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   13463篇
  免费   852篇
  国内免费   511篇
耳鼻咽喉   27篇
儿科学   128篇
妇产科学   30篇
基础医学   624篇
口腔科学   200篇
临床医学   1862篇
内科学   2422篇
皮肤病学   562篇
神经病学   188篇
特种医学   523篇
外科学   1874篇
综合类   2538篇
预防医学   501篇
眼科学   356篇
药学   1656篇
  20篇
中国医学   1215篇
肿瘤学   100篇
  2024年   43篇
  2023年   273篇
  2022年   390篇
  2021年   447篇
  2020年   415篇
  2019年   350篇
  2018年   328篇
  2017年   403篇
  2016年   407篇
  2015年   411篇
  2014年   850篇
  2013年   1060篇
  2012年   832篇
  2011年   861篇
  2010年   694篇
  2009年   620篇
  2008年   601篇
  2007年   602篇
  2006年   578篇
  2005年   544篇
  2004年   434篇
  2003年   385篇
  2002年   331篇
  2001年   391篇
  2000年   308篇
  1999年   256篇
  1998年   251篇
  1997年   211篇
  1996年   207篇
  1995年   181篇
  1994年   171篇
  1993年   119篇
  1992年   117篇
  1991年   106篇
  1990年   98篇
  1989年   88篇
  1988年   96篇
  1987年   81篇
  1986年   50篇
  1985年   40篇
  1984年   33篇
  1983年   29篇
  1982年   21篇
  1981年   20篇
  1980年   20篇
  1979年   16篇
  1978年   14篇
  1977年   14篇
  1976年   12篇
  1975年   9篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
A meta-analysis investigation to measure the relationship between vitamin D deficiency (VDD) and diabetic foot ulcer (DFU). A comprehensive literature inspection till February 2023 was applied and 1765 interrelated investigations were reviewed. The 15 chosen investigations enclosed 2648 individuals with diabetes mellitus in the chosen investigations' starting point, 1413 of them were with DFUs, and 1235 were without DFUs. Odds ratio (OR) in addition to 95% confidence intervals (CIs) were used to compute the value of the relationship between VDD and DFU by the dichotomous and continuous approaches and a fixed or random model. Individuals with DFUs had significantly lower vitamin D levels (VDL) (MD, −7.14; 95% CI, −8.83 to −5.44, P < 0.001) compared to those without DFU individuals. Individuals with DFUs had a significantly higher number of VDD individuals (OR, 2.27; 95% CI, 1.63-3.16, P < 0.001) compared to those without DFU individuals. Individuals with DFU had significantly lower VDL and a significantly higher number of VDD individuals compared to those without DFU individuals. However, caused of the small sample sizes of several chosen investigations for this meta-analysis, care must be exercised when dealing with its values.  相似文献   
102.
A specific assessment tool is urgently needed to guide effective wound care for diabetic foot ulcers. However, the tool has not been available in Chinese. We aimed to culturally translate and verify the validity and reliability of the new Diabetic Foot Ulcer Assessment Scale (DFUAS). The original scale was translated into Chinese according to the Brislin guidelines. Patients satisfying the inclusion and exclusion criteria were recruited. Each of the included foot ulcers was evaluated independently by two wound care specialists using the new DFUAS and by the third wound care specialists at the same time using the Bates-Jensen Wound Assessment Tool according to per guidelines. 210 diabetic foot ulcers were included for data analysis. The S-CVI of the Chinese version of the DFUAS was 0.96, and the I-CVIs ranged from 0.89 to 0.98. The total Cronbach's Alpha of the scale was 0.709, and the corrected item-total correlation of the items ranged from 0.4 to 0.872. The DFUAS had high inter-observer reliability of 0.997, and there were weak, moderate, and strong correlations between each pair of the items. The Bland–Altman plots showed a good agreement between the scale and the Bates-Jensen Wound Assessment Tool. We concluded that the Chinese version of the DFUAS showed good validity and reliability and is a reliable instrument for the assessment of diabetic foot ulcers.  相似文献   
103.
Post-induction hypotension is common and associated with postoperative complications. We hypothesised that pneumatic leg compression reduces post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy. In this double-blind randomised study, patients were allocated randomly to the pneumatic leg compression group (n = 50) or control (n = 50). In the intervention group, pneumatic leg compression was initiated before induction of anaesthesia. In the control group, pneumatic leg compression was initiated 20 min after anaesthesia induction. The primary outcome was the incidence of post-induction hypotension in these groups. Post-induction hypotension was defined as systolic blood pressure < 90 mmHg during the first 20 min after induction. Haemodynamic variables and area under the curve of post-induction systolic blood pressure over time were assessed. Complications associated with pneumatic leg compression were recorded, including: peripheral neuropathy; compartment syndrome; extensive bullae beneath the leg sleeves; and pulmonary thromboembolism. The incidence of post-induction hypotension decreased in the pneumatic leg compression group compared with that in the control group; 5 (10%) vs. 29 (58%), respectively, p < 0.001. In the pneumatic leg compression group, the lowest systolic, diastolic and mean blood pressures 20 min after induction of anaesthesia were significantly greater than the control group. Pneumatic leg compression resulted in an increased area under the curve of systolic blood pressure in the first 20 min after induction, p = 0.001. There were no pneumatic leg compression-related complications. Pneumatic leg compression reduced post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy, suggesting that it is an effective and safe intervention to prevent post-induction hypotension among elderly patients undergoing general anaesthesia.  相似文献   
104.
This study aimed to explore the risk factors for foot ulcer recurrence in patients with comorbid diabetic foot osteomyelitis (DFO) and diabetic nephropathy (DN). This is a prospective cohort study. Between May 2018 and May 2021, we selected 120 inpatients with comorbid severe diabetic foot infection (PEDIS Grade 3 or above) and DN for inclusion in our study. All cases were followed up for 36 months. The study outcomes were whether foot ulcer recurred and the time to recurrence. The risk factors of ulcer recurrence were analysed by comparing the data of the three groups. According to the recurrence of foot ulcer, the participants were divided into three groups: Group A (no foot ulcer recurrence, n = 89), Group B (foot ulcer recurrence within 12-36 months, n = 19) and Group C (foot ulcer recurrence within 6-12 months, n = 12). The multivariate Cox regression analysis showed that urine albumin-creatinine ratio (UACR) (HR: 1.008, 95% CI: 1.005-1.011, P < .001) and vibration perception threshold (VPT) (HR: 1.064, 95% CI: 1.032-1.096, P < .001) were identified as independent risk factors. Kaplan-Meier curves showed a significant positive association between UACR or VPT and the risk of foot ulcer recurrence (log rank, all P < .05). Areas under the ROC curves for UACR, VPT and the combination of UACR and VPT were 0.802, 0.799 and 0.842, respectively. The best cut-off values of UACR and VPT were 281.51 mg/g and 25.12 V, respectively. In summary, elevated UACR and VPT were independent risk factors. The best clinical cut-off values of UACR and VPT for prediction of foot ulcer recurrence were 281.51 mg/g and 25.12 V, respectively. Besides, our results suggested that microcirculation disorders rather than macrovascular complications play a major role in the recurrence of foot ulcer in patients with comorbid DFO and DN.  相似文献   
105.
十二指肠乳头肿瘤的外科治疗(附68例报告)   总被引:2,自引:0,他引:2  
1990年1月至1998年3月收治十二指肠乳头肿瘤68例。B超和CT检查诊断阳性率(基本准确)分别为655%、809%。ERCP检查43例,全部确诊。58例施行手术治疗,病理检查43例均为腺癌,周围组织浸润和远处转移与肿瘤的大小无明显关系。主要手术方式:胰十二指肠切除42例(其中保留幽门9例),切除率724%,乳头肿瘤切除及乳头括约肌成形术1例,姑息性手术15例。术后主要并发症有应激性溃疡7例(121%),胃潴留4例(69%)。十二指肠乳头肿瘤多为腺癌,内镜检查是主要诊断手段,治疗上应积极争取行胰十二指肠切除  相似文献   
106.
目的观察半导体激光照射联合康复新液治疗皮肤溃疡的临床疗效。方法各种原因所致皮肤溃疡患者136例,分为对照组患者68例,采用康复新液外敷,每日2次;试验组患者68例,采用半导体激光联合康复新液外敷治疗,激光照射时间10min,每日1次,治疗后3、7、14、21d进行疗效评价。比较两组患者治疗后21d的有效率。结果试验组和对照组有效率分别为88.2%和76.5%,差异有非常显著意义(P〈0.01),两组总积分值降低的差异有非常显著意义(P〈0.01).结论半导体激光联合康复新液治疗皮肤溃疡疗效较单纯外用康复新液治疗疗效好。  相似文献   
107.
Chronic leg ulcers are a public health problem that can have a significant impact on the patient's physical, socioeconomic and psychological status. The aim of this study is to evaluate the quality of life, anxiety and depression, self‐esteem and loneliness in patients suffering from leg ulcers. A total of 102 patients were enrolled in the study. The quality of life, anxiety and depression, self‐esteem and loneliness of the patient were assessed using the Dermatology Life Quality Index (DLQI), Hospital Anxiety and Depression Scale (HADS), Rosenberg's Self‐esteem Scale (RSES) and the UCLA Loneliness Scale (UCLA‐Version 3), respectively. The mean DLQI score was 13·38 ± 2·59, suggesting a serious effect on the quality of life of patients. Those with leg ulcers had statistically significant higher scores according to the HADS‐total scale (P = 0·031) and HADS‐anxiety subscale (P = 0·015) compared with healthy volunteers. Moreover, a statistically significant difference was found between the two groups concerning the UCLA‐scale (P = 0·029). Female patients presented with a higher score of anxiety (P = 0·027) and social isolation (P = 0·048), and worse quality of life (P = 0·018) than male patients. A severe quality of life impairment was documented, reflecting a significant psychosocial impact on patients with leg ulcers.  相似文献   
108.
The objective of this study was to investigate the safety and performance of AQUACEL? Ag+ dressing, a wound dressing containing a combination of anti‐biofilm and antimicrobial agents, in the management of chronic wounds. Patients (n = 42) with venous leg ulcers exhibiting signs of clinical infection were treated for 4 weeks with AQUACEL? Ag+ dressing, followed by management with AQUACEL? wound dressings for 4 weeks. Wound progression, wound size, ulcer pain and clinical evolution of the wound were assessed for up to 8 weeks. Adverse events were recorded throughout the study. AQUACEL? Ag+ dressing had an acceptable safety profile, with only one patient discontinuing from the study, because of a non‐treatment‐related adverse event. After 8 weeks, substantial wound improvements were observed: 5 patients (11·9%) had healed ulcers and 32 patients (76·2%) showed improvement in ulcer condition. The mean ulcer size had reduced by 54·5%. Patients reported less pain as the study progressed. Notable improvements were observed in patients with ulcers that were considered to require treatment with systemic antibiotics or topical antimicrobials at baseline (n = 10), with a mean 70·2% reduction in wound area. These data indicate that AQUACEL? Ag+ dressing has an acceptable safety profile in the management of venous leg ulcers that may be impeded by biofilm.  相似文献   
109.
Resource use and costs for topical treatment of hard‐to‐heal ulcers based on data from the Swedish Registry of Ulcer Treatment (RUT) were analysed in patients recorded in RUT as having healed between 2009 and 2012, in order to estimate potential cost savings from reductions in frequency of dressing changes and healing times. RUT is used to capture areas of improvement in ulcer care and to enable structured wound management by registering patients with hard‐to‐heal leg, foot and pressure ulcers. Patients included in the registry are treated in primary care, community care, private care, and inpatient hospital care. Cost calculations were based on resource use data on healing time and frequency of dressing changes in Swedish patients with hard‐to‐heal ulcers who healed between 2009 and 2012. Per‐patient treatment costs decreased from SEK38 223 in 2009 to SEK20 496 in 2012, mainly because of shorter healing times. Frequency of dressing changes was essentially the same during these years, varying from 1·4 to 1·6 per week. The total healing time was reduced by 38%. Treatment costs for the management of hard‐to‐heal ulcers can be reduced with well‐developed treatment strategies resulting in shortened healing times as shown in RUT.  相似文献   
110.
The systemic host defence mechanisms, especially innate immunity, in venous leg ulcer patients are poorly investigated. The aim of the current study was to measure Candida albicans killing activity and gene expressions of pro‐ and anti‐inflammatory cytokines and innate immune response regulators, TAM receptors and ligands of peripheral blood mononuclear cells separated from 69 venous leg ulcer patients and 42 control probands. Leg ulcer patients were stratified into responder and non‐responder groups on the basis of wound healing properties. No statistical differences were found in Candida killing among controls, responders and non‐responders. Circulating blood mononuclear cells of patients overexpress pro‐inflammatory (IL‐1α, TNFα, CXCL‐8) and anti‐inflammatory (IL‐10) cytokines as well as TAM receptors (Tyro, Axl, MerTK) and their ligands Gas6 and Protein S compared with those of control individuals. IL‐1α is notably overexpressed in venous leg ulcer treatment non‐responders; in contrast, Axl gene expression is robustly stronger among responders. These markers may be considered as candidates for the prediction of treatment response among venous leg ulcer patients.  相似文献   
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