View clinical trials related to Coronary Microvascular Disease.
Filter by:Of the patients diagnosed with ST-segment elevation myocardial infarction (STEMI) who underwent reperfusion therapy and have thrombolysis in myocardial infarction (TIMI) 3 flow, about 40% have flow alterations in the coronary microcirculation, which leads to worse remodeling of the left ventricle with a consequent increase in the mortality of this population. Clopidogrel is the only known antiplatelet medication that brings benefits to the coronary microcirculation. Ticagrelor is significantly superior to clopidogrel in terms of decreasing mortality. The main objective of this study is to compare the effect of ticagrelor versus clopidogrel on the coronary microcirculation by the Myocardial Perfusion Score Index (MPSI) obtained using Microbubble Contrasted Echocardiography (MCE) in patients who have STEMI and treated with thrombolysis.
This study hopes to provide significant technical improvement in a Myocardial Blood Flow (MBF) cardiac magnetic resonance (CMR) quantification technique to address challenges and technical limitations for MBF CMR. By developing and validating novel techniques to improve first-pass perfusion (FPP) cardiac MR, we propose to increase diagnostic accuracy by minimizing false positives and false negatives, allow for better evaluation and accurate quantification of total ischemic burden and reduce image and motion-induced artifacts. The broad, long-term objective of the proposed project is to improve the prognosis of patients with myocardial ischemia caused by coronary artery disease (CAD) or coronary microvascular dysfunction (CMD).
Angina is the most common symptom of coronary heart disease among women but unlike men most women do not have stenosis of the coronary arteries. In a large proportion of these women, coronary microvascular dysfunction (CMD) is thought to be the cause of angina. However, CMD is also demonstrable in the asymptomatic population, and may merely be an innocent bystander related to the presence of cardiovascular risk factors rather than a cause of angina symptoms. The aim of this study is to determine whether comprehensive intervention is feasible and results in improvement in both angina and microvascular function in these patients.
For part of this study, we are collecting information from patients that have been experiencing the symptoms mentioned above. We are taking this information and creating a chest pain registry to follow trends and compare different patients having similar symptoms. We hope to gain insight into the quality of life, symptoms, and cardiac events of those who are having similar symptoms. The type of information we will collect includes: demographics, quality of life, levels of anxiety related to angina pain and cardiac events occurring within a 2 year period of time. In addition, we are performing a cardiac stress MRI for research purposes to look at the blood flow in the small vessels in your heart. During the stress cardiac MRI, we will give you a medication called Regadenoson (Lexiscan) which "stresses" your heart by dilating the blood vessels to your heart. This drug is approved by the U.S. Food and Drug Administration (FDA) for this purpose. We will then be able to measure the myocardial perfusion reserve (MPR) which is a measure of blood flow through the small blood vessels to see if an abnormal MPR and small blood vessel disease is associated with an increased risk of cardiovascular events, such as heart attack. At this point, there is no specific therapy for small vessel disease. In addition we have phase II of this study which is to determine if exercise and intensive medical therapy together compared to intensive medical therapy alone improves pain from the heart and improves overall quality of life.