全文获取类型
收费全文 | 11723篇 |
免费 | 566篇 |
国内免费 | 101篇 |
专业分类
耳鼻咽喉 | 44篇 |
儿科学 | 164篇 |
妇产科学 | 1844篇 |
基础医学 | 546篇 |
口腔科学 | 47篇 |
临床医学 | 1238篇 |
内科学 | 260篇 |
皮肤病学 | 130篇 |
神经病学 | 239篇 |
特种医学 | 191篇 |
外科学 | 1017篇 |
综合类 | 2906篇 |
预防医学 | 1649篇 |
眼科学 | 31篇 |
药学 | 1511篇 |
36篇 | |
中国医学 | 349篇 |
肿瘤学 | 188篇 |
出版年
2024年 | 11篇 |
2023年 | 139篇 |
2022年 | 288篇 |
2021年 | 401篇 |
2020年 | 410篇 |
2019年 | 370篇 |
2018年 | 302篇 |
2017年 | 398篇 |
2016年 | 442篇 |
2015年 | 475篇 |
2014年 | 1065篇 |
2013年 | 1050篇 |
2012年 | 963篇 |
2011年 | 993篇 |
2010年 | 784篇 |
2009年 | 698篇 |
2008年 | 489篇 |
2007年 | 493篇 |
2006年 | 503篇 |
2005年 | 392篇 |
2004年 | 298篇 |
2003年 | 240篇 |
2002年 | 189篇 |
2001年 | 164篇 |
2000年 | 137篇 |
1999年 | 109篇 |
1998年 | 62篇 |
1997年 | 47篇 |
1996年 | 37篇 |
1995年 | 71篇 |
1994年 | 34篇 |
1993年 | 34篇 |
1992年 | 37篇 |
1991年 | 28篇 |
1990年 | 24篇 |
1989年 | 26篇 |
1988年 | 26篇 |
1987年 | 10篇 |
1986年 | 22篇 |
1985年 | 26篇 |
1984年 | 23篇 |
1983年 | 21篇 |
1982年 | 16篇 |
1981年 | 13篇 |
1980年 | 5篇 |
1979年 | 4篇 |
1978年 | 7篇 |
1977年 | 3篇 |
1976年 | 4篇 |
1974年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 17 毫秒
1.
2.
目的 对生化汤加味促进剖宫产后子宫复旧的有效性与安全性进行系统评价,为其在临床应用提供循证医学证据。方法 检索中国生物医学文献数据库(CBM)、中国知网(CNKI)、万方资源数据库(WanFang)、维普期刊数据库(VIP)、Cochrane Library、PubMed、Web of Science等,检索时限为建库至2020年7月,选择生化汤加味促进剖宫产后子宫复旧的随机对照试验(RCT),采用Cochrane系统评价员手册提供的偏倚风险评估工具进行文献质量评价,应用RevMan5.3软件进行Meta分析。结果 共纳入12篇RCT文献,共计1804例剖宫产产妇;Meta分析结果显示,生化汤加味联合缩宫素组在产后第1、3、5天子宫底高度[MD = -0.75,95%CI(-1.35, -0.15),P < 0.00001;MD = -1.92,95%CI(-3.13, -0.72),P < 0.00001;MD = -1.92,95%CI(-3.79, -0.06),P < 0.00001]低于单用缩宫素组,联合用药组血性恶露时间[MD = -1.52,95%CI(-2.71,-0.34),P < 0.00001]和产后恶露持续时间[MD = -4.47,95%CI(-6.20,-2.75),P < 0.00001]均短于单用缩宫素组。结论 生化汤加味联合缩宫素与单用缩宫素比较,更能促进产后子宫复旧;不良反应少,报道的仅有4例出现轻微腹泻,安全性较高;但由于纳入文献质量较低,上述结论尚需更多的随机对照临床研究加以证实。 相似文献
3.
4.
Parent-infant bonding during the postpartum period allows babies to start establishing a relationship with their parents from birth, and it also plays an important role in child development. As the failure to building a close and positive bond is typically associated with poorer neuropsychological, behavioural, emotional, and social development from infancy to adulthood, early interventions that support parent-infant bonding seem particularly important. This review aims to determine and describe the effectiveness of interventions addressing parent-infant bonding during the postpartum period. Papers that were published between 2007 and 2017, written in English, and focused on an intervention aimed at improving postpartum parent-infant bonding were identified and assessed, concerning their eligibility for inclusion; thirteen such interventions met inclusion criteria and analysed. These studies addressed parent-infant bonding interventions, both in normative and at-risk situations, relative to both parents and their babies, and evaluated the impact of different strategies, such as educational and behavioural programs, psychosocial interventions, programs providing instruction in specific techniques, and interventions based on neurostimulation techniques. The heterogeneous methodologies employed by the various studies failed to enable us to pursue deep comparative analyses across our findings; this reflects a limitation that must be considered in further research aimed at implementing and evaluating future interventions. 相似文献
5.
Objective
To determine the association between provider training level and postplacental intrauterine device (IUD) outcomes following insertion instruction by email only.Study design
We conducted a single-center chart review of demographics, insertion and clinical outcomes within 6 months of delivery for 116 patients who underwent postplacental levonorgestrel 52?mg IUD placement from October 1, 2016, to March 31, 2017.Results
We confirmed IUD retention, removal or expulsion in 87 of 116 (75.0%) patients by 6 months after delivery. Complete expulsion or removal for malposition occurred in 20 (23.0%) patients and more frequently after vaginal than cesarean delivery (30.2% vs. 4.2%, OR 9.93 [95% CI 1.25–78.96]) and when a postgraduate year (PGY) 1 physician placed the IUD compared to a PGY 2–4 or attending physician (37.5% vs. 14.5%, OR 3.52 [95% CI 1.25–9.94]).Conclusion
Postplacental levonorgestrel 52?mg IUD expulsion rates are associated with provider training level as well as delivery route, though the individual association of each of these factors is difficult to ascertain given the high degree of collinearity between these two variables in our study. 相似文献6.
Objectives
To identify barriers to postpartum permanent contraception procedures after vaginal delivery and to explore contraceptive and reproductive outcomes of women who experience unfulfilled requests.Study design
We performed a retrospective cohort study of women requesting postpartum permanent contraception after vaginal delivery from 7/1/11 to 6/30/14 at Strong Memorial Hospital in Rochester, NY. We ascertained patient characteristics and outcomes through electronic medical records and birth certificate data search.Results
Of 189 women in our sample, 78 (41.3%) had a postpartum permanent contraception procedure. Factors associated with unfulfilled requests in adjusted analysis included BMI ≥40 (OR 3.71, 95% CI 1.46–9.48 compared to BMI <35), federal sterilization consent signed ≥36 weeks (OR 5.10, 95% CI 1.64–15.86 compared to <36 weeks) and delivery in the latter half of the week (Wednesday–Saturday) (OR 2.02, 95% CI 1.08–3.79). Documented reasons for unfulfilled permanent contraception requests included patient changing her mind related to procedural issues (21, 18.9%), invalid consent (20, 18.0%), maternal obesity (17, 15.3%), lack of operating room availability (14, 12.6%) and ambivalence about permanent contraception (5, 4.5%). Of 57 women who planned for interval permanent contraception and had institutional follow-up over the subsequent year, 14 (24.6%) had a procedure, 8 (14.0%) initiated long-acting reversible contraception, and 13 (22.8%) became pregnant.Conclusions
Fewer than half of women obtained desired postpartum permanent contraception after vaginal delivery, with logistical issues and obesity being the most common reported barriers. Health care providers should advocate for access to postpartum permanent contraception, as well as discuss prenatally the individualized probability of nonfulfillment and importance of alternative contraceptive plans.Implications
Logistical barriers and inappropriate antenatal preparation contribute to the fact that over half of women do not obtain desired postpartum permanent contraception after vaginal delivery. To respect reproductive autonomy and improve care, clinicians and other health officials should eliminate barriers to immediate postpartum permanent contraception while increasing access to alternative options. 相似文献7.
8.
BackgroundCarbetocin has been found to be superior to oxytocin in terms of need for additional uterotonics and prevention of postpartum haemorrhage at caesarean delivery. However, this is based on combined data from labouring and non-labouring parturients and it remains unclear how effective carbetocin is in the purely elective setting. The aim of this review was to compare carbetocin to oxytocin in elective caesarean delivery.MethodsMedline, Embase, CINAHL, Web of Science, and the Cochrane databases were searched for randomised controlled trials in any language. The primary outcome was need for additional uterotonics. Secondary outcomes were mean blood loss, need for blood transfusion and incidence of postpartum haemorrhage >1000 mL.ResultsNine studies with a total of 1962 patients were included. Trial sequential analysis confirmed that the information size (n=1692) had surpassed that required (n=1166) in order to demonstrate a statistically significant reduction in the use of additional uterotonics. Need for additional uterotonics was reduced by 53% with carbetocin compared to oxytocin (OR 0.47, 95% CI 0.34 to 0.64; P <0.001, I2=63.5). The number needed-to-treat was 11. The risk of bias, data heterogeneity and inconsistency in reporting bleeding outcomes made it difficult to reach definite conclusions about prevention of PPH.ConclusionsCarbetocin is associated with a reduced need for additional uterotonics when compared with oxytocin at elective caesarean delivery. Standardisation of bleeding-related outcomes in studies is necessary to facilitate synthesis of data in future analyses. 相似文献
9.
10.
《中国现代医生》2020,58(13):97-99+104
目的考察休克指数(shock index,SI)和舒张压(diastolic blood pressure,DBP)对女性产后出血的风险预测效果。方法选取2016年1月~2018年12月在我院行产检并分娩的320例产后出血孕妇作为研究组,另外选取同期进行正常分娩的健康孕妇240例作为对照组,比较两组患者的一般临床资料、血红蛋白(hemoglobin,Hb)、舒张压(diastolic blood pressure,DBP)、收缩压(systolic blood pressure,SBP)、心率(heart rate,HR)及休克指数(shock index,SI),并采用Ordinal逻辑回归分析各参数对产后出血的风险预警。结果两组患者在年龄、孕周、BMI及新生儿体重相比,差异无统计学意义(P0.05),而孕次相比,差异具有统计学意义(P0.05);与对照组产后24 h相比,研究组产后24 h患者的DBP、SBP及Hb均显著降低,而HR和SI显著升高(P0.05);与对照组产前相比,产后24 h患者的SBP、HR及SI显著降低(P0.05);与研究组产前相比,产后24 h患者的DBP、SBP、HR及Hb均显著降低,而SI显著升高,差异具有统计学意义(P0.05);Ordinal逻辑回归分析结果显示,休克指数和舒张压对产后出血具有预警作用(P0.05)。结论休克指数和舒张压可作为评估女性产后出血的风险预测指标,临床应密切监护。 相似文献