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   612篇
  免费   23篇
  国内免费   2篇
儿科学   3篇
妇产科学   17篇
基础医学   78篇
口腔科学   15篇
临床医学   80篇
内科学   36篇
皮肤病学   4篇
神经病学   28篇
特种医学   25篇
外科学   76篇
综合类   4篇
预防医学   81篇
药学   41篇
肿瘤学   149篇
  2024年   1篇
  2023年   2篇
  2022年   3篇
  2021年   9篇
  2020年   6篇
  2019年   3篇
  2018年   5篇
  2017年   8篇
  2016年   9篇
  2015年   4篇
  2014年   19篇
  2013年   18篇
  2012年   49篇
  2011年   50篇
  2010年   29篇
  2009年   29篇
  2008年   38篇
  2007年   46篇
  2006年   32篇
  2005年   45篇
  2004年   29篇
  2003年   21篇
  2002年   22篇
  2001年   13篇
  2000年   10篇
  1999年   8篇
  1998年   10篇
  1997年   8篇
  1996年   10篇
  1995年   10篇
  1994年   5篇
  1993年   9篇
  1992年   16篇
  1991年   5篇
  1990年   8篇
  1989年   4篇
  1988年   7篇
  1987年   7篇
  1986年   9篇
  1985年   7篇
  1984年   3篇
  1983年   1篇
  1982年   3篇
  1981年   1篇
  1980年   1篇
  1979年   2篇
  1978年   1篇
  1977年   1篇
  1948年   1篇
排序方式: 共有637条查询结果,搜索用时 15 毫秒
1.
Knee arthroscopy and arthrotomy under local anesthesia   总被引:1,自引:0,他引:1  
We report our experience with knee arthroscopy in local anesthesia in 64 patients with subsequent arthrotomy in 14 of these. The effectiveness of the anesthetic method was evaluated by both the patient and the anesthetic personnel. There was no difference in pain assessment between arthroscopy alone and arthroscopy followed by arthrotomy. Half of the patients had no pain and only one regarded the procedure as very painful. Supplementary analgesia with 0.05 mg fentanyl was given to half of the patients not undergoing arthrotomy and to two thirds of those who had arthrotomy. It was not necessary to abandon any arthroscopic or surgical procedure because of pain. We conclude that local anesthesia is a safe and practical method for diagnostic arthroscopy, arthroscopic surgery, and minor arthrotomy.  相似文献   
2.
The two most widely used synthetic progestins in breast cancer treatment, medroxyprogesterone acetate (MPA) and megestrol acetate (MA), are reviewed with regard to pharmacological, endocrinological and clinical aspects. In high oral doses as second- or first-line endocrine therapy in advanced breast cancer, they give a similar response rate as tamoxifen (TAM) and aminoglutethimide (AG). The mechanism of action is probably complex. Considerable changes in serum levels of different hormones are induced by progestin treatment. The decrease of serum estrone sulfate (E1S) may be part of the therapeutic mechanism. Some studies suggest that the two drugs, MPA and MA, have a different mode of action, and possibly a low cross resistance. Randomized studies using the two progestins with a cross-over design may answer these questions. Further studies on the influence of progestin on different receptors and growth factors are warranted. To determine the most effective clinical dose of the two progestins, studies with increasing therapeutic doses are needed.  相似文献   
3.
BACKGROUND: Several reports have been published showing that women with urinary incontinence (UI) can be taken care of and treated satisfactorily in general practice. AIM: To find out whether the treatment of women with UI in general practice is effective also in the long term. METHOD: One hundred and five women with UI who consulted their general practitioner (GP) were examined and treated according to a treatment protocol. Treatment options were pelvic floor exercises, electrical stimulation, oestrogen supplements, bladder training, and protective pads. Three to six years after inclusion, all women received a postal questionnaire to evaluate the long-term effectiveness of treatment. Women who had been referred to a specialist were excluded. RESULTS: Eighty out of 82 eligible patients answered the questionnaire after a mean follow-up period of 56 months. Twenty-seven per cent were continent, 26% much better, 23% a little better, 21% unchanged, and 3% were worse compared with before the treatment. The median score on a 100 mm visual analogue scale was 16 compared with 31 before treatment, and the percentage of women that were 'much' or 'a great deal' bothered by UI was reduced from 35% to 12%. The percentage of women with severe UI was reduced from 59% to 30%, and the number of women using pads was reduced from 62% to 39%. CONCLUSION: This study confirms that management of female UI in general practice is effective also in the long term.  相似文献   
4.
A urine specimen is traditionally sampled using the clean-catch midstream technique, but this technique is poorly documented. The aim of this study was to evaluate the bacterial content of urine samples taken using individual steps of the clean-catch midstream technique, or combinations of steps. One hundred and ten women students provided a total of 864 early morning urine samples, using a different sampling technique each morning. Holding the labia apart during sampling more than halved the percentage of samples containing 10(5) colony-forming units per ml or more, and increased the percentage of uncontaminated samples, compared with passing urine without employing any of the precautions. Cleaning the perineum or using the midstream technique resulted in percentages no different from urination without employing any precautions. It is therefore recommended that women should be instructed to carry out the simplest effective urine sampling technique: holding the labia apart.  相似文献   
5.

Objectives

International literature suggests that arts and culture activities may benefit mental health, however, such survey studies conducted in the Danish population are scarce. Further, studies have investigated the associated risk for incident depression, but not for persistent depression. The objective of the current prospective study was to assess associations of engagement in arts and culture activities with incident/persistent depression and also mental wellbeing among Danish adults in the general population.

Design

Observational prospective study.

Methods

Data stem from a Danish nationally representative panel study of 5000 adults (aged 15+ years) conducted in 2019 and 2020, which was linked to Danish register data. An exposure variable was constructed for frequency of attending concerts, theatres, museums, and cinemas. Validated scales were used to assess the presence of depression (PHQ-8) and levels of mental wellbeing (SWEMWBS). Binary logistic regression analyses were conducted to assess the risk of incident depression (among participants free of depression at baseline), as well as the risk of persistent depression (among participants with depression at baseline), while multinomial logistic regression was used to assess odds for moderate and high mental wellbeing (low as base outcome) while adjusting for baseline values.

Result

In terms of incident depression, quarterly engagement in arts and culture activities (compared to never) was associated with an OR of .43 (95%CI .23–.80), while 8 times or more was associated with an OR of .53 (.29–.97). In terms of persistent depression, quarterly engagement was associated with an OR of .30 (.10–.90), while 8 times per year or more was associated with an OR of .26 (.07–.92). Similar to the patterns for incident/persistent depression, associations with moderate mental wellbeing showed higher odds for quarterly engagement and 8 times per year or more. Quarterly engagement was also associated with higher odds for high mental wellbeing but did not reach statistical significance.

Conclusions

The results support the involvement of the cultural and creative sectors in health strategies. Mental health promotion initiatives as well as arts and culture sectors may encourage the general public to engage in arts and culture activities with frequencies of at least once per quarter.  相似文献   
6.
The antitumor activity of zeniplatin, a third-generation, water-soluble platinum compound that has shown broad preclinical antitumor activity and no significant nephrotoxicity in phase I trials, was tested in patients with advanced malignant melanoma and advanced renal cancer. Patients who had not previously been treated, except with local limb perfusion and immunotherapy, were given zeniplatin as bolus injections at 125 mg/m2 every 3 weeks. The main hematological toxicity was leukopenia (7/30 patients, WHO grade ≥ 3) and the main nonhematological toxicity was nausea and vomiting (21/30 patients, WHO grade ≥ 2). Serious nephrotoxicity was observed early in the renal cancer study and, later, also in the melanoma study. Hyperhydration did not prevent the nephrotoxicity, and the studies were stopped after 6 renal cancer patients and 24 malignant melanoma patients had been included. Zeniplatin gave objective responses in 3 of the 21 evaluable malignant melanoma patients [2 complete responses (CRs) in patients with lymph-node metastases lasted 5 and 14 months, respectively; 1 partial response (PR) in a patient with lymph-node and liver metastases lasted 6 months]. In the renal cancer study, only four patients were evaluable for response and none responded. The results show that zeniplatin has some activity (14%) in patients with advanced malignant melanoma, but no conclusion can be drawn regarding the activity of zeniplatin in renal cancer as the number of patients was too low. The main toxicities were leukopenia and nausea and vomiting. Unexpected and serious nephrotoxicity was observed, and for this reason the studies were terminated before the planned number of patients had been included. A possible explanation for the nephrotoxicity may be drug interactions, but no firm conclusion can yet be drawn. Received: 16 March 1996 / Accepted: 25 March 1997  相似文献   
7.
OBJECTIVE: We assessed the risk of prostate cancer by exposure to Chlamydia trachomatis. METHOD: Seven hundred thirty eight cases of prostate cancer and 2,271 matched controls were identified from three serum sample banks in Finland, Norway, and Sweden by linkage to the population based cancer registries. RESULTS: A statistically significant inverse association (odds ratio, 0.69; 95% confidence interval, 0.51-0.94) was found. It was consistent by different serotypes and there was a consistent dose-response relationship. CONCLUSION: C. trachomatis infection is not likely to increase the risk of prostate cancer. Whether the inverse relationship is true or due to difficulties in measuring the true exposure in prostatic tissue by serology, confounders or other sources of error remain open.  相似文献   
8.
9.
Abstract

Two operated cases of aorto-caval fistula due to ruptured abdominal aneurysm are reported. This is a rare and real surgical emergency and is fatal without operation. The classical symptoms of high-output failure occurring simultaneously with the findings of an expansible abdominal mass with thrill and bruit should facilitate clinical diagnosis.  相似文献   
10.
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