TITLE:
Electro-Anatomical Approach to Membranous Septal Aneurysm: Potential as a Focus of Critical Ventricular Arrhythmias
AUTHORS:
Hajime Imura, Hiroshige Murata, Masami Ochi
KEYWORDS:
Membranous Septal Aneurysm; Electro-Anatomical Mapping; Ventricular Tachycardia; Atrioventricular Block
JOURNAL NAME:
Surgical Science,
Vol.4 No.12,
December
5,
2013
ABSTRACT: Membranous septal aneurysm (MSA) is a rare anomaly and known to
cause ventricular tachycardia and atrioventricular block. However, underlying
mechanisms have not been addressed in its long history. We report first 3-D
electro-anatomical mapping of MSA during and three years following the surgery. An elderly patient underwent a surgery for MSA. In the mapping, we
located the His bundle near MSA and observed delayed potentials around MSA. Our
report showed that electrophysiological character of myocardium was changed
around MSA and this change might be a reason for ventricular tachycardia and
atrioventricular block. An ordinary surgery for MSA might not resolve this
problem since we still observed delayed potentials three years after the surgery.