MEMPHIS, Tenn., Nov. 22, 2021 /PRNewswire/ — Tony and Karyn Tanner of Bossier City, La., knew that this day was coming sooner rather than later for their 17-year-old daughter Madi. Born with tetralogy of Fallot (TOF), a congenital heart defect that changes the flow of blood through the heart, she needed a pulmonary valve replacement, […]