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   1819篇
  免费   112篇
  国内免费   6篇
耳鼻咽喉   93篇
儿科学   32篇
妇产科学   26篇
基础医学   213篇
口腔科学   45篇
临床医学   162篇
内科学   395篇
皮肤病学   63篇
神经病学   95篇
特种医学   46篇
外科学   284篇
综合类   4篇
预防医学   65篇
眼科学   89篇
药学   136篇
中国医学   9篇
肿瘤学   180篇
  2023年   18篇
  2022年   42篇
  2021年   73篇
  2020年   41篇
  2019年   44篇
  2018年   54篇
  2017年   48篇
  2016年   43篇
  2015年   50篇
  2014年   65篇
  2013年   67篇
  2012年   88篇
  2011年   91篇
  2010年   52篇
  2009年   54篇
  2008年   103篇
  2007年   89篇
  2006年   84篇
  2005年   82篇
  2004年   72篇
  2003年   88篇
  2002年   96篇
  2001年   38篇
  2000年   40篇
  1999年   27篇
  1998年   8篇
  1997年   9篇
  1996年   18篇
  1992年   19篇
  1991年   25篇
  1990年   20篇
  1989年   17篇
  1988年   15篇
  1987年   20篇
  1986年   24篇
  1985年   21篇
  1984年   21篇
  1983年   18篇
  1982年   8篇
  1979年   12篇
  1978年   9篇
  1975年   10篇
  1974年   7篇
  1973年   9篇
  1972年   8篇
  1971年   7篇
  1969年   8篇
  1968年   12篇
  1967年   8篇
  1966年   12篇
排序方式: 共有1937条查询结果,搜索用时 15 毫秒
991.
992.
993.
Neurological Sciences - The Alzheimer Disease Assessment Scale (Japanese version) cognitive subscale (ADAS-Jcog) is composed of a number of subscale tasks. However, it is not clear which subscale...  相似文献   
994.
A 60-year-old man presented with diarrhea and weight loss. Colonoscopy revealed multiple reddish polypoid lesions throughout the gastrointestinal tract and was diagnosed as Cronkhite-Canada syndrome (CCS). Prednisolone therapy caused regression of polyps. Some of them were suspected to be early colon cancers and adenomas. We endoscopically performed mucosal resection for 15 polyps after prednisolone therapy. Histological examination of one of polyps showed invasion of the submucosal layer and colon resection was performed. This case suggests that diagnosis and treatment are important in polyps of CCS.  相似文献   
995.
996.

Aims/Introduction

To clarify the association between perioperative variables and postoperative bleeding in pars plana vitrectomy for vitreous hemorrhage in diabetic retinopathy.

Materials and Methods

The present retrospective study enrolled 72 eyes of 64 patients who were admitted to Osaka University Hospital between April 2010 and March 2014, and underwent vitrectomy for vitreous hemorrhage as a result of diabetic retinopathy.

Results

Postoperative bleeding developed in 12 eyes. Using binomial logistic regression analysis, we found that the duration of operation was the only significant variable associated with postoperative bleeding within 12 weeks after vitrectomy. Furthermore, Poisson regression analysis identified fasting blood glucose just before vitrectomy, no treatment with antiplatelet drugs and treatment with antihypertensive drugs, as well as duration of operation, to be significantly associated with the frequency of bleeding within 52 weeks after vitrectomy.

Conclusions

Long duration of operation can be used to predict bleeding within both 12 and 52 weeks after vitrectomy. In addition, fasting blood glucose just before vitrectomy, no treatment with antiplatelet drugs and treatment with antihypertensive drugs might be risk factors for postoperative bleeding up to 1 year after vitrectomy.  相似文献   
997.
While aspiration pneumonia constitutes the majority of pneumonia cases in the elderly, it remains highly underdiagnosed. We experienced a case of recurrent pneumonia and chronic cough that was later diagnosed as aspiration pneumonia and diffuse aspiration bronchiolitis (DAB) due to recurrent hemorrhaging from an intramedullary cavernous malformation. The patient was finally diagnosed when life-threatening respiratory depression caused emergency attention. This is the first report of hemorrhaging from an intramedullary cavernous malformation diagnosed due to aspiration pneumonia and DAB. These findings highlight the importance of considering aspiration in cases with recurrent pneumonia or chronic cough. The underlying cause may be a life-threatening condition.  相似文献   
998.
Immunoglobulin A nephropathy (IgAN) is a form of chronic glomerulonephritis that can cause end-stage renal disease. Recently, tonsillectomy combined with corticosteroid pulse (TSP) has been shown to be effective for achieving clinical remission and favorable renal outcome in patients with IgAN. However, the standard regimen of corticosteroid use in TSP has not been established. Herein, we compared the effect of single- or triple-course steroid pulse therapy combined with tonsillectomy in patients with IgAN.This retrospective, observational cohort study included 122 patients with IgAN enrolled from January 2004 to December 2018 at 2 independent institutions. We divided the patients into 2 groups; single-course (TSP1: n = 70) and triple-course (TSP3: n = 52) of corticosteroid pulse therapy (1 course comprised 3 consecutive days’ infusion of 0.5 g methylprednisolone) combined with tonsillectomy. The primary outcome for renal survival was defined as the first occurrence of ≧30% decrease in estimated glomerular filtration rate from baseline. Secondary outcomes included the incidence of clinical remission and recurrence of the disease.Regarding clinical parameters and findings at baseline, there were no significant differences between the 2 groups. The 8-years renal survival in the 2 groups was not significantly different according to Kaplan–Meier curves (TSP1; 82.5% vs TSP3; 69.2%, log-rank test P = .39). The cumulative incidence rates of remission of hematuria (94.4% vs 85.4%, P = .56) and clinical remission (85.0% vs 64.8%, P = .07) were comparable in both groups, while those of proteinuria showed higher rates in TSP1 than TSP3 (88.4% vs 65.4%, P = .02). The cumulative incidence of relapse of hematuria (5.6% vs 2.3%, P = .42) and proteinuria (7.1% vs 3.3%, P = .41) showed no significant differences in the 2 groups. Cox regression analyses showed that the number of courses of corticosteroid pulse therapy was not significantly associated with renal outcome (TSP1 vs TSP3; Hazard ratios 0.69, 95% confidence intervals 0.29-1.64, P = .39).The effect of single-course corticosteroid pulse therapy is not statistically, significantly different from triple-course in TSP protocol for improving renal outcome and preventing relapse in patients with IgAN. Single-course corticosteroid pulse therapy may become a treatment option for patients with IgAN.  相似文献   
999.

Purpose

The latest resuscitation guidelines recommend the use of amiodarone in adult patients with out-of-hospital cardiac arrest (OHCA) and refractory ventricular fibrillation (VF) to improve the rates of return of spontaneous circulation. However, there is limited evidence to suggest that amiodarone is superior to lidocaine with respect to survival at discharge. The purpose of the present study was to evaluate the hypothesis that amiodarone is superior to lidocaine with regard to the rate of survival to hospital discharge for OHCA patients with VF/pulseless VT (pVT) on hospital arrival.

Methods

Using the Japanese Diagnosis Procedure Combination inpatient database, we identified 3951 patients from 795 hospitals who experienced cardiogenic OHCA and had refractory ventricular fibrillation on hospital arrival between July 2007 and March 2013. The patients were categorized into amiodarone (n = 1743) and lidocaine (n = 2208) groups, from which 801 propensity score-matched pairs were generated.

Results

There was no significant difference in the rate of survival to hospital discharge between the amiodarone and lidocaine groups (15.2 % vs. 17.1 %; difference, ?1.9 %; 95 % CI, ?5.5 to 1.7) in propensity score-matched analyses. Cox regression analyses did not indicate significant in-hospital mortality differences between the amiodarone and lidocaine groups for the propensity score-matched groups (hazard ratio, 1.05; 95 % CI, 0.94 to 1.17).

Conclusions

The present nationwide study suggested that there was no significant difference in the rate of survival to hospital discharge between cardiogenic OHCA patients with persistent ventricular fibrillation on hospital arrival treated with amiodarone or lidocaine.
  相似文献   
1000.
5-Aminosalicylic acid preparations have been used as first-line drugs for treatment of ulcerative colitis (UC). However, some patients with UC present with exacerbation of symptoms because of allergy to mesalazine. Diagnosis of mesalazine allergy in active UC may be challenging because its symptoms mimic those of UC. Here we describe a 13-year-old boy with mesalazine allergy who achieved remission when his medication was changed from mesalazine to salazosulfapyridine. During his clinical course mesalazine was prescribed twice, and on each occasion exacerbation of the symptoms occurred. We considered a diagnosis of mesalazine allergy, and this was confirmed by a drug lymphocyte stimulation test; the result for salazosulfapyridine was negative. On the basis of criteria involving simple mucosal biopsy combined with endoscopy for predicting patients with UC who would ultimately require surgery, we considered that the UC in this case might be susceptible to steroid treatment, and we therefore treated the patient with salazosulfapyridine and prednisolone. Shortly afterwards, remission was achieved and the patient has remained in good condition on salazosulfapyridine alone. When treating patients with mesalazine, the possibility of allergy should always be borne in mind, especially when the clinical course is inconsistent with the results of biopsy.  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