全文获取类型
收费全文 | 138898篇 |
免费 | 11616篇 |
国内免费 | 5852篇 |
专业分类
耳鼻咽喉 | 543篇 |
儿科学 | 2963篇 |
妇产科学 | 1237篇 |
基础医学 | 13592篇 |
口腔科学 | 1508篇 |
临床医学 | 15110篇 |
内科学 | 25356篇 |
皮肤病学 | 583篇 |
神经病学 | 10371篇 |
特种医学 | 4760篇 |
外国民族医学 | 17篇 |
外科学 | 14137篇 |
综合类 | 22705篇 |
现状与发展 | 26篇 |
一般理论 | 2篇 |
预防医学 | 15460篇 |
眼科学 | 898篇 |
药学 | 14008篇 |
143篇 | |
中国医学 | 6858篇 |
肿瘤学 | 6089篇 |
出版年
2024年 | 485篇 |
2023年 | 2716篇 |
2022年 | 4658篇 |
2021年 | 6071篇 |
2020年 | 5900篇 |
2019年 | 4795篇 |
2018年 | 4580篇 |
2017年 | 4891篇 |
2016年 | 5511篇 |
2015年 | 5174篇 |
2014年 | 9175篇 |
2013年 | 9811篇 |
2012年 | 8376篇 |
2011年 | 9108篇 |
2010年 | 7144篇 |
2009年 | 6823篇 |
2008年 | 6976篇 |
2007年 | 6755篇 |
2006年 | 6276篇 |
2005年 | 5236篇 |
2004年 | 4226篇 |
2003年 | 3725篇 |
2002年 | 3095篇 |
2001年 | 2743篇 |
2000年 | 2310篇 |
1999年 | 1941篇 |
1998年 | 1863篇 |
1997年 | 1732篇 |
1996年 | 1485篇 |
1995年 | 1348篇 |
1994年 | 1307篇 |
1993年 | 1085篇 |
1992年 | 1011篇 |
1991年 | 895篇 |
1990年 | 775篇 |
1989年 | 674篇 |
1988年 | 657篇 |
1987年 | 604篇 |
1986年 | 538篇 |
1985年 | 673篇 |
1984年 | 579篇 |
1983年 | 367篇 |
1982年 | 405篇 |
1981年 | 365篇 |
1980年 | 337篇 |
1979年 | 240篇 |
1978年 | 224篇 |
1977年 | 194篇 |
1976年 | 175篇 |
1974年 | 78篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
《The surgeon》2020,18(3):165-177
IntroductionThe liver is the most frequently damaged organ in blunt abdominal trauma. It is widely accepted that hemodynamically stable patients with low-grade liver trauma should be treated with non-operative management, however there is controversy surrounding its safety and efficacy in high-grade trauma. The purpose of this review is to investigate the role of non-operative management in patients with high-grade liver trauma.MethodsPubMed and reference lists of PubMed articles were searched to find studies that examined the efficacy of non-operative management in high-grade liver injury patients, and compare it to operative management. Non-operative management was considered successful if rescue surgery was avoided. Outcomes considered were success, mortality, and complication rates.ResultsThe electronic search revealed 2662 records, 8 of which met the inclusion criteria. All 8 studies contained results suggesting that non-operative management was safe and effective in hemodynamically stable patients with high-grade liver trauma. By combining the outcomes of the different studies, non-operative management had a high success rate of 92.4% (194/210) in high-grade liver trauma patients, which was near the overall 95.0% non-operative management success rate. Non-operative management also had mortality and complication rates of 4.6% (9/194) and 9.7% (7/72) in high-grade injury patients, respectively, compared to operative management's 17.6% (26/148) and 45.5% (5/11).ConclusionNon-operative management of liver trauma is safe and effective in hemodynamically stable patients with high-grade liver injury. It is associated with significantly lower mortality compared with operative management. More studies are required to evaluate complications of non-operative management in high-grade liver injury. 相似文献
122.
123.
采用描述性流行病研究方法,对2015—2018年某地上岗前职业禁忌证的构成和职业病危害因素分布进行统计学分析。结果显示,噪声、苯及苯系物作业和各类特殊工种的上岗前职业禁忌证检出率较高;双耳高频平均听阈N40dBHL而被列为噪声作业上岗前职业禁忌证者占56.98%。提示《职业健康监护技术规范》(GBZ188—2014)仍需完善,以最大限度地保证劳动者的职业健康。 相似文献
124.
125.
BackgroundArtificial insemination with the husband’s semen (AIH) is an economical and noninvasive method of infertility treatment. However, AIH’s pregnancy rate is much lower than in vitro fertilization (IVF) as its multiple and complex uncertainty factors. Semen quality has been one of the main factors which affect the pregnancy outcome of AIH.MethodsThe relevant parameters of 1,142 AIH cycles were retrospectively studied, including the general parameters and the semen quality parameters among clinical pregnancy, biochemical pregnancy, non-pregnancy group, age, infertility duration, infertility type, body mass index (BMI), cycle count, morphology in previously semen examination, and semen quality parameters on the day of AIH.ResultsThe statistically significant difference was only found on processed total non-forward and non-motile sperm count (N-TFMSC). The mean processed N-TFMSC in the biochemical pregnancy group was 6.37±4.27 million, significantly higher than the other two groups (vs. 4.40±3.15 million or vs. 4.48±3.60 million, P<0.05). The study was then divided into two groups according to processed N-TFMSC, Group 1 ≤5.0 million, and Group 2 >5.0 million. A statistical increase in biochemical pregnancy rate was observed when the processed N-TFMSC was >5.0 million (2.72% vs. 0.90%).ConclusionsProcessed N-TFMSC may be one of the independent factors on AIH’s outcome; it should be given equal attention the same as processed total forward motile sperm count (TFMSC). 相似文献
126.
Shinji Naganawa Rintaro Ito Hisashi Kawai Toshiaki Taoka Tadao Yoshida Michihiko Sone 《Magnetic resonance in medical sciences》2020,19(4):375
Purpose:It has been reported previously that intravenously administered gadolinium-based contrast agent (GBCA) leaks into the subarachnoid space around the cortical veins at 4 h after injection in all old people over 37 years, but not in younger people up to 37 years of age in 3D-real IR images. The purpose of this study was to investigate whether there was a strict threshold of 37 years of age for the leakage of the GBCA into the subarachnoid space.Methods:The subjects included 190 patients, that were scanned for 3D-real IR images at 4 hours after intravenous injection of GBCA as a diagnostic test for endolymphatic hydrops. The patient’s age ranged from 14 to 81 years. Two experienced neuroradiologists evaluated the images to determine whether the GBCA leakage around the cortical veins was positive or negative. Any discrepancies between the two observers were discussed and a consensus was obtained.A Mann–Whitney U test and receiver operating characteristic (ROC) curve analysis were used to compare the positive and the negative group and to set the age cut-off value for the prediction of GBCA leakage.Results:The GBCA leakage around the cortical veins was negative in 35 patients and positive in 155 patients. The average age was 33 ± 11 years in the negative group, and 55 ± 12 years in the positive group (P < 0.01). In the ROC analysis for the age and leakage of the GBCA, an area under the curve was 0.905 and the cut-off age was 37.317 years (sensitivity of 0.942 and specificity of 0.771).Conclusion:Intravenously administered GBCA leaks into the subarachnoid space around the cortical veins in most patients over 37 years of age. However, it should be noted that it can be found occasionally in patients under 37 years of age. 相似文献
127.
Amy Y. Zhang Christopher Burant Alex Z. Fu Gerald Strauss Donald R. Bodner Lee Ponsky 《Journal of psychosocial oncology》2020,38(2):210-227
AbstractPurpose: We examined underlying psychosocial processes of a behavioral treatment for urinary incontinence (UI) of prostate cancer survivors.Design: Secondary analysis of data collected from a clinical trial.Sample: Two hundred forty-four prostate cancer survivors who participated in a clinical trial of behavioral intervention to UI as intervention or control subjects.Methods: The participants had a 3-month behavioral intervention or usual care and were followed up for an additional 3?months. They were assessed at baseline, 3, and 6?months. Latent growth curve models were performed to examine trajectories of each study variable and relationships among the variables.Findings: Increasing self-efficacy and social support were significantly and independently associated with more reduction of urinary leakage frequency over time.Implications for psychosocial oncology: Providing problem-solving skills and social support, including peer support, are essential for empowering patients to reduce UI. 相似文献
128.
目的探讨扬州地区肝硬化食管静脉曲张初次出血患者诊治特点。方法回顾性分析2010年1月-2013年12月苏北人民医院消化内科收治的80例肝硬化食管静脉曲张初次出血患者病例资料。计数资料用率或构成比表示,率的比较采用χ2检验。结果由乙型肝炎导致肝硬化所引起的食管静脉曲张破裂出血所占比例最大;三腔二囊管临床运用可最大限度地挽救患者生命,为后期治疗提供时间;基础治疗包括止血、输血、抑酸、补液等,后期以硬化剂、套扎、硬化剂+套扎、手术、经颈静脉肝内门体分流术(TIPS)为主,但套扎运用最为广泛;患者出血初期各项指标变化有利于指导临床治疗,对患者预后具有良好的评估作用。结论扬州地区肝硬化引起的食管静脉曲张破裂出血病因呈现复杂交叉性,治疗方法仍需进一步完善,以达到个体化治疗水平;及时正确的救治,对提高临床疗效、降低病死率有重要意义;早期的健康体检,对疾病诊治起关键性的作用。 相似文献
129.
结直肠癌是常见的消化道肿瘤,其营养不良发生率高且严重。化疗是结直肠癌常见治疗方式之一,并与营养不良独立相关,化疗后患营养不良风险增大且营养不良进一步加重。同时,营养不良可导致患者化疗疗效差及预后不良,并增加化疗相关不良反应、影响患者生活质量及降低生存率等。营养治疗能够有效改善患者营养状况,在肿瘤综合治疗中有重要作用,且多学科团队合作是有效的营养干预模式。目前营养治疗主要包括营养咨询、口服营养补充剂、肠内营养和肠外营养等,相关指南和研究表明在营养治疗时应首选口服营养补充剂及肠内营养,仅在采用以上治疗后仍存在营养不足或无法进行肠内营养时行肠外营养。本文主要对结直肠癌患者营养状况与化疗之间关系、营养治疗的最新研究进展及相关指南进行综述,以期引起临床上对结直肠癌化疗患者营养治疗方面重视并提供参考。 相似文献
130.
ABSTRACT Tryptophan (Trp) is not only a nutrient enhancer but also has systemic effects. Trp metabolites signaling through the well-known aryl hydrocarbon receptor (AhR) constitute the interface of microbiome-gut-brain axis. However, the pathway through which Trp metabolites affect central nervous system (CNS) function have not been fully elucidated. AhR participates in a broad variety of physiological and pathological processes that also highly relevant to intestinal homeostasis and CNS diseases. Via the AhR-dependent mechanism, Trp metabolites connect bidirectional signaling between the gut microbiome and the brain, mediated via immune, metabolic, and neural (vagal) signaling mechanisms, with downstream effects on behavior and CNS function. These findings shed light on the complex Trp regulation of microbiome-gut-brain axis and add another facet to our understanding that dietary Trp is expected to be a promising noninvasive approach for alleviating systemic diseases. 相似文献