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   3589篇
  免费   368篇
  国内免费   64篇
耳鼻咽喉   12篇
儿科学   216篇
妇产科学   153篇
基础医学   252篇
口腔科学   11篇
临床医学   293篇
内科学   928篇
皮肤病学   75篇
神经病学   248篇
特种医学   57篇
外科学   355篇
综合类   144篇
预防医学   215篇
眼科学   37篇
药学   141篇
中国医学   20篇
肿瘤学   864篇
  2024年   11篇
  2023年   69篇
  2022年   42篇
  2021年   78篇
  2020年   82篇
  2019年   30篇
  2018年   131篇
  2017年   114篇
  2016年   130篇
  2015年   102篇
  2014年   124篇
  2013年   118篇
  2012年   262篇
  2011年   354篇
  2010年   153篇
  2009年   141篇
  2008年   307篇
  2007年   258篇
  2006年   229篇
  2005年   206篇
  2004年   236篇
  2003年   189篇
  2002年   188篇
  2001年   115篇
  2000年   64篇
  1999年   49篇
  1998年   44篇
  1997年   31篇
  1996年   32篇
  1995年   16篇
  1994年   20篇
  1993年   14篇
  1992年   10篇
  1991年   10篇
  1990年   8篇
  1989年   10篇
  1988年   6篇
  1987年   3篇
  1986年   12篇
  1985年   9篇
  1984年   2篇
  1983年   1篇
  1982年   2篇
  1981年   3篇
  1980年   1篇
  1979年   1篇
  1978年   1篇
  1977年   1篇
  1976年   1篇
  1973年   1篇
排序方式: 共有4021条查询结果,搜索用时 15 毫秒
41.
张卫东  黄子林  吴沛宏 《医学争鸣》2009,(18):1778-1780
目的:探讨肾转移瘤的CT诊断特征.方法:回顾性分析12例肾转移瘤及12例原发性肾癌的CT表现.结果:12例肾转移瘤共检出42个病灶,4例单发,8例为双侧、多灶性;9个病灶位于肾髓质内呈楔形,33个病灶累及肾皮髓质、呈类圆形;41个病灶平扫呈等密度,所有病灶增强后均呈轻度强化,均未见包膜;8个病灶引起肾轮廓改变;7例肾转移瘤同时伴有其它部位及脏器的转移.12例肾原发癌均为单发,同时累及肾皮髓质,呈类圆形或不规则形;10例病灶平扫呈等、低密度;1例增强后轻度强化,11例增强后呈中、重度不均匀强化,3例可见假包膜;10例引起肾轮廓改变;2例伴有肾静脉癌栓,1例伴有肾周淋巴结转移.结论:肾转移瘤具有典型的影像学特点,了解这一特点有助于肾转移瘤的诊断.  相似文献   
42.
1982年以来,我们对35例伴明显营养不良的中晚期胃癌病人施行了全胃切除术。8例未采用特殊的营养支持疗法,术后发生食道空肠吻合口痿3例(37%),均死亡;27例经空肠插管早期供给高营养饮食,结果亦发生吻合口瘘3例(11%),均治愈。本文采用较粗的空肠营养管,灌注自制高营养饮食,未见重大不良反应。术后病人体重、Hb及ALB比未用高营养饮食病人恢复为好,能在手术后早期接受化疗。作者对空肠营养的方法、护理、作用及副作用进行了讨论,认为早期空肠营养具有效果明显、经济、安全、简便的优点,适用于营养不良的全胃切除术病人使用。  相似文献   
43.
胆道系统恶性肿瘤在世界范围内虽然不算常见,但其发病率逐年上升,且恶性程度较高.我国胆道系统恶性肿瘤的发病率也有逐年上升的趋势.胆管癌患者的预后均很差,因此,胆道系统恶性肿瘤的姑息和支持治疗尤为重要,其主要目的 是尽可能地提高生活质量、延长生存时间.肝门部胆管癌患者术后早期进食能够有效减少感染、腹胀和尿潴留等并发症的发生...  相似文献   
44.
早期直肠癌是指仅限于粘膜或粘膜下层的直肠恶性肿瘤,由于其无淋巴结转移,外科局部切除就可达到治疗目的。1993~1994年期间作者针对距肛门5~10cm的5例早期直肠肿瘤患者,施行了非开腹后方径路外科局部切除术,经临床观察效果满意,本文就其手术适应证进行了探讨。笔者认为:(1)此法可在直视下行肿瘤切除,费时少,风险小;(2)同时能进行直肠旁淋巴结清扫;(3)保留肛门功能的三大特点。  相似文献   
45.
Health related quality of life (HRQoL) of living kidney donors on average is good, but some donors experience a low HRQoL after donation. This study assessed the prevalence of reduced HRQoL and explored associations with pre‐ and post‐donation variables. 316 donors (response rate 74%) who donated a kidney between 1997 and 2009 filled in a questionnaire. HRQoL was measured using the Short‐Form 36; fatigue using the Multidimensional Fatigue Inventory; societal participation using the Utrecht Scale for Evaluation of Rehabilitation‐Participation. Donors on average had better HRQoL than the general population. However, 12% had a reduced physical (PCS) and 18% a reduced mental (MCS) HRQoL. Donors with reduced HRQoL reported greater fatigue (P < 0.01), lower societal participation (P < 0.01) and showed a trend towards statistical significance in experiencing more donor–recipient relationship changes (P = 0.07). Prior to donation, donors with reduced PCS had a higher BMI (P < 0.05) and more often smoked (P < 0.05). Donors with reduced MCS had higher expectations (P < 0.05). Reduced HRQoL is associated with higher BMI, smoking and higher expectations prior to donation. These results may be used to develop a screening instrument to select donors at high risk for reduced HRQoL.  相似文献   
46.
47.
Gastric cancer is the second leading cause of cancerrelated deaths worldwide.Conventional cytotoxic chemotherapy has limited efficacy for metastatic gastric cancer,with an overall survival of approximately ten months.Recent advances in high-throughput technologies have enabled the implementation of personalized cancer therapy for high-risk patients.The use of such high-throughput technologies,including microarray and next generation sequencing,have promoted the discovery of novel targets that offer new treatment strategies for patients lacking other therapeutic options.Many molecular pathways are currently under investigation as therapeutic targets in gastric cancer,including those related to the epidermal growth factor receptor family,the mesenchymal-epithelial transition factor axis,and the phosphatidylinositol 3-kinase-AKTmammalian target of rapamycin factors.Advances in molecular diagnostic tools further support the discovery of new molecular targets.Limitations exist,however;not all patients can be tested for biomarkers,and numerous challenges hamper implementation of targeted therapy in clinical settings.Indeed,the scale of tumor genomic profiling is rapidly outpacing our ability to appropriately synthesize all the information in order to optimally refine patient care.Therefore,clinicians must continue to educate themselves regarding new tools and frameworks,and to utilize multidisciplinary team science,comprised of oncologists,geneticists,pathologists,biologists and bioinformaticians,to successfully implement this genomic approach therapeutically.  相似文献   
48.
49.
Aim Doppler‐guided transanal haemorrhoid dearterialization (THD) and stapler haemorrhoidopexy (SH) have been demonstrated to be less painful than the Milligan–Morgan procedure. The aim of this study was to compare the effectiveness of THD vs SH in the treatment of third‐degree haemorrhoids in an equivalent trial. Method One hundred and sixty‐nine patients with third‐degree haemorrhoids were randomized online to receive THD (n = 85) or SH (n = 84) in 10 Colorectal Units in which the staff were well trained in both techniques. The mean follow‐up period was 17 (range 15–20) months. Results Early minor postoperative complications occurred in 30.6% of patients in the THD group and in 32.1% of patients in the SH group. Milder spontaneous pain and pain on defecation were reported in the THD group in the first postoperative week, but this was not statistically significant. Late complications were significantly higher (P = 0.028) in the SH group. Residual haemorrhoids persisted in 12 patients in the THD group and in six patients in the SH group (P = 0.14). Six patients in the SH group and 10 in the THD group underwent further treatment of haemorrhoids (P = 0.34). No differences were found in postoperative incontinence. The obstructed defecation score (ODS) was significantly higher in the SH group (P < 0.02). Improvement in quality of life was similar in both groups. Postoperative in‐hospital stay was 1.14 days in the THD group and 1.31 days in the SH group (P = 0.03). Conclusion Both THD and SH techniques are effective for the treatment of third‐degree haemorrhoids in the medium term. THD has a better cost‐effective ratio and lower (not significant) pain compared with SH. Postoperative pain and recurrence did not differ significantly between the two groups.  相似文献   
50.
ABSTRACT

Objectives: The BRIDGE study has previously shown a high short-term (12 weeks) adherence rate (>85%) of patients with relapsing-remitting multiple sclerosis (RRMS) to subcutaneous self-injections of interferon β-1a using an electronic auto-injection device (RebiSmart®). The primary goal of the RIVER study was to investigate in a real-life setting the long-term adherence to the use of RebiSmart among patients enrolled in the parent BRIDGE study.

Methods: The RIVER study was designed as a real-life extension study of the BRIDGE trial. RRMS patients who completed BRIDGE and still had an indication for treatment were included. Data were collected prospectively through the RebiSmart device, and analyzed retrospectively. Long term adherence (administration of ≥ 80% of injections) to and safety of RebiSmart were assessed. The expected follow-up period ranged from 19 to 26 months.

Results: A total of 57 RRMS patients participated in the follow-up study. The mean observation period was 20.5 ± 5.7 months. The overall adherence to the use of RebiSmart in the entire study cohort was 79.8% (median = 85.2%, range = 16–100%). There were 36 patients (63.2%) who completed at least 80% of the scheduled injections. No statistically significant differences were found between adherent and non-adherent patients in terms of age, sex, duration of the observation period, and occurrence of relapses. No serious treatment-related adverse events occurred.

Conclusions: This study showed a high level of long-term adherence to the use of RebiSmart, with 63.2% of participants meeting the criterion for adherence to treatment.  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