View clinical trials related to Coronary Artery Disease.
Filter by:To investigate the effect of different dosages of aspirin on platelet aggregation and to determine the possible mechanisms of aspirin resistance, we intend to compare the effects of low, medium dose aspirin with clopidogrel (an alternative antiplatelet agent) in patients after coronary artery bypass surgery.
The purpose of this study is to determine whether bivalirudin given during PCI is associated with better outcomes compared to un-fractionated heparin.
Aspirin was proved to be the drug preventing vein grafts from closure and improving clinical outcome after coronary artery bypass surgery. It appears to be effective when being prescribed as early as first 48 hr. after the operation without increasing the incidence of bleeding complications. the exact effective dose is not known.
Mesenchymal stem cells from the bone marrow can be stimulated to differentiate into endothelial cells and participate in the development of new blood vessels in ischemic tissue. The aim of the study is in a phase I/II safety and efficacy study to evaluate the clinical effect of autologous mesenchymal stem cell therapy in patients with severe chronic myocardial ischemia.
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.