Significance of 3-dimensional cardiac anatomical axis as the predictor of low QRS amplitude of subcutaneous implantable cardioverter-defibrillator.

ABSTRACT:

Background

SMART Pass (SP) deactivation is associated with inappropriate shock from a subcutaneous implantable cardioverter-defibrillator (S-ICD). A low-amplitude subcutaneous electrogram (S-ECG) is a risk factor for SP deactivation; however, the cause of the low-amplitude of S-ECG is unclear.

Objective

We aimed to investigate the relationship between the cardiac anatomical axis and S-ECG amplitude.

Methods

We retrospectively investigated 73 patients who underwent S-ICD implantation between 2016 and 2021 using computed tomography data. The cardiac anatomical axis was defined as the line connecting the summit of the inferior pyramidal space, where the atrioventricular node is supposed to be located, and the apex of the left ventricle. We assessed the relationship betwe

SUBMITTER: Uehara Y 

PROVIDER: S-EPMC12675097 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature