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   15187篇
  免费   855篇
  国内免费   448篇
耳鼻咽喉   612篇
儿科学   754篇
妇产科学   161篇
基础医学   481篇
口腔科学   206篇
临床医学   1690篇
内科学   2008篇
皮肤病学   68篇
神经病学   246篇
特种医学   986篇
外国民族医学   2篇
外科学   4300篇
综合类   2392篇
预防医学   369篇
眼科学   480篇
药学   764篇
  8篇
中国医学   564篇
肿瘤学   399篇
  2024年   23篇
  2023年   196篇
  2022年   304篇
  2021年   513篇
  2020年   527篇
  2019年   463篇
  2018年   470篇
  2017年   449篇
  2016年   522篇
  2015年   492篇
  2014年   1009篇
  2013年   906篇
  2012年   849篇
  2011年   1019篇
  2010年   850篇
  2009年   815篇
  2008年   812篇
  2007年   839篇
  2006年   753篇
  2005年   631篇
  2004年   555篇
  2003年   431篇
  2002年   401篇
  2001年   335篇
  2000年   278篇
  1999年   229篇
  1998年   201篇
  1997年   185篇
  1996年   153篇
  1995年   156篇
  1994年   111篇
  1993年   91篇
  1992年   95篇
  1991年   86篇
  1990年   81篇
  1989年   72篇
  1988年   79篇
  1987年   46篇
  1986年   51篇
  1985年   72篇
  1984年   74篇
  1983年   43篇
  1982年   48篇
  1981年   37篇
  1980年   37篇
  1979年   29篇
  1978年   21篇
  1977年   13篇
  1976年   16篇
  1973年   7篇
排序方式: 共有10000条查询结果,搜索用时 531 毫秒
991.
We reviewed nine patients with Ludwig's angina who required surgical drainage over a 24-month period. This represents the largest series reported in world literature. All of these patients were managed successfully by a combination of tracheal intubation and early surgical intervention. None required tracheostomy, which is the previously recommended procedure of choice for airway management.  相似文献   
992.
993.
994.
Patients with severe ischemia due to multilevel obstructions in the leg arteries both above and below the groin were assessed preoperatively by intraarterial brachial and femoral artery pressure measurements. The systolic pressure drop along aortoiliac obstructions was compared to the angiographic findings. A consistent pressure gradient was found in the various types of arterial occlusions. In patients with occlusion of both the aorta and the iliac arteries, the systolic pressure drop was about 60% (range, 50–78%, SD 9%). The various types of iliac artery occlusions resulted in quite uniform systolic pressure drops of about 50% (range 35–68%, SD 9%). In contrast, the systolic pressure drop along different types of iliac stenoses showed a wide variation, ranging from a minimal drop to about 60%. The degree of stenosis on the angiogram was correlated significantly with the pressure drop. Due to large variations, however, this angiographic information was found to be useless in the individual patient. No difference in the pressure drop was found between cases in which rich and poor collateral networks were visualized. Presented at the Elsinore Symposium September 1978  相似文献   
995.
996.
The objective was to assess the number of patients with acute oesophageal bolus obstruction that resolves spontaneously and to aid the identification of the best practice. This prospective and retrospective case series study at a teaching hospital and a district general hospital in Scotland, UK, involved 37 patients with acute oesophageal obstruction from a food bolus who were observed for 24 h from the beginning of symptoms. The bolus passed spontaneously in 54% of the patients during the observational period. A short observational period following the admission of patients with acute food bolus obstruction is reasonable as it may reduce exposure to surgical morbidity and decrease inpatient stay.  相似文献   
997.
The purpose of this study was to develop a method of laparoscopic biliary bypass utilizing a PTFE-covered biliary stent. An animal model of common bile duct obstruction was developed. Three days before the planned choledochojejunostomy, the common duct in 10 female pigs was ligated using mini-laparoscopy instrumentation (2 mm) to create an obstruction model. A laparoscopic choledochojejunostomy was then performed using intracorporal suturing (n=5) or stented (n=5) techniques. In the sutured group, a side-to-side two-layer anastomosis was performed. In the stented group, a Seldinger technique was used to deliver the stent into the abdomen through the small bowel and into the anterior wall of the common bile duct for deployment across both the duct and bowel to create an anastomosis (under fluoroscopic guidance). After the surgery, the animals were followed for 7 days, and then sacrificed to examine the anastomosis grossly and histologically. Statistical analysis was used to compare the two groups. Although the difference was not statistically significant, the mean anastomosis time in minutes was shorter for the stented group (37.8; range 15-74 minutes) than in the sutured group (52.8; range 28-70 minutes). All animals survived for 7 days after the procedure with no detectable biliary leaks or biliary obstruction at autopsy. These gross findings were confirmed by pathologic examination of the anastomoses. Laparoscopic choledochojejunostomy using a PTFE-covered metallic biliary stent can be performed to relieve common bile duct obstruction. In addition, the stent method was as safe and effective as sutured laparoscopic choledochojejunostomy.  相似文献   
998.
Background: Both surgical and nonsurgical options are available to treat bowel obstruction in patients with metastatic cancer. The goal is straightforward: to restore bowel patency and palliate the symptoms of obstruction. Yet the most appropriate management is often a challenging decision. Aim of the Study: We sought to review our experience in managing patients with metastatic cancer and bowel obstruction. Methods: A retrospective review was performed to identify all patients admitted at University of Wisconsin Hospital between 1993 and 2000 with the diagnoses of both bowel obstruction and metastatic cancer. Demographic data, type of management, postoperative complications, and outcome were analyzed. Results: A total of 114 patients with primarily colorectal or gynecologic malignancies were identified. Patients’ first bowel obstructions were managed in one of two ways: (1) definitive surgical intervention (n=47), or (2) conservative management (n=67). The median overall survival was 3 mo for the entire study group. There was no significant difference in overall or obstruction-free survival based on management, presence of recurrent bowel obstruction, or type of primary cancer. The only factor that was significant in predicting poor overall survival included a disease-free interval of less than 1 yr (time of diagnosis of primary cancer to time of bowel obstruction, p=0.002). Conclusions: Bowel obstruction in patients with metastatic cancer is a terminal event, with a 3-mo median survival. Because there is no difference in overall or obstruction-free survival based on management, the treatment for palliation of bowel obstruction in patients with metastatic cancer should be individualized.  相似文献   
999.
Intestinal obstruction caused by an anomalous congenital band is very rare in adults and children. A 7-year-old boy was admitted with acute intestinal obstruction. His parents mentioned that the child always had mild abdominal distention and failure to thrive from his infancy. On his medical history, there were not any attacks of abdominal pain, fever and hospitalization. Laparotomy showed an ileal loop compressed by an anomalous band, which extended from the ileum to the sigmoid mesentery resembling a mesenteric remnant. The band was resected. Histologically, it was composed of loose connective tissue containing mature vessels.  相似文献   
1000.
Three infants with anterior abdominal wall defects (gastroschisis and exomphalos) who presented with obstructive jaundice secondary to biliary obstruction, are described. All three infants had abnormal biliary systems, with mechanical distortion of the biliary tree. Biliary obstruction secondary to structural biliary anomalies should be considered in patients with abdominal wall defects and cholestasis, as prolonged unrelieved biliary obstruction may lead to biliary cirrhosis and portal hypertension.  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