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Results 251 - 300 of 2839
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Methner C - - 2009
AIM: The endogenous autacoid bradykinin (BK) reportedly reduces myocardial infarct size when given exogenously at reperfusion. Muscarinic and opioid G-protein-coupled receptors are equally protective and have been shown to couple through a matrix metalloproteinase (MMP)-dependent transactivation of the epidermal growth factor receptor (EGFR). Here we test whether BK protects the ...
Mourouzis Iordanis - - 2009
BACKGROUND AND OBJECTIVES: We explored the effects of morphine administration during reperfusion period after an index ischaemia as well as potential molecular mechanisms underlying this response. This is of important clinical value, as morphine is used routinely in cardiovascular anaesthesia and in the emergency management of cardiac infarction. METHODS: Male ...
Oates Aris - - 2009
BACKGROUND: We previously evaluated cardioprotective effects of glucose-insulin-potassium (GIK) in a porcine ischemia-reperfusion model; our results showed less myocardial pH decrease during ischemia and reperfusion and faster normalization of ATP and glucose during reperfusion. The proposed protective mechanism was facilitation of glucose transport for myocardial metabolism. The objective of this ...
Urdaneta Felipe - - 2009
Propofol and isoflurane may be used during fast track anesthesia for off-pump bypass, where transient ischemia is common. The purpose of this study was to compare the effects of propofol vs isoflurane in a porcine model of acute coronary occlusion. Twenty five pigs were randomized to receive general anesthesia with ...
Minatoguchi Shinya - - 2009
BACKGROUND: Acarbose, an antidiabetic drug, is an alpha-glucosidase inhibitor that can inhibit glucose absorption in the intestine. A recent large-scale clinical trial, STOP-NIDDM, showed that acarbose reduces the risk of myocardial infarction. We examined whether acarbose reduces myocardial infarct size and investigated its mechanisms. METHODS AND RESULTS: Rabbits were fed ...
Sodha Neel R NR Division of Cardiothoracic Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Mass., - - 2009
Hydrogen sulfide is produced endogenously in response to myocardial ischemia and thought to be cardioprotective. The mechanism underlying this protection has yet to be fully elucidated, but it may be related to sulfide's ability to limit inflammation. This study investigates the cardioprotection provided by exogenous hydrogen sulfide and its potential ...
Vié Bruno - - 2009
The present study investigates whether 3-(R)-[3-(2-methoxyphenylthio-2-(S)-methylpropyl]amino-3,4-dihydro-2H-1,5-benzoxathiepine bromhydrate (F 15845), a new, persistent sodium current blocker, can reduce the ischemic Na(+) accumulation and exert short- and long-term cardioprotection after myocardial infarction. First, F 15845 concentration-dependently reduced veratrine-induced diastolic contracture (IC(50) = 0.14 microM) in isolated atria. Second, F 15845 from 1 ...
Patel Rajan A G RA Cardiovascular Division, Department of Medicine, University of Virginia, Charlottesville, Virginia 22908, - - 2009
This study was undertaken to determine whether the myocardial infarct-sparing effect of ATL-146e, a selective adenosine A(2A) receptor agonist, persists without a rebound effect for at least 48 h and to determine the optimal duration of ATL-146e treatment in anesthetized dogs. Reperfusion injury after myocardial infarction (MI) is associated with ...
Kang Sheng - - 2009
OBJECTIVE: To investigate the expressions of eNOS3 and Ve-cadherin at the first week of reperfused acute myocardial infarction (AMI). METHODS: 16 of mini-swines (20 to 30 Kg) were randomly assigned to the sham-operated group and the AMI group. Pathologic myocardial tissue was collected at 7-day of LAD reperfusion and assessed ...
Liang Ying - - 2009
Reperfusion arrhythmia (RA) is one of the main complications which are also an important cause of sudden cardiac death. The aim of this study was to clarify whether grape seed proanthocyanidins extracts (GSPE) were therapeutic agents against RA. The models of cardiac ischemic reperfusion injury were established in rabbits. GSPE ...
French Christopher J - - 2009
OBJECTIVES: Erythropoietin (EPO) has been thought to be capable of potentiating protection of jeopardized myocardium by reperfusion in evolving myocardial infarction. However, diversity in study design and measurements of infarct size in studies evaluating EPO has led to inconsistent results. We sought to characterize the effect of EPO on infarct ...
Salloum Fadi N - - 2009
PURPOSE: Myocardial ischemia induces cyclooxygenase 2 (COX-2) expression. We evaluated the effects of parecoxib, a COX-2 inhibitor, in 2 different mouse models of myocardial ischemia: permanent left coronary artery ligation (PI) and transient ligation (30 minutes ischemia) followed by reperfusion (I/R). METHODS: Forty adult male Institute of Cancer Research mice ...
Maden Orhan - - 2009
BACKGROUND: Elevated values of mean platelet volume (MPV) and elevated white blood cell (WBC) count are predictors of an unfavourable outcome among survivors of ST segment elevation myocardial infarction (STEMI). However, their relationship with reperfusion abnormalities is less clear. OBJECTIVE: To evaluate the value of admission MPV and WBC count ...
Pérez de Prado Armando - - 2009
INTRODUCTION: Progress in cardiovascular regenerative medicine research requires the availability of appropriate experimental animal models that are as close to humans as feasible. Our objective was to assess the validity of a porcine endovascular model of myocardial infarction and reperfusion. METHODS: Fifteen domestic pigs (Large White race) were anesthetized and ...
Rodr??guez-Sinovas Antonio - - 2009
Previous studies suggested that prolongation of acidosis during reperfusion is protective and may be an important mechanism of postconditioning protection. The aim of this study was to analyze the therapeutic value of this intervention during in vivo coronary reperfusion, and to compare it with ischemic postconditioning. Pigs were submitted to ...
Hein M - - 2009
BACKGROUND: Right ventricular (RV) function is an important determinant of survival after myocardial infarction. The efficacy of reperfusion therapy might be increased by the cardioprotective action of inotropic agents, which are used for symptomatic therapy in situations with compromised hemodynamics. Therefore, we used a porcine model of RV ischemia and ...
Jin Yong Chun - - 2009
The aim of the present study was to evaluate the protective effect of cryptotanshinone (CTS), one of active ingredients of Salvia miltiorrhiza root, on myocardial ischemia-reperfusion injury in rat due to inhibition of some inflammatory events that occur by NF-kappaB-activation during ischemia and reperfusion. Myocardial ischemia and reperfusion injury was ...
Rong Fan - - 2009
BACKGROUND AND AIMS: It remains unclear whether U50488H (a selective kappa-opioid receptor agonist) produces anti-apoptotic effect during ischemia and reperfusion (I/R). Therefore, the effect of U50488H on myocardial apoptosis was investigated in the present study. METHODS: Rats were subjected to 45min coronary artery occlusion and 180min of reperfusion. U50488H (1.5mg/kg ...
Martín Abraham - - 2009
Glucose consumption is severely depressed in the ischemic core, whereas it is maintained or even increased in penumbral regions during ischemia. Conversely, glucose utilization is severely reduced early after reperfusion in spite that glucose and oxygen are available. Experimental studies suggest that glucose hypometabolism might be an early predictor of ...
Paiva Marta M The Hatter Cardiovascular Institute, University College London Medical School, London, United - - 2009
Metformin improves cardiovascular outcomes in patients with type 2 diabetes compared with other glucose-lowering drugs. Experimental studies have shown that metformin can increase the intracellular concentration of adenosine monophosphate, which is a major determinant of the intracellular formation of adenosine. We hypothesize that metformin, given at reperfusion, can limit myocardial ...
Krieg Thomas - - 2009
AIMS: BAY 58-2667 (BAY-58) directly activates soluble guanylyl cyclase without tolerance in a nitric oxide (NO)-independent manner, and its haemodynamic effect is similar to that of nitroglycerin. We tested whether BAY-58 could make both rabbit and rat hearts resistant to infarction when given at the end of an ischaemic insult. ...
Jintapakorn Woravut - - 2010
INTRODUCTION: Varied reasons existed for not offering reperfusion therapy in ST elevation myocardial infarction and results in poor outcomes, and if related factors could be delineated, corrective measures can be attempted. METHOD: We compared variables between participants not receiving reperfusion therapy and those receiving single reperfusion therapy. Multivariate analysis examined ...
Phrommintikul Arintaya A Baker Heart Research Institute, Melbourne, Australia. - - 2010
The accurate measurement of myocardial salvage is critical to the ongoing refinement of reperfusion strategies in acute myocardial infarction (AMI). Cardiac magnetic resonance imaging (CMR) can define the area at risk in AMI by the presence of myocardial oedema, identified by high signal intensity on T(2)-weighted imaging with a short ...
Osipov Robert M - - 2009
Myocardial ischemia-reperfusion (IR) injury occurs frequently in the setting of hypercholesterolemia. We investigated the potential efficacy of a novel thrombin fragment (TP508) on IR injury in a hypercholesterolemic porcine model. Twenty-one hypercholesterolemic male Yucatan pigs underwent 60 min of mid-left anterior descending coronary artery occlusion followed by 120 min of ...
Matsubara Muneaki M Department of Surgery, University of Pennsylvania, Philadelphia, Pennsylvania 19036, - - 2011
Glucagon-like peptide-1 (GLP-1) has insulinomimetic, insulinotropic, and antiapoptotic properties that may make it a useful adjunct to reperfusion therapy for myocardial infarction (MI); however, GLP-1 has a short plasma half-life. Fusion of GLP-1 to human transferrin (GLP-1-Tf) significantly prolongs drug half-life. We tested the ability of single dose GLP-1-Tf to ...
Kaminski Karol A KA Medical University of Bialystok, Department of Cardiology, Bialystok, Poland. - - 2009
Interleukin 6 (IL-6) is a pleiotropic cytokine involved in both inflammatory reaction and myocardial response to stress. Its effects largely depend on the concentration of the soluble receptors (sIL-6R and sgp130). We investigated the production of IL-6, sIL-6R and sgp130 by the heart during ischemia and reperfusion. The levels of ...
Abdel-Rahman U - - 2009
OBJECTIVE: In clinical practice, reperfusion of ischemic myocardium usually occurs under high arterial oxygen levels. However, this might aggravate cardiac ischemia-reperfusion injury caused by excessive oxidative stress. In an experimental in vivo study, the cardioprotective role of hypoxic reoxygenation during initial reperfusion was assessed. METHODS: Twenty-one adult pigs were started ...
Kaul Sanjiv - - 2009
Percutanous interventions and pharmacological thrombolysis are the current options for treatment of acute coronary syndromes (ACS). The former is limited by its availability and the latter by its efficacy. Sonothrombolysis has been demonstrated to be effective in achieving tissue perfusion in the peripheral arteries as well as in cerebral arteries. ...
Hausenloy Derek J - - 2009
Coronary heart disease (CHD) is the leading cause of death globally. Following an acute coronary artery occlusion, timely myocardial reperfusion using either primary percutaneous coronary intervention (PCI) or thrombolytic therapy remains the most effective treatment strategy for reducing myocardial infarct size, preventing left ventricular remodelling, preserving left ventricular systolic function ...
Acikel Sadik - - 2010
Despite substantial advances in the treatment of acute myocardial infarction, ischemic cardiac injury and ventricular dysfunction may develop in patients undergoing reperfusion therapy. In the past few years, several experimental and clinical studies have investigated ways of enhancing myocardial salvage and regeneration. Although clinical evidence suggests that some treatment strategies ...
Turer Aslan T AT Division of Cardiology, Department of Medicine, Duke University Medical Center, Box 31297, Erwin Rd, Durham, NC 27710, USA. - - 2009
Human myocardial metabolism has been incompletely characterized in the setting of surgical cardioplegic arrest and ischemia/reperfusion. Furthermore, the effect of preexisting ventricular state on ischemia-induced metabolic derangements has not been established. We applied a mass spectrometry-based platform to profile 63 intermediary metabolites in serial paired peripheral arterial and coronary sinus ...
Kambe Masaru - - 2009
Sivelestat, a neutrophil elastase inhibitor, has been shown to attenuate pulmonary injury during ischemia and reperfusion by improving microcirculation and may be effective as a cardioprotective agent. Isolated rat hearts were Langendorff-perfused (constant pressure, 75 mmHg) with oxygenated Krebs-Henseleit bicarbonate buffer (KHB). The optimal sivelestat concentration at 19 micromol/l was ...
Lauten Alexander - - 2009
Acute ischemia is a well-known inductor of extracellular matrix (ECM) remodeling, which leads to the development of congestive heart failure and is associated with left ventricular dilatation. Here we investigate the timecourse of ECM processing with release of endostatin (ES) and other low-molecular-weight fragments during early ischemia-reperfusion of the heart. ...
Gross Garrett J - - 2009
Arachidonic acid is metabolized to a number of bioactive eicosanoid molecules by several enzymes, including enzymes of the COX, lipoxygenase and cytochrome P450 (CYP) monooxygenase pathways. Inhibition of the CYP omega-hydroxylase pathway, stimulation of the CYP-epoxygenase pathway and administration of exogenous epoxyeicosatrienoic acids resulted in cardioprotection in animal models of ...
Kong Wei W Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, Alabama 35294, - - 2009
Knowledge of transmural V(m) changes is important for understanding the mechanism of long-duration ventricular fibrillation (LDVF). The purpose of this study was to measure transmural V(m) changes during LDVF. V(m) was recorded optically at up to 8 transmural points separated by 1.5 mm in the left ventricle of Langendorff-perfused canine ...
Souktani Richard - - 2009
The purpose of the present study was to investigate the potential cardioprotective effects of an original approach based on the properties of the X chromosome-linked Inhibitor of Apoptosis (XIAP), the most effective endogenous inhibitor of apoptosis. For this purpose, the C-terminal part of XIAP (BIR3 and RING domains) was fused ...
Timmers Leo - - 2009
OBJECTIVES: This study sought to examine whether exenatide is capable of reducing myocardial infarct size. BACKGROUND: Exenatide is a glucagon-like peptide (GLP)-1 analogue with insulinotropic and insulinomimetic properties. Because insulin and GLP-1 have been described as reducing apoptosis, exenatide might confer cardioprotection after acute myocardial infarction (MI). METHODS: Pigs were ...
Tissier Renaud R INSERM U955, Equipe 3, 94010 Créteil cedex, - - 2009
We investigated whether rapid cooling instituted by total liquid ventilation (TLV) improves cardiac and mitochondrial function in rabbits submitted to ischaemia-reperfusion. Rabbits were chronically instrumented with a coronary artery occluder and myocardial ultrasonic crystals for assessment of segment length-shortening. Two weeks later they were re-anaesthetized and underwent either a normothermic ...
Rao Yan - - 2009
OBJECTIVE: To evaluate the protective effects of 8% emulsified isoflurane after myocardial ischemia-reperfusion injury and its mechanism in rabbits. METHODS: Twenty-four male adult New Zealand white rabbits were anesthetized with intravenous injection of 30 mg/kg pentobarbital followed by 5 mg x kg(-1) x h(-1) infusion. All rabbits were subjected to ...
Roesner Jan P - - 2009
OBJECTIVE: The fibrin-derived peptide Bbeta15-42 (also called FX06) has been shown to reduce myocardial infarct size following ischemia/reperfusion. Hemorrhagic shock (HS) followed by volume resuscitation represents a similar scenario, whereby a whole organism is vulnerable to reperfusion injury. DESIGN: We subjected male farm-bred landrace pigs ( approximately 30 kg) to ...
Smul Thorsten M - - 2009
OBJECTIVES: The authors tested the hypothesis that desflurane-induced cardioprotection depends on the timing of application and whether desflurane-induced postconditioning is mediated by nitric oxide. DESIGN: A prospective randomized vehicle-controlled study. SETTING: A university research laboratory. SUBJECTS: New Zealand White rabbits (N = 56). INTERVENTIONS: Rabbits were instrumented and subjected to ...
Wang Qi-qi - - 2009
OBJECTIVE: Cyclophosphamide has a role of decreasing high-sensitivity C-reactive protein in the treatment of autoimmune disorders. The effect of cyclophosphasmide on high-sensitivity C-reactive protein was investigated in myocardial ischemia/reperfusion rat. METHODS: Open-chest rats were submitted to 30 minutes of ischemia and followed for 3, 12, or 24 hours of reperfusion. ...
Odenstedt Jacob - - 2009
BACKGROUND: The ventricular repolarization (VR) response to short-lasting coronary occlusion has been characterized by 3-dimensional vectorcardiography during angioplasty in humans; the T-vector loop becomes distorted (increased T(avplan)) and more circular (decreased T(eigenvalue)), but these changes have not been related to ventricular arrhythmias. PURPOSE: The VR response was therefore explored in ...
Yang Zequan Z Department of Surgery, University of Virginia Health System, Charlottesville, VA 22908, USA. - - 2009
Acute hyperglycemia is independently associated with larger myocardial infarct size in both diabetic and nondiabetic patients. We hypothesized that the oxidative stress imposed by acute hyperglycemia contributes to the exacerbation of infarct size during reperfusion. C57BL/6 mice underwent 30 minutes of occlusion of the left anterior descending coronary artery followed ...
Montecucco Fabrizio - - 2009
Preventive treatment with cannabinoid agonists has been reported to reduce the infarct size in a mouse model of myocardial ischemia/reperfusion. Here we investigated the possible cardioprotective effect of selective CB(2) cannabinoid receptor activation during ischemia. We performed left coronary artery ligature in C57Bl/6 mice for 30 min, followed by 24 ...
Indrambarya Toonchai - - 2009
INTRODUCTION: Arginine vasopressin is a vasoactive drug commonly used in distributive shock states including mixed shock with a cardiac component. However, the direct effect of arginine vasopressin on the function of the ischemia/reperfusion injured heart has not been clearly elucidated. METHODS: We measured left ventricular ejection fraction using trans-thoracic echocardiography ...
Vosseler M - - 2009
BACKGROUND/AIMS: Clinical differentiation between infarcted and viable myocardium in the ischemic area at risk is controversial. We investigated the potential of contrast-enhanced cardiac magnetic resonance imaging (ceCMRI) in determining the area at risk 24 h after ischemia. METHODS: Myocardial ischemia was induced by percutaneous coronary intervention of the left anterior ...
Molina Carlos A - - 2009
Arterial recanalization and subsequent reperfusion have extensively demonstrated the ability to restore the brain function when performed shortly after acute ischemic stroke. Experimental and human studies have consistently demonstrated that early tissue reperfusion may limit ischemic tissue enlargement, leading to a reduced infarct size and favorable clinical outcome. However, arterial ...
Kristensen Jens - - 2009
Glucagon-like peptide 1 (GLP1) analogues are promising new treatment options for patients with type 2 diabetes, but may have both potentially beneficial and harmful cardiovascular effects. This may also be the case for the analogues of GLP1 for clinical use. The present study examined the effect of treatment with liraglutide, ...
Dai Wangde - - 2009
The cardioprotective effects of activation of the A(2A) adenosine receptor (A(2A)AR) on ischemia/reperfusion injury in the heart remain controversial. We investigated whether ATL 313, a new selective A(2A)AR agonist, could reduce myocardial infarct size in a rat ischemia/reperfusion model. Sprague-Dawley rats were subjected to a 40 minute occlusion of the ...
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