Background:
Left ventricular (LV) outflow
tract (LVOT) obstruction increases mortality in patients undergoing
transcatheter mitral valve implantation (TMVI) in degenerated
bioprostheses, annuloplasty rings, and native mitral valves.
We
aimed to evaluate the LVOT area after TMVI using 3-diensional (3D)
transesophageal echocardiography (TEE) and to investigate the
pre-procedural cardiac geometry affects the LVOT area after TMVI.
Methods:
We retrospectively reviewed
echocardiography data in 43 patients who had TMVI.
A change in pressure gradient
across LVOT from before to after TMVI (∆PG) and
post-procedure 3D LVOT cross
sectional area at the level of the most distal portion of the mitral
valve stent that was closest to the LV apex were assessed as evidence of
LVOT narrowing.