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   1733篇
  免费   111篇
  国内免费   12篇
耳鼻咽喉   22篇
儿科学   70篇
妇产科学   48篇
基础医学   154篇
口腔科学   19篇
临床医学   202篇
内科学   218篇
皮肤病学   30篇
神经病学   223篇
特种医学   16篇
外科学   249篇
综合类   89篇
一般理论   1篇
预防医学   264篇
眼科学   27篇
药学   154篇
中国医学   30篇
肿瘤学   40篇
  2023年   34篇
  2022年   38篇
  2021年   84篇
  2020年   73篇
  2019年   82篇
  2018年   91篇
  2017年   64篇
  2016年   63篇
  2015年   37篇
  2014年   117篇
  2013年   131篇
  2012年   95篇
  2011年   136篇
  2010年   67篇
  2009年   77篇
  2008年   72篇
  2007年   52篇
  2006年   70篇
  2005年   42篇
  2004年   35篇
  2003年   39篇
  2002年   31篇
  2001年   28篇
  2000年   33篇
  1999年   28篇
  1998年   24篇
  1997年   22篇
  1996年   18篇
  1995年   15篇
  1994年   23篇
  1993年   15篇
  1992年   8篇
  1991年   12篇
  1990年   8篇
  1989年   3篇
  1988年   6篇
  1987年   2篇
  1985年   20篇
  1984年   14篇
  1983年   7篇
  1982年   13篇
  1981年   7篇
  1980年   7篇
  1979年   5篇
  1978年   1篇
  1977年   3篇
  1976年   1篇
  1974年   1篇
  1972年   1篇
  1971年   1篇
排序方式: 共有1856条查询结果,搜索用时 15 毫秒
1.
BackgroundChyle leak (CL) is a clinically relevant complication after pancreatectomy. Its incidence and the associated risk factors are ill defined, and various treatments options have been described. There is no consensus, however, regarding optimal management. The present study aims to systematically review the literature on CL after pancreatectomy.MethodsA systematic review from PubMed, Scopus and Embase database was performed. Studies using a clear definition for CL and published from January 2000 to January 2021 were included. The PRISMA guidelines were followed during all stages of this systematic review. The MINORS score was used to assess methodological quality.ResultsLiterature search found 361 reports, 99 of which were duplicates. The titles and abstracts of 262 articles were finally screened. The references from the remaining 181 articles were manually assessed. After the exclusions, 43 articles were thoroughly assessed. A total of 23 articles were ultimately included for this review. The number of patients varied from 54 to 3532. Incidence of post pancreatectomy CL varied from 1.3% to 22.1%. Main risk factors were the extent of the surgery and early oral or enteral feeding. CL dried up spontaneously or after conservative management within 14 days in 53% to 100% of the cases.ConclusionsThe extent of surgery is the most common predictor of risk of CL. Conservative treatment has been shown to be effective in most cases and can be considered the treatment of choice. We propose a management algorithm based on the current available evidence.  相似文献   
2.
BackgroundLymph node recurrences (LNR) from colorectal cancer (CRC) still represent a therapeutic challenge, as standardized recommendations have yet to be established. The aim of this study was to analyze short- and long-term oncological outcomes following resection of LNR from CRC.MethodsAll patients with previously resected CRC who underwent histopathologically confirmed LNR resection in 3 tertiary referral centers between 2010 and 2017 were reviewed. Short- and long-term outcomes were analyzed, mainly recurrence-free and overall survival. Further recurrences following LNR resection were also analyzed.ResultsOverall, 18 patients were included. Primary CRC was left-sided in 16 (89%) patients, staged T3-4 in 15 (83%), N+ in 14 (78%) and presented with synchronous metastases in 8 (43%). Median time interval between primary CRC and LNR resections was 31 months. Performed lymphadenectomies were aortocaval (n = 10), pelvic (n = 7), in hepatic pedicle (n = 3) and mesenteric (n = 1). Four patients had associated liver metastases resection. Three (17%) presented with postoperative complications, of which one Clavien-Dindo 3. Fourteen (78%) patients presented with further recurrences after a mean delay of 9 months, with 36% of patients presenting with early (<6 months) recurrence. Five (36%) patients could undergo secondary recurrence resection and 3 (21%) patients radiotherapy. Median overall survival following LNR resection reached 44 months.ConclusionsCurrent results suggest that LNR resection is feasible and associated with improved survival, in selected patients. Longer time interval between primary CRC resection and LNR occurrence appeared to be a favorable prognostic factor whereas multisite recurrence appeared to be associated with impaired long-term survival.  相似文献   
3.
4.
BackgroundDetails of perioperative outcomes and survival after gastric cancer surgery in prior transplant recipients have received minimal research attention.MethodsWe performed an observational cohort study using the database of 20,147 gastric cancer patients who underwent gastrectomy at a single gastric cancer center in Korea. Forty-one solid organ recipients [kidney (n = 35), liver (n = 5), or heart (n = 1)] were matched with 205 controls using propensity score matching.ResultsOperation time, blood loss, and postoperative pain were similar between groups. Short-term complication rates were similar between transplantation and control groups (22.0% vs. 20.1%, P = 0.777). Transplantation group patients with stage 1 gastric cancer experienced no recurrence, while those with stage 2/3 cancer had significantly higher recurrence risk compared to the controls (P = 0.049). For patients with stage 1 cancer, the transplantation group had a significantly higher rate of non-gastric cancer-related deaths compared to the controls (19.2% vs. 1.4%, P = 0.001). For those with stage 2/3 cancer, significantly lower proportion of the transplantation group received adjuvant chemotherapy compared to the control group (26.7% vs. 80.3%, P < 0.001). The transplantation group had a higher (albeit not statistically significant) rate of gastric cancer-related deaths compared to the controls (40.0% vs. 18.0%, P = 0.087).ConclusionTransplant recipients and non-transplant recipients exhibited similar perioperative and short-term outcomes after gastric cancer surgery. From long-term outcome analyses, we suggest active surveillance for non-gastric cancer-related deaths in patients with early gastric cancer, as well as strict oncologic care in patients with advanced cancer, as effective strategies for transplant recipients.  相似文献   
5.
IntroductionPelvic/acetabular fractures are associated with significant morbidity, mortality and cost to the society. We sought to utilize a national surgical database to assess the incidence and factors associated with prolonged length of stay (LOS), non-home discharge destination, 30-day adverse events and readmissions following surgical fixation of pelvic/acetabular fractures.Materials & methodsThe 2011–2016 ACS-NSQIP database files were queried using CPT codes (27215, 27217, 27218, 27226, 27227, 27228) for patients undergoing open reduction/internal fixation (ORIF) for pelvic/acetabular fractures. Patients undergoing additional procedures for associated fractures (vertebral fractures, distal radius/ulna fractures or femoral neck/hip fractures) were excluded from the analysis to ensure that a relevant population of patients with isolated pelvic/acetabular injuries were included in the analysis. A total of 572 patients were included in the final cohort. Severe adverse events (SAE) were defined as: death, ventilator use >48 h, unplanned intubation, stroke, deep venous thrombosis, pulmonary embolism, cardiac arrest, myocardial infarction, acute renal failure, sepsis, septic shock, re-operation, deep SSI and organ/space SSI. Minor adverse events (MAE) included – wound dehiscence, superficial SSI, urinary tract infection (UTI) and progressive renal insufficiency. An extended LOS was defined as >75th centile (>9days).ResultsFactors associated with AAE were partially dependent functional health status pre-operatively (p = 0.020), transfusion ≥1 unit of packed RBCs (p = 0.001), and ASA > II (p < 0.001). Experiencing a SAE was associated with congestive heart failure (CHF) pre-operatively [p = 0.005), total operative time >140 min (p = 0.034) and Hct <36 pre-operatively (p = 0.003). MAE was associated with transfusion≥1 unit of packed RBCs (p = 0.022) and ASA > II (p = 0.007). Patients with an ASA > II (p = 0.001), total operative time>140 min (p < 0.001) and Hct <36 (p = 0.006) were more likely to have a LOS >9 days. Male gender (p = 0.026), prior history of CHF (p = 0.024), LOS >9 days (p = 0.030) and >10% bodyweight loss in last 6 months before the procedure (p = 0.002) were predictors of 30-day mortality.ConclusionPatients with ASA grade > II, greater co-morbidity burden and prolonged operative times were likely to experience adverse events and have a longer length of stay. Surgeons can utilize this data to risk stratify patients so that appropriate pre-operative and post-operative medical optimization can take place.  相似文献   
6.
7.
8.
9.
10.
The paper aims at understanding the processes related to young children's belonging during daily arrivals at day and night care. Two aspects of a child's belonging are considered: membership and sense of belonging. Data were gathered by ethnographic observation of 8 children aged from 20 to 36 months in two Finnish day care centres offering day and night care. Arrival episodes taking place at different times of day were analysed qualitatively based on the children's actions and expressions. During these episodes, the children negotiated and constructed their belonging by interacting with adults, peers and material objects. These interactions took place within varying social and material surroundings and according to different daily routines that sometimes challenged the child's belonging. The results underline the importance of sensitive responsiveness by educators to young children's initiatives in supporting children's belonging during daily arrivals at day and night care.  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