View clinical trials related to Tetralogy of Fallot.
Filter by:Patients with congenital heart disease in whom the right ventricle is exposed to pressure or volume overload show progressive systolic dysfunction of the right ventricle, the fact of which conveys substantial morbidity and mortality. The aim of this study is to investigate the myocardial perfusion in these patients by myocardial contrast echocardiography (MCE) in order to determine whether disturbed blood flow plays a role in the development of right ventricular systolic dysfunction.
Tetralogy of Fallot is the most frequent complex congenital heart malformation. Over the past five decades, surgical repair has been performed with respectable results. However, relevant postoperative residues frequently remain. Pulmonary insufficiency, in particular, has been identified as a factor limiting the right ventricular function and, accordingly, the quality of life and life expectancy. With increasing use of cardiac MRI for both measurement of ventricular function and imaging of pulmonary arteries, residual defects have been discovered that were not detectable by echocardiography. There is mounting evidence of right ventricular pressure and volume stress in Fallot patients after surgical correction. At present, it is impossible to detect right ventricular insufficiency at an early stage. Hence, it is to be assumed that right ventricular insufficiency is underdiagnosed and therapeutic action frequently is initiated beyond the point of no return of ventricular function. The objective of this study is the systematic collection of cross-sectional and longitudinal data from extensive standardised examinations, including MRI, echocardiography, pulmonary function and ergometry tests, ECG and quality of life assessments, in a large number of patients with surgically corrected tetralogy of Fallot, and the setup of a database. The data obtained are supposed to provide information on the long-term outcome of surgical correction, to help establish criteria for necessity and time of re-intervention or re-operation, and to assess the effectiveness of re-interventions and re-operations.
The study team will use small pieces of human hearts which are removed as part of a required surgical procedure to study different objectives. One of the objective is how calcium ions pass through the membrane of heart cells in order to tell the heart cell how much force to contract with when the heart beats. Investigators will also study the proteins and RNA of these pieces to determine how the newborn heart cells control their force of contraction differently from adult heart cells. Investigators hypothesize that infant hearts have different regulation of calcium entry than adult hearts. The study team also wants to study combinations of 3D cardiac spheres with multiple environmental cues that can improve functional and metabolic maturation of Human pluripotent stem cell-derived cardiomyocytes (hPSC-CMs) and generate a more clinically relevant cell model.
Using biocardiac model in helping the total correction of the Tetralogy of Fallot.
Repair of tetralogy of Fallot (TOF), the most common form of cyanotic congenital heart disease, usually involves surgery on the outflow of the right ventricle (RV) and the pulmonary valve in order to relieve obstruction to blood flow from the RV to the lungs. This procedure often leads to regurgitation (leakage) of the pulmonary valve, which puts the burden of handling a larger than normal amount of blood flow on the RV. Over the years, that extra burden leads to enlargement of the RV and to a decrease in its function. Treatment often includes surgical insertion or replacement of a new pulmonary valve. Replacement of the damaged pulmonary valve aims to minimize the leakage and help the RV function better. This study is designed to compare two methods of how the operation (called pulmonary valve replacement [PVR]) is performed. In the first method, a new valve is inserted and only the area of the old valve is operated on; this is the standard PVR. The second method involves inserting the new valve in the same way as the standard method but, in addition, areas of the right ventricular wall that are scarred and not functioning well are removed (PVR plus right ventricular remodeling). This study will evaluate which method is more effective based on the size and function of the RV measured by cardiac magnetic resonance imaging (CMR) six months following surgery, as compared to its size and function before the operation.
To create a registry of all Oregon children undergoing surgical repair of congenital heart disease since 1958 in order to determine mortality, morbidity, and disability after surgery and to assess the safety of pregnancy in women with corrected congenital heart disease and the risk of prematurity and occurrence of congenital heart defects in offspring.
OBJECTIVES: I. Identify latent hypoparathyroidism in normocalcemic adult survivors with repaired conotruncal cardiac defects, by evaluating parathyroid gland secretory function after induced hypocalcemia. II. Determine the relationship of parathyroid hormone secretion to microdeletions in the same region of chromosome 22q11 as found in patients with DiGeorge anomaly.