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   256篇
  免费   10篇
  国内免费   6篇
儿科学   8篇
妇产科学   6篇
基础医学   14篇
口腔科学   13篇
临床医学   41篇
内科学   47篇
皮肤病学   11篇
神经病学   1篇
特种医学   39篇
外科学   42篇
综合类   23篇
预防医学   9篇
眼科学   3篇
药学   9篇
肿瘤学   6篇
  2022年   1篇
  2021年   2篇
  2020年   3篇
  2018年   4篇
  2017年   3篇
  2016年   2篇
  2015年   6篇
  2014年   11篇
  2013年   14篇
  2012年   9篇
  2011年   10篇
  2010年   20篇
  2009年   15篇
  2008年   12篇
  2007年   22篇
  2006年   6篇
  2005年   3篇
  2004年   8篇
  2003年   5篇
  2002年   3篇
  2001年   3篇
  2000年   7篇
  1999年   6篇
  1998年   15篇
  1997年   8篇
  1996年   11篇
  1995年   9篇
  1994年   10篇
  1993年   3篇
  1992年   2篇
  1991年   2篇
  1990年   2篇
  1989年   1篇
  1988年   5篇
  1987年   3篇
  1986年   5篇
  1985年   3篇
  1984年   2篇
  1983年   2篇
  1982年   2篇
  1981年   2篇
  1980年   2篇
  1978年   1篇
  1977年   2篇
  1976年   2篇
  1971年   1篇
  1968年   1篇
  1928年   1篇
排序方式: 共有272条查询结果,搜索用时 0 毫秒
101.
Objective  To quantify participants' experiences of obtaining and giving information about disorders of sex development (DSD).
Design  Cross-sectional survey study that asked people about their current and past experiences relating to DSD disclosure.
Setting  A large tertiary referral centre for DSD management in the UK.
Population  One hundred of 126 people with a confirmed diagnosis of DSD who were invited to participate in the study formed the usable sample.
Methods  All people who attended clinic for follow-up during the study period and members of a patient support group whose annual meeting fell within the study period were asked to complete the Middlesex Communication Survey.
Main outcome measures  The Middlesex Communication Survey.
Results  Younger participants were more likely to report having been appropriately informed about their diagnosis than older people. Nearly half of the former had been fully informed about their diagnosis by age 15 years, compared with 0% of the older age group. In terms of information sharing, mothers were most likely to be the person with whom the participant had shared (almost/all) DSD information (74%), followed by current partners (71%). Information relating to genital surgery, presence of testes and clitoral anomalies were the least likely aspects to have been unambiguously shared with even the most informed person.
Conclusions  Our results suggest that difficulties in obtaining DSD information from care providers were common, and that communication has improved for younger participants. The study also confirmed that many people with DSD continue to struggle with confiding, even in those closest to them, about aspects of their diagnosis. Care protocol needs to centralise psychological adaptation, which should also be a primary focus for future research.  相似文献   
102.
Objective  To determine whether the presence of bowel obstruction at the time of initial presentation has any prognostic significance in these women.
Design  Retrospective cohort study.
Setting  Dedicated gynaecological oncology service of a large tertiary institution.
Population  Women who had a bowel obstruction as part of their initial presentation of ovarian cancer were identified between 1995 and 2007. Each woman was matched with four control women (with disease but no obstruction).
Methods  Women with disease were compared with controls to determine the impact, if any, of bowel obstruction at presentation. Several prognostic variables including bowel obstruction were also evaluated in a Cox proportional hazard model.
Main outcome measures  Progression-free survival (PFS) and overall survival (OS).
Results  Forty-eight women with disease and 192 controls were identified during the study period. The median follow-up period was 19 months among women with disease versus 20 months in controls. No differences were seen in demographics and clinical characteristics of the women. Optimal cytoreduction rate was similar between the two groups (75% versus 78%, P  = 0.7). Patients with bowel obstruction had a shorter PFS and OS compared with controls [19 months versus 21 months ( P  = 0.01) and 22 versus 35 months ( P  = 0.008)], respectively. Bowel obstruction at presentation was an independent prognostic variable with a hazard ratio of 1.5 ( P  = 0.009). Other prognostic variables were age, stage and extent of surgical cytoreduction.
Conclusions  Bowel obstruction at the time of initial presentation is an adverse prognostic factor in women with ovarian cancer.  相似文献   
103.
Objective  The objective of this study was to determine whether pelvic organ prolapse increases after physical activity.
Design  Prospective observational study.
Setting  St Mary's Hospital, Manchester, UK.
Sample  Women undergoing surgery for pelvic organ prolapse.
Methods  Fifty-four women were recruited to the study. Symptoms and POPQ findings were assessed after a period of prescribed activity and overnight bedrest.
Main outcome measures  Primary outcome was an increase in Pelvic Organ Prolapse Quantification (POPQ) measurements with activity. Secondary outcomes were association of symptoms or quality-of-life scores (Pelvic Floor Distress Inventory [PFDI] and Pelvic Floor Impact Questionnaire [PFIQ]) with an increase in POPQ measurements.
Results  There was a significant increase in POPQ stage and five vaginal parameters (Aa, Ba, C, Ap and Bp) with physical activity ( P < 0.001). Reported symptoms, higher PFDI and PFIQ scores and higher individual symptom bother scores were not more common in the women with greater pelvic organ descent (measured by the POPQ system) following physical activity.
Conclusions  Greater pelvic organ prolapse was found on POPQ examination following physical activity, but this was not associated with worsening of symptoms and greater impairment of quality of life.  相似文献   
104.
Emmons  RV; Reid  DM; Cohen  RL; Meng  G; Young  NS; Dunbar  CE; Shulman  NR 《Blood》1996,87(10):4068-4071
Thrombopoietin (TPO), the ligand for c-mpl, stimulates proliferation of committed megakaryocytic progenitors and induces maturation of megakaryocytes. To better understand factors regulating TPO levels, we measured blood levels of TPO in patients with impaired platelet production due to aplastic anemia (AA) and with platelet destructive disorders, including idiopathic thrombocytopenic purpura (ITP), posttransfusion purpura (PTP), drug purpura (DP), and X-linked thrombocytopenia (XLTP). The TPO receptor capture enzyme immunoassay (EIA) used had a detection limit of integral of approximately-150 to 200 pg/mL. TPO was undetectable in 88 of 89 normal individuals. Eighteen of 19 patients with AA and a mean platelet count (MPC) of 18,000/microliters (2,000 to 61,000/microliters) had markedly elevated TPO levels (mean, 1,467 pg/mL; range, 597 to 3,834 pg/mL). Eight AA patients who responded to immunosuppressive therapy with their MPC increasing to 140,000/microliters (92,000 to 175,000/microliters) had substantial decreases in TPO (mean, 440 pg/mL; range, 193 to 771 pg/mL). Initial TPO levels did not differ significantly between responders and nonresponders. In contrast, all 21 patients with ITP and an MPC of 16,000/microliters (1,000 to 51,000 /microliters) had undetectable TPO levels, as did 6 patients with acute PTP or DP and 2 patients with XLTP. Megakaryocyte mass, reflected in the rate of platelet production, appears to be the major determinant of TPO levels in thrombocytopenic patients rather than circulating platelet levels per se. Measurement of serum TPO may be useful in differentiating thrombocytopenias due to peripheral destruction from those due to thrombopoietic failure.  相似文献   
105.
SUMMARY The successful resection is reported of an abdominal aortic aneurysm after renal transplantation without the use of bypass or cooling procedure to preserve the kidney.  相似文献   
106.
107.
Parathyroid hormone‐related protein (PTHrP) is an integral mediator of physiologic and pathologic processes and has demonstrated actions in the periodontium. PTHrP functions via AP‐1, and specifically through JunB. This study identified JunB‐dependent downstream mediators of PTHrP using OCCM cementoblastic transfectants with JunB over‐ or reduced expression. Over‐expressing cells showed an increase in proliferation, while the opposite was seen in siRNA transfected cells. Microarray analysis of over‐expressing cells revealed more than 1000 regulated genes. Three genes were investigated in more detail. The PTH/PTHrP receptor (PTHR1) and ephrin B1 (EfnB1) were down‐regulated, and vascular cell adhesion molecule‐1 (VCAM‐1) was up‐regulated with JunB over‐expression. JunB siRNA transfectants had increased PTHR1, but reduced ephrin B1 and unaltered VCAM‐1 in vitro. To validate these targets, parental OCCM cells and primary osteoblasts were treated with PTHrP, resulting in reduced PTHR1 and ephrin B1, and increased VCAM‐1. Cell transfectants were implanted subcutaneously in vivo, and microarray analysis and RT‐PCR performed. Over‐expression of JunB down‐regulated PTHR1 and ephrin B1, and increased VCAM‐1. JunB siRNA transfectant implants had increased PTHR1 and ephrin B1, but no altered VCAM‐1. These data highlight new gene targets for PTHrP and indicate JunB is a critical mediator of PTHrP actions.  相似文献   
108.

Introduction

Sore throats and tonsillitis represent a considerable health burden as well as a significant source of expenditure for the National Health Service (NHS). As part of the recent NHS savings drive, the introduction of ‘procedures of low clinical effectiveness’ (PoLCE) lists has reinforced a large reduction in the number of tonsillectomies performed. We carried out a cross-sectional study of trends in emergency sore throat admissions in the context of the number of tonsillectomies performed.

Methods

Hospital Episode Statistics (HES) data were extracted. Office for National Statistics data were also used.

Results

Between 1991 and 2011, the overall tonsillectomy rate fell by 44%. In the same time, the admission rate for tonsillitis rose by 310% (Pearson’s r=–0.67, p=0.01). The peritonsillar abscess admission rate rose by 31% (r=–0.79, p<0.01). Between 1996 and 2011, the overall tonsillectomy rate fell by 41% and the retro and parapharyngeal abscess admission rate rose by 39% (r=–0.55, p=0.026). There was a 14% overall increase in tonsillectomy and sore throat associated bed days. This was despite the large fall in tonsillectomy numbers and the reduction in length of hospital stay.

Conclusions

Efforts to reduce the tonsillectomy rate are correlated with a significant rise in emergency admissions. The rise in the retro and parapharyngeal abscess rate is perhaps most alarming given the very high mortality of these conditions. Bed day data suggest that no net saving has been made despite the new measures.  相似文献   
109.
[Purpose] To present an accurate and straight-forward system of fall prediction by performing decision tree analysis using both the fall assessment sheet and Berg balance scale (BBS). [Participants and Methods] The participants in this retrospective study were inpatients from acute care units. We extracted the risk factors for falls from the fall assessment and performed a decision tree analysis using the extracted fall risk factors and BBS score. [Results] “History of more than one fall in the last 1 year”, “Muscle weakness”, “Use of a walking aid or wheelchair”, “Requires assistance for transfer”, “Use of Narcotics”, “Dangerous behavior”, and “High degree of self-reliance” were fall risk factors. The decision tree analysis extracted five fall risk factors, with an area under the curve of 0.7919. Patients with no history of falls and who did not require assistance for transfer or those with a BBS score ≥51 did not fall. [Conclusion] Decision tree-based fall prediction was useful and straightforward and revealed that patients with no history of falling and those who did not require assistance for transfer or had a BBS score ≥51 had a low risk of falling.Key words: Falling, Balance, Decision tree  相似文献   
110.
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