全文获取类型
收费全文 | 24417篇 |
免费 | 1508篇 |
国内免费 | 154篇 |
专业分类
耳鼻咽喉 | 298篇 |
儿科学 | 760篇 |
妇产科学 | 709篇 |
基础医学 | 2422篇 |
口腔科学 | 716篇 |
临床医学 | 2112篇 |
内科学 | 5340篇 |
皮肤病学 | 516篇 |
神经病学 | 1129篇 |
特种医学 | 801篇 |
外国民族医学 | 9篇 |
外科学 | 4330篇 |
综合类 | 702篇 |
现状与发展 | 1篇 |
一般理论 | 21篇 |
预防医学 | 1688篇 |
眼科学 | 719篇 |
药学 | 2133篇 |
4篇 | |
中国医学 | 156篇 |
肿瘤学 | 1513篇 |
出版年
2024年 | 150篇 |
2023年 | 384篇 |
2022年 | 1019篇 |
2021年 | 1459篇 |
2020年 | 767篇 |
2019年 | 935篇 |
2018年 | 1247篇 |
2017年 | 752篇 |
2016年 | 775篇 |
2015年 | 865篇 |
2014年 | 1075篇 |
2013年 | 1319篇 |
2012年 | 1816篇 |
2011年 | 1856篇 |
2010年 | 959篇 |
2009年 | 788篇 |
2008年 | 1162篇 |
2007年 | 1251篇 |
2006年 | 1092篇 |
2005年 | 947篇 |
2004年 | 892篇 |
2003年 | 753篇 |
2002年 | 695篇 |
2001年 | 328篇 |
2000年 | 315篇 |
1999年 | 291篇 |
1998年 | 157篇 |
1997年 | 114篇 |
1996年 | 101篇 |
1995年 | 106篇 |
1994年 | 69篇 |
1993年 | 54篇 |
1992年 | 130篇 |
1991年 | 120篇 |
1990年 | 114篇 |
1989年 | 103篇 |
1988年 | 97篇 |
1987年 | 94篇 |
1986年 | 97篇 |
1985年 | 85篇 |
1984年 | 68篇 |
1983年 | 87篇 |
1982年 | 35篇 |
1981年 | 44篇 |
1979年 | 78篇 |
1978年 | 44篇 |
1977年 | 52篇 |
1976年 | 41篇 |
1975年 | 44篇 |
1974年 | 38篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Sameh Shehata Sherif Shehata Herman L. Wella Mohamed Abouheba Ahmed Elrouby 《Hernia》2018,22(6):941-946
Purpose
To propose a new clinical classification for pediatric inguinal hernias modified from a similar classification system for adult inguinal hernia and to propose a tailored repair for each type. The impact of this approach on hernia recurrence will be assessed.Methods
This prospective and retrospective cross-sectional study was conducted in two tertiary teaching university hospitals in Egypt (Alexandria and Tanta University Children’s Hospitals) from January 2013 to December 2014 on children below 12 years of age with indirect inguinal hernias who were divided into two groups: (a) prospective group I, classified according to our proposed pediatric hernia classification and tailored treatment (PHCTT) into types: pediatric Nyhus 1 (PNI) assigned for herniotomy alone, pediatric Nyhus II (PNII) assigned for herniotomy plus deep ring narrowing, and type pediatric Nyhus III (PNIII) assigned for herniotomy plus posterior wall repair. (b) Retrospective unclassified group II where all cases were assigned to herniotomy alone (open). Data about patient characteristics, assigned hernia type, operative findings, procedures done, and postoperative complications were documented and analyzed by comparing the outcomes of the two groups.Results
A total of 371 patients were included in this study with 401 hernias (30 bilateral); group I included of 217 patients, while group II included 154 patients. There was a male preponderance in group I (173/217?=?80%) and in group II (130/154?=?85%); the majority in both groups were less than 12 months of age, in group I (132/217?=?66%) and in group II (120/154?=?85%). The median age was 4 months and the median duration of symptoms was 2 months. For group I, PNII hernias formed the predominant cluster making 40% (94/235) followed by PNI hernias making 34.8% (82/235), while PNIII hernias were the least group being 25% (59/235) only. The mean follow-up period was 9.2 months?±?4.8 SD (and 9.1 months?±?2 SD in group II). The pooled recurrence rate was 1.9% (8/401) of the whole series, a weighted mean of the individual recurrence rates of 0% (0/235) of group I and 4.8% (8/166) of group II patients, all males. This difference in the recurrence rates between the two groups was statistically significant (P?=?0.004).Conclusions
Pediatric inguinal hernias are not the same and there is extreme variation in the presentation regarding the size of the defect. We proposed a nouvelle pediatric hernia classification modified from the original Nyhus classification for adult inguinal hernia with tailored surgical approach to each type (PHCTT). Applying this (PHCTT), it has the benefit of a significant reduction of recurrence rate.72.
Relationship of serum haemojuvelin and hepcidin levels with iron level and erythropoietin requirement in prevalent hepatitis C virus positive haemodialysis patients 下载免费PDF全文
73.
Michael G. Fehlings Branko Kopjar Ahmed Ibrahim Lindsay A. Tetreault Paul M. Arnold Helton Defino Shashank Sharad Kale S. Tim Yoon Giuseppe M. Barbagallo Ronald H.M. Bartels Qiang Zhou Alexander R. Vaccaro Mehmet Zileli Gamaliel Tan Yasutsugu Yukawa Darrel S. Brodke Christopher I. Shaffrey Osmar Santos de Moraes Mark B. Dekutoski 《The spine journal》2018,18(4):593-605
Background Context
Degenerative cervical myelopathy (DCM) is a progressive degenerative spine disease and the most common cause of spinal cord impairment in adults worldwide. Few studies have reported on regional variations in demographics, clinical presentation, disease causation, and surgical effectiveness.Purpose
The objective of this study was to evaluate differences in demographics, causative pathology, management strategies, surgical outcomes, length of hospital stay, and complications across four geographic regions.Study Design/Setting
This is a multicenter international prospective cohort study.Patient Sample
This study includes a total of 757 symptomatic patients with DCM undergoing surgical decompression of the cervical spine.Outcome Measures
The outcome measures are the Neck Disability Index (NDI), the Short Form 36 version 2 (SF-36v2), the modified Japanese Orthopaedic Association (mJOA) scale, and the Nurick grade.Materials and Methods
The baseline characteristics, disease causation, surgical approaches, and outcomes at 12 and 24 months were compared among four regions: Europe, Asia Pacific, Latin America, and North America.Results
Patients from Europe and North America were, on average, older than those from Latin America and Asia Pacific (p=.0055). Patients from Latin America had a significantly longer duration of symptoms than those from the other three regions (p<.0001). The most frequent causes of myelopathy were spondylosis and disc herniation. Ossification of the posterior longitudinal ligament was most prevalent in Asia Pacific (35.33%) and in Europe (31.75%), and hypertrophy of the ligamentum flavum was most prevalent in Latin America (61.25%). Surgical approaches varied by region; the majority of cases in Europe (71.43%), Asia Pacific (60.67%), and North America (59.10%) were managed anteriorly, whereas the posterior approach was more common in Latin America (66.25%). At the 24-month follow-up, patients from North America and Asia Pacific exhibited greater improvements in mJOA and Nurick scores than those from Europe and Latin America. Patients from Asia Pacific and Latin America demonstrated the most improvement on the NDI and SF-36v2 PCS. The longest duration of hospital stay was in Asia Pacific (14.16 days), and the highest rate of complications (34.9%) was reported in Europe.Conclusions
Regional differences in demographics, causation, and surgical approaches are significant for patients with DCM. Despite these variations, surgical decompression for DCM appears effective in all regions. Observed differences in the extent of postoperative improvements among the regions should encourage the standardization of care across centers and the development of international guidelines for the management of DCM. 相似文献74.
Ahmed?Samir?BarakatEmail authorView authors OrcID profile Tamer?Owais Mohamed?Alhashash Mootaz?Shousha Hesham?El Saghir Bernward?Lauer Heinrich?Boehm 《European spine journal》2018,27(10):2584-2592
Background context
With more cement augmentation procedures done, the occurrence of serious complications is also expected to rise. Symptomatic central cement embolization is a rare but very serious complication. Moreover, the pathophysiology and treatment of intrathoracic cement embolism remain controversial.Purpose
In this case series, we are trying to identify various presentations and suggest our emergent management scheme for symptomatic central cement embolization.Patient sample
Retrospective case series of nine patients with symptomatic central cement embolism identified after vertebroplasty with 24 months of follow-up. Level IV.Outcome measures
The degree of dyspnea measured by the New York Heart Association (NYHA) score and/or death related to cement embolism induced cardio/respiratory failure at the final follow-up at 24 months.Methods
The nine patients, eight females, and one male had a mean age of 70.25 years (range 65–78 years) and were operated between January 2004 and December 2014. They had percutaneous vertebroplasty for osteoporotic non-traumatic and malignant vertebral collapse of dorsal and lumbar vertebrae. Post-vertebroplasty dyspnea and stitching chest pain were striking in the nine patients. After exclusion of cardiac ischemia and medical pulmonary causes for dyspnea, we identified radiopaque lesions on the chest X-ray. Further echocardiography and high-resolution chest CT were performed for optimal localization. Emergent heart surgery was performed in two patients: interventional therapy was conducted in one patient, while the remaining six patients were conservatively treated by anticoagulation. The management decision was taken in the setting of an interdisciplinary meeting depending on localization, fragmentation, and clinical status.Results
All patients of this series showed gradual improvement and an uneventful hospital stay. During our 24-month follow-up phase, eight patients showed no subsequent cardiological and/or respiratory symptoms (NYHA I). However, one mortality due to advanced malignancy occurred. Preoperative anemia was the only common intersecting preoperative parameter among these nine patients.Conclusions
After cement augmentation, close clinical monitoring is mandatory. A chest CT is pivotal in determining the interdisciplinary management approach in view of the availability of necessary expertise, facilities and the location of the cement emboli whether accessible by cardiac or vascular surgical means. The clinical presentation and its timing may vary and the patient may be seen subsequently by other health care providers obligating a wide-spread awareness for this serious entity among health care providers for this age group as spine surgeons, family and emergency room doctors, and institutional or home-care nurses. Most symptomatic central cement emboli may be treated conservatively.75.
76.
77.
AsmaGul Naz Muhammad Ali Muhammad Assad Aslam Abrar Ul Haq Khan Hamid Manzoor Rehana Iqbal Muhammad Ahmed Shehzad Shahbaz Ahmad Zubair Shaheen Sumaira Rasul 《Annals of human genetics》2019,83(6):426-433
Tuberculosis (TB) is a global issue as one‐third of the population worldwide is considered to be infected. TB has become a critical public health problem as a result of increasing drug resistance, which poses a challenge to current control strategies. Similar to environmental factors, genetic makeup of the host equally contributes to disease onset. We performed genotypic analysis to examine the relationship between IFNG and TB onset and drug resistance in a Pakistani population comprising 689 subjects. Notable differences were observed in the IFNG polymorphism (+874T/A) between the case and control groups. The frequency of the wild‐type genotype (TT) in the controls (43.2%) was significantly higher than in the cases (25.3%) (odds ratio [OR] = 0.77, p < 0.0001), while the mutant genotype frequency (AA) (38.57%) in the cases was significantly higher than in the controls (22.6%) (OR = 1.46, p < 0.0001). The heterozygous genotype frequency (TA) did not significantly differ between the control and case groups. Compared with the controls, the variant allele (A) was approximately twice as frequent in the cases. Females and older people have a higher chance of disease development. Finally, the IFNG (+874T/A) polymorphism was not associated with drug sensitivity or resistance. However, a genotypic polymorphism of IFNG (+874T/A) was significantly associated with susceptibility to TB, and the T allele conferred protection against TB. Additional studies involving larger cohorts are needed to further explore this relationship between genetics and disease vulnerability. 相似文献
78.
79.
Ahmed MS Ibrahim Hani H Sinno Ali Izadpanah Joshua Vorstenbosch Tassos Dionisopoulos Mark K Markarian Bernard T Lee Samuel J Lin 《CANADIAN JOURNAL OF PLASTIC SURGERY》2015,23(2):103-107
BACKGROUND:
Breast ptosis can occur with aging, and after weight loss and breastfeeding. Mastopexy is a procedure used to modify the size, contour and elevation of sagging breasts without changing breast volume. To gain more knowledge on the health burden of living with breast ptosis requiring mastectomy, validated measures can be used to compare it with other health states.OBJECTIVE:
To quantify the health state utility assessment of individuals living with breast ptosis who could benefit from a mastopexy procedure; and to determine whether utility scores vary according to participant demographics.METHODS:
Utility assessments using a visual analogue scale (VAS), time trade-off (TTO) and standard gamble (SG) methods were used to obtain utility scores for breast ptosis, monocular blindness and binocular blindness from a sample of the general population and medical students. Linear regression and the Student’s t test were used for statistical analysis; P<0.05 was considered to be statistically significant.RESULTS:
Mean (± SD) measures for breast ptosis in the 107 volunteers (VAS: 0.80±0.14; TTO: 0.87±0.18; SG: 0.90±0.14) were significantly different (P<0.0001) from the corresponding measures for monocular blindness and binocular blindness. When compared with a sample of the general population, having a medical education demonstrated a statistically significant difference in being less likely to trade years of life and less likely to gamble risk of a procedure such as a mastopexy. Race and sex were not statistically significant independent predictors of risk acceptance.DISCUSSION:
For the first time, the burden of living with breast ptosis requiring surgical intervention was determined using validated metrics (ie, VAS, TTO and SG). The health burden of living with breast ptosis was found to be comparable with that of breast hypertrophy, unilateral mastectomy, bilateral mastectomy, and cleft lip and palate. Furthermore, breast ptosis was considered to be closer to ‘perfect health’ than monocular blindness, binocular blindness, facial disfigurement requiring face transplantation surgery, unilateral facial paralysis and severe lower extremity lymphedema.CONCLUSIONS:
Quantifying the health burden of living with breast ptosis requiring mastopexy indicated that is comparable with other breast-related conditions (breast hypertrophy and bilateral mastectomy). Numerical values have been assigned to this health state (VAS: 0.80±0.14; TTO: 0.87±0.18; and SG: 0.90±0.14), which can be used to form comparisons with the health burden of living with other disease states. 相似文献80.