Atrial Electrical Remodeling Due To Chronic Stretch: Defining The Substrate For Atrial Fibrillation
Funder
National Health and Medical Research Council
Funding Amount
$428,250.00
Summary
Background: Cardiac failure is a common heart disorder in which the pumping function of the heart is significantly weakened. Mitral regurgitation is a common condition where there is a leakage of blood from the left ventricle (lower heart chamber) back into the left atrium (upper heart chamber) during normal cardiac contraction. This puts a strain on the heart and may cause heart failure. Atrial septal defect is a common form of congenital heart disease which may not be diagnosed until adulthood ....Background: Cardiac failure is a common heart disorder in which the pumping function of the heart is significantly weakened. Mitral regurgitation is a common condition where there is a leakage of blood from the left ventricle (lower heart chamber) back into the left atrium (upper heart chamber) during normal cardiac contraction. This puts a strain on the heart and may cause heart failure. Atrial septal defect is a common form of congenital heart disease which may not be diagnosed until adulthood. There are several forms but the basic problem is leakage of blood from the left atrium into the right atrium .This also puts a strain on the heart and can cause heart failure. All 3 conditions are associated with a significantly increased risk of atrial fibrillation (AF). This abnormal fast irregular cardiac rhythm makes the pumping of the heart inefficient. People with AF may feel short of breath, tired, or develop palpitations. AF is an important cause of stroke and premature death and is the most common heart rhythm disturbance occurring in upto 10% of the over 70 age group. Even after repair of the leaky valve or atrial septal defect there is still a high risk of developing this rhythm. Purpose of the study: This study will try to understand why patients with these conditions are at risk of developing atrial fibrillation, and why this risk might persist after surgical correction when this is possible (mitral regurgitation and atrial septal defect). The study will utilise sophisticated new mapping techniques to gain original insights into the mechanism of this very common and as yet poorly understood heart rhythm disturbance. The study has the potential to determine the cause of atrial fibrillation in these patient groups and as such represent a quantum advance in our understanding of he mechanism of atrial fibrillation. It would be expected to form a foundation on which development of curative and preventative approaches may be based.Read moreRead less
Assessment Of Left Atrial Function Using Electro-anatomic Mapping And Cardiac Magnetic Resonance Imaging
Funder
National Health and Medical Research Council
Funding Amount
$82,554.00
Summary
This study aims to use a novel imaging technique, cardiac magnetic resonance imaging, to assess the structure, function and blood flow of the heart chambers in patients with a heart rhythm abnormality called atrial fibrillation. Atrial fibrillation is the most common heart rhythm abnormality and is a significant cause of stroke in Australia. This study may provide us with better tools to assess the risk of stroke in patients with atrial fibrillation and allow targeted preventive strategies.
Importance Of Pulmonary Venous Electrophysiology In The Development Of Atrial Fibrillation
Funder
National Health and Medical Research Council
Funding Amount
$196,219.00
Summary
(ii) Transplant rejection can be inhibited by expression in the graft of CTLA4-Fc a reagent that blocks T cell co-stimulation enhancing allo-graft acceptance (Transplantation 2000 69:1806). High-level expression for over 100 days is expected to correlate with optimal graft acceptance. Our ability to use Kunjin to express beta galactosidase for several months in vivo without inflammation illustrates the potential for this approach (CIB ref 15). Initially we intend to use P815 cells injected i.p. ....(ii) Transplant rejection can be inhibited by expression in the graft of CTLA4-Fc a reagent that blocks T cell co-stimulation enhancing allo-graft acceptance (Transplantation 2000 69:1806). High-level expression for over 100 days is expected to correlate with optimal graft acceptance. Our ability to use Kunjin to express beta galactosidase for several months in vivo without inflammation illustrates the potential for this approach (CIB ref 15). Initially we intend to use P815 cells injected i.p. into C57BL-6, where they are usually rejected within a few days. In contrast, P815 cells with Kunjin replicon-mediated CTLA4-Fc expression should survive for an extended period. Graft survival is easily monitored using FACS and anti-H-2d antibodies.Read moreRead less
Efficacy Of Coronary Sinus Ablation For The Treatment Of Atrial Fibrillation: A Randomised Controlled Study.
Funder
National Health and Medical Research Council
Funding Amount
$377,917.00
Summary
Atrial fibrillation is the most common sustained cardiac arrhythmia in the population. Left atrial catheter ablation is rapidly becoming a drug free alternative treatment for drug-resistant atrial fibrillation. The proposed study will examine whether ablation at a unique anatomical site adjacent to the left atrium (the coronary sinus) will increase procedural success compared to the conventional approach.
Integration Of Risk Evaluation In Cardiovascular Disease Management Programs.
Funder
National Health and Medical Research Council
Funding Amount
$5,162,176.00
Summary
This study will determine the feasibility of a coordinated health care team approach to the treatment of cardiovascular disorders. It will examine a range of issues – who would most benefit from this approach, its value for money, the relative importance of health care services to consumers, and where to invest additional health funds. Built on strong collaborations between expert researchers in advanced diagnostic techniques, coordinated health care, community health care and health economics, ....This study will determine the feasibility of a coordinated health care team approach to the treatment of cardiovascular disorders. It will examine a range of issues – who would most benefit from this approach, its value for money, the relative importance of health care services to consumers, and where to invest additional health funds. Built on strong collaborations between expert researchers in advanced diagnostic techniques, coordinated health care, community health care and health economics, this provides a unique opportunity to benefit millions of Australians.Read moreRead less
Circumvenous Ablation For Treatment Of Atrial Fibrillation
Funder
National Health and Medical Research Council
Funding Amount
$341,844.00
Summary
Atrial fibrillation is the most common abnormal heart rhythm. It causes symptoms that may be disabling but also increases the risk of stroke and death. The lifetime risk of developing atrial fibrillation is 20-25%. Treatment with medications is often unsuccessful and is never curative. Recently a new minimally invasive procedure was developed that may cure some patients. The purpose of this clinical trial is to improve the curative technique to broaden the application of the new procedure.
Obstructive Sleep Apnoea As A Risk Factor For Atrial Fibrillation
Funder
National Health and Medical Research Council
Funding Amount
$64,631.00
Summary
Atrial fibrillation is the most common sustained cardiac arrhythmia and obstructive sleep apnoea is a common sleep-related breathing disorder. It has recently been suggested that OSA increases the risk of developing AF . The aim, therefore of this study, is to determine the incidence of sleep apnoea in our population of highly symtomatic patients with atrial fibrillation and to assess the outcome on arrhythmia burden of treatment with continuous positive airways pressure (CPAP).