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   450578篇
  免费   32800篇
  国内免费   9840篇
耳鼻咽喉   4479篇
儿科学   13904篇
妇产科学   8241篇
基础医学   37923篇
口腔科学   9791篇
临床医学   50016篇
内科学   68241篇
皮肤病学   10609篇
神经病学   21588篇
特种医学   9570篇
外国民族医学   35篇
外科学   46515篇
综合类   67288篇
现状与发展   26篇
一般理论   32篇
预防医学   47649篇
眼科学   6619篇
药学   40705篇
  455篇
中国医学   33953篇
肿瘤学   15579篇
  2023年   7438篇
  2022年   12459篇
  2021年   18400篇
  2020年   17377篇
  2019年   22382篇
  2018年   19964篇
  2017年   16821篇
  2016年   14761篇
  2015年   14103篇
  2014年   27084篇
  2013年   30117篇
  2012年   25141篇
  2011年   26929篇
  2010年   21344篇
  2009年   19777篇
  2008年   19165篇
  2007年   19643篇
  2006年   17320篇
  2005年   15155篇
  2004年   12457篇
  2003年   10768篇
  2002年   8475篇
  2001年   7729篇
  2000年   6270篇
  1999年   5578篇
  1998年   4550篇
  1997年   4339篇
  1996年   3774篇
  1995年   3554篇
  1994年   3356篇
  1993年   2778篇
  1992年   2739篇
  1991年   2383篇
  1990年   2087篇
  1989年   1922篇
  1988年   1791篇
  1987年   1519篇
  1986年   1400篇
  1985年   4167篇
  1984年   5129篇
  1983年   3525篇
  1982年   4075篇
  1981年   3747篇
  1980年   3348篇
  1979年   3048篇
  1978年   2632篇
  1977年   1998篇
  1976年   2242篇
  1975年   1682篇
  1974年   1448篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
胆囊切除术是公认的胆囊良性疾病的治愈手段,国内外学术界对于手术适应证和手术时机已有明确共识。近年来,“保胆手术”治疗胆囊良性疾病颇受热议,一些医生将“保护胆囊”的学术观点等同于“保留胆囊”的手术技术,这种误解可能导致病人出现差异性的预后。因此,临床医师应明晰“保护胆囊”理念与“保胆手术”的差别,对胆囊良性疾病的诊疗原则有正确的理解和应用。  相似文献   
22.
PurposeTo investigate the safety and efficacy of thyroid artery embolization (TAE) in the treatment of nodular goiter (NG).MethodsDuring a 5.5-year period, 56 consecutive patients with a NG underwent TAE. In Group A, there were 20 patients with a solitary/dominant 5–11-cm nodule, and in Group B, there were 36 patients with numerous nodules. Of the 56 patients, 47 (84%) had a retrosternal goiter and 25 had hyperthyroidism. In all patients, clinical and radiological evaluations were made at baseline and 6 months after TAE, and these parameters were statistically compared.ResultsIn 56 patients, 145 of the 146 thyroid arteries were successfully embolized. The 30-day mortality rate was 1.8%. Minor and major complications occurred in 25 and 2 patients, respectively. Six months after the TAE, the mean nodule volume was reduced from 80.2 mL to 25.0 mL, the mean thyroid volume was reduced from 147.0 mL to 62.6 mL, and the mean intrathoracic extension was reduced from 31.7 mm to 15.9 mm (P < .001). Of the 22 patients with non–Graves hyperthyroidism, 19 (86%) became euthyroid. The mean thyroid-related patient-reported outcome scores improved from 155.4 to 70.4 (P < .001). Of the 51 patients, 50 (98%) declared that they would recommend TAE to other patients with NG.ConclusionsTAE is safe and effective for the treatment of NG, with a significant volume reduction of the nodule(s) and thyroid gland.  相似文献   
23.
Acute Coma     
《Neurologic Clinics》2021,39(2):257-272
  相似文献   
24.
The teaching and clinical practice of professor Yves Pélicier contributed to the international development of a psychiatry centered on the whole of the person in a humanist approach. The theoretical developments were marked by the authenticity of the practice of the therapist and its deep sense of the human being thus truly founding a School.  相似文献   
25.
《Clinical neurophysiology》2021,132(9):2003-2011
ObjectiveA large N20 and P25 of the median nerve somatosensory evoked potential (SEP) predicts short survival in amyotrophic lateral sclerosis (ALS). We investigated whether high frequency oscillations (HFOs) over N20 are enlarged and associated with survival in ALS.MethodsA total of 145 patients with ALS and 57 healthy subjects were studied. We recorded the median nerve SEP and measured the onset-to-peak amplitude of N20 (N20o-p), and peak-to-peak amplitude between N20 and P25 (N20p-P25p). We obtained early and late HFO potentials by filtering SEP between 500 and 1 kHz, and measured the peak-to-peak amplitude. We followed up patients until endpoints (death or tracheostomy) and analyzed the relationship between SEP or HFO amplitudes and survival using a Cox analysis.ResultsPatients showed larger N20o-p, N20p-P25p, and early and late HFO amplitudes than the control values. N20p-P25p was associated with survival periods (p = 0.0004), while early and late HFO amplitudes showed no significant association with survival (p = 0.4307, and p = 0.6858, respectively).ConclusionsThe HFO amplitude in ALS is increased, but does not predict survival.SignificanceThe enlarged HFOs in ALS might be a compensatory phenomenon to the hyperexcitability of the sensory cortex pyramidal neurons.  相似文献   
26.
27.
《Immunity》2022,55(9):1725-1731.e4
  1. Download : Download high-res image (182KB)
  2. Download : Download full-size image
  相似文献   
28.
PurposeTo review and to compare indirectly the outcomes of minimally invasive therapies for the treatment of lower urinary tract symptoms secondary to benign prostatic hyperplasia.Materials and MethodsA literature search via Medline and Cochrane Central databases was completed for randomized control studies published between January 2000 to April 2020 for the following therapies: Rezum, Urolift, Aquablation, and prostatic artery embolization (PAE). Data on the following variables were included: International prostate symptom score (IPSS), maximum urinary flow rate, quality of life, and postvoid residual (PVR). Standard mean differences between treatments were compared through a meta-analysis using transurethral resection of the prostate (TURP) to assess differences in treatment effect.ResultsThere was no significant difference in outcomes between therapies for IPSS at the 3, 6, and 12-month follow ups. Although outcomes for Rezum were only available out to 3 months, there were no consistently significant differences in outcomes when comparing Aquablation versus PAE versus Rezum. TURP PVR was significantly better than Urolift at 3, 6, and 12 months. No significant differences in minor or major adverse events were noted.ConclusionAlthough significant differences in outcomes were limited, Aquablation and PAE were the most durable at 12 months. PAE has been well studied on multiple randomized control trials with minimal adverse events while Aquablation has limited high quality data and has been associated with bleeding-related complications.  相似文献   
29.
30.
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