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ADRB2 polymorphisms predict the risk of myocardial infarction and coronary artery disease Genet. Mol. Biol.
Wang,Dong-Wei; Liu,Min; Wang,Ping; Zhan,Xiang; Liu,Yu-Qing; Zhao,Luo-Sha.
Abstract Recently, the rs1042713 G > A and rs1042714 C > G polymorphisms in the beta-2 adrenergic receptor (ADRB2) gene were shown to be related to atherosclerosis diseases. Therefore, we performed a systemic meta-analysis to determine whether the two functional polymorphisms are related to the risk of myocardial infarction (MI) and coronary artery disease (CAD). We identified published studies that are relevant to our topic of interest. Seven case-control studies, with a total of 6,843 subjects, were incorporated into the current meta-analysis. Our analysis showed a higher frequency of rs1042713 G > A variant in patients with MI or CAD compared to healthy controls. A similar result was also obtained with the rs1042714 C > G variant under both...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Beta-2 adrenergic receptor; Genetic polymorphism; Myocardial infarction; Coronary artery disease; Meta-analysis.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000400433
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Carbohydrate antigen 125 predicts pulmonary congestion in patients with ST-segment elevation myocardial infarction BJMBR
Falcão,F.J.A.; Oliveira,F.R.A.; Cantarelli,F.; Cantarelli,R.; Brito-Júnior,P.; Lemos,H.; Silva,P.; Camboim,I.; Freire,M.C.; Carvalho,O.; Sobral-Filho,D.C..
Carbohydrate antigen 125 (CA125) has long been used as an ovarian cancer biomarker. However, because it is not specific for ovarian cells, CA125 could also be used to monitor congestion and inflammation in heart disease. Acute heart failure (HF) is used to identify patients with a worse prognosis in ST-segment elevation myocardial infarction (STEMI). We aimed to determine the association of CA125 with acute HF in STEMI and to compare CA125 with N-terminal pro brain natriuretic peptide (NTproBNP) with a cross-sectional study. At admission, patients were examined to define Killip class and then underwent coronary angioplasty. Blood samples, preferably taken in the hemodynamic ward, were centrifuged (1500 g for 15 min at ambient temperature) and stored at...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Acute coronary syndrome; Pulmonary edema; CA125 antigen; Natriuretric peptide; Myocardial infarction.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019001200611
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Differential effects of isoproterenol on the activity of angiotensin-converting enzyme in the rat heart and aorta BJMBR
Busatto,V.C.W.; Cunha,V.; Cicilini,M.A.; Mill,J.G..
The excessive stimulation of beta-adrenergic receptors in the heart induces myocardial hypertrophy. There are several experimental data suggesting that this hypertrophy may also depend, at least partially, on the increase of local production of angiotensin II secondary to the activation of the cardiac renin-angiotensin system. In this study we investigated the effects of isoproterenol on the activity of angiotensin-converting enzyme (ACE) in the heart and also in the aorta and plasma. Male Wistar rats weighing 250 to 305 g were treated with a dose of (±)-isoproterenol (0.3 mg kg-1 day-1, N = 8) sufficient to produce cardiac hypertrophy without deleterious effects on the pumping capacity of the heart. Control rats (N = 7) were treated with vehicle (corn...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Angiotensin-converting enzyme; Isoproterenol; Cardiac hypertrophy; Myocardial infarction; Heart failure.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000300017
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Effects of single-dose atorvastatin on interleukin-6, interferon gamma, and myocardial no-reflow in a rabbit model of acute myocardial infarction and reperfusion BJMBR
Zhao,X.J.; Liu,X.L.; He,G.X.; Xu,H.P..
The mechanisms of statins relieving the no-reflow phenomenon and the effects of single-dose statins on it are not well known. This study sought to investigate the effects of inflammation on the no-reflow phenomenon in a rabbit model of acute myocardial infarction and reperfusion (AMI/R) and to evaluate the effects of single-dose atorvastatin on inflammation and myocardial no-reflow. Twenty-four New Zealand white male rabbits (5-6 months old) were randomized to three groups of eight: a sham-operated group, an AMI/R group, and an atorvastatin-treated group (10 mg/kg). Animals in the latter two groups were subjected to 4 h of coronary occlusion followed by 2 h of reperfusion. Serum levels of interleukin (IL)-6 were measured by enzyme-linked immunosorbent...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Myocardial infarction; No-reflow phenomenon; Inflammation; Atorvastatin.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000300245
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Emodin protects H9c2 cells from hypoxia-induced injury by up-regulating miR-138 expression BJMBR
Zhang,Xuezhi; Qin,Qiaoji; Dai,Hongyan; Cai,Shanglang; Zhou,Changyong; Guan,Jun.
Myocardial infarction (MI) is a common presentation for ischemic heart disease, which is a leading cause of death. Emodin is a Chinese herbal anthraquinone used in several diseases. However, the effect of emodin in hypoxia-induced injury in cardiomyocytes has not been clearly elucidated. Our study aimed to clarify the functions of emodin in hypoxia-induced injury in rat cardiomyocytes H9c2 and explore the underlying mechanism. The effects of emodin on cell viability and apoptosis were analyzed by the Cell counting kit-8 assay and flow cytometry assay, respectively. The cell proliferation- and cell apoptosis-related proteins were detected by western blot. qRT-PCR was used to determine the relative expression of miR-138. Cell transfection was performed to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Emodin; Myocardial infarction; Hypoxia injury; MiR-138; Sirt1/AKT pathway; Wnt/β-catenin pathway.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000300603
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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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Genetic variations in circadian rhythm genes and susceptibility for myocardial infarction Genet. Mol. Biol.
Škrlec,Ivana; Milic,Jakov; Heffer,Marija; Peterlin,Borut; Wagner,Jasenka.
Abstract Disruption of endogenous circadian rhythms has been shown to increase the risk of developing myocardial infarction (MI), suggesting that circadian genes might play a role in determining disease susceptibility. We conducted a case-control study on 200 patients hospitalized due to MI and 200 healthy controls, investigating the association between MI and single nucleotide polymorphisms (SNPs) in four circadian genes (ARNTL, CLOCK, CRY2, and PER2). The variants of all four genes were chosen based on their previously reported association with cardiovascular risk factors, which have a major influence on the occurrence of myocardial infarction. Statistically significant differences, assessed through Chi-square analysis, were found in genotype...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cardiovascular diseases; Circadian rhythm; Myocardial infarction; Polymorphisms.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000300403
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HFE gene mutations in coronary atherothrombotic disease BJMBR
Calado,R.T.; Franco,R.F.; Pazin-Filho,A.; Simões,M.V.; Marin-Neto,J.A.; Zago,M.A..
Although iron can catalyze the production of free radicals involved in LDL lipid peroxidation, the contribution of iron overload to atherosclerosis remains controversial. The description of two mutations in the HFE gene (Cys282Tyr and His63Asp) related to hereditary hemochromatosis provides an opportunity to address the question of the association between iron overload and atherosclerosis. We investigated the prevalence of HFE mutations in 160 survivors of myocardial infarction with angiographically demonstrated severe coronary atherosclerotic disease, and in 160 age-, gender- and race-matched healthy control subjects. PCR amplification of genomic DNA followed by RsaI and BclI restriction enzyme digestion was used to determine the genotypes. The frequency...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hemochromatosis; HFE gene; Atherosclerosis; Myocardial infarction; Risk factor.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000300007
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IL-17A levels increase in the infarcted region of the left ventricle in a rat model of myocardial infarction Biol. Res.
Ávalos,Ana María; Apablaza,Felipe A; Quiroz,Mariana; Toledo,Viviana; Peña,Juan Pedro; Michea,Luis; Irarrazabal,Carlos E; Carrión,Flavio A; Figueroa,Fernando E.
Th17 cells, a recently described subtype of CD4+ effector lymphocytes, have been linked to cell-mediated autoimmune and inflammatory diseases as well as to cardiovascular diseases. However, the participation of IL-17A in myocardial ischemic injury has not been clearly defined. We therefore conducted the present study to evaluate IL-17A and Th17-related cytokine levels in a rat model of myocardial infarction (MI). MI was induced in male Sprague Dawley rats by coronary artery ligation. Controls were sham-operated (Sh) or non-operated (C). Blood and samples from the left ventricle (LV) were collected at weeks 1 and 4 post-MI. At week 1, MI animals exhibited increased IL-6, IL-23 and TGF-β mRNA levels with no apparent change in IL-17 mRNA or protein...
Tipo: Journal article Palavras-chave: Interleukin-17; Th17; Myocardial infarction; Cardiovascular disease.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000200012
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Incidence of heart failure in infarcted rats that die spontaneously BJMBR
Flumignan,R.L.G.; Kanashiro,R.M.; Saraiva,R.M.; Portes,L.A.; Antonio,E.L.; Ishigai,M.M.S.; Tucci,P.J.F..
The present study reports for the first time the incidence of congestive heart failure (CHF) in previously infarcted rats that died spontaneously. Previously, pulmonary (PWC) and hepatic (HWC) water contents were determined in normal rats: 14 control animals were evaluated immediately after sacrifice, 8 placed in a refrigerator for 24 h, and 10 left at room temperature for 24 h. In the infarcted group, 9 rats died before (acute) and 28 died 48 h after (chronic) myocardial infarction. Thirteen chronic animals were submitted only to autopsy (N = 13), whereas PWC and HWC were also determined in the others (N = 15). Seven rats survived 48 h and died during anesthesia. Notably, PWC differed in normal rats: ambient (75.7 ± 1.3%) < control (77.5 ± 0.7%) <...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heart failure; Myocardial infarction; Rats; Pulmonary congestion; Hepatic congestion.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006001000008
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Increased angiotensin-converting enzyme activity in the left ventricle after infarction BJMBR
An increase in angiotensin-converting enzyme (ACE) activity has been observed in the heart after myocardial infarction (MI). Since most studies have been conducted in chronically infarcted individuals exhibiting variable degrees of heart failure, the present study was designed to determine ACE activity in an earlier phase of MI, before heart failure development. MI was produced in 3-month old male Wistar rats by ligation of the anterior branches of the left coronary artery, control rats underwent sham surgery and the animals were studied 7 or 15 days later. Hemodynamic data obtained for the anesthetized animals showed normal values of arterial blood pressure and of end-diastolic pressure in the right and left ventricular cavities of MI rats. Right and left...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Angiotensin-converting enzyme; Myocardial infarction; Angiotensin II; Renin-angiotensin system.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000500018
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Lactate-upregulation of lactate oxidation complex-related genes is blunted in left ventricle of myocardial infarcted rats BJMBR
Gabriel-Costa,D.; Cunha,T.F.; Paixão,N.A.; Fortunato,R.S.; Rego-Monteiro,I.C.C.; Barreto-Chaves,M.L.M.; Brum,P.C..
Lactate modulates the expression of lactate oxidation complex (LOC)-related genes and cardiac blood flow under physiological conditions, but its modulatory role remains to be elucidated regarding pathological cardiac stress. The present study evaluated the effect of lactate on LOC-related genes expression and hemodynamics of hearts submitted to myocardial infarction (MI). Four weeks after MI or sham operation, isolated hearts of male Wistar rats were perfused for 60 min with Na+-lactate (20 mM). As expected, MI reduced cardiac contractility and relaxation with no changes in perfusion. The impaired cardiac hemodynamics were associated with increased reactive oxygen species (ROS) levels (Sham: 19.3±0.5 vs MI: 23.8±0.3 µM), NADPH oxidase (NOX) activity (Sham:...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lactate; Lactate oxidation complex; Myocardial infarction; Gene expression; Perfusion pressure; Oxidative stress.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018001100605
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Linear and nonlinear analysis of heart rate variability in healthy subjects and after acute myocardial infarction in patients BJMBR
Kunz,V.C.; Borges,E.N.; Coelho,R.C.; Gubolino,L.A.; Martins,L.E.B.; Silva,E..
The objectives of this study were to evaluate and compare the use of linear and nonlinear methods for analysis of heart rate variability (HRV) in healthy subjects and in patients after acute myocardial infarction (AMI). Heart rate (HR) was recorded for 15 min in the supine position in 10 patients with AMI taking β-blockers (aged 57 ± 9 years) and in 11 healthy subjects (aged 53 ± 4 years). HRV was analyzed in the time domain (RMSSD and RMSM), the frequency domain using low- and high-frequency bands in normalized units (nu; LFnu and HFnu) and the LF/HF ratio and approximate entropy (ApEn) were determined. There was a correlation (P < 0.05) of RMSSD, RMSM, LFnu, HFnu, and the LF/HF ratio index with the ApEn of the AMI group on the 2nd (r = 0.87, 0.65,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Myocardial infarction; Heart rate variability; Autonomic nervous system; Spectral analysis; Nonlinear dynamics.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000500011
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MicroRNA-122 regulates caspase-8 and promotes the apoptosis of mouse cardiomyocytes BJMBR
Zhang,Z.W.; Li,H.; Chen,S.S.; Li,Y.; Cui,Z.Y.; Ma,J..
Cardiomyocyte apoptosis plays key roles in the pathogenesis of heart diseases such as myocardial infarction. MicroRNAs are important regulators of gene expression, which are also involved in the regulation of cardiomyocyte apoptosis. However, cardiomyocyte apoptosis regulated by microRNA (miR)-122 is largely unexplored. The aim of this study focused on the role of miR-122 in cardiomyocyte apoptosis. Cardiomyocytes were isolated from neonatal mice and primarily cultured. MiR-122 mimic and inhibitor were transfected to cardiomyocytes and verified by qRT-PCR. Cell viability and apoptosis post-transfection were assessed by MTT assay and flow cytometry, respectively. Changes in expression of caspase-8 were quantified by qRT-PCR and western blot. Results showed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cardiomyocyte; Apoptosis; MiR-122; Caspase-8; Myocardial infarction.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000200601
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Polydatin protects H9c2 cells from hypoxia-induced injury via up-regulating long non-coding RNA DGCR5 BJMBR
Dai,Jinhua; Ma,Jianbo; Liao,Yufeng; Luo,Xianhai; Chen,Guofang.
Polydatin (PD), a monocrystalline polyphenolic drug mainly found in the roots of Polygonum cuspidatum, has various pharmacological activities. Long non-coding RNAs (lncRNA) DiGeorge syndrome critical region gene 5 (DGCR5) was found to participate in the suppression of multiple cancers. Here, we proposed to study the effect of PD on myocardial infarction (MI) by inducing DGCR5. CCK-8 assay was performed to detect the viability of H9c2 cells. Flow cytometry was utilized to test apoptosis of H9c2 cells. These results determined the optimal concentration and effect time of hypoxia as well as PD. Si-DGCR5 was transfected into cells and the expression level was determined by qRT-PCR. Western blot was utilized to evaluate the expression of apoptosis-related...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Myocardial infarction; Apoptosis; Autophagy; PI3K/AKT/mTOR pathway; MEK/ERK pathway.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019001200613
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Propranolol inhibits myocardial infarction-induced brown adipose tissue D2 activation and maintains a low thyroid hormone state in rats BJMBR
Seara,F.A.C.; Araujo,I.G.; Império,G.E.; Marassi,M.P.; Silva,A.C.M.; Mecawi,A.S.; Reis,L.C.; Olivares,E.L..
Considering the recognized role of thyroid hormones on the cardiovascular system during health and disease, we hypothesized that type 2 deiodinase (D2) activity, the main activation pathway of thyroxine (T4)-to-triiodothyronine (T3), could be an important site to modulate thyroid hormone status, which would then constitute a possible target for β-adrenergic blocking agents in a myocardial infarction (MI) model induced by left coronary occlusion in rats. Despite a sustained and dramatic fall in serum T4 concentrations (60–70%), the serum T3 concentration fell only transiently in the first week post-infarction (53%) and returned to control levels at 8 and 12 weeks after surgery compared to the Sham group (P<0.05). Brown adipose tissue (BAT) D2 activity...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Myocardial infarction; Thyroid hormone; Deiodinase; Beta-blocker; Rats.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019001000609
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Protective effects of fentanyl preconditioning on cardiomyocyte apoptosis induced by ischemia-reperfusion in rats BJMBR
Xu,Q.; Li,Q.-G.; Fan,G.-R.; Liu,Q.-H.; Mi,F.-L.; Liu,B..
We aimed to study the effect of fentanyl (Fen) preconditioning on cardiomyocyte apoptosis induced by ischemia-reperfusion (I/R) in rats. A total of 120 Sprague Dawley male rats (age: 3 months) were randomly divided into: sham operation group (S group), I/R group, normal saline I/R group (NS group), and fentanyl low, middle, and high dose groups (Fen1: 2 μg/kg; Fen2: 4 μg/kg; Fen3: 6 μg/kg). Heart rate (HR), mean arterial pressure (MAP), left ventricular developed pressure (LVDP), ±dp/dtmax, malondialdehyde (MDA), superoxide dismutase (SOD) activity, creatine phosphokinase-MB (CK-MB), and cardiac troponin-I (cTnI) were measured. Myocardial ischemic (MI) area, total apoptotic myocardial cells, and protein and mRNA expressions of B-cell lymphoma 2 (Bcl-2) and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fentanyl; Ischemia-reperfusion; Myocardial apoptosis; Myocardial infarction; Hemodynamic parameters; B-cell lymphoma 2; Bax.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000200603
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Rats with high left ventricular end-diastolic pressure can be identified by Doppler echocardiography one week after myocardial infarction BJMBR
Saraiva,R.M.; Kanashiro-Takeuchi,R.M.; Antonio,E.L.; Campos,O.; Tucci,P.J.F.; Moisés,V.A..
The severity of left ventricular (LV) dysfunction in rats with myocardial infarction (MI) varies widely. Because homogeneity in baseline parameters is essential for experimental investigations, a study was conducted to establish whether Doppler echocardiography (DE) could accurately identify animals with high LV end-diastolic pressure as a marker of LV dysfunction soon after MI. Direct measurements of LV end-diastolic pressure were made and DE was performed simultaneously 1 week after surgically induced MI (N = 16) or sham-operation (N = 17) in female Wistar rats (200 to 250 g). The ratio of peak early (E) to late (A) diastolic LV filling velocities and the ratio of E velocity to peak early (Em) diastolic myocardial velocity were the best predictors of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Heart failure; Myocardial infarction; Echocardiography; Hemodynamics.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007001100016
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Role of renin-angiotensin system in development of heart failure induced by myocardial infarction in rats Anais da ABC (AABC)
Trindade,Daniel C.; Trindade,Raquel C.; Marassi,Michelle P.; Martins,Ornélia P.P.R.; Costa-e-Sousa,Ricardo H.; Mattos,Elisabete C.; Marinho-Jr.,Alcides; Reis,Luís C.; Olivares,Emerson L..
We investigated the morphologic and functional changes of infarcted rat hearts under a paradigm of angiotensinconverting enzyme inhibition. Myocardial infarction was induced by left coronary artery ligation and a control group (SHAM) underwent sham-operation. Infarcted rats received normal drinking water with (CAP group) or without (INF group) captopril. Functional assessment was performed by electro (ECG) and echocardiogram (ECHO) just before and 21 days after surgery. The ECG of INF and CAP showed similar values and resembled healed infarct after surgery. The most outstanding differences between INF and CAP were the prevention of the increase of P-wave and attenuation both in rightward deviation of the QRS axis and Q-wave amplitude in CAP compared with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Myocardial infarction; Electrocardiogram; Echocardiogram; Renin-angiotensin system; Captopril.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000200008
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Temperature, air pollution, and mortality from myocardial infarction in São Paulo, Brazil BJMBR
Sharovsky,R.; César,L.A.M.; Ramires,J.A.F..
An increase in daily mortality from myocardial infarction has been observed in association with meteorological factors and air pollution in several cities in the world, mainly in the northern hemisphere. The objective of the present study was to analyze the independent effects of environmental variables on daily counts of death from myocardial infarction in a subtropical region in South America. We used the robust Poisson regression to investigate associations between weather (temperature, humidity and barometric pressure), air pollution (sulfur dioxide, carbon monoxide, and inhalable particulate), and the daily death counts attributed to myocardial infarction in the city of São Paulo in Brazil, where 12,007 fatal events were observed from 1996 to 1998....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Epidemiology; Myocardial infarction; Mortality; Temperature; Atmospheric pressure; Air pollution.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004001100009
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