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   7898篇
  免费   698篇
  国内免费   236篇
耳鼻咽喉   141篇
儿科学   147篇
妇产科学   97篇
基础医学   575篇
口腔科学   230篇
临床医学   1579篇
内科学   688篇
皮肤病学   124篇
神经病学   1377篇
特种医学   218篇
外科学   621篇
综合类   1052篇
一般理论   1篇
预防医学   873篇
眼科学   75篇
药学   460篇
  9篇
中国医学   428篇
肿瘤学   137篇
  2024年   38篇
  2023年   208篇
  2022年   359篇
  2021年   525篇
  2020年   464篇
  2019年   429篇
  2018年   434篇
  2017年   388篇
  2016年   328篇
  2015年   304篇
  2014年   580篇
  2013年   620篇
  2012年   492篇
  2011年   546篇
  2010年   354篇
  2009年   397篇
  2008年   351篇
  2007年   330篇
  2006年   233篇
  2005年   193篇
  2004年   175篇
  2003年   157篇
  2002年   117篇
  2001年   113篇
  2000年   82篇
  1999年   70篇
  1998年   60篇
  1997年   41篇
  1996年   53篇
  1995年   44篇
  1994年   43篇
  1993年   42篇
  1992年   28篇
  1991年   29篇
  1990年   27篇
  1989年   20篇
  1988年   25篇
  1987年   22篇
  1986年   13篇
  1985年   22篇
  1984年   15篇
  1983年   11篇
  1982年   6篇
  1981年   2篇
  1980年   5篇
  1979年   10篇
  1978年   6篇
  1977年   2篇
  1976年   5篇
  1975年   12篇
排序方式: 共有8832条查询结果,搜索用时 15 毫秒
991.
林芳  徐波  王浩彦 《国际呼吸杂志》2012,32(13):961-964
目的 探讨门诊支气管哮喘(简称哮喘)患者哮喘控制情况并作临床分析.方法 238例门诊哮喘患者,采用德国Mediwiss敏筛检测系统检测血清特异性IgE抗体,根据全球哮喘防治创议(GINA)及我国哮喘防治指南推荐分级规范用药治疗(75±15)d.记录哮喘日记,复诊时填写哮喘控制测试(ACT)量表,将ACT分值≥20分定义为哮喘良好控制,ACT分值<20分定义为哮喘未控制.结果 经过3个月的规范化治疗,据ACT量表,达到良好控制率为66.81%(159/238);未控制率33.19%(79/238).哮喘未控制组中82.28%(65/79)的患者有吸烟史,79.75%(63/79)患者有饲养宠物,79.75%(63/79)的患者合并变应性鼻炎,明显高于良好控制组的14.46%(23/159),14.46%(23/159),56.60%(90/159).此外,患者的职业因素、依从性差及合并其他皮肤过敏阳性率哮喘未控制组明显高于良好控制组.对于吸人性过敏原如:猫狗毛皮屑、常见的霉菌血清特异性IgE阳性率哮喘未控制组分别为44.30%(35/79)、27.85%(22/79),明显高于哮喘良好控制组24.53%(39/159)、7.55%(12/159),但对于尘螨,两组有类似的阳性率.对于季节性过敏原:春季树花粉、秋季矮豚草蒿及葎草,未控制组血清特异性IgE阳性率分别为34.18%(27/79)、43.04%(34/79)和16.45%(13/79),哮喘良好控制组分别为18.24%(29/159)、29.56%(47/159)和6.29%(10/159).二者相比,哮喘未控制组阳性率明显高于哮喘良好控制组.结论 ACT是一种评价哮喘控制简易有效的方法,吸烟、宠物饲养、合并变应性鼻炎和依从性是其是否达到良好控制的主要因素.宠物毛皮屑、常见的霉菌以及季节性过敏原是哮喘未控制的主要变应原.  相似文献   
992.
Several complex diseases are caused by the malfunction of human metabolism, and deciphering the underlying molecular mechanisms can elucidate their aetiology. Systems biology is an integrative approach combining experimental and computational biology to identify and describe the molecular mechanisms of complex biological systems. Systems medicine has the potential to elucidate the onset and progression of complex metabolic diseases through the use of computational approaches. Advances in biotechnology have resulted in the provision of high-throughput data, which provide information about different metabolic processes. The systems medicine approach can utilize such data to reconstruct genome-scale metabolic models that can be used to study the function of specific enzymes and pathways in the context of the complete metabolic network. In this review, we outline the importance of genome-scale models in systems medicine and discuss how they may contribute towards the development of personalized medicine.  相似文献   
993.
《Diabetes & metabolism》2017,43(4):351-358
AimTo explore if efficacy and safety findings for insulin glargine 300 U/mL (Gla-300) versus insulin glargine 100 U/mL (Gla-100), observed over 6 months in insulin-naïve people with type 2 diabetes, are maintained after 12 months.MethodsEDITION 3 was a phase 3a, randomized, multicentre, open-label, parallel-group, treat-to-target study of once-daily Gla-300 versus Gla-100 (target fasting self-monitored plasma glucose, 4.4–5.6 mmol/L [80–100 mg/dL]). Participants completing the initial 6-month treatment phase continued their previously allocated basal insulin.ResultsOf 878 participants randomized, 337/439 (77%) and 314/439 (72%) assigned to Gla-300 and Gla-100, respectively, completed 12 months of treatment. Improved glycaemic control was sustained until 12 months in both treatment groups, with similar reductions in HbA1c from baseline to month 12 (difference: −0.08 [95% confidence interval (CI): −0.23 to 0.07] % or −0.9 [−2.5 to 0.8] mmol/mol). Relative risk of experiencing  1 confirmed (≤ 3.9 mmol/L [≤ 70 mg/dL]) or severe hypoglycaemic event with Gla-300 versus Gla-100 was 0.86 (95% CI: 0.69 to 1.07) at night and 0.92 (0.82 to 1.03) at any time of day. For events with a glycaemic threshold of < 3.0 mmol/L (< 54 mg/dL) these numbers were 0.76 (0.49 to 1.19) and 0.66 (0.50 to 0.88). A similar pattern was seen for documented symptomatic events. No between-group differences in adverse events were identified.ConclusionOver 12 months, Gla-300 treatment was as effective as Gla-100 in reducing HbA1c in insulin-naïve people with type 2 diabetes, with lower overall risk of hypoglycaemia at the < 3.0 mmol/L threshold.  相似文献   
994.
目的评估美沙拉嗪联合马来酸曲美布汀治疗肠易激综合征(IBS)患者的临床疗效。方法根据罗马Ⅲ诊断标准纳入2014年10月至2016年6月在上海市嘉定区中心医院就诊的腹泻型IBS(IBS-D)和便秘型IBS(IBS-C)患者各40例。40例IBS-D患者随机分为美沙拉嗪+马来酸曲美布汀组和马来酸曲美布汀组,每组各20例;40例IBS-C患者随机分为美沙拉嗪+马来酸曲美布汀组和马来酸曲美布汀组,每组各20例。同期选择20名健康体检者作为正常对照。治疗前后均使用肠易激严重程度评分系统(IBSSS)和医院焦虑抑郁量表(HADS)评估患者的临床疗效和情绪障碍的严重程度。结果研究过程中未观察到严重的药物相关不良反应。在IBS-D患者中,美沙拉嗪+马来酸曲美布汀组经过4周治疗后,IBSSS总分由基线时的(194.5±62.6)分下降至(136.3±47.2)分(P0.000 1),而马来酸曲美布汀单药组则由治疗前的(207.3±49.2)分下降至治疗后的(197.5±47.8)分(P=0.01);在IBS-C患者中,美沙拉嗪+马来酸曲美布汀组经过4周治疗后,IBSSS总分由基线时的(245.8±70.4)分下降至(231.3±65.0)分(P=0.005)。基线状态时,IBS患者组的焦虑和(或)抑郁评分均高于健康对照组(P0.000 1)。在IBS-D患者中,美沙拉嗪+马来酸曲美布汀组经过4周治疗后,焦虑和抑郁评分分别由基线时的(11.9±4.1)分下降至(11.3±4.1)分(P=0.019)、(13.6±4.7)分下降至(12.5±4.5)分(P=0.002 6)。结论美沙拉嗪联合马来酸曲美布汀治疗可改善IBS患者,尤其是IBS-D患者的临床症状和精神心理障碍。  相似文献   
995.

Background

The prevention of thromboembolism events remains challenging in cases of poor medication adherence. Unfortunately, clinical prediction of future adherence has been suboptimal. The objective of this study was to examine the correlation between 2 measures of real-time, self-reported adherence and anticoagulation control.

Methods

The IN-RANGE2 cohort recruited patients initiating warfarin therapy in 3 urban anticoagulation clinics. At each study visit, participants reported adherence using a 100-point visual analogue scale (VAS, marking percentage of pills taken since prior visit on a linear scale) and 7-day recall of pill-taking behavior. Anticoagulation control was measured by between-visit percent time in international normalized ratio range (BVTR), dichotomized at the cohort median. The longitudinal association between adherence and anticoagulation control was estimated using generalized estimating equations, controlling for clinical and demographic characteristics, prior BVTR, and warfarin dose changes.

Results

Among 598 participants with 3204 (median 4) visits, the median BVTR was 36.8% (interquartile range 0%-73.9%). Participants reported ≤80% adherence in 182 visits (5.7%) and missed pills in the past 7 days in 377 visits (11.8%). Multivariable regression analysis found poorer anticoagulation control (BVTR <36.8%) in those with a VAS ≤80% (odds ratio 1.89; 95% confidence interval, 1.12-3.18; P = .02) and self-reported change in adherence since last visit (odds ratio 1.55; 95% confidence interval, 1.20-2.01; P = .001).

Conclusion

Self-reported VAS medication adherence at a clinic visit and changes in reported adherence since the last visit are independently associated with BVTR. Clinicians may gain additional insight into patients' medication adherence by incorporating this information into patient management.  相似文献   
996.
Aim: The number of hemodialysis (HD) patients is increasing along with their mean age in Japan. The assessment of their psychosocial status and quality of life (QOL) is therefore becoming more and more important along with laboratory data or comorbidities. Methods: We examined the psychosocial status of 211 HD patients (72 elderly and 139 non‐elderly) and compared the difference between elderly and non‐elderly patients using a visual analogue scale (VAS). We then examined how QOL affected mortality rate in 3‐year prospective follow up. We assessed 10 items of QOL: health condition, appetite, sleep, mood, memory, family relationships, friendship, economical status, life satisfaction in daily life, and happiness with qualified self‐evaluating questionnaires along with laboratory data and comorbidities. Furthermore, we investigated the correlation between the scores of mood and geriatric depression scale (GDS)‐15. Results: There was no difference in VAS scores between elderly and non‐elderly patients. Lower VAS scores for appetite and mood correlated with higher mortality in HD patients, especially in the non‐elderly. VAS scores for mood correlated with GDS‐15 in HD patients. Conclusions: More attention should be paid to appetite and the diagnosis and therapy of depressive mood to improve the prognosis of HD patients, especially for the non‐elderly. Geriatr Gerontol Int 2012; 12: 65–71.  相似文献   
997.

OBJECTIVE:

To develop and validate a clinical prediction scale for hospital-onset Clostridium difficile infection (CDI).

METHODS:

A community-based, 360-bed hospital located in the suburbs of a metropolitan area in the United States served as the setting for the present retrospective cohort study. The cohort consisted of patients admitted to the adult medical service over a six-year period from October 2005 to September 2011. The cohort was divided into derivation (October 2005 to September 2009) and validation (October 2009 to September 2011) groups. The primary outcome measure was hospital-onset CDIs identified as stool positive for C difficile after 48 h of hospital admission ordered for new-onset unformed stool by the treating physician.

RESULTS:

In the derivation phase, 35,588 patients were admitted to the medical service and 21,541 stayed in hospital beyond 48 h. A total of 266 cases of CDI were identified, 121 of which were hospital onset. The developed clinical prediction scale included the onset of unformed stool (5 points), length of hospital stay beyond seven days (4 points), age >65 years (3 points), long-term care facility residence (2 points), high-risk antibiotic use (1 point) and hypoalbuminemia (1 point). The scale had an area under the receiver operating curve (AUC) of 0.93 (95% CI 0.82 to 0.94) in predicting hospital-onset CDI, with a sensitivity of 0.94 (95% CI 0.88 to 0.97) and a specificity of 0.80 (95% CI 0.79 to 0.80) at a cut-off score of 9 on the scale. During the validation phase, 16,477 patients were admitted, of whom 10,793 stayed beyond 48 h and 58 acquired CDI during hospitalization. The predictive performance of the score was maintained in the validation cohort (AUC 0.95 [95% CI 0.93 to 0.96]) and the goodness-to-fit model demonstrated good calibration.

CONCLUSION:

The authors developed and validated a simple clinical prediction scale for hospital-onset CDI. This score can be used for periodical evaluation of hospitalized patients for early initiation of contact precautions and empirical treatment once it is validated externally in a prospective manner.  相似文献   
998.
目的:探讨轻度慢性乙型肝炎(CHB)患者的中医证候分布规律,为规范化治疗CHB提供参考依据.方法:运用中医证候量表对594例轻度CHB患者进行中医证候调查,采用聚类分析的方法对纳入的患者进行聚类,并结合变量频数分析对证型归属进行判定.结果:收集的轻度CHB病例均以肝郁脾虚为主要证型,在此基础上合并有6个兼证,分别为肝郁脾虚兼湿热阴虚血瘀证型(62.80%)、肝郁脾虚兼肝肾阴虚证型(24.24%)、肝郁脾虚兼肝郁化火证型(5.05%)、肝郁脾虚兼肝胃不和证型(3.70%)、肝郁脾虚兼中气亏虚证型(2.53%)和肝郁脾虚兼瘀血阻络证型(1.68%).肝郁脾虚兼湿热阴虚血瘀证型又进一步分为5个亚型,分别为脾虚为主型(45.30%)、普通型(22.52%)、气滞为主型(17.70%)、湿热为主型(10.46%)、肾虚为主型(4.02%).结论:肝都脾虚证型为轻度CHB的基本证型.  相似文献   
999.
1000.
目的:观察天智颗粒联合丁苯酞对血管性认知障碍(VCI)患者的治疗作用。方法:VCI患者90例,随机分为联合治疗组、天智颗粒组及对照组各30例。联合治疗组给予天智颗粒与丁苯酞联合治疗,天智颗粒组仅给予天智颗粒,对照组不使用改善认知功能的药物,均治疗30d。3组患者分别在治疗前及治疗1、2月后进行蒙特利尔认知(MoCA)量表测评。结果:治疗1、2个月后,联合治疗组的MoCA评分及视空间与执行功能、注意力、延迟回忆、定向力等子项目的改善优于天智颗粒组(P<0.05)。结论:天智颗粒和丁苯酞联合治疗对VCI患者的认知功能有较好的改善作用,且对MoCA评分各主要子项目都有较好的改善作用。  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