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   9919篇
  免费   485篇
  国内免费   241篇
耳鼻咽喉   12篇
儿科学   175篇
妇产科学   25篇
基础医学   407篇
口腔科学   8篇
临床医学   1134篇
内科学   1669篇
皮肤病学   14篇
神经病学   1583篇
特种医学   1070篇
外科学   2791篇
综合类   1209篇
预防医学   141篇
眼科学   59篇
药学   252篇
  4篇
中国医学   31篇
肿瘤学   61篇
  2024年   7篇
  2023年   148篇
  2022年   210篇
  2021年   371篇
  2020年   412篇
  2019年   328篇
  2018年   206篇
  2017年   271篇
  2016年   243篇
  2015年   353篇
  2014年   560篇
  2013年   655篇
  2012年   490篇
  2011年   618篇
  2010年   495篇
  2009年   512篇
  2008年   565篇
  2007年   482篇
  2006年   489篇
  2005年   452篇
  2004年   398篇
  2003年   305篇
  2002年   261篇
  2001年   223篇
  2000年   169篇
  1999年   123篇
  1998年   130篇
  1997年   114篇
  1996年   112篇
  1995年   93篇
  1994年   95篇
  1993年   78篇
  1992年   85篇
  1991年   73篇
  1990年   64篇
  1989年   50篇
  1988年   42篇
  1987年   51篇
  1986年   39篇
  1985年   45篇
  1984年   50篇
  1983年   26篇
  1982年   39篇
  1981年   42篇
  1980年   16篇
  1979年   19篇
  1978年   12篇
  1977年   5篇
  1976年   8篇
  1973年   4篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
目的 探讨营养教育在腹主动脉瘤患者根治术中的应用价值。 方法 选取2017年10月至2019年10月青岛市市立 医院收治的行根治术的腹主动脉瘤患者96例,采用随机数字表法分为对照组(48例,行常规护理)和观察组(48例,行常规护理 联合营养教育),比较两组康复效果、营养指标和生活质量,另参照焦虑自评量表(SAS)和抑郁自评量表(SDS)判定患者心理状 态。 结果 观察组首次排气时间、下床活动时间和住院时间短于对照组,心理状态评分低于对照组,依从性和生活质量综合评 定问卷评分高于对照组,差异有统计学意义(P<0.05);观察组患者体重为(68.16±6.32) kg,体质指数为(23.02±0.54)kg/m2,血清 白蛋白水平为(37.2±2.4)g/L,血清转铁蛋白水平为(2.45±0.36)g/L,血清前白蛋白水平为(267.27±25.12)mg/L,总铁结合力为 (56.17±6.24)μmol/L,高于对照组的(64.32±5.44)kg、(21.72±0.78)kg/m2 、(32.1±1.8)g/L、(2.16±0.32)g/L、(215.12±22.26)mg/L和 (50.34±5.21)μmol/L,差异有统计学意义(P<0.05)。 结论 在腹主动脉瘤患者根治术中联合营养教育可促进患者术后康复,对 患者负面情绪有缓解作用,可提高患者依从性,改善营养不良状态,促进生活质量的提升。  相似文献   
3.
PurposeTo test the following hypotheses: (a) balloon or stent assistance increases coil packing density (CPD) in the endovascular treatment of intracranial aneurysms, and (b) CPD correlates to ostium area (OA) and aneurysm volume (AV).Materials and MethodsThis retrospective study included 60 aneurysms (54 ruptured and 6 unruptured) treated with simple coiling (SC) (n = 18), balloon-assisted coiling (BAC) (n = 7), or stent-assisted coiling (SAC) (n = 35) at the authors’ institution between August 2017 and December 2019. AV and OA measurements were obtained from 3-dimensional digital subtraction angiography images using commercial software. Coil sizes were retrieved from patient files, and coil volume (CV) measurements were obtained from https://www.angiocalc.com/. Analysis of covariance, multivariate covariance analysis, and Pearson correlation analyses were performed.ResultsThe median value for AV, CV, CPD, and OA was 63.4 mm3 (range, 5.5–1,771.4 mm3), 23.13 mm3 (range, 2.03–296.95 mm3), 33.29% (range, 13.41%–81.02%), and 10.7 mm2 (range, 2.7–49.9 mm2), respectively. Multivariate analysis showed that the CPD values were not significantly different among the treatment groups, although OA significantly differed between the SC and SAC groups (P < .05). Pearson correlations showed that similar to AV, OA was negatively correlated with CPD (r = ?0.321, P < .05).ConclusionsThe CPD value in cerebral aneurysms treated with BAC or SAC did not differ from that in aneurysms treated with SC.  相似文献   
4.
许琰 《全科护理》2022,20(1):65-67
目的:探讨血流导向装置治疗大脑中动脉M2段以及远部位动脉瘤的围术期护理方法和价值。方法:选取2021年1月—2021年6月山西省某三级甲等医院神经外科16例大脑中动脉M2段以及远部位动脉瘤病人,均进行血流导向装置Pipeline治疗,总结围术期护理要点。结果:16例病人的手术成功率为100%,术后无相关并发症发生。结论:医务人员需高度关注围术期颅内动脉瘤病人,术前给予病人足够的心理支持和疏导,术中与医生、麻醉师、手术室护士紧密配合,术后密切监测并发症的发生,使病人能够安全度过围术期,顺利康复出院。  相似文献   
5.
BackgroundRemodeling of the aortoiliac anatomy is a challenge to the long-term performance of stent grafts for endovascular aneurysm repair. Changes in vessel diameter and length can result in loss of seal at attachment sites, limb disunion, or kinking, with the development of high-pressure endoleaks, migration, or limb occlusion. The aim of this study was to assess the durability and conformability of the ultralow-profile INCRAFT AAA endograft (Cordis Corporation, Milpitas, Calif) during 5-year follow-up.MethodsFrom 2010 to 2011, there were 60 patients (median age, 74 years; range, 60-94 years) with intact abdominal aortic aneurysms who were enrolled in the INNOVATION trial to evaluate the safety, effectiveness, and durability of the INCRAFT AAA device. Clinical and technical success was assessed with protocol-specified, monitored follow-up clinic visits and core laboratory-assessed computed tomography (CT) at 1 month, 6 months, and 12 months after implantation and annually through 5 years thereafter. Diameter and angulation changes at the proximal aortic neck and diameter changes at the iliac attachment zones were measured in addition to the standard CT assessments.ResultsSignificant aortoiliac remodeling was observed throughout long-term follow-up after endovascular aneurysm repair. Proximal aortic neck diameter 15 mm below the lowest main renal artery increased from 23.5 ± 2.5 mm at 1 month to 27.3 ± 2.8 mm at 5 years (P = .002). Neck dilation >5 mm was observed in 8 of 38 patients with 5-year CT studies (21%). The aortic neck straightened, with angulation decreasing from 34 ± 14 degrees preoperatively to 31 ± 11 degrees at 1 month (P < .001) and to 20 ± 12 degrees at 5 years (P = .018). Straightening of the neck was most prominent in patients who presented with a high degree of preoperative angulation (r = 0.61; P < .001). Between 1 month and 5 years, iliac attachment zone diameter increased from 13.5 ± 1.9 mm to 15.0 ± 2.4 mm on the right (P = .002) and from 13.9 ± 2.3 mm to 16.8 ± 2.7 mm on the left (P < .001). During 5 years, 9 of 72 (13%) iliac arteries enlarged >5 mm. There was a significant relationship between main body oversizing and aortic neck enlargement (r = 0.42; P = .009). No similar association was observed between iliac limb oversizing and iliac dilation over time (r = 0.10 and P = .549, right side; r = 0.14 and P = .400, left side). There were no aneurysm-related deaths in the series. There were two type IA endoleaks, both of which were present on the 1-month CT scan and associated with challenging aortic neck anatomy. No patient experienced endograft migration or rupture through 5 years. Type IB endoleaks occurred in two patients, both accompanied by iliac artery dilation and loss of seal. Stent fracture occurred in two struts of the bare transrenal stent of one patient, without loss of fixation or seal. One patient experienced graft limb occlusion and was observed without intervention. There were three patients (5%) with aneurysm sac enlargement (>5 mm) through 5 years, each of whom had type II endoleak.ConclusionsSignificant aortoiliac remodeling occurs after endograft implantation, including proximal aortic neck dilation, straightening of the neck, and iliac artery enlargement. The ultralow-profile INCRAFT device adapted well to these changes, with acceptably low 5-year rates of device-related endoleaks, endograft migration, and limb occlusion.  相似文献   
6.
The purpose of this article is to acquaint the reader with the presentation, diagnosis, and management of Ehlers-Danlos syndrome (EDS), a group of genetic connective tissue disorders. Progressive weakness of connective tissue is the underlying cause of all types of EDS. The symptoms of EDS are numerous, with variability in presentation. However, decreased quality of life caused by chronic pain and fatigue is a commonality of all types of EDS. This article will assist the nurse practitioner in recognizing EDS and offer guidance for treatment.  相似文献   
7.
8.
9.

Objective

Low psoas muscle area is shown to be an indicator for worse postoperative outcome in patients undergoing vascular surgical. Additionally, it has been associated with longer durations of hospital stay in patients with cancer who undergo surgery and subsequently greater health care costs in Europe and the United States. We sought to evaluate this effect on hospital expenditure for patients undergoing vascular repair in a health care system with universal access.

Methods

Skeletal muscle mass was assessed on preoperative abdominal computed tomography scans of patients undergoing open aortic aneurysm repair in a retrospective fashion. The skeletal muscle index (SMI) was used to define low muscle mass. Health care costs were obtained for all patients and the relationship between a low SMI and higher costs was explored using linear regression and cross-sectional analysis.

Results

We included 156 patients (81.5% male) with a median age of 72 years undergoing elective surgery for infrarenal abdominal aortic aneurysm in this analysis. The median SMI for patients with low skeletal muscle mass was 53.21 cm2/kg and for patients without, 70.07 cm2/kg. Hospital duration of stay was 2 days longer in patients with low skeletal muscle mass as compared with patients with normal (14 days vs 11 days; P = .001), as was duration of intensive care stay (3 days vs 1 day; P = .01). The median overall hospital costs were €10,460 higher for patients with a low SMI as compared with patients with a normal physical constitution (€53,739 [interquartile range, €45,007-€62,471] vs €43,279 [interquartile range, €39,509-€47,049]; P = .001). After confounder adjustment, a low SMI was associated with a 14.68% cost increase in overall hospital costs, for a cost increase of €6521.

Conclusions

Low skeletal muscle mass is independently associated with higher hospital as well as intensive care costs in patients undergoing elective aortic aneurysm repair. Strategies to reduce this risk factor are warranted for these patients.  相似文献   
10.
Kawasaki disease (KD) is a potentially decapacitating multisystemic vasculitis with unknown etiology that acquired worldwide attention due to associated coronary aneurysms leading to life-threatening complications in very young babies including thrombosis, ischemia, and rupture. High levels of suspicion for early diagnosis and prompt treatment are crucial in preventing serious complications. We report here one of the patients who developed a giant coronary aneurysm but fortunately not a life-threatening complication after 5?years of follow-up. We conclude that later intravenous immunoglobulins (IVIG) treatment could be an important factor—among others—that precipitate into such complications.  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