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   13473篇
  免费   1033篇
  国内免费   317篇
耳鼻咽喉   113篇
儿科学   61篇
妇产科学   159篇
基础医学   421篇
口腔科学   308篇
临床医学   1700篇
内科学   503篇
皮肤病学   59篇
神经病学   236篇
特种医学   300篇
外国民族医学   2篇
外科学   4091篇
综合类   3927篇
预防医学   657篇
眼科学   289篇
药学   1532篇
  45篇
中国医学   279篇
肿瘤学   141篇
  2024年   130篇
  2023年   252篇
  2022年   393篇
  2021年   496篇
  2020年   536篇
  2019年   414篇
  2018年   401篇
  2017年   460篇
  2016年   493篇
  2015年   504篇
  2014年   1066篇
  2013年   844篇
  2012年   973篇
  2011年   1003篇
  2010年   819篇
  2009年   738篇
  2008年   654篇
  2007年   693篇
  2006年   633篇
  2005年   595篇
  2004年   348篇
  2003年   306篇
  2002年   298篇
  2001年   245篇
  2000年   191篇
  1999年   165篇
  1998年   140篇
  1997年   137篇
  1996年   102篇
  1995年   115篇
  1994年   77篇
  1993年   76篇
  1992年   54篇
  1991年   78篇
  1990年   62篇
  1989年   51篇
  1988年   54篇
  1987年   59篇
  1986年   40篇
  1985年   32篇
  1984年   25篇
  1983年   19篇
  1982年   8篇
  1981年   10篇
  1980年   13篇
  1979年   4篇
  1978年   3篇
  1977年   5篇
  1975年   1篇
  1974年   6篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
目的:回顾性研究两步肿胀麻醉方法在经腋窝胸大肌后隆乳术中的应用效果.方法:肿胀麻醉方法分两步完成.第一步:切口及胸大肌后方路径肿胀麻醉,切开皮肤,皮下组织,分离到达胸大肌后间隙.第二步,用手指导引长钝头注射针进入胸大肌后间隙,将肿胀麻醉液直接注射到胸大肌在内、下、外侧的起始点,实现拟剥离腔隙周边直接浸润注射麻醉.结果:47例患者两步肿胀麻醉方法下完成了经腋窝胸大肌后的隆乳术,麻醉效果满意,不需要辅助静脉镇痛,手术过程无痛,无麻醉相关的并发症.结论:两步肿胀麻醉法简单,安全.可以为经腋窝胸大肌下隆乳手术提供良好的麻醉.  相似文献   
12.
对 2 45例 80岁以上老年病人髋关节手术的麻醉进行如下处理 :术前全面估计病人的全身情况和心、肺等重要脏器的功能状态 ,使病人的全身状态调整到最佳水平 ;首选连续硬膜外麻醉有其优点 ;小剂量、分次给药 ,避免麻醉阻滞平面过广 ;此手术创伤大 ,失血多 ,以及应用骨黏合剂 ,有可能出现心血管反应 ,应及时补充血容量 ,并纠正不良反应 ;肺组织退行性变 ,血氧分压降低 ,术中、术后常规吸氧 ;加强术后监测、护理 ,预防易发生的并发症  相似文献   
13.
We have previously found that halothane-relaxant anaesthesia in elderly patients causes a change towards a hyperkinetic circulation, with a decrease in the arterial-mixed venous oxygen content difference. This could be attributed to vasodilation. In the present study the splanchnic contribution to these changes was investigated. Nine patients were studied during halothane-relaxant anaesthesia prior to surgery. During anaesthesia splanchnic blood flow was markedly reduced, while splanchnic oxygen uptake decreased only moderately compared with the awake level. This resulted in an increase in splanchnic oxygen extraction. It is concluded that the splanchnic vascular bed does not contribute to the "hyperkinetic" circulation during halothane anaesthesia.  相似文献   
14.
The assumption that drugs used as unconditioned stimuli in conditioned taste aversion (CTA) studies act centrally was tested by comparing the effects of systemic and intracerebral injections of harmaline hydrochloride (H) in 340 rats. Intraperitoneal injection of 5–20 mg/kg but not of 2.5 mg/kg H administered 5 min after 15-min saccharin (0.1%) drinking decreased saccharin-water preference in a two-choice retention test, performed 48 h later, from 55% to 20%. Since CTA was not diminished when H (10 mg/kg) was injected into rats anesthetised immediately after saccharin drinking by pentobarbital (40 mg/kg), H (1.7–50 g) was administered intracerebrally to anesthetised rats fixed in the stereotaxic apparatus. Injection of 3–6 g H into the inferior olive elicited CTA comparable to that of systemic injection of 10 mg/kg H. Injections of 6 and 50 g H into cerebellum and bulbar reticular formation elicited weaker CTA while neocortical, hypothalamic and mesencephalic applications were ineffective. CTA could also be elicited when 50 g but not 6 g H was injected into the inferior olive 1 or 2 h after saccharin drinking. This delay-dependent effect and failure of non-contingent H administration to change saccharin preference indicates that the H-induced CTA is not contaminated by a non-specific increase in neophobia. It is concluded that H probably elicits CTA by activation of caudal bulbar structures, including the nucleus of the solitary tract, area postrema and lateral reticular formation.  相似文献   
15.
The ERAS guidelines are intended to identify, disseminate and promote the implementation of the best, scientific evidence-based actions to decrease variability in clinical practice. The implementation of these practices in the global clinical process will promote better outcomes and the shortening of hospital and critical care unit stays, thereby resulting in a reduction in costs and in greater efficiency. After completing a systematic review at each of the points of the perioperative process in cardiac surgery, recommendations have been developed based on the best scientific evidence currently available with the consensus of the scientific societies involved.  相似文献   
16.
17.
    
With the advent of automated anesthesia record keeping devices, concern has arisen that abnormal values will appear in the record and possibly lead to medicolegal compromise. A retrospective review of automated records from a series of anesthesia cases was undertaken to determine if abnormal values do occur, how frequent they are, and whether they cause problems. A total of 14,826 (4,942 each) noninvasive heart rate, systolic, and diastolic blood pressure readings from 118 case printouts generated by a Diatek Arkive Patient Information Management System (63 cases) or a Data-scope Datatrac record keeper (55 cases) were recorded. The study sample covered a broad range of surgical operations, anesthetic procedures, and patient ages and medical histories. During these 118 anesthetics, the majority of readings of all three variables fell within normal ranges (defined for this study as 80 to 180 and 50 to 110 mm Hg for systolic and diastolic blood pressures, respectively, and 60 to 140 beats/min for heart rate). During the anesthetics, 3.6% of the systolic pressure readings, 13.25% of the diastolic readings, and 4.25% of the heart rate readings were recorded outside these ranges. No serious intraoperative or postoperative anesthesia complications were associated with these out-of-range readings, nor would they be expected in a sample of this size, since serious anesthetic complications are rare. This preliminary observation of one person's experience may help address the concern associated with allowing high and low blood pressure and heart rate readings to be automatically recorded unsmoothed. In medicolegal situations, it should also begin to demonstrate that such fluctuations are neither uncommon nor abnormal, and that a true record of these readings should be neither a cause for concern nor an opportunity for medicolegal exploitation.  相似文献   
18.
19.
20.
异丙酚氯胺酮混合液静脉麻醉   总被引:3,自引:0,他引:3  
选择 40例 ASA ~ 级病人行异丙酚氯胺酮 (1∶ 2 )复合静脉麻醉。结果麻醉诱导后血压、心率与麻醉前相比无明显变化 ,2 0 %病人出现一过性 SPO2 下降 (<94% )。麻醉诱导苏醒快 ,满意率高 ,恢复期无精神症状。表明异丙酚可控制氯胺酮的心血管兴奋作用和恢复期精神症状 ,氯胺酮可减轻异丙酚的心血管抑制作用。两者配伍是一种较好的短效静脉麻醉方式 ,但仍存在呼吸抑制作用 ,应引起注意。  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