Anatomical Determinants of Papillary Muscle Arrhythmias in Apparently Normal Hearts.

ABSTRACT:

Background

Myocardial connections of left ventricular (LV) papillary muscles (PM) are determinants of QRS variability in the case of PM arrhythmias. We investigated the anatomical substrate of monomorphic versus polymorphic LV PM arrhythmias in patients with apparently normal hearts, as well as ablation outcomes.

Methods

Thirty-two patients were eligible for analysis. Thirteen patients underwent ablation. With advanced cardiac imaging (cardiac MRI or multidetector CT), we determined the number of PM-PM and PM-surrounding myocardium connections, PM architecture according to the number of strands and the level of LV trabeculation.

Results

Combinations of unifocal (monomorphic premature ventricular complexes [PVCs]), multiform PVCs and/or runs of polymorphic PM arrhythmi

SUBMITTER: Rivera S 

PROVIDER: S-EPMC12439190 | biostudies-literature | 2025

REPOSITORIES: biostudies-literature