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   1551篇
  免费   78篇
  国内免费   5篇
耳鼻咽喉   8篇
儿科学   33篇
妇产科学   20篇
基础医学   186篇
口腔科学   48篇
临床医学   84篇
内科学   394篇
皮肤病学   11篇
神经病学   62篇
特种医学   113篇
外科学   325篇
综合类   3篇
预防医学   43篇
眼科学   9篇
药学   77篇
中国医学   2篇
肿瘤学   216篇
  2023年   11篇
  2022年   21篇
  2021年   51篇
  2020年   27篇
  2019年   21篇
  2018年   28篇
  2017年   34篇
  2016年   25篇
  2015年   42篇
  2014年   59篇
  2013年   33篇
  2012年   77篇
  2011年   65篇
  2010年   45篇
  2009年   29篇
  2008年   64篇
  2007年   60篇
  2006年   37篇
  2005年   54篇
  2004年   45篇
  2003年   43篇
  2002年   58篇
  2001年   43篇
  2000年   40篇
  1999年   56篇
  1998年   10篇
  1997年   23篇
  1996年   14篇
  1995年   18篇
  1994年   16篇
  1993年   15篇
  1992年   46篇
  1991年   38篇
  1990年   27篇
  1989年   55篇
  1988年   36篇
  1987年   41篇
  1986年   39篇
  1985年   39篇
  1984年   40篇
  1983年   21篇
  1982年   10篇
  1981年   6篇
  1980年   7篇
  1979年   16篇
  1978年   5篇
  1977年   11篇
  1976年   9篇
  1972年   5篇
  1966年   4篇
排序方式: 共有1634条查询结果,搜索用时 397 毫秒
41.
42.
43.
The vascular type of Ehlers-Danlos syndrome (vEDS) is an autosomal dominant hereditary disease characterized by connective tissue fragility throughout the body, including the arteries, viscera, and gastrointestinal tract. We report a case in which we performed transvenous embolization (TVE) via direct superior ophthalmic vein (SOV) approach to treat a direct carotid-cavernous fistula (CCF) in a patient with Ehlers-Danlos syndrome (EDS). The patient was a 37-year-old woman who developed tinnitus in her left ear and a headache during examination in the outpatient clinic of another hospital in order to make a definitive diagnosis of vEDS, and she was referred to our hospital and examined. Based on the results of all of the studies she was diagnosed with a CCF. Conservative treatment was attempted, but was not very effective. Because of progressing aphasia, TVE was performed via the SOV direct cut. There were no intraoperative or postoperative complications. It has been reported that cerebral angiography is generally contraindicated in vEDS and that the morbimortality associated with endovascular treatment is very high. When performing treatment it is necessary to be sufficiently aware of the risks it entails.  相似文献   
44.
In order to investigate whether the size of thecaudate lobe of the cirrhotic liver is related to thehepatic functional reserve, the morphometric analysis ofthe caudate lobe was preformed retrospectively using computed tomography in 106 consecutivepatients of whom 67 had compensated (group 1), and 39uncompensated (group 2) liver cirrhosis. In 51 patients,hepatic measurements were repeated in follow-up. Age- and gender-matched controls were studied.The size of the caudate lobe and the ratio of thecaudate to right lobe were correlated with liverfunction. The caudate lobe was larger in the studypatients than in the controls, and larger in group 1than in group 2 (P < 0.01). The caudate to right loberatios were also greater in the study patientsespecially in group 1 (P < 0.01). In follow-up, the regression coefficient for the caudate to rightlobe ratio was positive in group 1 and negative in group2 (P < 0.05). Even though the caudate lobe ofpatients with uncompensated liver cirrhosis was larger than that of the controls, patients withcompensated liver cirrhosis had a larger caudate lobeand higher caudate to right lobe ratio compared to thepatients with uncompensated liver cirrhosis. The caudate lobe may have played an importantrole in maintaining proper liver function in thesepatients.  相似文献   
45.
Shiota Y  Arikita H  Horita N  Hiyama J  Ono T  Ohkawa S  Yamakido M 《Chest》2002,121(2):652-654
We report two cases of septic pulmonary embolism associated with periodontitis. Chest CT revealed multiple nodular shadows with features characteristic of septic pulmonary embolism in both patients. Both patients had toothache, fever, and chest pain, and showed findings of periodontitis at initial presentation. Antimicrobial agents combined with dental surgery were successful in treatment. While septic pulmonary embolism from the lesions of periodontitis appears to be rare, periodontitis remains important in the differential diagnosis of septic pulmonary embolism.  相似文献   
46.
BackgroundClinical significance of left atrial (LA) function and geometry in patients with dilated cardiomyopathy (DCM) remains uncertain.HypothesisLA geometric parameters assessed by cardiac magnetic resonance (CMR) predict the prognosis in patients with DCM.MethodsThe present study included patients with DCM and sinus rhythm who underwent CMR between December 2007 and April 2018. LA volume was measured using CMR. LA sphericity index was computed as the ratio of the measured maximum LA volume by the volume of a sphere with maximum LA length diameter.ResultsWe included 255 patients in this study. During the mean follow‐up of 3.92 years, hospitalization for HF occurred in 37 patients. The LA sphericity index was significantly higher in patients with hospitalization for HF than in those without (0.78 ± 0.35 vs. 0.58 ± 0.18, p < .001). Multivariable Cox regression analysis identified a higher LA sphericity index as an independent predictor of hospitalization for HF. Patients were categorized based on the median of LA sphericity index. The Kaplan–Meier curve showed that patients with a high LA sphericity index (≥0.57) had a significantly higher risk of hospitalization for HF than those with a low LA sphericity index (<0.57).ConclusionLA sphericity index was an independent predictor of hospitalization for HF. Assessment of LA geometric parameters might be useful for risk stratification in patients with DCM.  相似文献   
47.
We investigated 32 patients with bacteremia that occurred in the Department of Urology, School of Medicine, Kanazawa University between April, 1983 and March, 1989. This incidence represented 1.9% of the total number of inpatients. The study group comprised 29 males and 3 females, and their age varied from 25 to 82 years with a mean age of 61.7 years. Twenty-two (75%) of the 32 patients had urologic malignancies. The majority of patients were compromised hosts who had one or more (average, 3.8) factors that promoted bacteremia. Urinary tract infections existed in 26 (86.0%) patients before the bacteremic episode and urine cultures revealed a species identical to that simultaneously isolated from the blood in 19 (73.1%) of the 26 patients. Out of the 26 patients, there were 22 (84.6%) with complicated pyelonephritis and 22 (84.6%) with an indwelling urinary tract catheter. In blood cultures, the most common isolate was Staphylococcus epidermidis and gram-positive cocci were cultured at a rate of 43.9% which was higher than that (39.0%) of gram-negative rods. In contrast, in urine cultures, gram-negative rods were isolated predominantly. S. epidermidis and Corynebacterium spp. isolated less frequently in blood than in urine, indicated contaminants. However, Enterococcus spp. and Candida albicans were recognized as causative organisms of bacteremia via the urinary tract, because the urine culture demonstrated a species identical to that obtained from blood in these bacteremic patients. Antibiotic sensitivity tests demonstrated that isolates from blood tended to show tolerance to beta-lactam antibiotics, but had good sensitivity to aminoglycosides.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
48.
Abstract: In the present study, we investigated the role of the spleen in experimental hepatic ischemia/reperfusion in the rat. After a 90-min period of ischemia in the left and middle hepatic lobes, the ischemia was released and the liver was reperfused for up to 24 h. Plasma alanine aminotransferase reached a peak 3 h after the onset of reperfusion, and gradually decreased thereafter. A histological examination revealed evidence of hepatocellular necrosis and degeneration, especially 24 h after the onset of reperfusion. In addition, there was a noticeable accumulation of polymorphonuclear cells in the liver following ischemia/reperfusion. A splenectomy performed just prior to ischemia/reperfusion reduced both biochemical and histological hepatocellular injury. The number of polymorphonuclear cells in the liver following ischemia/reperfusion was significantly reduced in rats subjected to splenectomy, suggesting that the increase in polymorphonuclear cells may contribute to liver injury. The number of mononuclear cells also increased in the marginal zones of the spleen following ischemia/reperfusion, and appeared to be derived from the splenic monocyte/macrophage population, based on immunohistochemical studies. The spleen plays an important role in the pathogenesis of hepatic ischemia/reperfusion injury and the splenic monocyte/macrophage population contributes to liver damage.  相似文献   
49.
Clinical Autonomic Research - Delayed orthostatic hypotension (DOH), a fall in blood pressure after a 3-min cutoff, is clinically meaningful. The aim of this study was to elucidate the clinical and...  相似文献   
50.
Solitary pulmonary capillary hemangioma (SPCH) is a rare benign lung tumor that must be distinguished from small and early lung cancers. Here, we report a case of SPCH for which we performed frozen section diagnosis. The patient was a 55‐year‐old Japanese woman. Five years before the operation, mixed ground‐glass opacity was detected by computed tomography in the left posterior basal segment of the lower lobe (S10). Because the interior tumor density of the ground‐glass opacity increased slightly, video‐assisted thoracic surgery wedge resection was performed. Frozen section diagnosis revealed a benign tumor without proliferation of atypical epithelial cells. The tumor had narrow alveolar lumens, thickened alveolar septa and a clear boundary separating it from normal lung tissue. The proliferated lumens varied in size and were lined with single layers of flat cells. After the operation, immunohistochemical staining of a paraffin section revealed that the thickened alveolar septa resulted from the proliferation of capillary vessels, the flat cells of which were positive for CD31 and CD34 and negative for podoplanin; the tumor was diagnosed as SPCH. Here, we discuss the pathological features of SPCH on frozen sections with reference to this case and review previous related reports.  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