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   4207篇
  免费   229篇
  国内免费   9篇
耳鼻咽喉   49篇
儿科学   152篇
妇产科学   34篇
基础医学   547篇
口腔科学   111篇
临床医学   311篇
内科学   874篇
皮肤病学   57篇
神经病学   514篇
特种医学   153篇
外科学   629篇
综合类   94篇
预防医学   211篇
眼科学   74篇
药学   323篇
中国医学   6篇
肿瘤学   306篇
  2023年   38篇
  2022年   61篇
  2021年   100篇
  2020年   52篇
  2019年   88篇
  2018年   118篇
  2017年   84篇
  2016年   87篇
  2015年   106篇
  2014年   155篇
  2013年   206篇
  2012年   285篇
  2011年   305篇
  2010年   149篇
  2009年   156篇
  2008年   218篇
  2007年   234篇
  2006年   252篇
  2005年   208篇
  2004年   189篇
  2003年   188篇
  2002年   148篇
  2001年   113篇
  2000年   97篇
  1999年   87篇
  1998年   51篇
  1997年   52篇
  1996年   41篇
  1995年   27篇
  1994年   31篇
  1993年   37篇
  1992年   57篇
  1991年   56篇
  1990年   35篇
  1989年   32篇
  1988年   30篇
  1987年   40篇
  1986年   30篇
  1985年   28篇
  1984年   24篇
  1983年   20篇
  1982年   10篇
  1981年   10篇
  1980年   10篇
  1979年   7篇
  1978年   10篇
  1975年   10篇
  1973年   5篇
  1972年   5篇
  1967年   6篇
排序方式: 共有4445条查询结果,搜索用时 15 毫秒
41.
We report a case of disseminated meningospondylodiscitis in an elderly diabetic patient caused by Fusarium oxysporum. As the clinical presentation was nonspecific, the diagnosis of the condition could only be arrived at after laboratory and imaging studies. The diagnosis of the condition requires a high index of suspicion. Patient underwent thorough surgical debridement along with a short course of variconazole and remained asymptomatic after 36 months of diagnosis. Fusarium is a large genus of filamentous fungi widely distributed in soil and in association with plants. It is known to cause local infections (nail, cornea) in healthy humans and disseminated infection only in the immunocompromised.  相似文献   
42.
43.
44.
Background Beating heart surgery has now become the commonest technique of doing Coronary Artery Bypass Graft Surgery (CABG) in our country. It is being used even in such high risk situations like diffuse coronary disease and Critical Left Main stem Stenosis (LMCS) with good results. The aim of this study is to retrospectively review our results in Off-Pump Coronary Artery Bypass Surgery (OPCAB) in patients with critical left main stem stenosis. Methods This study is a retrospective analysis of the data of patients who underwent primary coronary artery bypass surgery. During the period from April 2003 to September 2005 a total of 64 patients underwent OPCAB procedure for critical LMCS. During the same period 10 patients underwent CABG on Cardio Pulmonary Bypass (CPB). The age range was 36–77yrs. The sex distribution was M: F 53∶10. Ten patients were done as emergency. 2 of them were on Intra Aortic Balloon Pump (IABP) support preoperatively. 10 patients were high risk with a Euro score of ≥5. Results Left Internal Mammary Artery (LIMA) was used in 78% of cases. Average grafts per patient was 2.96. The median ventilation time was 5.91 hrs. New IABP insertion in postoperative period was required in 1 patient. One patient was reexplored for bleeding. There was one perioperative myocardial infarction. 57% of patients did not need any blood transfusion. There was no conversion to CPB. There was no operative mortality. Inotropes were used in ten cases. Conclusions OPCAB is a safe method of revascularization in patients with critical LMCS. Preoperative IABP is useful in patients with cardiogenic shock. However, there is a place for CPB in patients needing additional procedures like Mitral Valve repair (MV repair) or Dor's procedure or when the vessels are very diffusely diseased. Those patients who are unstable despite IABP support may be managed by Beating heart On Pump (BHOP) technique.  相似文献   
45.
Inguinal hernia surgery is one of the most common electively performed surgeries in infants. The common nature of inguinal hernia combined with the high-risk population involving a predominance of preterm infants makes this a particular area of interest for those concerned with their perioperative care. Despite a large volume of literature in the area of infant inguinal hernia surgery, there remains much debate amongst anesthetists, surgeons and neonatologists regarding the optimal perioperative management of these patients. The questions asked by clinicians include; when should the surgery occur, how should the surgery be performed (open or laparoscopic), how should the anesthesia be conducted, including regional versus general anesthesia and airway devices used, and what impact does anesthesia choice have on the developing brain? There is a paucity of evidence in the literature on the concerns, priorities or goals of the parents or caregivers but clearly their opinions do and should matter. In this article we review the current clinical surgical and anesthesia practice and evidence for infants undergoing inguinal hernia surgery to help clinicians answer these questions.  相似文献   
46.
Advancement Flaps: A Basic Theme with Many Variations   总被引:1,自引:0,他引:1  
Krishnan Ravi  MD    Garman Mary  MD    Nunez-Gussman Janna  MD    Orengo Ida  MD 《Dermatologic surgery》2005,31(S2):986-994
Background. The advancement flap involves the linear advancement of tissue in one direction. Despite its straightforwardness and simple concept, it can be used to close a variety of defects, ranging from small defects on the scalp or extremities to large, complicated defects involving cosmetic units on the face.
Objectives. To provide a basic and useful review for the indications, advantages, disadvantages, and techniques for the use of advancement flaps in the reconstruction of defects in dermatologic surgery.
Materials and Methods. We performed a literature search for articles discussing advancement flaps and compiled a brief review of our findings.
Results. The movement of the advancement flap must be balanced by the blood supply of the flap. The excision of Burow's triangles along various aspects of the advancement flap can increase movement and improve cosmesis of the flap. The types of advancement flaps discussed include the single advancement flap, double advancement flap, A-T flap (O-T flap), Burow's triangle flap (Burow's wedge flap), crescenteric advancement flap, island pedicle flap (V-Y flap), helical rim advancement flap, and facelift flap.
Conclusion. Advancement flaps are versatile and useful basic flaps for repairing defects.  相似文献   
47.
The purpose of this study was to determine the outcome of surgery for patients with recurrent gastric or gastroesophageal cancer. We queried records from 7,459 patients who presented with gastric or gastroesophageal cancer to our institution from 1973 through 2005 to identify those for whom resection of recurrent disease had been attempted. We assessed the associations between various clinicopathologic factors and resectability with logistic regression analysis and between clinicopathologic factors and overall survival (OS) with the Cox proportional hazards model. Sixty patients underwent attempted resection for recurrent cancer. In 31 cases (52%), recurrent disease proved unresectable at laparotomy. Factors associated with the ability to undergo re-resection included neoadjuvant treatment prior to initial resection [odds ratio (OR) 12.2, 95% confidence interval (CI) 1.9–75.6] and having an isolated local recurrence (OR 5.1, 95% CI 1.3–20.5). Of the 29 patients who underwent re-resection, 14 required adjacent organ resection, and 6 required interposition grafting. Three- and 5-year OS rates for all 60 patients were 21% and 12%, respectively; median follow-up time was 23 months. Median OS for patients undergoing resection was 25.8 months (95% CI 17.1–49.8) versus 6.0 months (95% CI 4.0–10.5) for unresectable patients (P < 0.001). Initial tumor location at the gastroesophageal junction was associated with diminished OS [hazard ratio (HR) 2.8, 95% CI 1.2–6.5] and ability to undergo resection of recurrence was associated with improved OS (HR 0.2, 95% CI 0.1–0.6). We conclude that surgical resection of select patients with recurrent gastric or gastroesophageal cancer can result in improved OS but often requires adjacent organ resection or interposition graft placement.  相似文献   
48.
Organ transplantation remains the only life-saving therapy for many patients with organ failure. Despite the work of the Organ Donation and Transplant Collaboratives, and the marked increases in deceased donors early in the effort, deceased donors only rose by 67 from 2006 and the number of living donors declined during the same time period. There continues to be increases in the use of organs from donors after cardiac death (DCD) and expanded criteria donors (ECD). This year has seen a major change in the way organs are offered with increased patient safety measures in those organ offers made by OPOs using DonorNet©. Unfortunately, the goals of 75% conversion rates, 3.75 organs transplanted per donor, 10% of all donors from DCD sources and 20% growth of transplant center volume have yet to be reached across all donation service areas (DSAs) and transplant centers; however, there are DSAs that have not only met, but exceeded, these goals. Changes in organ preservation techniques took place this year, partly due to expanding organ acceptance criteria and increasing numbers of ECDs and DCDs. Finally, the national transplant environment has changed in response to increased regulatory oversight and new requirements for donation and transplant provider organizations.  相似文献   
49.
Sclerosing encapsulating peritonitis, or “abdominal cocoon,” is a rare but serious complication of continuous ambulatory peritoneal dialysis. It is characterized by the diffuse appearance of marked sclerotic thickening of the peritoneal membrane resulting in intestinal obstruction.A 14-year-old adolescent boy with a history of end-stage renal failure on continuous ambulatory peritoneal dialysis presented with symptoms of acute intestinal obstruction. A computed tomography scan of the abdomen revealed distended small bowel loops clustered and displaced to the right upper quadrant. The overlying peritoneum was markedly thickened and calcified. Laparotomy confirmed the diagnosis of sclerosing encapsulating peritonitis and the patient was treated with excision of the fibrocollagenous membrane. Postoperatively, he had prolonged ileus requiring parenteral nutritional support and peritoneal dialysis was restarted on postoperative day 10.A high degree of cognizance is needed to facilitate diagnosis and treatment of this uncommon and potentially life-threatening condition.  相似文献   
50.
The diagnosis and management of childhood tuberculosis (TB) are major challenges in countries such as Malawi with high incidence of TB and human immunodeficiency virus (HIV) infection. Diagnosis of TB in children often relies only on clinical features but clinical overlap with the presentation of HIV and other HIV-related lung disease is common. The tuberculin skin test (TST), the standard marker of M. tuberculosis infection in immune competent children, has poor sensitivity in HIV-infected children and is not usually available in Malawi. HIV test should be routine in children with suspected TB as it improves clinical management. HIV-infected children are at increased risk of developing active disease following TB exposure which justifies the use of isoniazid preventive therapy (IPT) once active disease has been excluded but this is difficult to implement and appropriate duration of IPT is unknown. HIV-infected children with active TB experience higher mortality and relapse rates on standard TB treatment compared to HIV-uninfected children, highlighting the need for further research to define optimal treatment regimens. HIV-infected children should also receive appropriate supportive care including cotrimoxazole prophylaxis and anti-retroviral treatment (ART) if indicated. There are concerns about concurrent use of some anti-TB drugs such as rifampicin with some ARTs.  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