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   516篇
  免费   32篇
  国内免费   5篇
耳鼻咽喉   2篇
儿科学   21篇
妇产科学   2篇
基础医学   46篇
口腔科学   7篇
临床医学   38篇
内科学   112篇
皮肤病学   6篇
神经病学   27篇
特种医学   7篇
外科学   132篇
综合类   17篇
预防医学   41篇
眼科学   8篇
药学   28篇
中国医学   3篇
肿瘤学   56篇
  2024年   1篇
  2023年   5篇
  2022年   9篇
  2021年   25篇
  2020年   12篇
  2019年   11篇
  2018年   15篇
  2017年   16篇
  2016年   17篇
  2015年   20篇
  2014年   21篇
  2013年   43篇
  2012年   52篇
  2011年   54篇
  2010年   23篇
  2009年   20篇
  2008年   32篇
  2007年   29篇
  2006年   24篇
  2005年   30篇
  2004年   15篇
  2003年   23篇
  2002年   22篇
  2001年   2篇
  2000年   3篇
  1999年   3篇
  1998年   5篇
  1997年   2篇
  1996年   2篇
  1995年   1篇
  1994年   3篇
  1993年   3篇
  1992年   1篇
  1988年   2篇
  1987年   1篇
  1986年   2篇
  1984年   1篇
  1970年   1篇
  1969年   1篇
  1967年   1篇
排序方式: 共有553条查询结果,搜索用时 15 毫秒
11.

Background  

There is no data on the histopathological characteristics of renal tumours in young adults in Pakistan.  相似文献   
12.
Background and Aim: Nocturnal gastro‐esophageal reflux causes heartburn and sleep disturbances impairing quality of life. Lifestyle modifications, like bed head elevation during sleep, are thought to alleviate the symptoms of gastroesophageal reflux. We tested the hypothesis that bed head elevation might decrease recumbent acid exposure compared to sleeping in a flat bed. Methods: Patients of symptomatic nocturnal reflux and documented recumbent (supine) reflux verified by esophageal pH test entered the trial. On day 1, baseline pH was measured while the patient slept on a flat bed. Then patients slept on a bed with the head end elevated by a 20‐cm block for the next 6 consecutive days from day 2 to day 7. The pH test was repeated on day 2 and day 7. Each patient acted as his own control. Results: Twenty of 24 (83.3%) patients with mean age of 36 ± 5.5 years completed the trial. The mean (± SD) supine reflux time %, acid clearance time, number of refluxes 5 min longer and symptom score on day 1 and day 7 were 15.0 ± 8.4 and 13.7 ± 7.2; P = 0.001, 3.8 ± 2.0 and 3.0 ± 1.6; P = 0.001, 3.3 ± 2.2 and 1.0 ± 1.2; P = 0.001, and 2.3 ± 0.6 and 1.5 ± 0.6; P = 0.04, respectively. The sleep disturbances improved in 13 (65%) patients. Conclusions: Bed head elevation reduced esophageal acid exposure and acid clearance time in nocturnal (supine) refluxers and led to some relief from heartburn and sleep disturbance.  相似文献   
13.
14.

Background

Studies of interventions for urethral stricture have inferred patient benefit from clinician-driven outcomes or questionnaires lacking scientifically robust evidence of their measurement properties for men with this disease.

Objective

To evaluate urethral reconstruction from the patients’ perspective using a validated patient-reported outcome measure (PROM).

Design, setting, and participants

Forty-six men with anterior urethral stricture at four UK urology centres completed the PROM before (baseline) and 2 yr after urethroplasty.

Intervention

A psychometrically robust PROM for men with urethral stricture disease.

Outcome measurements and statistical analysis

Lower urinary tract symptoms (LUTS), health status, and treatment satisfaction were measured, and paired t and Wilcoxon matched-pairs tests were used for comparative analysis.

Results and limitations

Thirty-eight men underwent urethroplasty for bulbar stricture and eight for penile stricture. The median (range) follow-up was 25 (20–30) mo. Total LUTS scores (0 = least symptomatic, 24 = most symptomatic) improved from a median of 12 at baseline to 4 at 2 yr (mean [95% confidence interval (CI)] of differences 6.6 [4.2–9.1], p < 0.0001). A total of 33 men (72%) felt their urinary symptoms interfered less with their overall quality of life, 8 (17%) reported no change, and 5 (11%) were worse 2 yr after urethroplasty. Overall, 40 men (87%) remained “satisfied” or “very satisfied” with the outcome of their operation. Health status visual analogue scale scores (100 = best imaginable health, 0 = worst) 2 yr after urethroplasty improved from a mean of 69 at baseline to 79 (mean [95% CI] of differences 10 [2–18], p = 0.018). Health state index scores (1 = full health, 0 = dead) improved from 0.79 at baseline to 0.89 at 2 yr (mean [95% CI] of differences 0.10 [0.02–0.18), p = 0.012]).

Conclusions

This is the first study to prospectively evaluate urethral reconstruction using a validated PROM. Men reported continued relief from symptoms with related improvements in overall health status 2 yr after urethroplasty. These data can be used as a provisional reference point against which urethral surgeons can benchmark their performance.  相似文献   
15.

Purpose

A conventional midline posterior approach is used for most of the described surgical techniques. We describe a technique of percutaneous fixation of the pars interarticularis, augmented where necessary by grafting the defect, which minimises muscle injury.

Method

A 4.5 mm partially threaded dynamic compression screw is placed over a wire inserted percutaneously across the pars interarticularis defect. Compression is achieved across the pars interarticularis defect on placement of the screw. The screw is locked in a compressed state.

Results

The patient is mobilised the same day with a corset for comfort and discharged the following day. Aerobic fitness is maintained for 3 months; then, focused rehabilitation performed until a CT scan confirms healing at 5–6 months, at which stage full (sports) activity is resumed.

Conclusions

The minimal tissue injury and small incision used allow for the minimising of complications and for a rapid recovery and discharge from hospital. With adolescents, we have the opportunity to treat symptomatic pars interarticularis defects with minimal disruption to their academic and physical development.
  相似文献   
16.
17.
A series of bisindolylmethanes (BIMs) (1a7j) including hybrid BIMs 6a6c were prepared for bioevaluation. The results of initial antimicrobial screening of compounds 1a6c showed compounds 2b, 2m, 4a and 5b to be the most potent inhibitors, exhibiting MIC as well as MBC values equal to or less than that of ciprofloxacin (0.5–2 μg/mL) against Staphylococcus aureus, MRSA and VRE. Compound 2m was selected further to study the effect of N,N′ disubstitution towards antibacterial and antitumor activity. It was observed that substitution at N,N′ position (7a7j) of 2m diminishes its antibacterial activity though in vitro antitumour activity against a panel of prostate, cervical and lung cancer cell lines remains more or less intact.  相似文献   
18.
19.

INTRODUCTION

Meckel''s diverticulum is the most common congenital anomaly of the small intestine. Common complications related to Meckel''s diverticulum include hemorrhage, intestinal obstruction and inflammation. Acute large bowel obstruction is a rare complication of Meckel''s diverticulum and in the presented case it is caused by volvulus.

PRESENTATION OF CASE

We report a 39 year old female who presented with the diagnosis of a large bowel obstruction occurring as a result of cecal volvulus caused by adhesions of a perforated diverticulum.

DISCUSSION

The reported case presents one of the rare complications of MD, which is volvulus. The case described above presented with signs and symptoms suggestive of acute intestinal obstruction and radiological findings suggestive of cecal volvulus. The patient was taken to the operation room for exploration and we discovered the presence of a perforated MD. The main treatment of such case is to perform diverticulectomy in all symptomatic patients.

CONCLUSION

MD is mostly identified intraoperatively. Knowledge of the pathophysiologies by which MD can cause complications such as volvulus is important in order to plan management.  相似文献   
20.
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