全文获取类型
收费全文 | 9805篇 |
免费 | 607篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 68篇 |
儿科学 | 253篇 |
妇产科学 | 262篇 |
基础医学 | 1363篇 |
口腔科学 | 142篇 |
临床医学 | 760篇 |
内科学 | 2540篇 |
皮肤病学 | 120篇 |
神经病学 | 1427篇 |
特种医学 | 387篇 |
外科学 | 869篇 |
综合类 | 16篇 |
一般理论 | 3篇 |
预防医学 | 443篇 |
眼科学 | 129篇 |
药学 | 758篇 |
中国医学 | 10篇 |
肿瘤学 | 943篇 |
出版年
2024年 | 19篇 |
2023年 | 157篇 |
2022年 | 243篇 |
2021年 | 493篇 |
2020年 | 266篇 |
2019年 | 378篇 |
2018年 | 414篇 |
2017年 | 308篇 |
2016年 | 368篇 |
2015年 | 381篇 |
2014年 | 545篇 |
2013年 | 623篇 |
2012年 | 819篇 |
2011年 | 856篇 |
2010年 | 491篇 |
2009年 | 444篇 |
2008年 | 626篇 |
2007年 | 573篇 |
2006年 | 562篇 |
2005年 | 491篇 |
2004年 | 354篇 |
2003年 | 301篇 |
2002年 | 268篇 |
2001年 | 44篇 |
2000年 | 39篇 |
1999年 | 54篇 |
1998年 | 45篇 |
1997年 | 36篇 |
1996年 | 36篇 |
1995年 | 24篇 |
1994年 | 24篇 |
1993年 | 15篇 |
1992年 | 16篇 |
1991年 | 24篇 |
1990年 | 20篇 |
1989年 | 23篇 |
1988年 | 25篇 |
1987年 | 14篇 |
1986年 | 14篇 |
1985年 | 7篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 3篇 |
1981年 | 8篇 |
1980年 | 4篇 |
1979年 | 8篇 |
1978年 | 4篇 |
1977年 | 2篇 |
1967年 | 2篇 |
1966年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
141.
Massimiliano Cadamuro Simone Brivio Joachim Mertens Marta Vismara Anja Moncsek Chiara Milani Christian Fingas Maria Cristina Malerba Giorgia Nardo Luigi DallOlmo Eleonora Milani Valeria Mariotti Tommaso Stecca Marco Massani Carlo Spirli Romina Fiorotto Stefano Indraccolo Mario Strazzabosco Luca Fabris 《Journal of hepatology》2019,70(4):700-709
142.
Maria Chiara Gerardi Melissa Alexandre Fernandes Angela Tincani Laura Andreoli 《Current rheumatology reports》2018,20(10):59
Purpose of Review
This review focuses on new pathogenesis and clinical-therapeutic aspects of obstetric anti-phospholipid syndrome (ob-APS) in the last 5 years.Recent Findings
The pathogenesis of ob-APS is multifactorial, including placental infarctions, infiltration of inflammatory cells that cause acute and chronic inflammation, leading to uncontrolled inflammation and poor pregnancy outcomes. A preconception counseling and a patient-tailored treatment are fundamental to improve maternal and fetal outcomes. Thanks to conventional treatment, based on low-dose aspirin and heparin, 70% of women with ob-APS can have successful pregnancies. Women with positive anti-phospholipid antibodies (aPL) without clinical manifestations (“aPL carriers”) or with obstetric manifestation not fulfilling ob-APS criteria need to be further investigated in order to assess their best management.Summary
Great interest has been given to drugs that could interact in the pathophysiological mechanisms, such as hydroxychloroquine, statins, and eculizumab. These drugs could be considered for patients refractory to conventional therapy.143.
Metabolically controlled reperfusion in acute myocardial infarction: should the polarizing solution be given subselectively? 总被引:2,自引:0,他引:2
Angelini P Haas PC Bucciarelli Ducci C Adams S Ober J Bigley J Clubb FJ Frazier OH 《The Journal of invasive cardiology》2003,15(9):491-496
BACKGROUND: In working rat hearts, metabolic support of injured tissue enhances recovery after acute myocardial infarction. Clinical experience with a systemic "polarizing solution" supports this claim. OBJECTIVES: In a dog model of ischemia/reperfusion, we tested the feasibility of subselectively supplying adapted metabolic substrates before instituting blood reperfusion. METHODS: Thirty-five dogs underwent ligation of the proximal left anterior descending artery and collaterals for 90 minutes. The animals were randomly assigned to receive direct blood reperfusion (Group I), intracoronary glucose, insulin, and potassium (Group II), or intracoronary glucose, insulin, and potassium plus propionyl-L-carnitine (PLC) (Group III). After 30 minutes of artificial reperfusion, prograde blood flow was resumed in groups II and III. A routine necropsy was performed 3 to 5 days later. Primary endpoints were severe arrhythmias, death, markers of infarct size, and specific histologic features. RESULTS: We excluded 4 dogs for technical reasons and 2 others for preexisting cardiomyopathy. In the remaining 29 animals, large apical infarctions were documented ventriculographically during arterial ligation. One dog died of irreversible ventricular fibrillation during the initial ischemic period, and 9/28 dogs (32.1%) died during early reperfusion. Ventricular fibrillation was more common with 10% (versus 5%) dextrose concentrations and was eliminated by PLC. Irreversibly injured (versus jeopardized) areas of myocardium were more common in Group III (85.9 19.3%) than in Groups I and II (16.9 10.8%). CONCLUSION: Subselective infusion of metabolically supportive solutions during acute myocardial infarction is technically feasible. To prevent osmotic endothelial damage, the perfusate must have a low (< 5%) dextrose content. 相似文献
144.
Melloni C Alexander KP Milford-Beland S Newby LK Szczech LA Pollack CV Kirk JD Christenson RH Harrington RA Gibler WB Ohman EM Peterson ED Roe MT;Crusade Investigators 《Clinical cardiology》2008,31(3):125-129
BACKGROUND: The prognostic value of cardiac troponins (cTn) in patients with non-ST-segment elevation acute coronary syndromes (NSTE ACS) and chronic kidney disease (CKD) is debated. HYPOTHESIS: We tested the performance of cTnI and cTnT for risk stratification in patients with CKD and evaluated the prognostic significance of cTnI and cTnT elevations by their magnitude across the range of CKD severity. METHODS: We examined correlations among cTn elevation, CKD, and in-hospital mortality in 31,586 high-risk patients with NSTE ACS included in the Can Rapid Risk Stratification of Unstable Angina Patients Suppress ADverse Outcomes with Early Implementation of the American College of Cardiology/American Heart Association Guidelines initiative (CRUSADE). Cardiac tropinins I and T levels were categorized as ratios of each site's upper limit of normal (ULN) for myocardial necrosis: normal (cTn ratio < or =1 x ULN), mild (cTn ratio > 1-3 x ULN), and major (cTn ratio > 3 x ULN) elevation. Estimated glomerular filtration rate (eGFR) was calculated using the abbreviated Modification of Diet in Renal Disease equation. Stages of CKD were categorized as normal to mild (eGFR > 60 mL/min), moderate (eGFR 30-60 mL/min), or severe (eGFR < 30 mL/min). RESULTS: Mortality increased more steeply across CKD stages (2.0%-12.9%) than across cTn ratio categories (2.7%-5.4%). In normal or mild CKD, mortality was low regardless of cTn elevations. In moderate CKD, mortality increased incrementally with cTnI (3.3% versus 5.4% versus 7.4%) and cTnT (3.7% versus 5.3% versus 7.3%) elevation. Among severe CKD patients, only major cTn elevations further distinguished risk (cTnI: 10.1% versus 9.7% versus 14.6%; cTnT: 7.0% versus 5.7% versus 14.0%). CONCLUSIONS: In patients with CKD, cTnI and cTnT perform equally in differentiating short-term prognosis following NSTE ACS; however, the prognostic impact of cTn is dependent upon the degree of CKD severity. 相似文献
145.
Off‐label use of nicardipine as tocolytic and acute pulmonary oedema: a post‐marketing analysis of adverse drug reaction reports in EudraVigilance
下载免费PDF全文
![点击此处可从《Pharmacoepidemiology and drug safety》网站下载免费的PDF全文](/ch/ext_images/free.gif)
146.
Giulia Rivasi MD Matteo Bulgaresi MD Chiara Bandinelli MD Daniela Balzi BSc Francesca Tarantini PhD Silvia Tognelli MD Chiara Lorini PhD Primo Buscemi MD Lorenzo Baggiani MD Giancarlo Landini MD Andrea Ungar PhD Guglielmo Bonaccorsi MD Enrico Mossello PhD Enrico Benvenuti MD 《Journal of the American Geriatrics Society》2022,70(5):1336-1341
147.
Eberspacher Chiara Ficuccilli Fabrizio Tessieri Laura D’Andrea Vito Lauro Augusto Fralleone Lisa Mascagni Domenico 《Digestive diseases and sciences》2021,66(11):3725-3729
Digestive Diseases and Sciences - Haemorrhoids, a common ailment afflicting mostly Western patients, can produce bothersome symptoms, in particular pain, pruritus, and bleeding. There is a wide... 相似文献
148.
Zanella Isabella Zacchi Eliana Fornari Chiara Fumarola Benedetta Antoni Melania Degli Zizioli Daniela Quiros-Roldan Eugenia 《Metabolic brain disease》2022,37(5):1569-1583
Metabolic Brain Disease - Cognitive decline of aging is modulated by chronic inflammation and comorbidities. In people with HIV-infection (PWH) it may also be affected by HIV-induced inflammation,... 相似文献
149.
Valentina Pinna Valentina Lanari Paola Daniele Federica Consoli Emanuele Agolini Katia Margiotti Irene Bottillo Isabella Torrente Alessandro Bruselles Caterina Fusilli Anna Ficcadenti Sara Bargiacchi Eva Trevisson Monica Forzan Sandra Giustini Chiara Leoni Giuseppe Zampino Maria Cristina Digilio Bruno Dallapiccola Maurizio Clementi Marco Tartaglia Alessandro De Luca 《European journal of human genetics : EJHG》2015,23(8):1068-1071
Analysis of 786 NF1 mutation-positive subjects with clinical diagnosis of neurofibromatosis type 1 (NF1) allowed to identify the heterozygous c.5425C>T missense variant (p.Arg1809Cys) in six (0.7%) unrelated probands (three familial and three sporadic cases), all exhibiting a mild form of disease. Detailed clinical characterization of these subjects and other eight affected relatives showed that all individuals had multiple cafè-au-lait spots, frequently associated with skinfold freckling, but absence of discrete cutaneous or plexiform neurofibromas, Lisch nodules, typical NF1 osseous lesions or symptomatic optic gliomas. Facial features in half of the individuals were suggestive of Noonan syndrome. Our finding and revision of the literature consistently indicate that the c.5425C>T change is associated with a distinctive, mild form of NF1, providing new data with direct impact on genetic counseling and patient management. 相似文献
150.
Stefano Guzzetti Lubna Choudhury Silvia Mezzetti Chiara Cogliati Paolo G. Camici Alberto Malliani 《Annals of noninvasive electrocardiology》1996,1(4):349-353
Background: It has been hypothesized that an interaction between sympathetic nervous activity and an abnormal myocardium plays a role in the development and progression of hypertrophic cardiomyopathy (HCM). Methods: In the present study we investigated cardiac autonomic function by 24-hour spectral analysis of heart rate variability (HRV) in 18 patients with HCM, without evidence of heart failure, and 18 controls of similar age. Results: We found a significant reduction of 24 hour variance in HCM patients relative to controls (15,000 ± 9480 ms2 vs 24,720 ± 12,450 ms2 respectively; p < 0.05). Moreover, a loss of the expected day-night changes in the low frequency (LF) spectral component (expressed in normalized units), and LF/HF ratio (HF; high frequency component) were observed in HCM patients. Decreased day-night changes in LF/HF ratio were previously reported in patients with mild hypertension, uncomplicated coronary disease, and after myocardial infarction, conditions in which it seems to exist a higher than normal sympathetic activity. No significant correlations were found between HRV indices and echocardiographic standard measures of systolic and diastolic function parameters. Conclusions: These data are consistent with the presence of an alteration in neural modulation of heart period in HCM patients, noninvasively detectable by continuous 24 hour HRV analysis. 相似文献