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Registros recuperados: 9
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Bioeffects of albumin-encapsulated microbubbles and real-time myocardial contrast echocardiography in an experimental canine model BJMBR
Dourado,P.M.M.; Tsutsui,J.M.; Santos,J.M.T.; Aiello,V.D.; Mathias Jr.,W.; Ramires,A.F.; da Luz,P.L.; Chagas,A.C.P..
Myocardial contrast echocardiography has been used for assessing myocardial perfusion. Some concerns regarding its safety still remain, mainly regarding the induction of microvascular alterations. We sought to determine the bioeffects of microbubbles and real-time myocardial contrast echocardiography (RTMCE) in a closed-chest canine model. Eighteen mongrel dogs were randomly assigned to two groups. Nine were submitted to continuous intravenous infusion of perfluorocarbon-exposed sonicated dextrose albumin (PESDA) plus continuous imaging using power pulse inversion RTMCE for 180 min, associated with manually deflagrated high-mechanical index impulses. The control group consisted of 3 dogs submitted to continuous imaging using RTMCE without PESDA, 3 dogs...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microbubbles; Ultrasound; Bioeffects; Myocardial contrast echocardiography.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000600017
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Compensatory enlargement of human coronary arteries identified by magnetic resonance imaging BJMBR
Bertini,P.J.; Parga,J.R.; Chagas,A.C.P.; Rochitte,C.E.; Ávila,L.F.; Favarato,D.; Luz,P.L. da.
The aim of the present study was to evaluate the role of magnetic resonance imaging (MRI) for the non-invasive detection of coronary abnormalities and specifically the remodeling process in patients with coronary artery disease (CAD). MRI was performed in 10 control healthy subjects and 26 patients with angiographically proven CAD of the right coronary (RCA) or left anterior descending (LAD) artery; 23 patients were within two months of acute coronary syndromes, and 3 had stable angina with a positive test for ischemia. Wall thickness (WT), vessel wall area (VWA), total vessel area (TVA), and luminal area (LA) were measured. There were significant increases in WT (mean ± SEM, RCA: 2.62 ± 0.75 vs 0.53 ± 0.15 mm; LAD: 2.21 ± 0.69 vs 0.62 ± 0.24 mm) and in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coronary disease; Coronary remodeling; Magnetic resonance imaging.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000500002
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Drugs and lifestyle for the treatment and prevention of coronary artery disease: comparative analysis of the scientific basis BJMBR
da Luz,P.L.; Nishiyama,M.; Chagas,A.C.P..
In this article, we compare two strategies for atherosclerosis treatment: drugs and healthy lifestyle. Statins are the principal drugs used for the treatment of atherosclerosis. Several secondary prevention studies have demonstrated that statins can significantly reduce cardiovascular events including coronary death, the need for surgical revascularization, stroke, total mortality, as well as fatal and non-fatal myocardial infarction. These results were observed in both men and women, the elderly, smokers and non-smokers, diabetics and hypertensives. Primary prevention studies yielded similar results, although total mortality was not affected. Statins also induce atheroma regression and do not cause cancer. However, many unresolved issues remain, such as...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atherosclerosis; Statins; Lifestyle; Coronary disease; Prevention.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011001000002
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Evaluation of stunned and infarcted canine myocardium by real time myocardial contrast echocardiography BJMBR
Dourado,P.M.M.; Tsutsui,J.M.; Mathias Jr.,W.; Andrade,J.L.; da Luz,P.L.; Chagas,A.C.P..
Differentiation between stunned and infarcted myocardium in the setting of acute ischemia is challenging. Real time myocardial contrast echocardiography allows the simultaneous assessment of myocardial perfusion and function. In the present study we evaluated infarcted and stunned myocardium in an experimental model using real time myocardial contrast echocardiography. Sixteen dogs underwent 180 min of coronary occlusion followed by reperfusion (infarct model) and seven other dogs were submitted to 20 min of coronary occlusion followed by reperfusion (stunned model). Wall motion abnormality and perfusional myocardial defect areas were measured by planimetry. Risk and infarct areas were determined by tissue staining. In the infarct model, the wall motion...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Myocardial perfusion; Contrast echocardiography; Myocardial stunning; Myocardial infarction.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003001100009
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Expression of inducible nitric oxide synthase is increased in patients with heart failure due to ischemic disease BJMBR
Ferreiro,C.R.; Chagas,A.C.P.; Carvalho,M.H.C.; Dantas,A.P.; Scavone,C.; Souza,L.C.B.; Buffolo,E.; Luz,P.L. da.
The objective of the present study was to determine the relationship between nitric oxide synthases (NOS) and heart failure in cardiac tissue from patients with and without cardiac decompensation. Right atrial tissue was excised from patients with coronary artery disease (CAD) and left ventricular ejection fraction (LVEF) <35% (N = 10), and from patients with CAD and LVEF >60% (N = 10) during cardiac surgery. NOS activity was measured by the conversion of L-[H³]-arginine to L-[H³]-citrulline. Gene expression was quantified by the competitive reverse transcription-polymerase chain reaction. Both endothelial NOS (eNOS) activity and expression were significantly reduced in failing hearts compared to non-failing hearts: 0.36 ± 0.18 vs 1.51 ± 0.31 pmol...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitric oxide synthase; Left ventricle ejection fraction; Heart failure.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004000900005
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High plasma concentrations of asymmetric dimethylarginine inhibit ischemic cardioprotection in hypercholesterolemic rats BJMBR
Landim,M.B.P.; Dourado,P.M.M.; Casella-Filho,A.; Chagas,A.C.P.; da-Luz,P.L..
A low concentration of nitric oxide associated with a high concentration of asymmetric dimethylarginine (ADMA) can explain the lack of ischemic cardioprotection observed in the presence of hypercholesterolemia. The objective of the present study was to evaluate the effect of hypercholesterolemia on ischemic pre- and postconditioning and its correlation with plasma concentrations of ADMA. Male Wistar rats (6-8 weeks old) fed a 2% cholesterol diet (n = 21) for 8 weeks were compared to controls (n = 25) and were subjected to experimental myocardial infarction and reperfusion, with ischemic pre- and postconditioning. Total cholesterol and ADMA were measured in plasma before the experimental infarct and the infarct area was quantified. Weight, total cholesterol...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hypercholesterolemia; Cardiotonics; Nitric oxide; Risk factors; Asymmetric dimethylarginine.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000500454
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Hyperhomocystinemia in patients with coronary artery disease BJMBR
Faria-Neto,J.R.; Chagas,A.C.P.; Bydlowski,S.P.; Lemos Neto,P.A.; Chamone,D.A.; Ramirez,J.A.F.; da Luz,P.L..
Hyperhomocystinemia has been related to an increased risk of cardiovascular disease in several studies. The C677T polymorphism for the gene that encodes the methylenetetrahydrofolate reductase enzyme (MTHFR) and low plasma folate levels are common causes of hyperhomocystinemia. Due to differences in nutritional patterns and genetic background among different countries, we evaluated the role of hyperhomocystinemia as a coronary artery disease (CAD) risk factor in a Brazilian population. The relation between homocysteine (Hcy) and the extent of CAD, measured by an angiographic score, was determined. A total of 236 patients referred for coronary angiography for clinical reasons were included. CAD was found in 148 (62.7%) patients and 88 subjects had normal or...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hyperhomocystinemia; Homocysteine; Methylenetetrahydrofolate reductase; Atherosclerosis; Folic acid deficiency.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000400005
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IL-6 and TNF-α serum levels are associated with early death in community-acquired pneumonia patients BJMBR
Bacci,M.R.; Leme,R.C.P.; Zing,N.P.C.; Murad,N.; Adami,F.; Hinnig,P.F.; Feder,D.; Chagas,A.C.P.; Fonseca,F.L.A..
Community-acquired pneumonia (CAP) is amongst the leading causes of death worldwide. As inflammatory markers, cytokines can predict outcomes, if interpreted together with clinical data and scoring systems such as CURB-65, CRB, and Acute Physiology and Chronic Health Evaluation II (APACHE II). The aim of this study was to determine the impact of inflammatory biomarkers on the early mortality of hospitalized CAP patients. Twenty-seven CAP patients needing hospitalization were enrolled for the study and samples of interleukin-1 (IL-1) and interleukin-6 (IL-6), tumor necrosis factor alpha (TNF-α), C-reactive protein (CRP), and homocystein were collected at the time of admission (day 1) as well as on the seventh day of the treatment. There was a significant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Community acquired pneumonia; Interleukin-6; Tumor necrosis factor α; Sepsis.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000500427
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Rosuvastatin prevents myocardial necrosis in an experimental model of acute myocardial infarction BJMBR
Dourado,P.M.M.; Tsutsui,J.M.; Landim,M.B.P.; Casella Filho,A.; Galvao,T.F.G.; Aiello,V.D.; Mathias Jr.,W.; da Luz,P.L.; Chagas,A.C.P..
Dyslipidemia is related to the progression of atherosclerosis and is an important risk factor for acute coronary syndromes. Our objective was to determine the effect of rosuvastatin on myocardial necrosis in an experimental model of acute myocardial infarction (AMI). Male Wistar rats (8-10 weeks old, 250-350 g) were subjected to definitive occlusion of the left anterior descending coronary artery to cause AMI. Animals were divided into 6 groups of 8 to 11 rats per group: G1, normocholesterolemic diet; G2, normocholesterolemic diet and rosuvastatin (1 mg·kg-1·day-1) 30 days after AMI; G3, normocholesterolemic diet and rosuvastatin (1 mg·kg-1·day-1) 30 days before and after AMI; G4, hypercholesterolemic diet; G5, hypercholesterolemic diet and rosuvastatin (1...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Acute myocardial infarction; Rosuvastatin; Hypercholesterolemia; Myocardial necrosis.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000500013
Registros recuperados: 9
Primeira ... 1 ... Última
 

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