Shannon Entropy Mapping -AF Ablation From First Principles
Funder
National Health and Medical Research Council
Funding Amount
$263,503.00
Summary
Atrial fibrillation (AF) is the most common heart rhythm disorder in humans, and a rapidly growing epidemic in Australia. AF occurs because electrical circuits called rotors take over the top chambers of the heart. Until now, ablation procedures to target AF have not been able to specifically target rotors, which has meant operations are often long and arduous. This project uses new mathematical techniques we have developed to localise rotors driving AF, aiming to develop a faster safer and more ....Atrial fibrillation (AF) is the most common heart rhythm disorder in humans, and a rapidly growing epidemic in Australia. AF occurs because electrical circuits called rotors take over the top chambers of the heart. Until now, ablation procedures to target AF have not been able to specifically target rotors, which has meant operations are often long and arduous. This project uses new mathematical techniques we have developed to localise rotors driving AF, aiming to develop a faster safer and more effective AF ablation.Read moreRead less
Characterisation Of CFAE Wavefront Propogation In Human Persistent AF
Funder
National Health and Medical Research Council
Funding Amount
$418,612.00
Summary
Atrial fibrillation can be eliminated by a relatively new treatment called catheter ablation, which involves modification of the electrical properties of the heart using thin wires (catheters) passed up from the leg. Targeting areas where catheters record abnormal electrical activity improves results of catheter ablation, although it is uncertain what these recordings represent. The aim of this study is to characterize these abnormal electrical signals in an attempt to improve ablation outcomes.
Shannon Entropy Mapping - AF Ablation From First Principles
Funder
National Health and Medical Research Council
Funding Amount
$439,589.00
Summary
Atrial fibrillation (AF) is the most common heart rhythm disorder in humans, and a rapidly growing epidemic in Australia. AF occurs because electrical circuits called rotors take over the top chambers of the heart. Until now, ablation procedures to target AF have not been able to specifically target rotors, which has meant operations are often long and arduous. This project uses new mathematical techniques we have developed to localise rotors driving AF, aiming to develop a faster safer and more ....Atrial fibrillation (AF) is the most common heart rhythm disorder in humans, and a rapidly growing epidemic in Australia. AF occurs because electrical circuits called rotors take over the top chambers of the heart. Until now, ablation procedures to target AF have not been able to specifically target rotors, which has meant operations are often long and arduous. This project uses new mathematical techniques we have developed to localise rotors driving AF, aiming to develop a faster safer and more effective AF ablation.Read moreRead less
Noncontact Biventricular Mapping And Intramural Ablation In A Chronic Ovine Model Of Septal Ventricular Tachycardia
Funder
National Health and Medical Research Council
Funding Amount
$519,279.00
Summary
Ventricular tachycardia (VT), an abnormal rhythm originating from the bottom portion of the heart is the major cause of sudden death in the community. Medications are not reliably effective. Expensive (costing about $40,000 every 5 years) implanted defibrillators are very effective in terminating VT, but frequently require painful shocks. Patients who require frequent treatment from their defibrillators are considered for mapping and ablation. About half of the patients with VT have the arrhythm ....Ventricular tachycardia (VT), an abnormal rhythm originating from the bottom portion of the heart is the major cause of sudden death in the community. Medications are not reliably effective. Expensive (costing about $40,000 every 5 years) implanted defibrillators are very effective in terminating VT, but frequently require painful shocks. Patients who require frequent treatment from their defibrillators are considered for mapping and ablation. About half of the patients with VT have the arrhythmia originating from the septum (heart muscle separating the two bottom portions of the heart). This area of the heart is difficult to map from an electrical point of view. A new type of mapping system called the Ensite 3000 system enables acquisition of 3,300 virtual electrical signals from within a heart chamber using an electrode array that does not have to be in direct contact with the heart muscle surface. Our evaluation of the Ensite system in one chamber of the heart has found it to be very good in identifying areas of abnormal electrical activity. It is possible that simultaneous mapping from both sides of the septum using Ensite might be useful in mapping VT originating from the septum. Destruction of the abnormal area, once identified, is generally done using a catheter, but is limited by its ability to destroy targets deep in the heart tissue. We have designed and developed a catheter that is equipped with a needle at its tip that can create deeper lesions. In this study we will be evaluating mapping using the Ensite electrodes in both ventricles in a chronic sheep model with VT originating from the septum. The Ensite mapping will be validated with detailed contact (conventional) mapping. The prototype catheter will be used to destroy the site of origin of VT, once identified. This study should enable more effective treatment of patients with VT and improve their quality of life.Read moreRead less
Atrial fibrillation is the most common heart rhythm disturbance with a prevalence of approximately 1% but which increases markedly with age. It causes debilitating symptoms, heart failure, stroke and increased mortality. It is an important determinant of neuro-cognitive decline and dementia. The studies in this proposal will help define the mechanism of this rhythm disturbance and its associated symptoms. They will help design improved treatment strategies including interventional approaches.
Atrial fibrillation (AF) has reached epidemic proportions. It results in significant burden to the individual and community with palpitations, falls, strokes, and heart failure which have contributed to an exponential rise in health care usage and hospitalisation. This application will focus on the optimal management of AF with a focus not only on therapeutics but importantly on the prevention of the arrhythmia and minimising hospitalisation.
Substrate Mapping And Ablation Of Ventricular Tachycardia
Funder
National Health and Medical Research Council
Funding Amount
$444,129.00
Summary
Sudden death is a tragic occurrence and can afflict Australians of all ages, racial and ethnic backgrounds. This research will aim to understand abnormalities in the heart muscle that cause dangerous heart rhythm abnormalities, which is the most common cause of sudden death. We will study ways to improve the technology of keyhole cardiac procedures so that it can be used to prevent these arrhythmias from occurring in the first place, and in improving the chance of long-term successful cure.