View clinical trials related to Myocardial Ischemia.
Filter by:It would be useful to study coronary arteriovenous difference of various markers in patients who are undergoing coronary angiography for suspected coronary artery disease. Environmental and genetic factors may play a role in the progression of coronary artery disease. The goal of this project is to establish a series of cross-sectional / case-control studies to evaluate risk factors of coronary artery disease in China.
The purpose of this study is to compare graft patency rates following coronary artery bypass graft surgery performed by beating heart vs. conventional techniques using cardiac CT scanning to evaluate the bypass grafts.
Coronary angiography via the femoral artery is regarded as a safe procedure, but bleeding complications are often seen. To avoid/reduce bleeding complications digital compression is applied in the area of puncture during approximately 20 minutes and the patient is in the investigators' department observed in bed for 2 hours. The investigators apply pressure over the puncture site using a sand bag in the first hour. The patients are told not to move, to keep their legs and upper arms down and not to lift the head from the pillow in these 2 hours (standard observation). In the present study the patients are randomized between standard observation and an alternative observation, where the patients are allowed to lift their head, arms and legs during the 2 hours, otherwise as standard observation. The study has three aims: 1. To establish the incidence of bleeding complications: - Frequency of hematoma (> 5 cm) - Frequency of pseudoaneurysms - Frequency of bleeding demanding surgery - Frequency of bleeding demanding transfusion 2. Establish a model to predict in wich patient to expect a bleeding complication. 3. Assess if the alternative observation is associated with more bleeding complications compared to standard observation.
Primary intracoronary stent placement after successfully crossing chronic total occlusions (CTO) decreases the high restenosis rate at long-term follow-up compared with conventional balloon angioplasty. Several studies have shown the efficacy of sirolimus-eluting stents in selected groups of patients. Whether sirolimus-eluting stents are superior to bare metal stents in CTO is unknown. In this prospective randomized trial, bare metal stent implantation will be compared with sirolimus-eluting stent implantation for the treatment of chronic total coronary occlusions. A total of 200 patients will be followed up for 6, 12, and 24 months with angiographic follow-up at 6 months. Quantitative coronary analysis will be performed by an independent core laboratory. The primary end point is the binary angiographic restenosis and reocclusion rate at 6 month follow-up.
Controversies still exists concerning the overall clinical effects of blood-based vs. crystalloid- based cardioplegic solution for myocardial protection during cardiac arrest. Both techniques are used world-wide. No larger prospectively randomized studies comparing the two methods have been reported. The aim of this study is to collect a large number of clinical data to create a proper basis for evaluation of the two techniques.
Clopidogrel (Plavix), a platelet ADP receptor antagonist, has become the standard of care to prevent thrombosis in interventional cardiology and is increasingly being used in unstable angina and NSTEMI. An increasing number of patients are referred to emergent or urgent CABG, and several studies, as well as our own experience, have shown that preoperative administration of irreversible platelets inhibitors increase the risk of bleeding complications following CABG.
Comparison study of myocardial perfusion SPECT imaging with current clinical use camera and new camera.
In recent years, medical research into the cause and progression of heart disease due to narrowing and blockage of blood vessels to the heart muscle has improved the understanding of ischemic heart disease. It is now accepted that both the development and later progression with sudden blockage of blood vessels are associated with inflammation, although it remains unknown exactly what triggers this inflammatory process. It is possible that new blood tests which measure markers of inflammation in the bloodstream may be useful to help identify patients at risk of heart damage and assess response to treatment. The study plans to assess a new blood test for a known marker of inflammation (IL-4) in patients with heart disease. The hypothesis of this study is that, the cytokine, IL-4, measured by a new assay, is abnormally elevated in the blood of patients with coronary artery disease. Also hypothesized is that the degree of abnormality of blood IL-4, is related to important clinical events in such patients, including severity of disease, acute complications, and treatment.
The objective of our research is to determine whether treatment with magnesium will reduce the incidence of atrial fibrillation in patients undergoing cardiac surgery. Several small studies of magnesium have already been conducted, but these studies were small and the results conflicting. A large, well-conducted study of magnesium treatment is required to definitively determine whether magnesium is effective in preventing this common complication after surgery. In addition, our study will include patients undergoing valvular surgery, a group previously excluded from research despite the fact that they are at increased risk of atrial fibrillation.
Purpose: The purpose of this project is to determine how effective the telephone-based counseling program is at helping patients with heart disease become more physically active. Hypotheses to be tested: - Compared to usual care, patients in the physical activity counseling program will: 1. significantly increase total distance measured by an accelerometer and minutes of physical activity at a moderate intensity or higher, 2. have significantly higher generic and heart-disease health-related quality of life, and 3. will lead to greater improvements in the mediators of behavior change (psychosocial variables, i.e. self-efficacy, outcome expectations, etc.) at 26 and 52 weeks; - Changes in the mediators of physical activity will predict changes in physical activity outcomes at 26 and 52 weeks; - The physical activity counseling program is preferable to usual care from the perspective of health care system costs.