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   48096篇
  免费   2322篇
  国内免费   600篇
耳鼻咽喉   134篇
儿科学   807篇
妇产科学   255篇
基础医学   2411篇
口腔科学   167篇
临床医学   2717篇
内科学   7589篇
皮肤病学   134篇
神经病学   496篇
特种医学   1389篇
外国民族医学   23篇
外科学   23238篇
综合类   2822篇
现状与发展   2篇
预防医学   610篇
眼科学   66篇
药学   1030篇
  23篇
中国医学   63篇
肿瘤学   7042篇
  2023年   1654篇
  2022年   2626篇
  2021年   3154篇
  2020年   2614篇
  2019年   1717篇
  2018年   1501篇
  2017年   1304篇
  2016年   1244篇
  2015年   1516篇
  2014年   3234篇
  2013年   2717篇
  2012年   2559篇
  2011年   2636篇
  2010年   2320篇
  2009年   2191篇
  2008年   1817篇
  2007年   1899篇
  2006年   1759篇
  2005年   1520篇
  2004年   1298篇
  2003年   1190篇
  2002年   1122篇
  2001年   1005篇
  2000年   893篇
  1999年   879篇
  1998年   436篇
  1997年   289篇
  1996年   255篇
  1995年   212篇
  1994年   185篇
  1993年   166篇
  1992年   421篇
  1991年   430篇
  1990年   437篇
  1989年   330篇
  1988年   269篇
  1987年   156篇
  1986年   69篇
  1985年   93篇
  1984年   74篇
  1982年   64篇
  1981年   52篇
  1980年   56篇
  1979年   48篇
  1978年   72篇
  1977年   48篇
  1976年   62篇
  1975年   44篇
  1973年   70篇
  1972年   41篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
Background/PurposeA small number of Hirschsprung disease (HD) patients develop inflammatory bowel disease (IBD)-like symptoms after pullthrough surgery. The etiology and pathophysiology of Hirschsprung-associated IBD (HD-IBD) remains unknown. This study aims to further characterize HD-IBD, to identify potential risk factors and to evaluate response to treatment in a large group of patients.MethodsRetrospective study of patients diagnosed with IBD after pullthrough surgery between 2000 and 2021 at 17 institutions. Data regarding clinical presentation and course of HD and IBD were reviewed. Effectiveness of medical therapy for IBD was recorded using a Likert scale.ResultsThere were 55 patients (78% male). 50% (n = 28) had long segment disease. Hirschsprung-associated enterocolitis (HAEC) was reported in 68% (n = 36). Ten patients (18%) had Trisomy 21. IBD was diagnosed after age 5 in 63% (n = 34). IBD presentation consisted of colonic or small bowel inflammation resembling IBD in 69% (n = 38), unexplained or persistent fistula in 18% (n = 10) and unexplained HAEC >5 years old or unresponsive to standard treatment in 13% (n = 7). Biological agents were the most effective (80%) medications. A third of patients required a surgical procedure for IBD.ConclusionMore than half of the patients were diagnosed with HD-IBD after 5 years old. Long segment disease, HAEC after pull through operation and trisomy 21 may represent risk factors for this condition. Investigation for possible IBD should be considered in children with unexplained fistulae, HAEC beyond the age of 5 or unresponsive to standard therapy, and symptoms suggestive of IBD. Biological agents were the most effective medical treatment.Level of EvidenceLevel 4  相似文献   
32.
33.
《Pancreatology》2022,22(8):1175-1180
BackgroundHepatic steatosis has been described as a common finding in adults following total pancreatectomy with islet autotransplantation (TPIAT) but it is unknown if this occurs in children and adolescents.ObjectivesTo define the frequency of post-TPIAT hepatic steatosis in a sample of children and adolescents and to identify clinical predictors of incident steatosis post-TPIAT.MethodsIn this prospective study, consecutive participants at least 1-month post-TPIAT underwent a liver MRI with proton density fat fraction (PDFF) and blood draw at our pediatric academic medical center between April 2021 and January 2022. Comparison clinical pre-TPIAT liver MRI or ultrasound and insulin use and graft function data were extracted from the medical record. T-tests were used for the comparison of means across continuous variables between participants with and without post-TPIAT steatosis.ResultsA total of 20 participants (mean: 13 ± 4 years; 12 female) were evaluated. Mean liver PDFF at research MRI was 7.4 ± 6.2% (range: 2–25%). Seven participants (35%) had categorical hepatic steatosis (PDFF>5%) post-TPIAT, five of whom had pre-TPIAT steatosis, reflecting a 13% (2/15; 95% CI: 2–40%) incidence of post-TPIAT steatosis. Participant characteristics were not significantly different between subgroups with and without post-TPIAT steatosis. Mean PDFF at research MRI was not different between graft function subgroups (7.5% optimal/good vs. 7.3% marginal/failure; p = .96).ConclusionOur study shows a moderate prevalence but low incidence of hepatic steatosis in a small sample of children and adolescents post-TPIAT. This study raises questions about a causal relationship between TPIAT and hepatic steatosis.  相似文献   
34.
35.
ObjectiveThe purpose of this review is to describe the myriad complications of cancer and its therapies to emphasize the pathophysiological need for prehabilitation.Data SourcesThe information presented in this review is from applicable, peer-reviewed scientific articles.ConclusionCancer itself renders negative effects on the body, most notably unintentional weight loss and fatigue. Cancer treatments, especially surgical interventions, can cause detrimental short- and long-term impacts on patients, which translate to suboptimal treatment outcomes. Prehabilitation can be used to improve patient health prior to anticancer therapies to improve treatment tolerance and efficacy.Implications for Nursing PracticeNurses play an important role in the treatment of patients with cancer throughout the cancer care continuum. Many nurses are already aiding their patients in cancer prehabilitation through education. By describing common impairments amenable to multimodal prehabilitation, nurses may better advocate for their patients and can become even more involved in this aspect of care.  相似文献   
36.
37.
Study ObjectiveTo evaluate the diagnostic accuracy of transvaginal ultrasound in predicting a laparoscopic, surgically assigned, revised American Society of Reproductive Medicine (ASRM) endometriosis stage.DesignA multicenter, retrospective, diagnostic accuracy study.SettingThe patients visited 1 of 2 academic gynecologic ultrasound units and underwent laparoscopy led by 1 of 6 surgeons in metropolitan Sydney, Australia, between 2016 and 2018.PatientsPatients with suspected endometriosis (n = 204).InterventionsUltrasound followed by laparoscopy.Measurements and Main ResultsSurgical cases were identified. The preoperative ultrasound report and surgical operative notes were each used to retrospectively assign an ASRM score and stage. The breakdown of surgical findings was as follows: ASRM 0 (i.e., no endometriosis), 24/204 (11.8%); ASRM 1, 110/204 (53.9%); ASRM 2, 22/204 (10.8%); ASRM 3, 16/204 (7.8%); ASRM 4, 32 204 (15.7%). The overall accuracy of ultrasound in predicting the surgical ASRM stage was as follows: ASRM 1, 53.4%; ASRM 2, 93.8%; ASRM 3, 89.7%; ASRM 4, 93.1%; grouped ASRM 0, 1, and 2, 94.6%; and grouped ASRM 3 and 4 of 94.6%. Ultrasound had better test performance in higher disease stages. When the ASRM stages were dichotomized, ultrasound had sensitivity and specificity of 94.9% and 93.8%, respectively, for ASRM 0, 1, and 2 and of 93.8% and 94.9%, respectively, for ASRM 3 and 4.ConclusionUltrasound has high accuracy in predicting the mild, moderate, and severe ASRM stages of endometriosis and can accurately differentiate between stages when ASRM stages are dichotomized (nil/minimal/mild vs moderate/severe). This can have major positive implications on patient triaging at centers of excellence in minimally invasive gynecology for advanced-stage endometriosis.  相似文献   
38.
39.
40.
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