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   126272篇
  免费   9657篇
  国内免费   3636篇
耳鼻咽喉   989篇
儿科学   2332篇
妇产科学   1799篇
基础医学   7090篇
口腔科学   2904篇
临床医学   15145篇
内科学   18879篇
皮肤病学   2318篇
神经病学   6454篇
特种医学   4090篇
外国民族医学   43篇
外科学   12467篇
综合类   18323篇
现状与发展   23篇
一般理论   2篇
预防医学   5306篇
眼科学   2076篇
药学   10270篇
  80篇
中国医学   11234篇
肿瘤学   17741篇
  2024年   323篇
  2023年   2270篇
  2022年   4152篇
  2021年   5605篇
  2020年   5306篇
  2019年   4798篇
  2018年   4449篇
  2017年   4906篇
  2016年   5221篇
  2015年   5019篇
  2014年   9020篇
  2013年   11397篇
  2012年   7358篇
  2011年   7855篇
  2010年   6481篇
  2009年   5933篇
  2008年   5822篇
  2007年   6240篇
  2006年   5578篇
  2005年   4953篇
  2004年   4026篇
  2003年   3649篇
  2002年   2990篇
  2001年   2633篇
  2000年   2185篇
  1999年   1715篇
  1998年   1422篇
  1997年   1195篇
  1996年   987篇
  1995年   896篇
  1994年   707篇
  1993年   542篇
  1992年   490篇
  1991年   443篇
  1990年   381篇
  1989年   329篇
  1988年   321篇
  1987年   274篇
  1986年   217篇
  1985年   259篇
  1984年   225篇
  1983年   165篇
  1982年   164篇
  1981年   167篇
  1980年   130篇
  1979年   121篇
  1978年   66篇
  1977年   42篇
  1976年   49篇
  1975年   32篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
60例(男50,女10,年龄43±8a)经内窥镜证实的活动性消化性溃疡患者,口服法莫替丁40mg,qn,疗程2-4wk或延至6-9wk。溃疡愈合率DU2,4,6 wk分别为50%,84%,92%,SU2,4,6,8 wk分别为40%,68%,73%,82%。服药后3,7,14 d上腹痛缓解率DU为50%,80%,100%,SU为40%,75%,95%。未见严重不良反应。故法莫替丁对溃疡病,尤其是DU是一有效和安全药物。  相似文献   
92.
The irritable bowel syndrome (IBS) is a very common disorder of intestinal function characterized by variable symptoms of abdominal pain, diarrhea, constipation and bloating. The spectrum of severity ranges from mild symptoms, not worthy of clinical attention, to intense and continuous symptoms associated with impaired health-related quality of life and high health care use. Psychosocial disturbance is commonly found among patients with irritable bowel, but until recently, its precise role in the disorder was uncertain. The data now suggest that irritable bowel is not a psychiatric disorder per se, but psychosocial factors including life stress, psychiatric comorbidity and abnormal illness behavior, among others, influence how the illness is experienced and acted upon. Patients with mild symptoms usually respond to education, reassurance, dietary modification and, when needed, antimotility agents. However, patients with more severe symptoms, who usually have greater psychosocial disturbance, will also require behavioral interventions, and possibly psychopharmacological agents. In sum, a graduated, multicomponent plan of care that includes dietary, behavioral and pharmacological treatments is recommended.  相似文献   
93.
Psoriasis is a chronic, incurable disease that frequently requires long-term treatment. Although many patients benefit from effective traditional systemic therapies, namely methotrexate, cyclosporin, retinoids and fumaric acid esters, and some patients achieve long-term disease control, unrestricted long-term administration is not recommended due to the potential for cumulative toxicity. In order to diminish the risk of toxicity, physicians have adopted various treatment approaches (e.g. rotational, sequential, intermittent, and combination). However, these approaches may not provide continuous disease control or a stable treatment regimen. The recent advent of targeted biological therapeutics such as etanercept, infliximab, adalimumab, alefacept and efalizumab may offer physicians and their patients treatment options with improved safety profiles that may permit continuous disease control.  相似文献   
94.
[目的]探讨顺铂引起恶心呕吐的有效治疗途径。[方法]对肺癌患者64例,随机分2组。自拟人参二苓解毒汤联合盐酸恩丹西酮注射液(以下简称商品名欧贝)(B组)和单独使用欧贝(A组)对顺铂为主的静脉化疗后镇吐疗效。[结果]B组(78·13%,93·75%)较A组(59·38%,75·00%)在近期镇吐治疗(指化疗后24-48h出现恶心呕吐)有明显差异(P<0·05),并在副作用方面,如便秘,乏力症状和血三系下降有明显差异(P<0·05)。[结论]辅以自拟人参二苓解毒汤确有增效解毒功能。  相似文献   
95.
Concepts in “fast-track” surgery, which provide optimal perioperative care, have been proven to significantly reduce complication rates and decrease hospital stay. This study explores whether fast-track concepts can also be safely applied and improve the outcomes of major pancreatic resections. Perioperative data from 255 consecutive patients, who underwent pancreatic resection by means of fast-track surgery in a high-volume medical center, were analyzed using univariate and multivariate models. Of the 255 patients, 180 received a pancreatic head resection and 51 received distal, 15 received total, and 9 received segmental pancreatectomies. The patients were discharged on median day 10 with a 30-day readmission rate of 3.5%. The in-hospital mortality was 2%, whereas medical and surgical morbidities were 17 and 25%, respectively. Fast-track parameters, such as first stools, normal food, complete mobilization, and return to normal ward, correlated significantly with early discharge (p < 0.05). Patients’ age, operation time, and early extubation proved to be independent factors of early discharge, shown through multivariate analysis (odds ratio: 4.0, 2.0, and 2.8, respectively; p < 0.05). Low readmission, mortality, and morbidity rates demonstrate that fast-track surgery is in fact feasible and safe and promotes earlier discharge without compromising patient outcomes.  相似文献   
96.
Background Cosmetic changes are to be expected after radiotherapy for skin tumours. Objectives This study aimed to answer the questions: How frequent are cosmetic changes after soft X‐ray therapy? Do treatment parameters, tumour thickness, localization and size of the irradiated field have a major influence? Were patients irritated by the visual appearance of the irradiated field? Methods In total, 2474 examinations of 1149 irradiated fields were performed. Results Hypopigmentation was found in 64.7% of examinations more than 90 days after therapy, teleangiectases in 43.1%, erythema in 24.8%, and hyperpigmentation in 16.8%. The frequency of hypopigmentation, teleangiectases and hyperpigmentation increased with time from X‐ray exposure; more than 4 years after therapy hypopigmentation was diagnosed in 91.8% and teleangiectases in 82.2% of examinations. Total dose, the time–dose–fractionation factor (TDF), field size and dose per fraction were significantly related to the frequency of cosmetic changes. Incidence rates of cosmetic changes differed by less than 15% if different treatment conditions were compared: thicker vs. thinner tumours, larger vs. smaller fields, higher vs. lower total doses, doses per fraction, and TDF. Frequencies of hypopigmentation, teleangiectases, erythema and hyperpigmentation differed by more than 15% between some localizations on the head. Women reported irritation by the visual appearance of the irradiated field in 12.6% of 1116 interviews, and men in 4.4% of 1284 interviews. Conclusions Cosmetic changes after soft X‐ray therapy are relatively frequent. Treatment parameters, tumour thickness and field size have only a minor influence. Few patients, but more women than men, were irritated by the visual appearance of the irradiated field.  相似文献   
97.
麦燕芳 《山西中医》2007,23(5):18-19
目的:观察自拟胃胆宁汤治疗胆汁反流性胃炎的临床疗效。方法:选符合标准的该病患者82例,随机分为两组,治疗组54例予自拟胃胆宁汤,对照组28例用吗丁啉片及雷尼替丁,两组治疗4周为1疗程。结果:治疗组痊愈20例,显效13例,有效16例,无效5例,总有效率为90.74%(95%CI=83.01%~98.48%);对照组痊愈5例,显效6例,有效9例,无效8例,总有效率为71.43%(95%CI=54.70%~88.16%);两组综合疗效比较,有显著性差异(u=2.3027,P=0.0215)。结论:自拟胃胆宁汤治疗胆汁反流性胃炎疗效优于吗丁啉及雷尼替丁,其收益为OR=0.25(95%CI=0.07~0.87),NNT=5(95%CI=2.78~37.88)。  相似文献   
98.
Rotigotine is a new, non-ergot dopamine agonist formulated in a transdermal delivery system. The present study was to investigate the efficacy and safety of the rotigotine transdermal patch in the treatment of early Parkinson's disease. Patients (n = 561) were randomized to rotigotine, ropinirole, or placebo. The titration period was up to 13 weeks, and there was a minimum dose-maintenance period of 24 weeks for ropinirole and 33 weeks for rotigotine. The primary endpoint was the proportion of patients with a minimum of 20% decrease in the combined Unified Parkinson's Disease Rating Scale Part II and Part III scores. The responder rate in the rotigotine group was significantly higher than in the placebo group (52% vs. 30%, P < 0.0001). Transdermal rotigotine at doses < or =8 mg/24 h did not show noninferiority to ropinirole at doses < or =24 mg/day. In a post-hoc subgroup analysis, rotigotine < or =8 mg/24 hours had a similar efficacy to ropinirole at doses < or =12 mg/day. The rotigotine transdermal patch was well tolerated. The most common adverse events were application-site reactions, nausea, and somnolence. Application-site reactions were predominantly mild or moderate in intensity. In conclusion, the rotigotine transdermal patch represents an effective and safe option for the treatment of patients with early Parkinson's disease.  相似文献   
99.
The purpose of this study was to evaluate the dose to normal tissues as a function of increasing margins around the lumpectomy cavity in accelerated partial breast irradiation (APBI) using 3D-conformal radiotherapy (3DCRT). Eight patients with Stage 0-I breast cancer underwent treatment planning for 3DCRT APBI. The clinical target volume (CTV) was defined as a 15-mm expansion around the cavity limited by the chest wall and skin. Three planning target volumes (PTV1, PTV2, PTV3) were generated for each patient using a 0, 5-, and 10-mm expansion around the CTV, for a total margin of 15, 20, and 25 mm. Three treatment plans were generated for every patient using the 3 PTVs, and dose-volume analysis was performed for each plan. For each 5-mm increase in margin, the mean PTV:total breast volume ratio increased 10% and the relative increase in the mean ipsilateral breast dose was 15%. The mean volume of ipsilateral breast tissue receiving 75%, 50%, and 25% of the prescribed dose increased 6% to 7% for every 5 mm increase in PTV margin. Compared to lesions located in the upper outer quadrant, plans for medially located tumors revealed higher mean ipsilateral breast doses and 20% to 22% more ipsilateral breast tissue encompassed by the 25% IDL. The use of 3DCRT for APBI delivers higher doses to normal breast tissue as the PTV increases around the lumpectomy cavity. Efforts should be made to minimize the overall PTV when this technique is used. Ongoing studies will be necessary to determine the clinical relevance of these findings.  相似文献   
100.
AIM: The aim of this pilot study was an investigation on photodynamic therapy (PDT) whether it is a good alternative for treating periungual and subungual warts of the hands. STUDY DESIGN: Twenty patients (mean age: 30.5 years) with a total of 40 periungual and subungual warts were treated with PDT. A photosensitizer, 20%delta-aminolevulinic acid was applied on the warts. After a mean incubation time of 4.6 h (SD: 1.2), the warts were irradiated with the VersaLight for 5-30 min (15.2 +/- 4.3 min). RESULTS: After a mean of 4.5 treatments a mean clearance of 100% was achieved in 90% of the patients. One patient (5%) showed a clearance of 50% and another showed no improvement. The subungual or periungual location of the wart had no influence on the number of treatments or end result (P > 0.05). There were two recurrences during the mean follow-up period of 5.9 months (SD: 7.6). Besides mainly pain and hyperpigmentation, most treatments had no side-effects. CONCLUSION: PDT can offer a good alternative for treating periungual warts of the hands. Larger studies are indicated.  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