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   1516篇
  免费   59篇
  国内免费   77篇
耳鼻咽喉   1篇
儿科学   19篇
妇产科学   2篇
基础医学   89篇
口腔科学   8篇
临床医学   218篇
内科学   255篇
皮肤病学   26篇
神经病学   55篇
特种医学   38篇
外科学   473篇
综合类   190篇
预防医学   162篇
眼科学   4篇
药学   58篇
中国医学   33篇
肿瘤学   21篇
  2024年   4篇
  2023年   22篇
  2022年   48篇
  2021年   61篇
  2020年   52篇
  2019年   63篇
  2018年   54篇
  2017年   36篇
  2016年   58篇
  2015年   45篇
  2014年   108篇
  2013年   101篇
  2012年   87篇
  2011年   111篇
  2010年   120篇
  2009年   121篇
  2008年   101篇
  2007年   87篇
  2006年   82篇
  2005年   45篇
  2004年   35篇
  2003年   33篇
  2002年   29篇
  2001年   24篇
  2000年   24篇
  1999年   16篇
  1998年   13篇
  1997年   11篇
  1996年   15篇
  1995年   13篇
  1994年   9篇
  1993年   3篇
  1992年   10篇
  1991年   1篇
  1990年   1篇
  1989年   1篇
  1988年   3篇
  1987年   2篇
  1985年   2篇
  1978年   1篇
排序方式: 共有1652条查询结果,搜索用时 15 毫秒
1.
2.
经腹膜后隙途径腹腔镜活体供肾切取32例   总被引:5,自引:4,他引:1  
目的 探讨经腹膜后隙途径腹腔镜活体供肾切取的技术和效果。方法 32名供者中,男性15名,女性17名。29例取左肾,3例取右肾。供者全身麻醉,取侧卧位,共选3个穿刺点,第1个穿刺点选在12肋缘下2cm与骶棘肌外侧缘1cm交叉点,第2个穿刺点选在第1个穿刺点向前8~10cm,或肋缘下2cm与腋前线交叉点,第3个穿刺点位于髂棘上2cm与腋中线交叉点,分别插入12mm、10mm和5mm的Trocar。以自制水囊扩张器扩张腹膜后隙,游离供肾和输尿管,前6例用直线切割缝合器切断肾动脉和静脉,后26例用带锁的塑料夹夹闭切断肾动脉和静脉,在第1个穿刺点向下的延长切口将肾取出。结果 32只供肾切取顺利,手术耗时60~180min,出血量20~200ml,供肾热缺血时间3~8min,冷缺血时间25~50min。3只肾静脉较短,分别为1cm、1.5cm和2cm,另有1只供肾动脉内膜损伤。移植术后第1d,受者的尿量为2800-10 100ml,无移植肾功能恢复延迟发生。结论 经腹膜后隙途径腹腔镜活体供肾切取是安全、可行的,对供者创伤小,所获供肾的质量较好,但要求有熟练的腹腔镜技术。  相似文献   
3.
The peak endocardial acceleration (PEA, unit g) shows a near correlation with myocardial contractility during the isometric systolic contraction of the heart (dP/dtmax), with sympathetic activity and, thus, with physiological heart rate modulation. The (Biomechanical Endocardial Sorin Transducer (BEST) sensor is incorporated in the tip of a pacing lead and measures PEA directly near the myocardium. In an international study, the lead was implanted with the dual chamber pacemaker Living-1 (Sorin) in 105 patients. The behavior of the PEA signal was tested under conditions of physical and mental stress and during daily life activities by 24-hour recordings of PEA (PEA Holter) at 1 to 2 months and approximately 1 year after implantation. Implantation of the BEST lead was performed without complications in all patients. The sensor functioned properly in the short- and long-term in 98% of patients. Although PEA values differed from patient to patient, the values closely reflected the variations in sympathetic activity due to physical and mental stress in each patient. During exercise and during daily life activities a close correlation between PEA and heart rate was observed among patients with normal sinus rhythm. Peak endocardial acceleration allows a nearly physiological control of the pacing rate.  相似文献   
4.
目的:探讨行为干预对精神分裂症应对方式和生活质量的作用。方法:将入组患者随机分为实验组和对照组,对实验组患者进行为期一年的行为干预,研究结束时分别用简易应对方式问卷和综合生活质量量表进行评定。结果:实验组复发率和服药依从性与对照组相比均有显著差异(X2=4.29,p<0.05 X2=8.95,p<0.005)。实验组积极、消极应对因子与对照组相比差异显著(t=2.24,p<0.05.t=-2.46,p<0.05)。实验组躯体功能、心理功能、社会功能各维度分与对照组相比均有显著差异(t=2.25~2.92,p<0.05~p<0.01)。结论:对精神分裂症患者进行行为干预可提高患者的应对能力,减少复发,提高生活质量。  相似文献   
5.
This article, based on a report prepared for the International Council of Ophthalmology (ICO) and the International Society for Low Vision Research and Rehabilitation (ISLRR), explores the assessment of various aspects of visual functioning as needed to document the outcomes of vision rehabilitation. Documenting patient abilities and functional vision (how the person functions) is distinct from the measurement of visual functions (how the eye functions) and also from the assessment of quality of life. All three areas are important, but their assessment should not be mixed. Observation of task performance offers the most objective measure of functional vision, but it is time‐consuming and not feasible for many tasks. Where possible, timing and error rates provide an easy score. Patient response questionnaires provide an alternative. They may save time and can cover a wider area, but the responses are subjective and proper scoring presents problems. Simple Likert scoring still predominates but Rasch analysis, needed to provide better result scales, is gaining ground. Selection of questions is another problem. If the range of difficulties does not match the range of patient abilities, and if the difficulties are not distributed evenly, the results are not optimal. This may be an argument to use different outcome questions for different conditions. Generic questionnaires are appropriate for the assessment of generic quality of life, but not for specific rehabilitation outcomes. Different questionnaires are also needed for screening, intake and outcomes. Intake questions must be relevant to actual needs to allow prioritization of rehabilitation goals; the activity inventory presents a prototype. Outcome questions should be targeted at predefined rehabilitation goals. The Appendix cites some promising examples. The Low Vision Intervention Trial (LOVIT) is an example of a properly designed randomized control study, and has demonstrated the remarkable effectiveness of vision rehabilitation. It is hoped that further similar studies will follow.  相似文献   
6.
目的探讨亲属活体部分小肠移植术后早期并发症的防治。方法为3例短肠综合征患者和1例肠神经节缺失导致小肠无功能患者施行亲属活体部分小肠移植术,供、受者HLA配型均有4个以上抗原相合,供肠均取自回肠末端,长度为(150±10)cm,应用他克莫司、霉酚酸酯及甲泼尼龙预防排斥反应。术后采取抗凝、改善微循环、输注人白蛋白等措施调控患者的出、凝血功能,预防血管吻合口血栓形成和出血,给予法莫替丁或奥美拉唑预防应激性溃疡;给予头孢三代为主的抗生素、更昔洛韦以及氟康唑预防细菌、病毒及真菌感染,并注重对体表易感染部的消毒和护理;术后鼓励患者多下床活动,早期给予谷氨酰胺,尽早将营养支持治疗过渡为肠内营养,以促进移植肠功能的恢复。结果术后3d,1例患者发生肺部鲍曼不动杆菌感染,经抗生素治疗后控制。1例术后5 d移植肠系膜根部出现血肿,手术清除血肿。2例消化道分泌物及大便中发现真菌生长,给予氟康唑治疗后好转。4例在术后20 d左右均发生急性排斥反应,经加大FK506的用量,并以甲泼尼龙冲击治疗后逆转。4例患者,2例获得长期存活,至今分别存活6年8个月和3年2个月,另2例分别于术后5个月、35 d因感染死亡。结论小肠移植术后早期的并发症较多,与小肠的生理结构有关,术后早期并发症的成功防治是临床小肠移植成败的关键。  相似文献   
7.
Objectives: This study examines the efficacy of the predicting power for hospital mortality and functional outcome of three different scoring systems for head injury in a neurosurgical intensive care unit (NICU). Design: On the day of admission, data were collected from each patient to compute the Acute Physiology, Age, and Chronic Health Evaluation (APACHE) II and III, and Glasgow Coma Scale (GCS) scores. Hospital mortality was defined as the deaths of patients before discharge from hospital. Early mortality was defined as death before the 14th day after admission. Late mortality was defined as death after the 15th day from admission. Functional outcome was evaluated by Index of Independence in Activities of Daily Living (Index of ADL). Setting: An 8-bed NICU in a 1270-bed medical center in Taichung Veterans General Hospital. Patients and participants: Two hundred non-selected patients with acute head injury were included in our study in a consecutive period of 2 years. Patients less than 14 years old were not included. Interventions: None. Measurements and results: Sensitivity, specificity and correct prediction outcome were measured by the chi-square method in three scoring systems. The Youden index was also obtained. The best cut-off point in each scoring system was determined by the Youden index. The difference in Youden index was calculated by Z score. A difference was also considered if the probability value was less than 0.05. The area under Receiver Operating Characteristic (ROC) curve was computed. Then the area under ROC of each scoring system was compared by Z score. There was statistical significance if p was less than 0.05. For prediction of hospital mortality, the best cut-off points are 55 for APACHE III, 17 for APACHE II and 5 for GCS. The correct prediction outcome is 82.4% in APACHE III, 78.4% in APACHE II and 81.9% in the GCS. The Youden index has best cut-off points at 0.68 for APACHE III, 0.59 for APACHE II, and 0.56 for GCS. The area under Receiver Operating Characteristic (ROC) curve is 0.90 in the APACHE III, 0.84 in the APACHE II and 0.86 in the GCS. There are no statistical differences among APACHE III and II, and GCS in terms of correct prediction outcome, Youden Index and the area under the ROC curve. Other physiological variables excluding GCS in APACHE III and II (AP III-GCS, AP II-GCS) have less statistical value in the determination of mortality for acute head injury. For the prediction of late mortality, APACHE III and II yield significantly better results in the area under the ROC curve, correct prediction and Youden index than those of GCS. Other physiological variables (AP III-GCS and AP II-GCS) play an important role in the prediction of late mortality in APACHE scores. For prediction of the functional outcome of surviving patients with acute head injury, the APACHE III yields the best results of correct prediction outcome, Youden index and the area under the ROC curve. Conclusion: The APACHE III and II may not replace the role of GCS in cases of acute head injury for hospital or early mortality assessment. But for prediction of the late mortality, the APACHE III and II have better accuracy than GCS. Other physiological variables excluding GCS in the APACHE system play a crucial contribution for late mortality. GCS is simple, less time-consuming and economical for patients with acute head injury for the prediction of hospital and early mortality. The APACHE III provides better prediction for severe morbidity than GCS and APACHE II. Therefore, the APACHE III provides a good assessment not only for hospital and late mortality, but also for functional outcome. Received: 22 May 1995 Accepted: 2 September 1996  相似文献   
8.
手辅助腹腔镜取肾的实验研究   总被引:2,自引:0,他引:2  
目的 探索和运用手辅助腹腔镜技术切除供肾并行肾移植术 ,了解该方法的优缺点及临床应用的可行性。方法 用成年狗作动物实验进行手辅助腹腔镜供肾切除术并移植 ,观察并记录手术时间 ,供肾热缺血时间 ,移植肾功能恢复情况及供者的康复情况等。结果 实验狗术后均存活 ,供肾切除手术时间平均 13 2min ;肾热缺血时间平均 83s ,移植肾再灌注后排尿时间平均 74s。结论 手辅助腹腔镜活体供肾切除术易于掌握 ;手术时间短 ;供肾热缺血时间短 ,质量好 ;供肾者手术创伤小 ,术后恢复快 ;是临床值得推广应用的一种活体供肾切除方法  相似文献   
9.
本文对极易污染活螨的中药大蜜丸,在应用分离法的基础上,根据螨怕光、怕热的习性,适当调整光照,周围严格避光,达到分离活螨的目的.  相似文献   
10.
Background Adult living donor liver transplantation (LDLT) has become a routine treatment option for patients waiting for liver transplantation. In European and North American countries, LDLT for adult recipients is mainly performed with right lobe grafts. Indications, when compared to deceased donor liver transplantation, are controversial. Materials and methods In our institution, patients suffering from hepatocellular carcinoma in cirrhosis, non-resectable hilar cholangiocarcinoma, viral hepatitis associated cirrhosis, as well as cholestatic liver and biliary disease are considered good candidates for LDLT. Results In this overview, donor evaluation, graft selection, and the donor operation with special regard to operative techniques and strategies are discussed. For visualization, a 5-min video sequence of the standard donor operation as performed in our institution is attached. Conclusion Given the ongoing shortage of donor organs, adult LDLT has become a routine treatment option for patients waiting for liver transplantation. The associated inevitable risk for the healthy donor, however, remains ethically controversial. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users.  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