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   1780篇
  免费   65篇
  国内免费   16篇
耳鼻咽喉   168篇
儿科学   51篇
妇产科学   101篇
基础医学   170篇
口腔科学   86篇
临床医学   102篇
内科学   73篇
皮肤病学   7篇
神经病学   157篇
特种医学   80篇
外科学   429篇
综合类   143篇
预防医学   39篇
眼科学   85篇
药学   58篇
  1篇
中国医学   13篇
肿瘤学   98篇
  2023年   31篇
  2022年   80篇
  2021年   91篇
  2020年   62篇
  2019年   61篇
  2018年   62篇
  2017年   60篇
  2016年   53篇
  2015年   57篇
  2014年   129篇
  2013年   134篇
  2012年   79篇
  2011年   120篇
  2010年   71篇
  2009年   88篇
  2008年   83篇
  2007年   79篇
  2006年   66篇
  2005年   55篇
  2004年   45篇
  2003年   35篇
  2002年   24篇
  2001年   30篇
  2000年   27篇
  1999年   21篇
  1998年   17篇
  1997年   24篇
  1996年   16篇
  1995年   11篇
  1994年   12篇
  1993年   12篇
  1992年   13篇
  1991年   5篇
  1990年   8篇
  1989年   6篇
  1988年   4篇
  1987年   12篇
  1986年   5篇
  1985年   6篇
  1984年   8篇
  1982年   8篇
  1981年   3篇
  1980年   8篇
  1979年   5篇
  1978年   3篇
  1977年   5篇
  1976年   3篇
  1975年   5篇
  1974年   6篇
  1972年   3篇
排序方式: 共有1861条查询结果,搜索用时 0 毫秒
1.
双侧内囊前肢毁损术治疗难治性强迫症疗效及随访研究   总被引:9,自引:0,他引:9  
目的 对难治性强迫症进行双侧内囊前肢毁损术治疗 ,评定手术疗效并进行 2年随访 ,以进一步探索脑外科手术对难治性强迫症的疗效 ,并探讨手术治疗的良好适应症。方法 对 2 8例难治性强迫症患者进行双侧内囊前肢毁损术治疗 ,并分别在手术前、手术后二周、手术后三月、手术后六月、手术后一年、手术后二年进行Y BOCS、HAMA、HAMD量表评定及术后疗效评定。结果  (1)强迫症患者手术后各期Y BOCS评分、HAMA评分与手术前比较均下降 ,有极显著差异 (P <0 .0 0 1) ;(2 )手术后各期Y BOCS的强迫思维评分均有明显下降 (P <0 .0 0 1) ,强迫行为在手术后 1年和 2年 ,与手术前比较无明显改变 (P >0 .0 5 ) ;(3)手术后 2年的总有效率为 5 3.5 % ,明显低于手术后 3月的总有效率 (P <0 .0 1)。结论 采用双侧内囊毁损术有相当的治疗效果 ,对于难治性强迫症患者可作为一种补充治疗手段 ;手术治疗对强迫行为的长期疗效较差 ,以严重的强迫思维为主的难治性强迫症患者为手术更好的适应症。  相似文献   
2.
A 21-year-old man was injured by a tailboard of a truck. He suffered a severe head injury with bilateral depressed skull fractures necessitating surgical decompression. On admission to the hospital the patient showed bending to pain stimuli (Glasgow Coma Score 5). Anisocoria was noticed from the beginning. Initial intracranial pressure (ICP), measured 3 hours after injury, was 30 mm Hg, and the cerebral perfusion pressure (CPP) was 70 mm Hg. During surgical elevation of the skull fracture on the right side an unexplainable rise of ICP to values of 100 mm Hg occurred, which corresponded to the mean arterial blood pressure (MAP). At the same time both pupils were dilated and fixed indicating a lack of cerebral perfusion. Due to immediate trephination of the opposite side, the ICP was lowered to values below 20 mm Hg, and sufficient cerebral perfusion (above 50 mm Hg) was regained. The patient showed a good recovery and was transferred to a rehabilitation center 5 weeks after injury.This case report emphasizes the importance of early and continuous intracranial pressure monitoring for adequate therapy in neurosurgical emergencies.  相似文献   
3.
The reverse U incision method has been employed for the correction of the unilateral cleft lip nose deformity for more than twenty years with satisfactory results. It has some columella lengthening effect and thus has proved to be useful for the correction of nasal deformities of bilateral cleft lip. To augment its columella lengthening effect a columella relaxation incision is added to the bilateral reverse U incision for the correction of the bilateral cleft lip nose deformity. This results in a reconstructed columella of satisfactory length and width.  相似文献   
4.
Summary The importance of the premaxillary position, size and shape in the development of the face and nose is discussed. The anthropological development of the premaxilla is studied. These factors are to be considered when cleft lip repairs are being planned and developed. Several cases are presented and discussed.  相似文献   
5.
Thirty randomly oriented T’s were presented in a circle around fixation at an eccentricity of 11° such that each T was crowded by its neighbors. Two locations within the same hemifield (unilateral condition) or one location in each hemifield (bilateral condition) were precued for subsequent probing. Observers were then asked to report the orientation of a target T at one of these locations. A bilateral field advantage was found: target identification was better when the two precued targets were in different hemifields than when they were within the same hemifield. This bilateral advantage was absent when only targets were presented, without any distracters. Further controls showed that this advantage could not be attributed to differences between horizontal and vertical target alignments or to visual field anisotropies. A similar bilateral advantage has been reported for multiple object tracking (Alvarez, G. A., & Cavanagh, P. (2005). Independent resources for attentional tracking in the left and right visual fields. Psychological Science 16(8), 637-643) and other attentional tasks. Our results suggest that crowding also demonstrates separate attentional resources in the left and right hemifields. There was a cost to attending to two targets presented unilaterally over attending to a single target. However, this cost was reduced when the two crowded targets were in separate hemifields.  相似文献   
6.
Abstract Background: Osteoporosis is characterized by low bone density and poor bone mineralization. Mid-diaphyseal stress (insufficiency) fractures of the femur caused by osteoporosis are rare. The symptoms of these lesions are vague and confusing. The physician must be alert to the possibility of femoral shaft stress fractures when evaluating an elderly patient complaining of back, hip or leg pain. Case Study: A 72-year-old osteoporotic female patient with bilateral mid-diaphyseal stress fractures of the femur is reported. The diagnosis of femoral shaft stress fracture in the elderly is very difficult when based on physical findings and plain radiography only. A magnetic resonance imaging (MRI) scan or nuclear scintigraphy is necessary for early diagnosis. In the described case, the patient had an excellent result after surgical treatment with intramedullary nails. Conclusion: MRI or nuclear scintigraphy must be obtained to exclude the possibility of femoral shaft stress fractures in the elderly. In the absence of contraindications, surgery is the best solution for this kind of lesion.  相似文献   
7.
Bilateral perioral sensory dysfunction due to unilateral cerebral lesion is rare, and has been thought to be caused by midline brainstem lesions. Six patients are described herewith, with bilateral perioral sensory symptoms due to unilateral strokes that do not involve the mid-brainstem region. Brain-computed tomographic scan and magnetic resonance imaging demonstrated unilateral cerebral strokes in the thalamus, posterior limb of the internal capsule, basal ganglia, fronto-parietal cortex and the insular-frontal subcortical area. This observation suggests that bilateral perioral sensory symptoms do not have a localizing value. Possible pathogenetic mechanisms for this sign are discussed.  相似文献   
8.
Rounded atelectasis, a rare, benign mass lesion, is most often seen in association with asbestos-related pleural changes. Often a presumptive diagnosis can be made on the basis of characteristic CT and chest radiographic findings. However, not infrequently radiographic imaging fails to differentiate rounded atelectasis from primary bronchogenic carcinoma, a disease which is seen with increased frequency in patients with asbestos exposure. We describe two cases where the diagnosis of rounded atelectasis was made by fine-needle aspiration (FNA) cytology. The cytologic features included abundant pulmonary parenchymal material with thickened alveolar walls containing pulmonary macrophages and connective tissue. It is important to realize that this is a useful positive finding indicating rounded atelectasis, rather than a negative finding suggesting the absence of neoplasm. Needles with a cutting action may be necessary to obtain sufficient material to make the diagnosis of rounded atelectasis.  相似文献   
9.
Bilateral discoid medial menisci is an extremely rare condition of the knee and it can be associated to other pathological findings, including anterior portion cyst formation. We report on the clinical features, radiographic findings, treatment and results of one patient who presented a bilateral medial discoid meniscus combined with posterior portion cyst of the left knee. To the best of the author’s knowledge, this is the first case of bilateral medial discoid meniscus associated with posterior portion cyst formation.  相似文献   
10.
文中总结了12例双侧声带麻痹或固定的治疗。气道通畅型2例,行病因治疗。气道阻塞型10例,8例作了气管切开术,声带外移术3例,2例呼吸发音功能恢复较好,1例失败者行一侧声带切除+喉扩张术。另外2例行T型管扩张术,均顺利拔管。药物治疗共5例。并讨论各种手术治疗现状。  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