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   10289篇
  免费   681篇
  国内免费   228篇
儿科学   66篇
妇产科学   296篇
基础医学   241篇
临床医学   1870篇
内科学   920篇
皮肤病学   10篇
神经病学   19篇
特种医学   154篇
外国民族医学   2篇
外科学   4470篇
综合类   1711篇
现状与发展   1篇
预防医学   383篇
眼科学   1篇
药学   606篇
  37篇
中国医学   97篇
肿瘤学   314篇
  2024年   23篇
  2023年   198篇
  2022年   349篇
  2021年   432篇
  2020年   483篇
  2019年   325篇
  2018年   308篇
  2017年   351篇
  2016年   462篇
  2015年   392篇
  2014年   795篇
  2013年   754篇
  2012年   669篇
  2011年   794篇
  2010年   644篇
  2009年   577篇
  2008年   453篇
  2007年   507篇
  2006年   434篇
  2005年   437篇
  2004年   319篇
  2003年   240篇
  2002年   207篇
  2001年   155篇
  2000年   126篇
  1999年   105篇
  1998年   84篇
  1997年   92篇
  1996年   110篇
  1995年   116篇
  1994年   107篇
  1993年   57篇
  1992年   34篇
  1991年   24篇
  1990年   9篇
  1989年   3篇
  1988年   4篇
  1987年   2篇
  1986年   7篇
  1985年   1篇
  1984年   2篇
  1982年   3篇
  1981年   2篇
  1979年   1篇
  1975年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
目的探讨如何控制腹腔镜胆囊切除术(LC)开展初期的并发症及中转率。方法制定八条质量控制措施,总结分析568例LC临床资料。结果并发症6例,仅占1.2%,中转手术8例,中转率仅1.6%。结论在开展LC初期只要加强质量控制,完全可以避开高并发症、高中转率这种所谓的自然规律。  相似文献   
32.
We performed laparoscopic appendectomy and drainage to treat panperitonitis due to perforated appendicitis that occurred in a 28‐year‐old woman. We believe this is an appropriate procedure to treat perforated appendicitis because it is safe and minimally invasive, and faster recovery can be expected than after conventional open appendectomy.  相似文献   
33.
Because of reduced health care funding it is becoming necessary for surgeons to take a greater interest in the costs of individual operations. This study reports costs directly measurable to the patient, and also the indirect costs of hospital overheads, an operating suite and teaching, which were 37, 10 and 15%, respectively (62%), of hospital budget. A scheme has been developed which could give surgeons a standard to report direct costs. Pre-admission, ward, operating room, recovery, intensive care and post-admission are defined as cost periods and the modalities of staff, equipment (capital, maintenance and replacement), imaging, laboratory and consumables apply to each. This strategy was applied to assess open cholecystectomy (OC) and laparoscopic cholecystectomy (LC) as an example. The direct costs for OC were $3706 and LC $2868, a difference of $838; the indirect and direct costs were OC $6004 and LC $4646, a difference of $1358. Thus indirect cost magnified the difference between the operations. Bed stay, density of nursing and use of disposable instruments were the major influences on direct costs. The individual cost advantage of a shorter bed stay may be countervailed by an increased hospital activity. The main patient benefit of new operations may be improved quality of life and more rapid return to work with prevention of salary losses. A method has been developed to define costs of a particular surgical operation with the purpose of stimulating surgeons' interest in this topic and developing a common style of reporting. This method should help clinicians dealing with hospital finances and waiting lists. Indirect costs are a hidden substantial cost of surgery. Considerably more attention needs to be paid to indirect costs in controlling surgical budgets.  相似文献   
34.
Background: The practice of laparoscopic cholecystectomy in a community hospital is presented. The morbidity of the procedure is analysed and recommendations for improvement are made. Laparoscopic cholecystectomy was introduced into this 200 bed community hospital in October 1990. All five general surgeons accredited to the hospital agreed to participate in a quality assurance programme to determine the incidence of complications and to make recommendations for improvement. Methods: The records of all 534 patients having laparoscopic cholecystectomy between October 1990 and September 1993 were reviewed, and all complications recorded. Results: Of the 534 cases reviewed in the study 470 were considered uncomplicated and 64 patients experienced a total of 85 postoperative complications. The death of one patient was caused by a pulmonary embolus and another patient experienced a myocardial infarction. Twenty patients has postoperative atelectasis or pneumonia and urinary infection or retention occurred in seven. Complications of laparoscopic cholecystectomy requiring a conversion to open cholecystectomy occurred in eight patients, biliary complications occurred in 18 and 11 patients required re-operation. Conclusions: Three areas of concern were identified. They were the incidence of major biliary injury (0.37% of all cases) and its management, the role of cholangiography. and the incidence and prophylaxis of deep venous thrombosis and pulmonary embolism. Recommendations for improvement in these areas were made.  相似文献   
35.
The current methods utilized for laparoscopic cholangiography involve cystic duct cannulation and present practical difficulties and potential hazards. An alternative method for intraoperative cholangiography is described which is easy, quick, and safe. The Kumar clamp (a gift from Sabi Kumar, M.D.) is placed across the infundibulum. A 23-gauge sclerotherapy needle is introduced through a side port in the clamp and directed into the infundibulum. The cholangiogram is obtained prior to any dissection in the triangle of Calot, thereby avoiding iatrogenic common bile duct injuries due to misidentification of the cystic duct or anomalous anatomy. To date no pathology has been missed and no complications have resulted from this technique.  相似文献   
36.
Laparoscopic cholecystectomy is associated with a two-to-four times higher risk of bile duct injury (BDI) than open cholecystectomy. BDI can lead to significant morbidity and even mortality. The first priority in BDI is to control peritoneal and biliary sepsis and to convert an acute BDI to a controlled external biliary fistula (EBF) — this can be achieved by endoscopic and/ or radiological intervention in most cases. This should be followed by assessment of the extent of injury — both biliary and vascular. Immediate management of BDI recognized during cholecystectomy depends on the type of injury, the condition of the patient, and the experience of the surgeon. For BDI recognized after cholecystectomy, early repair is not recommended, as the results are poor. The EBF may evolve into a benign biliary stricture (BBS), which should be electively repaired by a Roux-en-Y hepatico-jejunostomy. The use of an endoscopic stent as definitive management of BDI is not recommended. Long-term follow-up is essential after the repair of a BBS, as recurrence can occur several years after repair. Recurrent BBS is best treated with endoscopic balloon dilatation. Excellent early and long-term results can be obtained in specialized units at tertiary care referral centers.  相似文献   
37.
The traditional method of establishing a pneumoperitoneum before laparoscopic surgery is via a Verres needle inserted in the midline below the umbilicus while tenting the abdominal wall with the hand. A new approach is described in which preliminary surgical exposure and tenting of the linea alba immediately above the umbilicus is achieved before needle insertion through the superior margin of the umbilical ring. The advantages of this new technique over the conventional method are discussed. Further technical features important in the safe formation of the pneumoperitoneum are emphasized.  相似文献   
38.
Intraperitoneal bupivacaine for analgesia after laparoscopic cholecystectomy   总被引:10,自引:0,他引:10  
Background The effects of intraperitoneal administration of bupivacaine on pain after laparoscopic cholecystectomy were studied in a prospective, double-blind, randomised trial. Methods: Eighty ASA 1 and 2 patients were randomly assigned to one of two groups. Immediately after pneumoperi-toneum was obtained patients in group 1 were given 15 ml of 0.5% bupivacaine injected under direct vision into the hepato-diaphragmatic space, near and above the hepato-duodenal ligament and above the gallbladder. At the end of operation another 15 ml of bupivacaine was injected. Patients in group 2 were given 15 ml of 0.9% saline solution in a similar fashion. Postoperative pain was assessed using a visual analogue scale (VAS 100 mm) at 0.5,4, 8,12 and 24 h after surgery. Analgesic consumption was also recorded.  相似文献   
39.
Objective To obtain a general overview of gallstone disease in Shanghai. Methods 3415citizens aged >20 in the community of Shanghai were randomly selected to undergo a clinical epidemiological study and an ultrasound examination to screen for cholelithiasis. Results Overall prevalence rate of gallstones was 6.5% (8.6% in women and 5.1% in men). Among the 3415 persons investigated, 65 had already undergone cholecystectomy. The percentage of asymptomatic gallstone was 70 .5% . Prevalence of gallstone diseases (gallstones plus cholecystectomy) increased with age significantly. Conclusion Compared to the research in Shanghai ten years ago, especially for the persons older than 50 years, the gallstone disease has become more frequent. The proportion of asymptomatic gallstones and the awareness is increasing.  相似文献   
40.
目的 探讨超声刀在腹腔镜胆囊切除术中的应用价值。方法 将 86例腹腔镜胆囊切除术患者随机分为超声刀组 ( 3 4例 )与电刀组( 5 2例 ) ,分别使用超声刀与单极电刀完成手术 ,比较术中及术后的效果。结果  86例手术顺利完成 ,无中转开腹。手术时间分别为 ( 4 5±7)min和 ( 62± 9)min(P <0 0 1) ,术中出血量分别为 ( 5± 0 .8)ml和 ( 2 0± 5 )ml(P <0 .0 1) ,术后肠道功能恢复时间分别为 ( 2 0± 4)h和 ( 2 4±6)h(P <0 0 1) ,两组均无胆瘘发生。结论 超声刀在腹腔镜胆囊切除术中较电刀更快捷 ,出血更少 ,术后恢复更快  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