RESUMO
An ageing population and increased utilisation of tissue valves in younger patients imply that the number of patients receiving transcatheter aortic valve implantation within failed bioprostheses will continue to increase. There are two major adverse events associated with aortic valve-in-valve procedures that may temper the enthusiasm for these appealing interventions. Residual stenosis is the "Achilles' heel" of aortic valve-in-valve, while coronary obstruction is an uncommon but life-threatening adverse event. Prevention of these adverse events is essential. Emerging tools and techniques enable operators to manipulate existing devices and to implant new ones inside them safely. Considering the available evidence, it seems that bioprosthetic valve ring fracture and bioprosthetic or native aortic scallop intentional laceration to prevent iatrogenic coronary artery obstruction (BASILICA) may enable some solution. Until we have prosthetic valves that are both very durable and non-thrombogenic, we can expect that techniques and tools chosen to treat failed bioprosthetic valves effectively will continue to be designed and utilised.
