Recovery Of Left Ventricular Function After Insertion Of Left Ventricular Assist Device: Evaluation Of Echocardiographic Parameters And Longitudinal Analysis
Funder
National Health and Medical Research Council
Funding Amount
$124,676.00
Summary
In some patients with severe heart failure, insertion of a mechanical pump to assist the heart actually leads to recovery of the heart's function. More understanding of this process is needed so we can better predict and identify it.This project aims to assess the usefulness of ultrasound (echocardiography) in measuring heart function in patients who have a mechanical pump. Once its usefulness is established, we will use it to evaluate and attempt to induce recovery in such patients.
Effects And Mechanisms Of Direct Cardiac Compression In Interruption Of Myocardial Remodelling In Chronic Heart Failure.
Funder
National Health and Medical Research Council
Funding Amount
$392,250.00
Summary
Heart failure (HF) is a disease where the heart pumping function is insufficient to provide adequate blood supply to the rest of the body. It is a highly debilitating disease affecting nearly 10 million people worldwide and has a <50% one-year survival in severe cases. Despite significant advances in pharmacotherapy, heart transplant is the only alternative for severe HF but is restricted by lack of donor organs to only ~ 5% of those requiring it. Research has shown that progression of HF is ....Heart failure (HF) is a disease where the heart pumping function is insufficient to provide adequate blood supply to the rest of the body. It is a highly debilitating disease affecting nearly 10 million people worldwide and has a <50% one-year survival in severe cases. Despite significant advances in pharmacotherapy, heart transplant is the only alternative for severe HF but is restricted by lack of donor organs to only ~ 5% of those requiring it. Research has shown that progression of HF is related to many subsequent changes after an initial insult. In addition to pumping failure, HF is associated with deranged compensatory responses such as neurohumoral over-activation, heart chamber enlargement, loss of functional cells, increase of inflammatory mediators and changes in cardiac skeleton (extracellular matrix). The changes in the heart are collectively known as remodelling. Mechanical heart assist is now considered a potential destination therapy for severe HF, superior to pharmacotherapy alone. Improvement of cardiac pumping function and even successful weaning from devices has been reported, along with observations of reverse remodelling. The success of this approach has been limited however, particularly with HF due to coronary disease, the most prevalent form. We developed a novel HeartPatch mechanical assist device to compress the heart from its outer surface. It gives support to both main chambers and avoids blood contact, a feature of currently available devices associated with complications such as blood clotting and infection. Our device has proved effective in animals with acute HF and even with cardiac arrest. We propose to study the effects of our device on the process of remodelling in HF with coronary disease in a controlled manner. The project will enhance understanding of the mechanisms involved in reverse remodelling and further the development of a device which may potentially benefit many severe HF patients.Read moreRead less
Structural And Functional Consequences Of Left Ventricular Hypertrophy Regression.
Funder
National Health and Medical Research Council
Funding Amount
$293,036.00
Summary
Left ventricular hypertrophy (LVH) is a thickening of the heart muscle walls that occurs in a variety of cardiovascular diseases, including high blood pressure, coronary artery disease, cardiac valve disorders and heart dilatation. The presence of LVH increases the risk of developing heart attacks, heart failure and death. Treatment of these disorders is a major component of our escalating health-care costs. Consequently, reversal of LVH may have significant benefits to individual patients and s ....Left ventricular hypertrophy (LVH) is a thickening of the heart muscle walls that occurs in a variety of cardiovascular diseases, including high blood pressure, coronary artery disease, cardiac valve disorders and heart dilatation. The presence of LVH increases the risk of developing heart attacks, heart failure and death. Treatment of these disorders is a major component of our escalating health-care costs. Consequently, reversal of LVH may have significant benefits to individual patients and society in general. We propose to develop a mouse model of an inherited form of LVH that is caused by gene mutations in heart muscle proteins. This model will enable us to study in detail the disease processes that cause LVH and the effects of reversing LVH. This information will be invaluable for determining the best ways of treating patients with LVH.Read moreRead less
Value Of Central Blood Pressure For GUIDing ManagEment Of Hypertension (BP GUIDE Study)
Funder
National Health and Medical Research Council
Funding Amount
$339,553.00
Summary
A pressure pulse may be felt at the wrist with every heart beat. New technology allows the analysis of this pulse and measurement of blood pressure (BP) at the heart (central BP) . This information may help doctors improve the decision making process regarding a patient's risk related to BP as well as the effect of drug treatment. The study aims to test this theory. It is expected that the new technology will improve the way people with high BP are identified and treated.
Regulatory Pathways Of Compensatory Left Ventricular Hypertrophy
Funder
National Health and Medical Research Council
Funding Amount
$309,536.00
Summary
An increase in muscle bulk (hypertrophy) of the major pumping chamber of the heart, the left ventricle, occurs as a compensatory mechanism to maintain cardiac function in a wide variety of common cardiovascular diseases, such as hypertension. Nevertheless, this compensatory mechanism appears to be strongly associated with an increased risk of death from cardiovascular disease. Consequently, the prevention or reversal of left ventricular hypertrophy is one of the major goals of the treatment of p ....An increase in muscle bulk (hypertrophy) of the major pumping chamber of the heart, the left ventricle, occurs as a compensatory mechanism to maintain cardiac function in a wide variety of common cardiovascular diseases, such as hypertension. Nevertheless, this compensatory mechanism appears to be strongly associated with an increased risk of death from cardiovascular disease. Consequently, the prevention or reversal of left ventricular hypertrophy is one of the major goals of the treatment of patients with cardiovascular disease. This project aims to improve our understanding of the complex chemical messengers in the heart muscle that control the development of hypertrophy to provide a basis for more specific drug treatments to control this process, with the aim of reducing the morbidity and mortality associated with hypertrophy.Read moreRead less
Utility Of Direct Endocardial Visualisation To Characterise Scar Morphology And Ablation Lesion Formation
Funder
National Health and Medical Research Council
Funding Amount
$421,285.00
Summary
Endocardial visualisation is a new technique in which a catheter is used to look at the internal surface of the heart without the need for surgery. We will use the visualisation catheter to find a better way of placing small burns within the heart to stop atrial fibrillation (one of the most common heart diseases). We will also use the visualisation catheter to find a better way of locating the scarred areas of the heart responsible for ventricular tachycardia (another common heart disease).
Development Of Endpoints For Catheter Ablation Of Non-mappable Scar-related Ventricular Tachycardia.
Funder
National Health and Medical Research Council
Funding Amount
$176,686.00
Summary
Ventricular tachycardia is a dangerous heart rhythm disturbance that affects people with scarring in the heart such as those with prior heart attacks or heart failure. Catheter ablation procedures, using wires passed from the groin, can be used to burn the short-circuits related to the scar. However in the majority of cases, it is very difficult to know when enough burning has been performed. This project aims to develop and validate several electrical and imaging endpoints for this procedure.
Research Fellowship: Protection Of Myocardial Function In Health And Disease
Funder
National Health and Medical Research Council
Funding Amount
$631,010.00
Summary
Heart failure (HF) is a major cause of death in Australia. A/Prof Rebecca Ritchie heads Heart Failure Pharmacology at Baker IDI. Her research focuses on new drug strategies to maintain heart function in response to diabetes & heart attack, common precursors of HF. Many of the treatments discovered from this work are naturally-occurring antioxidants; enhancing their activity will ultimately reduce progression to HF & death in the >3 million Australians affected by these disorders.