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   3640篇
  免费   234篇
  国内免费   117篇
耳鼻咽喉   9篇
儿科学   32篇
妇产科学   226篇
基础医学   290篇
口腔科学   45篇
临床医学   171篇
内科学   186篇
皮肤病学   68篇
神经病学   195篇
特种医学   47篇
外科学   234篇
综合类   395篇
预防医学   282篇
眼科学   28篇
药学   1251篇
  1篇
中国医学   304篇
肿瘤学   227篇
  2023年   27篇
  2022年   37篇
  2021年   68篇
  2020年   70篇
  2019年   70篇
  2018年   105篇
  2017年   98篇
  2016年   83篇
  2015年   89篇
  2014年   216篇
  2013年   297篇
  2012年   155篇
  2011年   214篇
  2010年   164篇
  2009年   161篇
  2008年   174篇
  2007年   197篇
  2006年   167篇
  2005年   155篇
  2004年   138篇
  2003年   112篇
  2002年   111篇
  2001年   79篇
  2000年   79篇
  1999年   60篇
  1998年   47篇
  1997年   58篇
  1996年   48篇
  1995年   53篇
  1994年   57篇
  1993年   50篇
  1992年   51篇
  1991年   46篇
  1990年   37篇
  1989年   33篇
  1988年   37篇
  1987年   38篇
  1986年   30篇
  1985年   56篇
  1984年   38篇
  1983年   24篇
  1982年   39篇
  1981年   24篇
  1980年   19篇
  1979年   19篇
  1978年   21篇
  1977年   16篇
  1975年   7篇
  1974年   6篇
  1973年   3篇
排序方式: 共有3991条查询结果,搜索用时 15 毫秒
1.
The management of patients with metastatic hormone-sensitive prostate cancer (mHSPC) has been significantly modified by the availability of innovative but expensive treatments, increasing the economic burden of prostate cancer. Here, we aimed to systematically identify and review published economic evaluations (EEs) related to the treatment of mHSPC and assess their quality. A systematic search was performed of the PubMed and Cochrane databases. Three reviewers independently selected EEs by defined inclusion and exclusion criteria. They extracted all data from each EE (general information, study population, data about the EE, interventions and comparators, and outcomes). They also assessed the quality of the selected EEs according to Drummond's checklist. Fourteen EEs published between 2016 and 2021 were eligible for the systematic review. The EEs found ADT + docetaxel to be the most cost-effective of all available treatments as a first-line strategy for mHSPC (abiraterone acetate plus prednisone, enzalutamide, and apalutamide). Five EEs showed that a simple price reduction of abiraterone acetate of 50% to 75% could change the results to render this treatment also cost-effective relative to that with docetaxel. Twelve EEs were of high quality, with a Drummond score ≥ 7. Analysis of the 14 EEs identified by our systematic review, amongst which 78.6% met high quality standards, showed that ADT + docetaxel tends to be the most cost-effective alternative for mHSPC. These results were assessed by sensitivity analysis. The data provided by this systematic review help to provide a better understanding of these treatments and the better use of healthcare resources.  相似文献   
2.

Background

There is evidence linking metformin to improved prostate cancer–related outcomes.

Patients and Methods

Twenty-five men with metastatic castration-resistant prostate cancer and prostate-specific antigen (PSA) progression while receiving treatment with abiraterone from 3 Swiss centers were included in this single-arm phase 2 trial between November 2013 and September 2016. Metformin was added to abiraterone continuously at 1000 mg twice daily in uninterrupted 4-week cycles. The primary end point was the absence of disease progression at 12 weeks (PFS12). The Fleming single-stage design was applied. With a 5% significance level and 80% power, 25 patients were required to test PFS12 ≤ 15% (H0) compared to ≥ 35% (H1). Secondary end points included toxicity and safety issues. The study was registered at ClinicalTrials.gov (NCT01677897).

Results

The primary end point PFS12 was 12% (3 of 25 patients) (95% confidence interval, 3-31). Most patients had PSA progression, almost half had radiographic progression, but only 1 patient had symptomatic progression. Eleven (44%) of 25 patients had grade 1 and 2 patients each grade 2 (8%) or grade 3 (8%) gastrointestinal toxicity (nausea, diarrhea, loss of appetite). One patient discontinued treatment at week 5 because of intolerable grade 3 diarrhea.

Conclusion

The addition of metformin to abiraterone for patients with metastatic castration-resistant prostate cancer and PSA progression while receiving abiraterone therapy does not affect further progression and has no meaningful clinical benefit. A higher-than-expected gastrointestinal toxicity attributed to metformin was observed.  相似文献   
3.
《药学学报(英文版)》2020,10(2):327-343
Our recent studies demonstrated that the natural product nobiletin (NOB) served as a promising multidrug resistance (MDR) reversal agent and improved the effectiveness of cancer chemotherapy in vitro. However, low aqueous solubility and difficulty in total synthesis limited its application as a therapeutic agent. To tackle these challenges, NOB was synthesized in a high yield by a concise route of six steps and fourteen derivatives were synthesized with remarkable solubility and efficacy. All the compounds showed improved sensitivity to paclitaxel (PTX) in P-glycoprotein (P-gp) overexpressing MDR cancer cells. Among them, compound 29d exhibited water solubility 280-fold higher than NOB. A drug-resistance A549/T xenograft model showed that 29d, at a dose of 50 mg/kg co-administered with PTX (15 mg/kg), inhibited tumor growth more effective than NOB and remarkably increased PTX concentration in the tumors via P-gp inhibition. Moreover, Western blot experiments revealed that 29d inhibited expression of NRF2, phosphorylated ERK and AKT in MDR cancer cells, thus implying 29d of multiple mechanisms to reverse MDR in lung cancer.  相似文献   
4.
ObjectiveIdentify factors associated with healthcare providers' frequency of depot medroxyprogesterone acetate (DMPA) provision to adolescents.Study designWe analyzed data from surveys mailed to a nationally representative sample of public-sector providers and office-based physicians (n=1984). We estimated adjusted odds ratios (aORs) and 95% confidence intervals (CIs) of factors associated with frequent DMPA provision to adolescents in the past year.ResultsAlthough most providers (>95%) considered DMPA safe for adolescents, fewer reported frequent provision (89% of public-sector providers; 64% of office-based physicians). Among public-sector providers, factors associated with lower odds of frequent provision included working in settings without Title X funding (aOR 0.44, 95% CI 0.30–0.64), reporting primary care as their primary clinical focus versus reproductive or adolescent health (aOR 0.42, 95% CI 0.28–0.61), and providing fewer patients with family planning services. Among office-based physicians, factors associated with lower odds of frequent provision included specializing in obstetrics/gynecology (aOR 0.50, 95% CI 0.27–0.91) and family medicine (aOR 0.21, 95% CI 0.09–0.47) versus adolescent medicine, completing training ≥15 versus <5 years ago (aOR 0.27, 95% CI 0.09–0.83), and reporting that 0–24% of patients pay with Medicaid or other government healthcare assistance versus ≥50% (aOR 0.23, 95% CI 0.09–0.61). The reason most commonly reported by providers for infrequent DMPA provision was patient preference for another method.ConclusionsWhile most providers reported frequently providing DMPA to adolescents, training on evidence-based recommendations for contraception, focused on subgroups of providers with lower odds of frequent DMPA provision, may increase adolescents' access to contraception.ImplicationsAlthough >95% of providers considered depot medroxyprogesterone (DMPA) a safe contraceptive for adolescents, only 89% of public-sector providers and 64% of office-based physicians reported frequently providing DMPA to adolescents. Provider training on evidence-based recommendations for contraception counseling and provision may increase adolescents' access to DMPA and all methods of contraception.  相似文献   
5.

Objectives

The primary objective of this study was to compare the 12-month continuation rate for women who self-injected subcutaneous depot-medroxyprogesterone acetate (DMPA-SC) with that for women receiving intramuscular depot-medroxyprogesterone acetate (DMPA-IM) from a provider. This research contributes to the broader goal of identifying solutions to support women to use contraception for their full desired duration.

Study design

Participants were clients from 13 clinics in the Dakar and Thiés regions of Senegal who had decided to use injectable contraception prior to enrollment. They chose self-injection of DMPA-SC or provider administration of DMPA-IM. Self-injectors were trained and given three units of DMPA-SC. The provider-injected group received DMPA-IM and returned to the clinics for future injections. We interviewed participants at baseline and after the second, third and fourth injections (the equivalent of 12?months of contraceptive coverage). We employed Kaplan–Meier methods to estimate continuation probabilities, with a log-rank test to compare differences between groups. A multivariate Cox regression identified factors correlated with discontinuation.

Results

The 12-month continuation rate for 650 women self-injecting DMPA-SC was 80.2%, while that for 649 women receiving DMPA-IM from a provider was 70.4% (p<.01). The difference in continuation between self-injectors and those receiving DMPA from a provider remained significant in a multivariate Cox regression model. The primary reason for discontinuation in both groups (44.7% self-injected; 44.5% provider-injected) was forgetting to reinject or reinjecting late. Fewer women reported side effects in the self-injection group than in the provider-administered group.

Conclusions

The higher 12-month continuation rate for women self-injecting DMPA-SC relative to provider-administered DMPA-IM suggests that self-injection may help prevent pregnancy more consistently and continuously.

Implications

Discontinuation of injectable contraception among women wishing to avoid pregnancy may increase unmet need in francophone West Africa. This study showed higher 12-month continuation rates for women who self-injected DMPA-SC, suggesting that this delivery method may improve injectable continuation.  相似文献   
6.
IntroductionEslicarbazepine acetate (ESL), together with carbamazepine and oxcarbazepine, belongs to the dibenzazepine family. According to the latest clinical practice guidelines, tricyclic antidepressants, dual antidepressants (venlafaxine, duloxetine), and some antiepileptics (gabapentin, pregabalin) are first-line drugs for neuropathic pain; tramadol, lidocaine 5% patches, and capsaicin 8% patches are considered second-line drugs; and strong opioids constitute a third line of treatment. Such other antiepileptics as lamotrigine and lacosamide are not authorised as treatments for neuropathic pain by the regulatory agencies, but are nonetheless prescribed off-label in routine clinical practice. Carbamazepine, on the other hand, is indicated for trigeminal and glossopharyngeal neuralgia.DevelopmentWe conducted a literature search to gather evidence on the use of ESL for neuropathic pain, headache, and cranial neuralgia.ConclusionsEvidence is insufficient to recommend ESL for neuropathic pain, headache, and cranial neuralgia. Most of the available evidence comes from open and observational studies with small sample sizes and no control group; however, their favourable results call for further studies on the usefulness of ESL for neuropathic pain, headache, and cranial neuralgia.  相似文献   
7.
Dialkylcarbamoylchloride (DACC)‐coated cotton acetate dressing works directly through hydrophobic interaction to reduce the number of bacteria without the risk of resistance. It is easy to use and therefore expected to improve patient's compliance. This study aimed to assess the clinical efficacy of DACC‐coated cotton acetate dressing compared to a combination of normal saline dressing and 2% mupirocin ointment. A single‐blind controlled trial was conducted and included 14 infected epidermolysis bullosa (EB) wounds which were divided into two groups. Group I received DACC‐coated cotton acetate dressing, and Group II received the combination of normal saline dressing and 2% mupirocin ointment. Study results showed that the average time required for complete wound closure was 8.6 and 11.1 days in Groups I and II, respectively (p = .014), which was statistically significant. Both groups showed complete bacterial elimination on Day 3 based on negative Gram stain results and on Day 6 based on clearance of clinical manifestations (p = 1.000). This is a novel study in EB‐infected wounds, which shows that DACC‐coated cotton acetate dressing promotes faster wound closure and is as effective as the combination of normal saline dressing and 2% mupirocin ointment in eliminating bacterial infection.  相似文献   
8.
邵影 《中国民康医学》2021,(5):10-11,14
目的:观察纤维支气管镜灌洗联合常规药物治疗变应性支气管肺曲霉病(ABPA)患者的效果。方法:选取94例ABPA患者作为研究对象,按照随机数字表法分为观察组和对照组各47例。对照组采取常规药物治疗,观察组在对照组的基础上联合纤维支气管镜灌洗治疗。比较两组临床疗效和不良反应发生率。结果:观察组治疗总有效率为89.36%(42/47),明显高于对照组的72.34%(34/47),差异有统计学意义(P<0.05);两组不良反应发生率比较,差异无统计学意义(P>0.05)。结论:纤维支气管镜灌洗联合常规药物治疗ABPA患者的效果优于单纯常规药物治疗,且安全性好。  相似文献   
9.
10.
张娟  周生碧  张杰 《现代肿瘤医学》2020,(15):2689-2692
目的:研究术前给予醋酸亮丙瑞林对子宫肌瘤腹腔镜剔除术手术效果影响。方法:研究对象选取我院2012年10月到2017年10月间行子宫肌瘤腹腔镜剔除术患者120例,采用随机数字法将其分为对照组和观察组,每组各60例。对照组患者仅行子宫肌瘤腹腔镜剔除术治疗,观察组患者子宫肌瘤腹腔镜剔除术前,皮下注射醋酸亮丙瑞林预处理。比较两组患者的手术和术后效果指标,同时比较观察组患者治疗前后的血清黄体生成素、卵泡刺激素、雌二醇水平和月经量、子宫体积、肌瘤体积等。结果:观察组患者的术中出血量、盆腔引流量、首次下床活动时间、住院时间均明显低于对照组(P<0.01),观察组患者治疗后的血清黄体生成素、卵泡刺激素、雌二醇水平均明显低于治疗前(P<0.01),月经量、子宫体积、肌瘤体积均明显低于治疗前(P<0.01)。结论:子宫肌瘤腹腔镜剔除术术前给予醋酸亮丙瑞林治疗,能够有效调节患者激素水平和月经量,缩小子宫肌瘤体积,提高术前准备质量,有助于患者手术开展和术后恢复,值得在临床推广。  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