Dr Claudio Bussadori, inspirational veterinary specialist in cardiology and experienced human interventional cardiologist from the Clinica Veterinaria Gran Sasso in Milan, discusses aortic stenosis with Jose and Kieran. In the 23-years since he led the seminal guidelines used to assess the severity of congenital outflow tract stenosis in dogs, our understanding and approach to aortic stenosis has evolved - Dr Bussadori's unique comparative approach allows a wide-ranging discussion of this fascinating topic.