Tip-to-Base LAMPOON Procedure for a Valve-in-Valve Transcatheter Mitral Valve Replacement

Left ventricular outflow tract obstruction is a life-threatening complication of transcatheter mitral valve replacement caused by septal displacement of the anterior mitral leaflet. This complication can be avoided by using of a new technique, called LAMPOON or Laceration of Anterior Mitral leaflet to Prevent left ventricular Outflow ObstructioN. LAMPOON procedure involves splitting the anterior mitral leaflet just before transcatheter mitral valve replacement, which would otherwise be displaced anteriorly by the mitral valve implant and cause left ventricular outflow obstruction. In this case report, we discuss our initial experience with the tip-to-base LAMPOON technique to prevent left ventricular outflow obstruction.