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   1329篇
  免费   73篇
  国内免费   6篇
耳鼻咽喉   99篇
儿科学   33篇
妇产科学   43篇
基础医学   73篇
口腔科学   23篇
临床医学   312篇
内科学   89篇
皮肤病学   7篇
神经病学   17篇
特种医学   39篇
外科学   260篇
综合类   190篇
预防医学   106篇
眼科学   13篇
药学   77篇
中国医学   10篇
肿瘤学   17篇
  2024年   2篇
  2023年   10篇
  2022年   37篇
  2021年   49篇
  2020年   32篇
  2019年   40篇
  2018年   51篇
  2017年   31篇
  2016年   44篇
  2015年   45篇
  2014年   106篇
  2013年   83篇
  2012年   80篇
  2011年   97篇
  2010年   60篇
  2009年   65篇
  2008年   69篇
  2007年   45篇
  2006年   45篇
  2005年   46篇
  2004年   44篇
  2003年   26篇
  2002年   38篇
  2001年   20篇
  2000年   20篇
  1999年   10篇
  1998年   20篇
  1997年   17篇
  1996年   20篇
  1995年   13篇
  1994年   11篇
  1993年   12篇
  1992年   14篇
  1991年   11篇
  1990年   7篇
  1989年   10篇
  1988年   10篇
  1987年   10篇
  1986年   10篇
  1985年   10篇
  1984年   5篇
  1983年   5篇
  1982年   5篇
  1981年   6篇
  1980年   6篇
  1979年   3篇
  1978年   2篇
  1977年   3篇
  1976年   2篇
  1973年   1篇
排序方式: 共有1408条查询结果,搜索用时 15 毫秒
21.
输卵管镜是用于检查输卵管腔的显微内窥镜,其经过宫腔镜、腹腔镜、生育镜的引导,或单独进入输卵管内,可检查输卵管管腔是否通畅,有无狭窄、粘连、梗阻、充血、积液、息肉、憩室、子宫内膜异位病灶等,评价输卵管的功能,能纠正传统输卵管通畅性检查的假阳性和假阴性结果,还可以对病变进行活检,并同时疏通输卵管,能够兼顾诊断与治疗。输卵管镜检查可以明确输卵管性不孕的原因,病变严重时需及时选择体外受精-胚胎移植(in vitro fertilization and embryo transfer,IVF-ET),而病变较轻时保守性手术治疗可以显著提高不孕症患者的自然受孕率。随着生殖医学技术的发展和对输卵管研究的不断深入,输卵管镜显示出明显的优势,在输卵管疾病诊治方面发挥不可替代的作用。对近年国内外有关输卵管镜诊治的进展进行综述,总结输卵管镜诊治的临床应用价值。  相似文献   
22.
23.
IntroductionPrimary ciliary dyskinesia (PCD) is an autosomal recessive genetic disease, which primarily manifests with oto-sino-pulmonary symptoms. Otitis media with effusion (OME) is common from early childhood. The existing literature on OME management in PCD is conflicting.The goals of the present study were firstly to evaluate the long-term hearing in PCD patients and secondly to determine the influence of ventilation tube (VT) insertion on hearing and postoperative otorrhoea.MethodsA longitudinal retrospective study extracting the hearing level (pure tone average (0.5, 1, 2, 4 kHz, PTA)) and tympanometry from the medical records. Furthermore, the patient files were reviewed for VT insertion and postoperative otorrhoea. Postoperative otorrhoea was defined prolonged when it lasted for four weeks or longer.ResultsFifty-seven patients were identified in a 30-year period, age 2–72 years, and 278 audiometries were evaluated. The median number of audiometries per patient was 3 (range 1–29) and the median follow-up was 60 months (range 0–351 months). The mean PTA was 34 dB HL in patients below six years of age and improved significantly (p < 0.0001) with age. VT insertion improved hearing; however, 48% of patients with VT insertion experienced prolonged otorrhoea.ConclusionIn this study of PCD patients the hearing improved as a function of age as well as following VT insertion. However, VT insertion was also associated with prolonged otorrhoea.  相似文献   
24.
Aerosolized chemotherapeutics leads to higher, localized and continuous concentrations of active agents in lung tissue with lower side effects for other organs. The present study was performed on jugular vein cannulated rats which endothracheally received 4 mg/kg of free paclitaxel powder (Free-PTX), paclitaxel-loaded alginate microparticles (PTX-ALG-MPs) and i.v. paclitaxel (Anzatax®). Pharmacokinetic parameters for Free-PTX and PTX-ALG-MPs contain higher AUC, mean residence time (MRT),half-life and bioavailability, with lower elimination constant (ke). Statistical analysis showed that the amount of paclitaxel per gram of lung tissue after 0.5, 6 and 24 h after administration of Free-PTX was lower than PTX-ALG-MPs. Lung tissue AUC for Free-PTX was lower than PTX-ALG-MPs. According to the obvious advantages obtained, such as dose lowering and increasing paclitaxel residence time and half-life. It should be noted that cell cytotoxicity test on normal airway cell lines was not examined in this study but due to previous reports on safety of inhaled paclitaxel, it can be suggested that pulmonary delivery of paclitaxel can be a useful non-invasive route of administration compared with i.v administration.  相似文献   
25.
The historical development of non-electric aids to hearing is traced and a classification of the different types presented. Comparative measures of their different acoustical characteristics will be shown, indicating their relative value in various types of hearing losses. Attitudes towards such devices and principles involved in their selection in the 19th Century are discussed.  相似文献   
26.

Purpose

In hospital-based studies, patients intubated by physicians while in an inclined position compared to supine position had a higher rate of first pass success and lower rate of peri-intubation complications. We evaluated the impact of patient positioning on prehospital endotracheal intubation in an EMS system with rapid sequence induction capability. We hypothesized that patients in the inclined position would have a higher first-pass success rate.

Methods

Prehospital endotracheal intubation cases performed by paramedics between 2012 and 2017 were prospectively collected in airway registries maintained by a metropolitan EMS system. We included all adult (age?≥?18?years) non-traumatic, non-arrest patients who received any attempt at intubation. Patients were categorized according to initial positioning: supine or inclined. The primary outcome measure was first pass success with secondary outcomes of laryngoscopic view and challenges to intubation.

Results

Of the 13,353 patients with endotracheal intubation attempted by paramedics during the study period, 4879 were included for analysis. Of these, 1924 (39.4%) were intubated in the inclined position. First pass success was 86.3% among the inclined group versus 82.5% for the supine group (difference 3.8%, 95% CI: 1.5%–6.1%). First attempt laryngeal grade I view was 62.9% in the inclined group versus 57.1% for the supine group (difference 5.8%, 2.0–9.6). Challenges to intubation were more frequent in the supine group (42.3% versus 38.8%, difference 3.5%, 0.6–6.3).

Conclusion

Inclined positioning was associated with a better grade view and higher rate of first pass success. The technique should be considered as a viable approach for prehospital airway management.  相似文献   
27.
目的探究在院前心脏停搏患者应用气管插管和球囊辅助呼吸进行急救的效果。方法选自本院2010年2012年进行院前急救的心脏停搏患者共50例,以随机的方式分为对照组与观察组,每组各有患者25例。对照组患者接受气管插管辅助呼吸,观察组患者接受球囊人工通气治疗。对比2组患者的各项临床指标。结果相对于对照组患者,观察组患者在建立通气时间方面有显著优越性,二者对比具有统计学意义(P<0.05);其余各项临床指标对比无统计学意义(P>0.05)。结论对心脏停搏患者进行院前急救的时候,应用球囊或者气管插管的急救方法,在临床效果对比方面相似,但是球囊辅助呼吸建立通气的时间要比气管插管短很多。  相似文献   
28.
29.
30.
目的 探讨护理干预对输卵管结扎术后心理问题的作用.方法 将1 020例行输卵管结扎术的妇女随机分为干预组和对照组,每组510例.干预组根据不同的心理问题进行护理干预,对照组不进行干预.结果 干预组合作型比例明显高于对照组(P<0.01),在紧张、恐惧和焦虑等方面明显低于对照组(P<0.01);干预组的疼痛程度低于对照组(P<0.01).结论 护理干预对输卵管结扎术后心理问题有积极作用.  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