全文获取类型
收费全文 | 1838篇 |
免费 | 123篇 |
国内免费 | 82篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 105篇 |
妇产科学 | 11篇 |
基础医学 | 121篇 |
口腔科学 | 1篇 |
临床医学 | 187篇 |
内科学 | 281篇 |
皮肤病学 | 5篇 |
神经病学 | 6篇 |
特种医学 | 13篇 |
外科学 | 49篇 |
综合类 | 333篇 |
预防医学 | 449篇 |
药学 | 201篇 |
中国医学 | 247篇 |
肿瘤学 | 33篇 |
出版年
2024年 | 2篇 |
2023年 | 21篇 |
2022年 | 52篇 |
2021年 | 64篇 |
2020年 | 77篇 |
2019年 | 47篇 |
2018年 | 60篇 |
2017年 | 50篇 |
2016年 | 70篇 |
2015年 | 84篇 |
2014年 | 184篇 |
2013年 | 142篇 |
2012年 | 168篇 |
2011年 | 159篇 |
2010年 | 153篇 |
2009年 | 96篇 |
2008年 | 96篇 |
2007年 | 80篇 |
2006年 | 65篇 |
2005年 | 53篇 |
2004年 | 51篇 |
2003年 | 42篇 |
2002年 | 18篇 |
2001年 | 24篇 |
2000年 | 18篇 |
1999年 | 15篇 |
1998年 | 12篇 |
1997年 | 16篇 |
1996年 | 11篇 |
1995年 | 14篇 |
1994年 | 8篇 |
1993年 | 14篇 |
1992年 | 13篇 |
1991年 | 7篇 |
1990年 | 5篇 |
1989年 | 6篇 |
1988年 | 7篇 |
1987年 | 5篇 |
1986年 | 5篇 |
1985年 | 9篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有2043条查询结果,搜索用时 23 毫秒
1.
2.
《Journal of infection and chemotherapy》2022,28(4):548-553
IntroductionCOVID-19 patients have been reported to have digestive symptoms with poor outcome. Ivermectin, an antiparasitic drug, has been used in COVID-19 patients. The objective of this study was to evaluate whether ivermectin has effects on gastrointestinal complications and ventilator-free days in ventilated patients with COVID-19.MethodsCOVID-19 patients who were mechanically ventilated in the ICU were included in this study. The ventilated patients who received ivermectin within 3 days after admission were assigned to the Ivermectin group, and the others were assigned to the Control group. Patients in the Ivermectin group received ivermectin 200 μg/kg via nasal tube. The incidence of gastrointestinal complications and ventilator-free days within 4 weeks from admission were evaluated as clinical outcomes using a propensity score with the inverse probability weighting method.ResultsWe included 88 patients in this study, of whom 39 patients were classified into the Ivermectin group, and 49 patients were classified into the Control group. The hazard ratio for gastrointestinal complications in the Ivermectin group as compared with the Control group was 0.221 (95% confidence interval [CI], 0.057 to 0.855; p = 0.029) in a Cox proportional-hazard regression model. The odds ratio for ventilator-free days as compared with the Control group was 1.920 (95% CI, 1.076 to 3.425; p = 0.027) in a proportional odds logistic regression model.ConclusionsIvermectin improved gastrointestinal complications and the number of ventilator-free days in severe COVID-19 patients undergoing mechanical ventilation. Prevention of gastrointestinal symptoms by SARS-Cov-2 might be associated with COVID-19 outcome. 相似文献
3.
《Journal of pediatric surgery》2023,58(5):856-861
Background/PurposeA small number of Hirschsprung disease (HD) patients develop inflammatory bowel disease (IBD)-like symptoms after pullthrough surgery. The etiology and pathophysiology of Hirschsprung-associated IBD (HD-IBD) remains unknown. This study aims to further characterize HD-IBD, to identify potential risk factors and to evaluate response to treatment in a large group of patients.MethodsRetrospective study of patients diagnosed with IBD after pullthrough surgery between 2000 and 2021 at 17 institutions. Data regarding clinical presentation and course of HD and IBD were reviewed. Effectiveness of medical therapy for IBD was recorded using a Likert scale.ResultsThere were 55 patients (78% male). 50% (n = 28) had long segment disease. Hirschsprung-associated enterocolitis (HAEC) was reported in 68% (n = 36). Ten patients (18%) had Trisomy 21. IBD was diagnosed after age 5 in 63% (n = 34). IBD presentation consisted of colonic or small bowel inflammation resembling IBD in 69% (n = 38), unexplained or persistent fistula in 18% (n = 10) and unexplained HAEC >5 years old or unresponsive to standard treatment in 13% (n = 7). Biological agents were the most effective (80%) medications. A third of patients required a surgical procedure for IBD.ConclusionMore than half of the patients were diagnosed with HD-IBD after 5 years old. Long segment disease, HAEC after pull through operation and trisomy 21 may represent risk factors for this condition. Investigation for possible IBD should be considered in children with unexplained fistulae, HAEC beyond the age of 5 or unresponsive to standard therapy, and symptoms suggestive of IBD. Biological agents were the most effective medical treatment.Level of EvidenceLevel 4 相似文献
4.
Mohid S Khan Thomas Walter Amy Buchanan-Hughes Emma Worthington Lucie Keeber Marion Feuilly Enrique Grande 《World journal of gastroenterology : WJG》2020,26(30):4537-4556
BACKGROUND Approximately 20% of patients with neuroendocrine tumours(NETs) develop carcinoid syndrome(CS),characterised by flushing and diarrhoea.Somatostatin analogues or telotristat can be used to control symptoms of CS through inhibition of serotonin secretion.Although CS is often the cause of diarrhoea among patients with gastroenteropancreatic NETs(GEP-NETs),other causes to consider include pancreatic enzyme insufficiency(PEI),bile acid malabsorption and small intestinal bacterial overgrowth.If other causes of diarrhoea unrelated to serotonin secretion are mistaken for CS diarrhoea,these treatments may be ineffective against the diarrhoea,risking detrimental effects to patient quality of life.AIM To identify and synthesise qualitative and quantitative evidence relating to the differential diagnosis of diarrhoea in patients with GEP-NETs.METHODS Electronic databases(MEDLINE,Embase and the Cochrane Library) were searched from inception to September 12,2018 using terms for NETs and diarrhoea.Congresses,systematic literature review bibliographies and included articles were also hand-searched.Any study designs and publication types were eligible for inclusion if relevant data on a cause(s) of diarrhoea in patients with GEP-NETs were reported.Studies were screened by two independent reviewers at abstract and full-text stages.Framework synthesis was adapted to synthesise quantitative and qualitative data.The definition of qualitative data was expanded to include all textual data in any section of relevant publications.RESULTS Forty-seven publications(44 studies) were included,comprising a variety of publication types,including observational studies,reviews,guidelines,case reports,interventional studies,and opinion pieces.Most reported on PEI on/after treatment with somatostatin analogs;9.5%-84% of patients with GEP-NETs had experienced steatorrhoea or confirmed PEI.Where reported,14.3%–50.7% of patients received pancreatic enzyme replacement therapy.Other causes of diarrhoea reported in patients with GEP-NETs included bile acid malabsorption(80%),small intestinal bacterial overgrowth(23.6%-62%),colitis(20%) and infection(7.1%).Diagnostic approaches included faecal elastase,breath tests,tauroselcholic(selenium-75) acid(Se HCAT) scan and stool culture,although evidence on the effectiveness or diagnostic accuracy of these approaches was limited.Assessment of patient history or diarrhoea characteristics was also reported as initial approaches for investigation.From the identified evidence,if diarrhoea is assumed to be CS diarrhoea,consequences include uncontrolled diarrhoea,malnutrition,and perceived ineffectiveness of CS treatment.Approaches for facilitating differential diagnosis of diarrhoea include improving patient and clinician awareness of non-CS causes and involvement of a multidisciplinary clinical team,including gastroenterologists.CONCLUSION Diarrhoea in GEP-NETs can be multifactorial with misdiagnosis leading to delayed patient recovery and inefficient resource use.This systematic literature review highlights gaps for further research on prevalence of non-CS diarrhoea and suitability of diagnostic approaches,to determine an effective algorithm for differential diagnosis of GEP-NET diarrhoea. 相似文献
5.
6.
《中国中医基础医学杂志》2020,(4):542-544
全国名中医、孟河医派传人单兆伟教授擅长胃肠病诊治,临证擅用《金匮要略》温经汤治疗女性肾虚型泄泻。认为温经汤的主要适应证是肝肾虚寒型的女性腹泻和(或)月经不调,肝脾肾三脏虚寒、寒凝而瘀、虚瘀相因、寒热错杂是温经汤证的病机特点,泄下清谷、脉象沉细或细涩、舌质淡黯有齿痕或瘀点是温经汤的主要应用指证。 相似文献
7.
8.
Cytochrome P450 3A4 and P-glycoprotein Activity and Assimilation of Tacrolimus in Transplant Patients with Persistent Diarrhea 总被引:2,自引:0,他引:2
Wim Lemahieu Bart Maes Kristin Verbeke Paul Rutgeerts Karel Geboes Yves Vanrenterghem 《American journal of transplantation》2005,5(6):1383-1391
Renal transplant recipients suffering from persistent diarrhea have been repeatedly reported to have increased tacrolimus (Tac) trough levels. This study aimed to explore this phenomenon in detail in 15 renal transplant recipients with diarrhea, whose immunosuppression consisted of corticosteroids, mofetil mycophenolate and Tac. Both hepatic and intestinal CYP3A4 and PGP activity, important determinants of Tac bioavailability, were assessed, together with global CYP activity and investigations for gastrointestinal infection, function and morphology. Global CYP, CYP3A4, PGP and trough/dose levels of Tac were compared with diarrhea-free controls. In addition, a pharmacokinetic study of Tac was performed in 11 patients affected by diarrhea versus 9 controls. As expected, diarrhea was associated with increased Tac trough levels. An even stronger, significant increase of dose-normalized Tac levels was observed between 90 and 360 min after Tac intake. Time to peak concentration and drug half-life, however, were not altered. In addition, a concomitant decrease (+/-50%) of intestinal PGP activity was noticed in patients with diarrhea. For global CYP, CYP3A4 and hepatic PGP activity no such differences were noted. This pattern was not influenced by the specific cause of diarrhea. These data strongly suggest that persistent diarrhea is associated with an increased oral bioavailability of Tac. 相似文献
9.
目的观察补脾泻肝法治疗腹泻型肠易激综合征的临床疗效。方法100例腹泻型肠易激综合征患者随机分为2组,治疗组60例给予白术芍药散加味,对照组40例给予丙咪嗪合替加色罗治疗。2组均4周为1个疗程,观察疗效,并于3-6个月后观察2组病例复发情况。结果治疗组治愈率为65%,总有效率为85%,6个月内复发率为20%,对照组则分别为32.5%、72.5%、55.56%,2组比较差异均有统计学意义(均P<0.05)。结论补脾泻肝法治疗腹泻型肠易激综合征优于丙咪嗪合替加色罗,疗效确切。 相似文献
10.
婴幼儿感染性腹泻是婴幼儿常见病之一,近年来在病原学方面有明显变迁,以致病性大肠杆菌感染多见,据我院儿科1989年的统计结果表明,大肠艾希氏菌和克雷伯氏菌感染明显上升,病程长,病情重,应引起重视,本文就1989年1年的婴幼儿感染性腹泻的发病机制与病原学进行了分析。 相似文献