全文获取类型
收费全文 | 904篇 |
免费 | 36篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 1篇 |
儿科学 | 12篇 |
妇产科学 | 14篇 |
基础医学 | 38篇 |
口腔科学 | 10篇 |
临床医学 | 306篇 |
内科学 | 277篇 |
皮肤病学 | 24篇 |
神经病学 | 17篇 |
外科学 | 71篇 |
综合类 | 12篇 |
一般理论 | 10篇 |
预防医学 | 92篇 |
药学 | 54篇 |
肿瘤学 | 9篇 |
出版年
2017年 | 5篇 |
2016年 | 14篇 |
2015年 | 46篇 |
2014年 | 32篇 |
2013年 | 25篇 |
2012年 | 30篇 |
2011年 | 33篇 |
2010年 | 39篇 |
2009年 | 59篇 |
2008年 | 27篇 |
2007年 | 38篇 |
2006年 | 49篇 |
2005年 | 25篇 |
2004年 | 19篇 |
2003年 | 9篇 |
2002年 | 13篇 |
2001年 | 30篇 |
2000年 | 22篇 |
1999年 | 39篇 |
1998年 | 49篇 |
1997年 | 30篇 |
1996年 | 39篇 |
1995年 | 38篇 |
1994年 | 45篇 |
1993年 | 23篇 |
1992年 | 10篇 |
1991年 | 12篇 |
1990年 | 15篇 |
1989年 | 16篇 |
1988年 | 15篇 |
1987年 | 10篇 |
1986年 | 14篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1983年 | 5篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1973年 | 2篇 |
1972年 | 3篇 |
1961年 | 2篇 |
1960年 | 3篇 |
1959年 | 3篇 |
1958年 | 3篇 |
1956年 | 2篇 |
1955年 | 2篇 |
1947年 | 2篇 |
1941年 | 2篇 |
排序方式: 共有947条查询结果,搜索用时 453 毫秒
81.
MARC BEDOSSA M.D. PHILIPPE COMMEAU M.D. CHRISTOPHE LECLERCQ M.D. BRUNO HURET M.D. JEAN FRANÇOIS MORELLE M.D. PIERRE OLIVIER BENOIT M.D. HERVÉ LE BRETON M.D. 《Journal of interventional cardiology》2000,13(4):231-235
Stenting of coronary arteries is currently used in clinical practice. The aim of this prospective registry was to assess the feasibility and the safety of stent implantation without balloon predilatation in noncomplex and noncalcifed lesions. One hundred six stents were implanted in 85 patients who underwent percutaneous coronary angioplasty (PTCA) of native vessels (n = 95) or bypass grafts (n = 11). The lesions were type A (21%) or B1 (79%). The stent was a tubular or a coil stent in 71 ± and 29% of the cases, respectively. The angiographic success rate was 94%. The maximal pressure was 12.1 ± 2.1 atm. In only 7 cases, it was not possible to cross the stenosis with the stent, necessitating retrieval of it and predilation with a balloon before stent implantation. Three dissections after stent implantation were treated by a second stent implantation. The primary success rate was 98% (no acute closure or myocardial infarction). A clinical follow-up was obtained in 98% of patients with a mean delay of 6 ± 0.5 months. Eighty-one percent of patients were asymptomatic. The target lesion revascularization rate was 9.4%. Four patients underwent a new PTCA and four patients a coronary artery bypass graft surgery. This technique of stent implantation appears to be safe with good immediate and midterm results. A prospective randomized trial comparing this technique to the standard technique of stent delivery in noncomplex lesions is currently ongoing with an intravascular ultrasound substudy. 相似文献
82.
The efficacy and viral safety of a pasteurized, immunoaffinity-purified procoagulant factor VIII protein (FVIII:C; Monoclate-P) was studied in two multicentre, prospective, open-label trials in 30 previously untreated patients, 18 with severe (< 1% FVIII:C activity), and 12 with moderate (1% to 5% FVIII:C activity) haemophilia A. Clinical assessments, performed at screening and regularly thereafter for 6 to > 24 months (maximum 34 months), showed that none of 24 assessable patients acquired illnesses consistent with monitored transfusion-transmissible diseases. No patients acquired hepatitis B surface antigen, or antibodies against hepatitis B core antigen, hepatitis C, or human immunodeficiency virus. Likewise, no patients acquired treatment-related hepatitis A antibodies or sustained elevations of alanine aminotransferase levels. The safety profile for Monoclate-P is brought about by a multi-step safety system that incorporates viral inactivation (through a combination of immunoaffinity chromatography and pasteurization) plus donor screening, plasma testing, and quality assurance. The inhibitor development rate (13% low titre, 10% high titre) was similar to that reported in the literature for other FVIII concentrates (24% to 52%). The most frequently reported adverse events were related to typical infant and childhood diseases. Monoclate-P was effective in all patients treated according to protocol, except in two, who developed inhibitors. 相似文献
83.
P. E. MORANGE S. BLANKENBERG† M. C. ALESSI C. BICKEL‡ H. J. RUPPRECHT§ R. SCHNABEL† E. LUBOS† T. MÜNZEL† D. PEETZ¶ V. NICAUD I. JUHAN-VAGUE L. TIRET FOR THE ATHEROGENE INVESTIGATORS 《Journal of thrombosis and haemostasis》2007,5(3):475-482
BACKGROUND: Tissue factor (TF) and its specific inhibitor, tissue factor pathway inhibitor (TFPI), are important contributors to the initiation of the coagulation process. OBJECTIVES: To compare plasma levels of soluble TF (sTF) and free-TFPI (f-TFPI) between patients with stable angina pectoris (SAP) and acute coronary syndrome (ACS) and to assess the impact of the two variables on long-term prognosis. PATIENTS/METHODS: Patients with SAPs (n = 1146) and acute coronary syndrome (n = 523) from the AtheroGene study were included and followed for 2.3 years. Because of the strong impact of unfractionated heparin (UFH) on f-TFPI levels, but not on sTF levels, patients having received UFH before blood drawing were excluded from the analyses on f-TFPI (n = 226). RESULTS: On admission, no significant differences in sTF levels were observed between SAP and ACS patients. By comparison to patients with stable angina, f-TFPI levels significantly increased in patients with acute unstable angina and further increased in patients presenting with non-ST-elevation myocardial infarction and ST-elevation myocardial infarction (P < 10(-4)). Among the 1669 individuals with a coronary artery disease, 56 died from a cardiovascular cause. In prospective analyses, high sTF levels were independently associated with an increased risk of cardiovascular death in individuals with ACS (fully adjusted hazard ratio associated with one quartile increase = 2.06; 95% confidence interval 1.24-3.45; P = 0.006) but not in those with SAP (hazard ratio = 1.07; 95% confidence interval 0.78-1.46; P = 0.67). In SAP and ACS patients, high f-TFPI levels were not independently associated with an increased risk of cardiovascular death. CONCLUSIONS: Plasma sTF levels were predictive of cardiovascular mortality in individuals with ACS, whereas f-TFPI levels were associated with the severity of myocardial damage on admission but were not independently related to outcome. 相似文献
84.
85.
目的探讨全麻下下胸段硬膜外阻滞对单肺通气期间肺内分流(Qs/Qt)的影响。方法术中需行单肺通气的30例择期开胸手术患者,ASAⅡ~Ⅲ,随机分为全麻组(GA组,n=15),全麻复合下胸段硬膜外组(GE组,n=15)。两组病人分别于麻醉前、双肺通气30min、单肺通气5、15、30min时采动脉血及混合静脉血,行血气分析,并计算出Qs/Qt等。结果两组患者在单肺通气后5、15、30min,Qs/Qt均增加(P<0.01),动脉氧分压(PaO2)较双肺通气时下降(P<0.01)。但在各时间点两组Qs/Qt以及PaO2无显著性差异。结论下胸段硬膜外阻滞对单肺通气期间肺内分流和动脉氧合无明显影响,可安全用于开胸单肺通气患者的麻醉。 相似文献
86.
JEAN-PIERRE Van de WALLE DEMETRAKIS PANAGIDES MARC MESSIER DECEBAL IOVESCU LAURENT FOURCADE MICHEL BORY JEAN-ETIENNE TOUZE 《Pacing and clinical electrophysiology : PACE》1998,21(3):494-498
The tilt table is a diagnostic device used to induce vagal syncope and determine etiology. Sensitivity enhancing techniques, such as the administration of isoproterenol, can be applied to children and young adults to compensate for the otherwise low sensitivity (20%-30%) observed in that population. This study describes an improved test that offers a simplified approach while decreasing the amount of time involved by up to 50%, without compromising sensitivity. This 45-minute procedure relies on sensitization with isoproterenol administered as a 2- to 8-μg bolus instead of a continuous infusion. The isoproterenol is injected at the 30th minute of a 45-minute 60° tilt test without returning the patient to the supine position. In this study, the isoproterenol bolus tilt test was found to be "positive" in 24 of 30 patients reporting unexplained syncope: 10 cases before the 30th minute (11.2 ± 8.4 min) and 14 cases after administration of 5.1 ± 1,9 μg of isoproterenol. 相似文献
87.
HENDRIK M. LEERSSEN MARC A. VOS KAREL Den DULK JOLANDA van der ZANDE MALCOLM J. BEGEMANN HEIN J. WELLENS 《Pacing and clinical electrophysiology : PACE》1994,17(11):2079-2083
After an abrupt decrease in pacing cycle length (PCL), the ventricular effective refractory period (VERP) shortens. The pacing protocol needed to determine accurate and reproducible values for the VERP during this process is elaborate and time consuming. In this study, steady-state values of VERP at 800 and 350 msec PCL and dynamic values of VERP due to an abrupt change in PCL from 800 to 350 msec were determined. This was done for 11 different dogs to test the interindividual variation and repetitively in the same dog to test the intraindividual variation. The results for steady-state and dynamic values of the VERP show a wide range for both groups. This means that accurate prediction of steady-state and dynamic values of VERP based on previous measurements is not possible. 相似文献
88.
89.
J. A. NIETO A. D. DE TUESTA P. J. MARCHENA G. TIBERIO J. A. TODOLI† A. L. SAMPERIZ‡ M. MONREAL§ FOR THE RIETE INVESTIGATORS¶ 《Journal of thrombosis and haemostasis》2005,3(4):703-709
BACKGROUND: Patients who have experienced a recent major bleeding episode are usually excluded from clinical studies of venous thromboembolism (VTE) treatment. Therefore, recommendations based on evidence from clinical trials may not be suitable for these patients. The Registro Informatizado de la Enfermedad TromboEmbolica (RIETE) is a multicenter, observational registry designed to gather and analyze data on VTE treatment practices and clinical outcomes in patients with acute VTE. OBJECTIVES: The aim of this analysis was to study outcomes of patients with VTE who had experienced recent major bleeding (< 30 days prior to VTE diagnosis). METHODS: Patients with objectively confirmed symptomatic acute VTE are consecutively enrolled into the RIETE registry. Patient characteristics, details of antithrombotic therapy, and clinical outcomes at 3 months were recorded. RESULTS: Of 6361 patients enrolled up to January 2004, 170 (2.7%) had experienced recent major bleeding: 69 (40.6%) gastrointestinal tract, 60 (35.3%) intracranial, 41 (24.1%) other. The incidences of major bleeding (4.1%) and recurrent pulmonary embolism (PE) (2.4%) were significantly higher in patients with recent major bleeding. Among them, patients with cancer had an increased incidence of major bleeding [odds ratio (OR) 10.0, 95% confidence interval (CI) 2.3, 50; P < 0.001] and fatal PE (OR 4.1, 95% CI 0.98, 17; P < 0.05). CONCLUSIONS: Patients with VTE and recent major bleeding prior to VTE diagnosis (2.7% of total enrolled patients) had poorer clinical outcomes compared with those who had not experienced recent major bleeding. In patients who had recent major bleeding prior to enrollment, those with cancer had a poorer clinical outcome than those without cancer. 相似文献
90.
GUSTAVO GLOTZ de LIMA DENIS ROY MARIO TALAJIC MARC DUBUC 《Pacing and clinical electrophysiology : PACE》1998,21(5):1152-1154
The anatomical substrate for AV nodal reentrant tachycardia (AVNRT) is well known and is due to anterograde conduction through a siow conducting pathway and retrograde conduction using a fast conducting path way. In this report, we describe a patient with AVNRT who also presented with frequent episodes of paroxysmal nonreentrant tachycardia due to the occurrence of two conducted ventricular beats for each sinus depolarization. Palpitations and arrhythmias were abolished after radiofrequency ablation of the slow pathway. 相似文献