Guiding Rescue LAMPOON through Personalized 3D Simulators: the role of 3D printed models in complex cardiac interventions.

Left ventricular outflow tract (LVOT) obstruction is a common and life-threatening complication of transcatheter mitral valve replacement (TMVR). The laceration of the anterior mitral leaflet to prevent outflow obstruction (LAMPOON) is a novel technique involving anterior mitral leaflet split after valve-in-ring TMVR (1). Three-dimensional (3D) printing has emerged as a powerful tool in diagnosing and planning complex percutaneous interventions (2). We report for the first time a tip-to-base LAMPOON after transcatheter mitral valve-in-ring replacement, guided by 3D-printed anatomical models.