Joyce T. Johnson

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Patients with single ventricle physiology face significant morbidity and mortality following the Fontan procedure resulting in the need for additional cardiac reinterventions. Online patient education resources provide limited information on the reinterventions performed in single ventricle patients following the Fontan procedure. We sought to determine(More)
BACKGROUND Incomplete echocardiographic assessment accounts for approximately 10% of preventable diagnostic errors and may place children at risk for adverse outcomes or increased testing. The aim of this study was to determine if physician review of images improves study completeness. METHODS A prospective quality improvement (QI) study initiated(More)
Echocardiography provides adequate preoperative imaging for most young infants with congenital heart disease (CHD). When anatomic details require further clarification, cardiac magnetic resonance imaging (CMRI) may be useful but adds the risks of sedation or general anesthesia for a vulnerable population. This study aimed to determine the safety of CMRI and(More)
Many factors in the delivery and perinatal care of infants with a prenatal diagnosis of congenital heart disease (CHD) have an impact on outcome and costs. This study sought to determine the modifiable factors in perinatal management that have an impact on postnatal resource use for infants with CHD. The medical records of infants with prenatally diagnosed(More)
Newborns with hypoplastic left heart syndrome and other single right ventricular variants require substantial health care resources. Weekend acute care has been associated with worse outcomes and increased resource use in other populations but has not been studied in patients with single ventricle. Subjects of the Single Ventricle Reconstruction trial were(More)
Based on outcome data, surgery is recommended for asymptomatic adults with chronic mitral regurgitation (MR) and systolic dysfunction, marked left ventricular (LV) dilation, pulmonary hypertension, atrial fibrillation, or high likelihood of successful repair; but indications for children are poorly defined. We sought to determine predictors of postoperative(More)
OBJECTIVES To describe acute and mid-term results of hybrid perventricular device closure of muscular ventricular septal defects (mVSDs). BACKGROUND Perventricular device closure of mVSDs can mitigate technical limitations of percutaneous closure and need for cardiopulmonary bypass or ventriculotomy with a surgical approach. METHODS This is a(More)
BACKGROUND Patients with Trisomy 21 are now living well into adulthood. Little data exists to assist the cardiologist in the care of these patients. We sought to examine the cardiac and general health status of adults with Trisomy 21 undergoing cardiac evaluation. METHODS & RESULTS A retrospective review of all affected adults >21years followed at 2(More)
There are few data to guide aspirin therapy to prevent shunt thrombosis in infants. We aimed to determine if aspirin administered at conventional dosing in shunted infants resulted in ≥50% arachidonic acid (AA) inhibition in short and midterm follow-up using thromboelastography with platelet mapping (TEG-PM) and to describe bleeding and thrombotic events(More)
A comprehensive cardiac magnetic resonance (cardiac MR) study including both late gadolinium enhancement (LGE) and MR angiography may be indicated for patients with a history of acquired or congenital heart disease. To study the novel use of an extracellular agent for assessment of LGE combined with a blood pool contrast agent for detailed MR angiography(More)