View clinical trials related to Heart Diseases.
Filter by:To investigate the composition and nature of weight loss and weight maintenance during the Look AHEAD trial. Also, to model changes in resting energy expenditure and changes in cardiac structure and function associated with weight loss.
This study will explore new ways of using magnetic resonance imaging (MRI) to evaluate the heart and blood vessels of patients with cardiovascular disease, including better detection of myocardial infarction (heart attack) and blockage of heart and leg arteries. Patients 18 years of age and older with cardiovascular disease may be eligible for this study. All participants will have magnetic resonance imaging of the heart. MRI uses a magnetic field and radio waves to show structural and chemical changes in tissues. For the procedure, the patient lies on a table surrounded by a metal cylinder (the scanner). A 'gadolinium contrast' material may be injected into the patient s vein during part of the study to brighten the images. Patients wear earplugs during the scan to muffle loud knocking sounds caused by the electrical switching of the magnetic fields. They will be asked to hold their breath intermittently for 5 to 20 seconds during the scan. They will be monitored with an electrocardiogram (EKG) during the procedure and will be in contact by intercom at all times with the person performing the scan. Patients can request to stop the study and come out of the scanner at any time. The procedure may last from 30 to 90 minutes. An echocardiogram a test that uses sound waves to produce pictures of the heart and blood vessels-may be done to confirm the MRI findings. In addition, patients may undergo one or more of the following optional studies: - Dobutamine stress MRI - This test uses dobutamine-a medicine that simulates exercise by increasing heart rate and heart function-to detect blockages in the coronary arteries (vessels that supply oxygen and nutrients to the heart) and locate areas of the heart that are permanently damaged, perhaps by a previous heart attack. For this test, MRI pictures of the heart are taken before, during and after administration of dobutamine. Gadolinium may be injected during part of the study to brighten the images. An EKG will be used to monitor the heart during the procedure. - Vasodilator MRI - The procedure and objectives of this test are the same as those described for dobutamine stress MRI, except that this study uses dipyridamole or adenosine. These drugs dilate blood vessels, causing increased blood flow to the heart. - Plethysmography MRI - This test determines the presence and severity of narrowing in arteries that supply blood to the leg. Blockage of these vessels often causes pain while walking. This study will compare plethysmography MRI with venous occlusion plethysmography, an older method of measuring blood flow in the legs. For venous occlusion plethysmography, a large blood pressure cuff is placed around the upper leg and a strain gauge (thin elastic band) is placed around the calf. The pressure cuff is inflated very tightly for 5 minutes to block blood flow to the leg, and another pressure cuff over the ankle is also inflated. When the large cuff is deflated, blood rushes to the leg, a smaller cuff is inflated to a low pressure, and the strain gauge measures the maximum blood flow to the leg for 1 or 2 more minutes. This procedure is done once or twice outside the MRI scanner and once or twice inside the scanner. The scans are performed as described above for the dobutamine and vasodilator studies. The strain gauge is not used for plethysmography MRI the MRI pictures are used to measure flow.
The goal of this study is to improve the overall physical health and quality of life of patients attached to mechanical heart devices while awaiting heart transplantation. Qigong, an ancient Chinese exercise that involves active participation of the individual in the form of meditation, breathing exercises and simple physical movements, is used in combination with a structured exercise program. We are testing the hypotheses that Qigong, in combination with a structured exercise program that combines aerobic and resistance training will improve the cardiovascular health and improve the quality of life of patients on mechanical heart devices. To test these hypotheses, we are measuring cardiovascular function and quality of life parameters in patients attached to mechanical heart devices who have participated in the exercise program and have practiced Qigong, and comparing these measures to patients who participated in the exercise program, but did not practice Qigong. Information gained from this research will serve as a basis from which the application of exercise training and Qigong can be applied to the treatment of other chronic diseases in which the physical conditioning and/or quality of life of individuals is compromised.
The purpose of this study is to evaluate arterial patency and left ventricular ejection fraction by examining angiographic data one year following a heart attack and treatment with late revascularization.
To assess the efficacy of a 2-year family-based weight prevention program in a cohort of overweight preschool children and overweight parent pairs.
To evaluate the efficacy of peer-based skills training to enhance weight control and improve psychosocial functioning in overweight adolescents.
To characterize the pattern of change over a two year period in energy expenditure and energy intake in two cohorts of American Indian (AI) children.
To determine familial and non-familial causes for susceptibility to atherosclerosis and the inflammatory response.
To determine whether maternal undernutrition in pregnancy is associated with differences between siblings for cardiovascular risk factors in adulthood.
The purpose of this study is to investigate the cardiac, clinical, and genetic aspects of arrhythmogenic right ventricular dysplasia (ARVD), a progressive disorder that predominantly affects the right side of the heart and causes ventricular arrhythmias.