Active clinical trials for "Myocardial Infarction"

Platelets play a key role in the athero-thrombotic process. However, the in vivo mechanism accounting for thrombus growth at site of coronary atherosclerotic lesion has not been fully elucidated. While platelet adhesion and aggregation on the thrombogenic core of atherosclerotic plaque is an established mechanism for thrombus growth, the role of systemic factors, which may contribute to thrombus via amplification and propagation of platelet aggregation, is still to be clarified. There is a growing body of evidence that lipopolysaccharides (LPS), are implicated in athero-thrombosis. Circulating levels of endotoxins have been associated with human atherosclerosis progression, particularly in smokers or in patients with infections. Furthermore, endotoxins seem to be implicated in the thrombotic process through several mechanisms including up-regulation of macrophage tissue factor expression and amplification of platelet response upon interaction with Toll-like receptor 4. The relationship between endotoxins and platelets may be relevant in the context of acute coronary syndromes as endotoxins could locally amplify platelet-derived thrombus growth but this issue is still unexplored. Previous studies demonstrated that low-grade endotoxemia is detectable in human circulation, likely as consequence of enhanced gut permeability, and may be responsible for leucocyte-platelet aggregate and eventually thrombosis. The investigators hypothesize that low-grade endotoxemia may be observed in patients with coronary heart disease and may favor, at site of coronary unstable plaque, thrombus growth. To explore this issue, Escherichia Coli (EC)-LPS concentration and biomarkers of platelet activation will be measured in coronary thrombus and intra-coronary blood of patients with STEMI and stable angina (SA), respectively, and in peripheral circulation of both patients and controls. EC DNA will be searched in serum of all patients by polymerase chain reaction (PCR). Furthermore, to substantiate that LPS could be biologically active, immune-histochemical analysis of thrombi and in vitro studies will be performed to assess the interplay between LPS and platelet activation.

This is a multicenter multidisciplinary study designed to investigate patient, provider, and system-related factors that are associated with the quality and safety of initial management for suspected ST-segment elevation myocardial infarction (STEMI) evolving for less than 12 hours in daily practice. The primary hypotheses are that delayed reperfusion therapy for suspected STEMI independently relates to provider practice patterns and system barriers. It is further postulated that non-compliance with target delays in implementing percutaneous coronary intervention (PCI) or fibrinolytic therapy is associated with worse in-hospital clinical outcomes. The secondary hypotheses are that the delivery of acute reperfusion therapy within target delays is associated with increased rates of false-positive cardiac catheterization laboratory activation, inadvertent fibrinolytic therapy, and bleeding events. The project will be conducted in three emergency medical services and 23 public and private (for-profit and non-for-profit) acute care hospitals in Northern Alps in France. Data over the index hospital stay period will be retrospectively collected for all the patients included in an ongoing prospective regional hospital-based clinical registry of suspected STEMI from October, 1st, 2002 to December, 31, 2014. Inclusion of 7435 patients is anticipated. In this observational retrospective study, no specific intervention is assigned to participants. All diagnostic testing, procedures, and medication ordering are performed at the discretion of attending physicians. No enrollment or follow-up visits are planned. The primary effectiveness outcome is timely acute reperfusion therapy. The secondary effectiveness outcomes include false-positive cardiac catheterization laboratory activation for catheterization candidates and inadvertent fibrinolytic therapy. The secondary medical outcomes include in-hospital all-cause mortality, major adverse cardiovascular events, and major bleeding events. Multivariable logistic regression model will be developed to identify baseline characteristics that are independently associated with timely acute reperfusion therapy. Propensity score analysis will be performed for comparing clinical outcomes between timely acute reperfusion therapy recipients and non-recipients.

The purpose of this study is To assess percutaneous coronary intervention 's effect on short- and long- term outcomes, and complication incidence in resuscitated victims of cardiac arrest after acute myocardial infarction

Rationale: Timely and effective reperfusion by primary percutaneous coronary intervention (PPCI) is currently the most effective treatment of ST-segment elevation myocardial infarction (STEMI). However, permanent myocardial injury related to the ischemia and subsequent reperfusion is observed in the vast majority (88%) of patients and harbours a risk of heart failure development. Administration of hydrogen sulfide (H2S) has been shown to protect the heart from "ischemia reperfusion injury" in various experimental models. Data in humans suggests that the H2S-releasing agent sodium thiosulfate (STS) can be administered safely. Objective: to evaluate the efficacy and safety of STS compared to placebo treatment on myocardial infarct size in patients presenting with STEMI and treated with PCI Study design: a multicenter, double blind, randomized controlled clinical trial. A total of 380 patients, aged 18 years and above, undergoing primary PCI for a first STEMI and deemed amenable, by the investigator, to be treated with STS 12.5g intravenously (i.v.) or matched placebo immediately after arrival at the catheterization laboratory (cath-lab) and a repeated dose administered 6 hours after the first dose, on top of standard treatment. Primary endpoint is infarct size as measured with cardiac magnetic resonance imaging (CMR-imaging) 4 months after randomization.

Changes in the ambient temperature (esp. warm to cold) as well as exercise are triggers for vasospasms and plaque rupture. Weather data (temperature, precipitation in general as well as snowfall and changes in atmospheric pressure) will be correlated with the incidence of myocardial infarctions.

The objective of Left atrial appendage closure compared to standard antiplatelet therapy in patients with AF who underwent percutaneous coronary intervention (LLA-PCI) study is to evaluate the safety and efficacy of implantation of left atrial appendage closure compared to standard antiplatelet therapy for prevention of thromboembolic events and stent thrombosis in subjects with AF who underwent PCI.

Registry of an interventional Study-proved Strategy (BIC-8) using Copeptin and Troponin for the Early Rule-Out of Acute Myocardial Infarction (AMI) in Patients with Suspected Acute Coronary Syndrome (ACS) and a low-to intermediate risk profile.

This trial will compare the procedural success rate between right and left radial approach in patients undergoing coronary angiography and coronary intervention.

The aim of this study is to compare circadian variability of antiplatelet effect of prasugrel and ticagrelor maintenance doses during the initial days after acute myocardial infarction.

The purpose of this study is to measure T-Wave Alternans (TWA) in patients with acute coronary syndrome. Researchers are blinded to clinical TWA measurements. The investigators will then try to determine if T-Wave alternans correlates with clinical outcome of patients with Acute Coronary Syndrome. During routine care of the patient, the T Wave Alternans is measured.