全文获取类型
收费全文 | 602篇 |
免费 | 38篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 2篇 |
儿科学 | 18篇 |
妇产科学 | 2篇 |
基础医学 | 42篇 |
口腔科学 | 20篇 |
临床医学 | 95篇 |
内科学 | 134篇 |
皮肤病学 | 19篇 |
神经病学 | 5篇 |
特种医学 | 91篇 |
外科学 | 32篇 |
综合类 | 64篇 |
预防医学 | 52篇 |
眼科学 | 2篇 |
药学 | 28篇 |
1篇 | |
中国医学 | 19篇 |
肿瘤学 | 18篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 6篇 |
2021年 | 9篇 |
2020年 | 12篇 |
2019年 | 10篇 |
2018年 | 15篇 |
2017年 | 7篇 |
2016年 | 7篇 |
2015年 | 30篇 |
2014年 | 24篇 |
2013年 | 30篇 |
2012年 | 31篇 |
2011年 | 28篇 |
2010年 | 42篇 |
2009年 | 30篇 |
2008年 | 24篇 |
2007年 | 27篇 |
2006年 | 8篇 |
2005年 | 9篇 |
2004年 | 7篇 |
2003年 | 14篇 |
2002年 | 4篇 |
2001年 | 8篇 |
1999年 | 4篇 |
1998年 | 27篇 |
1997年 | 23篇 |
1996年 | 29篇 |
1995年 | 23篇 |
1994年 | 22篇 |
1993年 | 14篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1989年 | 14篇 |
1988年 | 16篇 |
1987年 | 11篇 |
1986年 | 8篇 |
1985年 | 10篇 |
1984年 | 9篇 |
1983年 | 6篇 |
1982年 | 8篇 |
1981年 | 3篇 |
1980年 | 8篇 |
1979年 | 1篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1976年 | 7篇 |
1975年 | 3篇 |
1954年 | 1篇 |
排序方式: 共有644条查询结果,搜索用时 0 毫秒
81.
目的研究臂丛神经损伤膈神经移位术对青壮年患者早期呼吸功能的影响.方法对16例接受膈神经移位治疗的患者,在术前、术后(10 d)进行肺功能指标的比较,同时定期进行门诊随访,观察呼吸系统自觉症状程度.结果13例术后出现了不同程度的供氧不足症状,16例全部出现一侧膈肌抬高,术后第10天肺活量(VC)、肺活量预计值百分数(VC%)分别比术前减少37.98%和26.88%,两者差异有统计学意义(tvc=11.532、tvc%=0,P<0.01).其它项目如残气量(RV)较术前轻度下降,肺总量(TLC)下降值达到术前肺总量的36.49%,残气量/肺总量比值(RV/TLC%)较术前上升了4.75%,上述各指标的差值均有统计学意义.1 s用力呼气量/用力肺活量比值(FEV1/FVC)和术前比基本无改变,但其差值有统计学意义.膈神经移位右侧(10例)与左侧(6例)术前、术后肺活量比较差异有统计学意义.术后随访8个月~2年,所有患者均无明显呼吸困难和胸闷等症状.结论膈神经移位术后对青壮年患者肺容量有较大的丧失,肺通气功能减弱和小气道阻力增加,但其丧失程度在机体自身代偿耐受范围内,不会导致急剧发生的严重呼吸功能障碍.建议对右侧臂丛神经根性损伤的患者,术前进行严格的肺、心功能检查,避免发生较为严重的并发症. 相似文献
82.
小牛血去蛋白提取物对胃溃疡患者的疗效评价 总被引:2,自引:0,他引:2
目的:探讨小牛血去蛋白提取物(DCBE)对胃溃疡的治疗作用。方法:选择年龄20~70岁之间,经胃镜检查确诊为活动期胃溃疡的住院患60例。治疗组32例采用静脉滴注DCBE(800mg,qd)和法莫替丁(100mg,bid)治疗;对照组28例采用静脉滴注法莫替丁(100mg,bid)单独治疗。用药2、4wk行胃镜检查,观察自觉缓解症状、时间、愈合率和总有效率。结果:治疗组自觉症状缓解时间明显缩短;给药后2、4wk治疗组及对照组胃镜检查溃疡愈合率分别为78.1%,46.4%及84.4%,71.4%。结论:DCBE能显促进胃溃疡的愈合。 相似文献
83.
LR Caplan C-S Chung RJ Wityk TA Glass J Tapia L Pazdera H-M Chang JF Dashe CJ Chaves K Vemmos M Leary LD Dewitt MS Pessin 《JOURNAL OF CLINICAL NEUROLOGY》2005,1(1):14-30
Among 407 New England Medical Center Posterior Circulation Registry (NEMC-PCR) patients, 59% had strokes without transient ischemic attacks (TIAs), 24% had TIAs before strokes, and 16% had only posterior circulation TIAs. Embolism was the commonest stroke mechanism accounting for 40% of cases (24% cardiac origin, 14% arterial origin, 2% had potential cardiac and arterial sources). In 32%, large artery occlusive lesions caused hemodynamic brain infarction. Stroke mechanisms in the posterior and anterior circulation are very similar. Infarcts most often included the distal posterior circulation territory (rostral brainstem, superior cerebellum and occipital and temporal lobes), while the proximal (medulla and posterior inferior cerebellum) and middle (pons and anterior inferior cerebellum) territories were equally involved. Infarcts that included the distal territory were twice as common as those that included the proximal or middle territories. Most distal territory infarcts were attributable to embolism. Thirty day mortality was low (3.6%). Embolic stroke mechanism, distal territory location, and basilar artery occlusive disease conveyed the worst prognosis. 相似文献
84.
Tension pneumocephalus is an uncommon but life-threatening complication of craniotomy which requires urgent diagnosis and treatment. It most often occurs perioperatively following subsequent anaesthesia using nitrous oxide. All previously reported postoperative cases followed posterior fossa or upper spinal cord surgery. Only two cases associated with frontal craniotomy have been reported since 1972, both occurring intraoperatively. 相似文献
85.
86.
脂联素与妊娠期糖尿病巨大儿发生关系的研究 总被引:1,自引:0,他引:1
妊娠期糖尿病孕妇中巨大儿发生率明显高于正常孕妇,巨大儿是妊娠期糖尿病最多见的围产儿并发症,高血糖-高胰岛素学说是其基本的发病机制.脂联素、瘦素、肿瘤坏死因子-α、胰岛素样生长因子、成纤维细胞生长因子-Ⅱ、胰岛素抵抗等因素的参与加剧了妊娠期糖尿病,同时这些因素也与胎儿的生长发育密切相关,其以各种方式参与了巨大儿的发生.其中,脂联素可能起着重要作用.脂联素是调节胰岛素和糖代谢的关键因子,而胎儿的生长发育受胰岛素和糖代谢的影响,因此,脂联素可能是调节胎儿宫内发育的候选因子之一.胎盘组织中存在脂联素基因的表达,妊娠期糖尿病孕妇胎盘脂联素基因mRNA表达水平显著降低,表明妊娠期糖尿病孕妇内分泌环境的变化不但严重地影响着胎盘基因的表达,而且能通过影响胎盘调节干扰胎儿的生长发育. 相似文献
87.
88.
89.
BACKGROUND: Postpartum hospital stays seem likely to remain limited even under new laws which mandate that insurers cover 48-hour hospitalization after uncomplicated delivery. Clinicians, who are increasingly practicing in capitated arrangements, need better information to maximize clinical benefit to mothers and newborns using finite resources. OBJECTIVE AND INTERVENTIONS: This study's aim was to evaluate the clinical outcomes, patient perceptions, and costs of a revised model of perinatal care services. In this model, a new postpartum care center was established for routine follow-up of newborns within 48 hours after hospital discharge, educational efforts were shifted from the postpartum hospitalization to the prenatal period, and lactation consultant hours were increased. DESIGN AND PARTICIPANTS: Controlled, nonrandomized (double cohort) study that compared mothers and newborns with hospital stays of 48 hours or less during the Baseline Care (preintervention) study period (N = 344) with those under the Revised Care (postintervention) study period (N = 456). SETTING: The Hayward, California, medical center of Kaiser Permanente, a nonprofit health maintenance organization. DATA COLLECTION: Telephone interviews were attempted with all mothers 3 weeks after delivery. Data on rehospitalizations, emergency department (ED) and clinic visits, and costs during the first 14 postpartum days were collected from computerized databases and chart review. OUTCOME MEASURES: The combined clinical outcome was defined as any undesirable health event, including rehospitalization, an ED visit, or an urgent clinic visit by either the mother or newborn within the first 14 days postpartum, or breastfeeding discontinuation within the first 21 days postpartum. Maternal satisfaction and costs were also studied. RESULTS: Of 876 attempted interviews, 800 were completed (91%). Analyses were adjusted for age, race, education, parity, breastfeeding experience, and other relevant variables. Among the interviewed mother-newborn pairs, 45% in the Revised Care group experienced the combined clinical outcome, compared with 52% in the Baseline Care group. Newborns in the Revised Care group (29%) were significantly less likely to make urgent clinic visits during the first 14 days of life than those in the Baseline Care group (36%). There were no differences between groups in newborn ED visits or rehospitalizations, maternal clinical outcomes, or breastfeeding continuation. Mothers in the Revised Care group expressed higher satisfaction with the newborn's care, the amount of information they received about newborn care and breastfeeding, and the amount of help they received with breastfeeding. Planned hospital care, planned follow-up visits, and unplanned care costs decreased by $149 per delivery, while the new prenatal class and increased lactation consultant services cost $58 per delivery, for an estimated overall reduction in cost. CONCLUSIONS: We conclude that the revised model of perinatal care in this health maintenance organization medical center improved clinical outcomes and maternal satisfaction for low-risk mothers and newborns without increasing costs. 相似文献
90.