18-F Sodium Fluoride (18F-NaF) PET for the Assessment of Bioprosthetic Aortic Valve Durability and Outcomes

"At baseline a target dose of 125 MBq 18F-NaF will be administered intravenously to all subjects who will then undergo dual cardiac and respiratory-gated PET-CT imaging of the heart and aortic valve. 125ml of iodine-based contrast agent (iohexol \[Omnipaque™\]) will be given for the CT. Nitroglycerin will be given to increase the size of the coronary arteries and a possible dose of metoprolol may be given to control target heart rate.~Repeat contrast-enhanced CT of the heart and aortic valve will be conducted at Year 2 to investigate to investigate whether 18F-NaF activity predicts progression of calcification in prosthetic valves."