | 12810篇 |
| 1984年 | 9483篇 |
| 1983年 | 8089篇 |
| 1982年 | 4226篇 |
| 1979年 | 9045篇 |
| 1978年 | 6445篇 |
| 1977年 | 5192篇 |
| 1976年 | 5558篇 |
| 1975年 | 6668篇 |
| 1974年 | 7476篇 |
| 1973年 | 7223篇 |
| 1972年 | 6645篇 |
| 1971年 | 6355篇 |
| 1970年 | 5931篇 |
| 1969年 | 5519篇 |
| 1968年 | 5188篇 |
| 1967年 | 4657篇 |
| 1966年 | 3987篇 |
排序方式： 共有10000条查询结果，搜索用时 16 毫秒
81.
82.
83.
A. Fanlo Zarazaga J. Gutiérrez Vásquez V. Pueyo Royo 《Archivos de la Sociedad Espa?ola de Oftalmología》2019,94(1):25-32
Introduction
Congenital colour vision deficiencies affect 8% of the male and 0.5% of the female population. The study of colour vision is a complex process due to several factors: the psychophysics of vision itself, the difficulty to establish mathematical models for its analysis, the vague correlation of results between different tests, and the influence of external factors such as lighting, the tests condition, or the experience of the examiner and the patient. In the present document, a simplified review was carried out on the main colour vision tests available in clinical practice.Material and methods
Once a filtered preliminary review was made of the bibliography related to the study of colour vision using the PubMed search tool, the most used tests in clinical practice were selected according to their frequency of use and the purpose for which they were applied. A bibliographic study was then carried out on each particular test according to the design of the shown stimuli, its target population, and its sensitivity and specificity.Results
From the 95 publications found using the PubMed search tool, in 41 of them, colour tests were used by researchers in their methodology. From the 64 colour tests used, 19 of them were different (with 4 of them being different tests adapted by research groups, and 2 of them carried out online).The most used tests were the following: Ishihara test (10.88%), Farnsworth-Munsell (7.04%), Farnsworth-Munsell 100 Hue (6.4%), Cambridge Colour Test (3.84%), Hardy-Rand-Rittler (3.2%), tests developed by the groups (2.56%), the Anomaloscope (1.28%), the online tests (1.28%) and, finally, Colour Assessment and Diagnosis (0.64%), Pflüger Trident Colour Plates (0.64%), Toothguide Training Box (0.64%), Lanthony Desaturated D-15 (0.64%), City University Test (0.64%), Universal Colour Discrimination Test (0.64%), and Rabin Cone Contrast Test (0.64%).Conclusions
The Anomaloscope is the “gold standard” in terms of colour vision testing, despite its incompatibility with daily clinical practice. It is fairly complex to use, difficult to understand for children, and its practice requires having the time available. Nevertheless, it is possible to reach an accurate approximation through the combination of some of the tests listed in this article. The above mentioned tests are a good alternative to determine the presence of dyschromatopsia in settings closer to daily clinical practice or in less controlled settings than a clinical study. The major drawback among the wide range of tests available for the study of colour vision is the difficulty to compare results between tests, since units of the reported data are usually different, and experience is required for its correct interpretation. Currently, there is no consensus on which colour test is the most complete. It is, therefore, advisable to use at least 2 tests in order to ensure diagnoses, and have more extensive information about the visual perception of patients. 相似文献84.
85.
86.
87.
88.
Catarina Oliveira Catarina Marques Vânia Simões Leina Spencer Rita Poeira Margarida Casteleira 《Brazilian Journal of Anesthesiology》2019,69(2):218-221
Background and objectives
Sugamadex is a modified gamma‐cyclodextrin, the first selective agent for reversal of neuromuscular blockade induced by steroidal non‐depolarizing muscle relaxants, with greater affinity for rocuronium. In this article we present a case of severe bradycardia and asystole following sugammadex administration.Case report
A 54‐year‐old male patient, ASA II, with a history of hypertension, dyslipidemia and obesity, who underwent an emergency umbilical herniorrhaphy under balanced general anesthesia. Intraoperative muscle relaxation was maintained with rocuronium. At the end of the surgery, the patient maintained a neuromuscular block with two TOF responses, and sugammadex (200 mg) was administered. About thirty seconds after its administration, the patient developed marked bradycardia (HR 30 bpm) followed by asystole.Conclusions
Documented bradycardia and asystole were attributed to the administration of sugammadex. This case shows that, although rare, cardiac arrest is a possible adverse effect of this drug, and that the knowledge of this situation can be determinant for the patient's evolution. 相似文献89.
F. Paganelli L. Mantecchini D. Peritore V. Morabito L. Rizzato A. Nanni Costa 《Transplantation proceedings》2019,51(1):100-105
Background
The efficiency of transport phases is a key factor in successful organ transplant operations. Reliability, safety, and punctuality must be in compliance with the European Union and national frameworks and be consistent with economic, quantitative, and level-of-service parameters. In this study we investigated the optimal numbers and locations of aircraft in the Italian territory by comparing performance indexes related to different time intervals and service design scenarios.Methods
An integer linear programming model is described as an optimal service solution for covering the demand for extraregional organ transport by air between June 2015 and May 2016. Restrictions on aircraft utilization and actual length of the missions in cases of incompatible activities are the relevant input data of the model.Results
Based on mission durations and their origin and destination, the model returns the optimal number and location of aircraft in various scenarios. The performance parameters required by law and the need to guarantee the service from/to the whole territory, together with the transplant figures performed and transplant center locations, have been taken into account to determine the most efficient spatial and numerical allocation.Conclusion
The efficient design of an urgency-based service such as the transportation of organs for transplant purposes is not an easy task. Nevertheless, knowledge of the logistic chain and continuous monitoring and update of data and performance parameters can allow for collection of useful information to guarantee a high-performing service. 相似文献90.