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   47021篇
  免费   5059篇
  国内免费   3423篇
耳鼻咽喉   468篇
儿科学   594篇
妇产科学   443篇
基础医学   4630篇
口腔科学   747篇
临床医学   5880篇
内科学   6092篇
皮肤病学   355篇
神经病学   2042篇
特种医学   1677篇
外国民族医学   14篇
外科学   4695篇
综合类   10474篇
现状与发展   20篇
一般理论   4篇
预防医学   3754篇
眼科学   1132篇
药学   5196篇
  65篇
中国医学   3793篇
肿瘤学   3428篇
  2024年   226篇
  2023年   843篇
  2022年   2130篇
  2021年   2680篇
  2020年   2163篇
  2019年   1619篇
  2018年   1587篇
  2017年   1574篇
  2016年   1382篇
  2015年   2176篇
  2014年   2845篇
  2013年   2668篇
  2012年   3564篇
  2011年   4012篇
  2010年   3001篇
  2009年   2549篇
  2008年   2849篇
  2007年   2680篇
  2006年   2412篇
  2005年   2100篇
  2004年   1657篇
  2003年   1629篇
  2002年   1386篇
  2001年   1117篇
  2000年   907篇
  1999年   801篇
  1998年   455篇
  1997年   533篇
  1996年   358篇
  1995年   348篇
  1994年   267篇
  1993年   189篇
  1992年   156篇
  1991年   138篇
  1990年   120篇
  1989年   113篇
  1988年   83篇
  1987年   70篇
  1986年   41篇
  1985年   36篇
  1984年   14篇
  1983年   8篇
  1982年   6篇
  1981年   6篇
  1980年   3篇
  1979年   2篇
排序方式: 共有10000条查询结果,搜索用时 24 毫秒
41.
目的:探讨高血压以昼夜血压模式指导药物治疗的疗效。方法:124例高血压患者被随机分为两组:观察组80例,采用以昼夜血压模式为依据,指导选用药物进行治疗,着重加强异常升高血压部份的降压治疗,同时加强血压监测;对照组仍按照常规方法治疗,6周为1疗程,治疗前和治疗后都检测血压和24小时动态血压。结果:观察组降压的总有效率和昼夜血压模式转为正常杓形态明显高于对照组,结论:高血压病患者以昼夜血压模式为依据指导用药降压治疗有较好的医疗效果。  相似文献   
42.
目的:应用微乳液反应法制备磺胺嘧啶银均匀微晶,均匀制得的微晶的粒径大小约为2~4um,均匀微晶的结晶性好,纯度高。用均匀设计方法优化条件,制备的均匀的微晶平均粒径大小为2.09um,实验结果达到预测结果要求。结论:用微乳液反应法能获得磺胺嘧啶银均匀微晶。  相似文献   
43.
目的:为临床应用混合抗体进行放射免疫治疗提供实验依据。方法:在裸鼠荷人大肠癌Lovo移植瘤生长至1cm时,瘤内分别或同时注射~(131)I标记的抗CL_3单克隆抗体(~(131)I-CL_3)和~(131)I标记抗FERR单克隆抗体T_9(~(131)I-T_9),治疗后行SPECT显像观察标记抗体在肿瘤内的浓聚,并进行疗效观察。结果:我们发现两种抗体混合治疗组疗效明显好于单独治疗组,抗体在肿瘤内的浓聚也大于单独应用。结论:多种抗体混合应用瘤内注射放射免疫治疗可增加标记抗体在肿瘤内的浓聚,并能提高放射免疫治疗的疗效。  相似文献   
44.
Haibin  Wei  Lin  Qian  Junxiu  Wu  Heng  Wang  Qi  Zhang  Yanpeng  Wang  Dahong  Zhang 《Lasers in medical science》2021,36(6):1191-1200

The benefit of transurethral laser prostatectomy over open simple prostatectomy (OSP) is controversial in aged symptomatic benign prostatic hyperplasia (BPH) patients with large volume prostates, and the aim of this study is to compare the safety and efficiency of these two methods. Meta-analysis was applied using the Review Manager V5.3 software and the retrieved randomized controlled clinical trials (RCTs) comparing transurethral laser prostatectomy with OSP were analyzed for the treatment of large volume prostates from 2000 to 2019 in PubMed, Web of Science, Cochrane, and EMBASE datasets. Five RCTs assessing transurethral laser prostatectomy versus OSP were considered suitable for this meta-analysis, which included a total of 448 patients, with 232 patients undergoing laser and 216 patients undergoing OSP. Compared with OSP, although transurethral laser prostatectomy required a longer operative time (weighted mean difference (WMD) 27.49 mins; 95% confidence interval (CI) 16.54–38.44; P?<?0.00001) and obtained a less resected prostate weight (WMD ??11.72 g; 95% CI ??21.75 to ??1.70; P?=?0.02), patients undergoing laser prostatectomy benefited from significantly less hemoglobin decline (??0.97 g/dL; 95% CI ??1.31 to ??0.64; P?<?0.00001), shorter time of catheterization (WMD ??3.67 days; 95% CI ??5.60 to ??1.75; P?=?0.0002), shorter length of hospital stay (WMD ??4.75 days; 95% CI ??6.57 to ??2.93; P?<?0.00001), and less blood transfusion (odds ratio 0.10; 95% CI 0.03 to 0.35; P?=?0.0003). During postoperative follow-up, no significant difference was observed between the two groups in IPSS, QoL, Qmax, and PVR. Both transurethral laser prostatectomy and OSP are safe and effective for large prostates that require prostate resection. Taking into account of less blood loss, shorter catheterization time and hospital stay, and less blood transfusion, transurethral laser prostatectomy may be a better treatment for patients with large prostates.

  相似文献   
45.
46.
Xu  Yangyang  He  Qi  Wang  Mengqi  Gao  Yuan  Liu  Xiaowei  Li  Denghui  Xiong  Botao  Wang  Wei 《Neurosurgical review》2021,44(1):115-127
Neurosurgical Review - Magnetic resonance imaging-guided focused ultrasound (MRgFUS) neurosurgery is a new option for medication-resistant Parkinson’s disease (PD), but its safety and...  相似文献   
47.
48.
Screening for aorto-iliac stenosis is important in kidney transplant candidates as its presence affects pre-transplantation decisions regarding side of implantation and the need for an additional vascular procedure. Reliable imaging techniques to identify this condition require contrast fluid, which can be harmful in these patients. To guide patient selection for these imaging techniques, we aimed to develop a prediction model for the presence of aorto-iliac stenosis. Patients with contrast-enhanced imaging available in the pre-transplant screening between January 1st, 2000 and December 31st, 2018 were included. A prediction model was developed using multivariable logistic regression analysis and internally validated using bootstrap resampling. Model performance was assessed with the concordance index and calibration slope. Three hundred and seventy-three patients were included, 90 patients (24.1%) had imaging-proven aorto-iliac stenosis. Our final model included age, smoking, peripheral arterial disease, coronary artery disease, a previous transplant, intermittent claudication and the presence of a femoral artery murmur. The model yielded excellent discrimination (optimism-corrected concordance index: 0.83) and calibration (optimism-corrected calibration slope: 0.91). In conclusion, this prediction model can guide the development of standardized protocols to decide which patients should receive vascular screening to identify aorto-iliac stenosis. External validation is needed before this model can be implemented in patient care.  相似文献   
49.
王彩云  蔡慧君  况琦 《新中医》2023,55(13):208-211
慢性非特异性腰痛是康复科门诊常见疾病之一,由于其具体病理机制还未完全阐明,目前临床治疗多以对症治疗为主。张海峰主任结合自身临证经验,根据非特异性腰痛的疾病特点,认为其多是以人体体用关系失和所致。人体以一元之气为“体”,脏腑经络的外在功能为“用”。脾肾亏虚,运化失职,气化失常,气血不充,一元之气虚衰,不荣则痛,发为腰痛;气虚血瘀,阻滞经络,又或再受邪气侵犯,寒湿阻滞,不通则痛,而成本虚标实之证。张主任据此提出通补元气、化瘀止痛的治疗法则,并且结合中西医及康复物理治疗等方法,疗效甚佳。  相似文献   
50.
ObjectivesTo examine length of stay (LOS) and readmission rates for all minimally-invasive partial nephrectomy (MIPN) and MI radical nephrectomy (MIRN) performed for localized renal masses ≤7 cm in size (cT1RM) within 12 Michigan urology practices. Both RN and PN are commonly performed in treating cT1RM. Although technically more complex and associated with higher complication rates, Centers for Medicare & Medicaid Services considers MIPN an outpatient procedure and MIRN is inpatient.MethodsWe collected data for renal surgeries for cT1RM at MUSIC-KIDNEY practices between May 2017–February 2020. Data abstractors recorded clinical, radiographic, pathologic, surgical, and short-term follow-up data into the registry for cT1RM patients.ResultsWithin MUSIC-KIDNEY, 807 patients underwent MI renal surgery at 12 practices. Median LOS for cT1RM patients after MIPN (n = 531, 66%) was 2 days and after MIRN (n = 276, 34%) was also 2 days. Among patients undergoing laparoscopic or robotic PN, 171 (32%), 230 (43%), and 130 (24%) stayed ≤1, 2, ≥3 days. Among patients undergoing laparoscopic or robotic RN, 81 (29%), 112 (41%), and 83 (30%) stayed ≤1, 2, ≥3 days. No significant difference was observed between MIPN and MIRN on LOS commensurate with outpatient surgery (≤1-day, OR = 0.97, P = 0.87).ConclusionsLess than one-third of patients had a LOS ≤1-day and LOS was comparable for MIPN and MIRN. Centers for Medicare & Medicaid Services should be advised that MIPN is a more complex surgery than MIRN, most patients receiving a MIPN will require a ≥2-day hospital stay and it would be more appropriate to classify MIPN an inpatient procedure with MIRN.  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