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   68542篇
  免费   5549篇
  国内免费   3715篇
耳鼻咽喉   296篇
儿科学   1296篇
妇产科学   436篇
基础医学   4715篇
口腔科学   620篇
临床医学   10303篇
内科学   6030篇
皮肤病学   270篇
神经病学   7261篇
特种医学   4731篇
外国民族医学   2篇
外科学   14074篇
综合类   13208篇
现状与发展   3篇
一般理论   1篇
预防医学   3598篇
眼科学   883篇
药学   6208篇
  38篇
中国医学   3235篇
肿瘤学   598篇
  2024年   96篇
  2023年   1147篇
  2022年   1721篇
  2021年   2955篇
  2020年   2852篇
  2019年   2325篇
  2018年   2384篇
  2017年   2597篇
  2016年   2731篇
  2015年   2565篇
  2014年   4593篇
  2013年   5469篇
  2012年   4408篇
  2011年   4773篇
  2010年   4035篇
  2009年   3789篇
  2008年   3754篇
  2007年   3708篇
  2006年   3488篇
  2005年   3017篇
  2004年   2381篇
  2003年   2127篇
  2002年   1768篇
  2001年   1552篇
  2000年   1280篇
  1999年   1026篇
  1998年   846篇
  1997年   751篇
  1996年   622篇
  1995年   550篇
  1994年   422篇
  1993年   331篇
  1992年   275篇
  1991年   202篇
  1990年   188篇
  1989年   170篇
  1988年   122篇
  1987年   116篇
  1986年   106篇
  1985年   135篇
  1984年   82篇
  1983年   52篇
  1982年   58篇
  1981年   62篇
  1980年   55篇
  1979年   34篇
  1978年   19篇
  1977年   20篇
  1976年   20篇
  1975年   9篇
排序方式: 共有10000条查询结果,搜索用时 20 毫秒
81.
Objective To prove the efficacy of peritoneal dialysis on shock wave-induced acute lung injury of rats, and analyze its mechanisms. Methods Forty-five adult Sprague-Dawley rats were randomly divided into three groups: control group, sham operation (Sham) group and peritoneal dialysis (PD) group. Sham group and PD group did abdominal catheterization before blast injury. The 55 kg shock wave (bst-I) was used to induce lung blast injury. After one hour of blast injury, PD group was given 2.5% peritoneal dialysate 20 ml to stay abdomen, which was released 30 min posted, repeated 12 cycles. After 6 hours of peritoneal dialysis, all of the rats were sacrificed. Partial damaged tissues in lung were used to evaluate the pathomorphologic changes by HE staining, and the remnants were used to measure the lung water content. Lung function was detected by blood gas analyzer and small animal detector from the arterial blood gas. The levels of serum inflammatory factors, such as tumor necrosis factor-α (TNF-α), interleukin (IL)-1β, IL-6 and monocyte chemoattractant protein-1 (MCP-1) were tested by ELISA. Results The relative integrity of alveolar structure, interstitial edema and inflammatory cell infiltration in PD group were significantly improved than those in control group. The lung water content of PD group was significantly lower than that of control group (P<0.05). The levels of TNF-α, IL-1β, IL-6 and MCP-1 in serum of PD group were significantly lower than those in control group (all P<0.05). The blood oxygen saturation, oxygen partial pressure, oxygenation index, vital capacity, functional residual volume and maximum mid-expiratory flow rate in PD group were significantly higher than those in control group (all P<0.05). Conclusions Through reducing pulmonary edema and inflammatory factors, peritoneal dialysis can improve lung function in shock wave -induced acute lung injury of rats.  相似文献   
82.
Kawasaki disease (KD) is a systemic vasculitis frequent in children younger than 5 years of age. It involves coronary arteries and other medium-sized vessels. There also exists evidence of inflammatory and proliferative changes affecting the biliary tract and lymphocyte infiltration of the renal interstitial. We describe the case of a 9-year-old girl who developed high-grade fever, bilateral non-purulent conjunctivitis, «strawberry» tongue, desquamation of the fingers and toes, cholestatic syndrome, edema and elevated serum creatinine. KD is a diagnostic challenge for the pediatrician. In every patient with high-grade fever, cholestasis and acute kidney injury, KD should be included in the differential diagnosis, even though more research is necessary to evaluate this atypical association.  相似文献   
83.

BACKGROUND CONTEXT

Although facet dislocations account for only 6% of cervical trauma, the consequences are often devastating. Cervical facet dislocations are associated with a disproportionate amount of spinal cord injuries; however, neurologic examination of patients is often difficult, as patients commonly present with reduced levels of consciousness. There are limited studies that have investigated the impact of spinal canal diameter and translation on neurologic injury following facet dislocations.

PURPOSE

Review a consecutive series of patients with facet dislocations to assess the impact of sagittal diameter and translation on Spinal Cord Injury (SCI).

STUDY DESIGN

Retrospective review at a level I trauma center identified 97 patients with facet dislocations.

METHODS

Between 2004 and 2014, a retrospective review at a level I trauma center identified patients with traumatic facet dislocation. Demographic data, neurologic exams, and radiographic findings were reviewed. We assessed sagittal diameter at the injury level, as well as above and below, and translation. This study has no funding source and its authors have no potential conflicts of interest-associated biases.

RESULTS

Ninety-seven patients presented with facet dislocations. Fifty-nine (61%) presented with a SCI. Those with ASIA A averaged 8.0 mm of injury level canal diameter, and ASIA E averaged 12.6 mm (p < .001). Additionally, those with ASIA A averaged 8.0 mm of translation, and ASIA E averaged 4.2 mm (p < 0.001). Two groups were created based on their general motor function. Those with ASIA A–C averaged 8.4 mm of injury level canal diameter, and ASIA D–E averaged 12.3 mm (p < .001). Those with ASIA A–C averaged 7.8 mm of translation, and ASIA D–E averaged 4.4 mm (p < .001). Receiver operating characteristic (ROC) curves demonstrated that translation was a good predictor of ASIA A–C and canal diameter was an almost perfect predictor of ASIA D–E.

CONCLUSIONS

Our data indicate that patients with greater translation and/or a smaller canal diameter at the injury level have a higher rate of SCI. Adjacent canal diameter did not correlate with neurologic injury.  相似文献   
84.

Purpose

Examine lifetime prevalence of diagnosed concussion in US-national samples of 8th, 10th, and 12th graders involved in 16 different competitive sports; examine associations between concussion and individual sports, controlling for demographic characteristics and multiple sports involvement.

Methods

Analysis of nationally representative Monitoring the Future data from 2 cohorts (2016–2017; n?=?25,408).

Results

Adolescents who participated in baseball, basketball, football, gymnastics, ice hockey, lacrosse, soccer, track, weightlifting, and ‘other sports’ had greater odds of reporting multiple diagnosed concussions compared with peers not participating in these sports. Adolescents who participated in tennis had lower odds of reporting any diagnosed concussion or multiple concussions. Females who participated in gymnastics, soccer, and swimming showed a stronger association in reporting a diagnosed concussion when compared with males who participated in these same types of sports.

Conclusions

The study provides needed epidemiological information on prevalence of reported diagnosed concussion among teens participating in popular school and community sports. Certain high contact (e.g., football) and high volume (e.g., basketball) sports need increased efforts to manage adolescent athletes who already have a history of concussion or repeated concussions.  相似文献   
85.
《中国现代医生》2020,58(26):168-170+175
目的 探讨集束化护理在心内科危重患者压力性损伤管理中的应用效果。方法 选取2019年7~12月在心内科住院并病情危重的患者70例作为研究对象,分为对照组与观察组,每组各35例,其中对照组给予常规护理,观察组给予集束化护理,并比较分析两组患者压力性损伤的发生率、压力性损伤发生程度、压力性损伤发生时间以及压力性损伤护理满意度的情况。结果 集束化护理管理的观察组压疮发生率要低于常规护理的对照组的压力性损伤发生率(P0.05),观察组患者压力性损伤程度好于对照组(P0.05),观察组患者压力性损伤的发生时间长于对照组患者的压力性损伤发生时间(P0.05),观察组患者经过集束化护理后满意度要高于对照组,差异有统计学意义(P=0.039)。结论 对心内科危重患者进行集束化护理管理措施,能够有效降低心内科患者压力性损伤的发生率及严重程度,同时还延缓了压力性损伤的发生时间,并提升了患者的护理满意度,具有较好的应用效果。  相似文献   
86.
BackgroundEarly detection of consciousness after severe brain injury is critical for establishing an accurate prognosis and planning appropriate treatment.ObjectivesTo determine which behavioural signs of consciousness emerge first and to estimate the time course to recovery of consciousness in patients with severe acquired brain injury.MethodsRetrospective observational study using the Coma Recovery Scale-Revised and days to recovery of consciousness in 79 patients (51 males; 34 with traumatic brain injury; median [IQR] age 48 [26–61] years; median time since injury 26 [20–36] days) who transitioned from coma or unresponsive wakefulness syndrome (UWS)/vegetative state (VS) to the minimally conscious state (MCS) or emerged from MCS during inpatient rehabilitation.ResultsVisual pursuit was the most common initial sign of MCS (41% of patients; 95% CI [30–52]), followed by reproducible command-following (25% [16–35]) and automatic movements (24% [15–33]). Ten other behaviours emerged first in less than 16% of cases. Median [IQR] time to recovery of consciousness was 44 [33–59] days. Etiology did not significantly affect time to recovered consciousness.ConclusionRecovery of consciousness after severe brain injury is most often signalled by reemergence of visual pursuit, reproducible command-following and automatic movements. Clinicians should use assessment measures that are sensitive to these behaviours because early detection of consciousness is critical for accurate prognostication and treatment planning.  相似文献   
87.
烧(创)伤、吸入性损伤、严重感染以及休克等疾病过程中,机体内多种炎性介质的释放,引发炎性细胞向肺组织迁移,激活呈级联放大的炎症反应,常常可造成以肺毛细血管内皮细胞和肺泡上皮细胞损伤为主的急性肺损伤(ALI),严重者短时间内可迅速发展为急性呼吸窘迫综合征(ARDS),病死率极高。ω-3多不饱和脂肪酸(ω-3PUFA)作为药理性免疫营养素的重要组成部分,目前已经超越了以往单纯提供能量、恢复正氮平衡的范畴,发挥着调控机体炎症反应、免疫功能的全面作用,并逐渐演变为现代危重性肺损伤治疗的重要组成部分。因此,本文就ω-3PUFA对ALI炎症反应及免疫功能影响的机制作一综述,旨在为临床治疗ALI提供理论依据。  相似文献   
88.
89.
目的分析颅脑创伤(TBI)开颅术后非感染性发热的原因,探讨其诊治措施。 方法收集广州医科大学附属第六医院脑外科自2016年5月至2019年7月行TBI开颅术后非感染性发热的23例患者的病例资料,对其发热原因及相应临床特点进行分析。 结果TBI开颅术后23例患者出现非感染性发热,其中吸收热3例,中枢性发热3例,植物神经功能紊乱2例,无菌性脑膜炎7例,皮下积液2例,假性囊肿1例,脑脊液漏3例,药物源性发热2例,经治疗后好转。 结论TBI开颅术后非感染性发热的原因复杂,应针对不同原因采取个体化的治疗措施。  相似文献   
90.
随着腹腔镜肝切除术在国内开展,腹腔镜肝切除术的手术适应证和手术范围在逐渐扩大,外科医生在手术操作过程中的意外和手术风险也逐渐提高。腹腔镜肝切除术中副损伤主要包括胆管损伤、术中出血、膈肌损伤、气体栓塞等。当在术中发生意外损伤时,应立即正确辨别出损伤类型,并迅速采取对应的处理策略,及时处理损伤,避免造成更严重的后果。同时,在术中合理使用吲哚菁绿(ICG)荧光染色及实时超声等辅助技术,可减少术中副损伤的发生。  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