Long-term low-voltage impedance measurements in subcutaneous implantable cardioverter-defibrillators.

ABSTRACT:

Background

High-voltage impedance (HVI), measured during subcutaneous implantable cardioverter-defibrillator (S-ICD) implantation via defibrillation testing or a synchronized shock, is associated with defibrillation efficacy. Recently, S-ICD systems have been upgraded to automatically perform long-term measurements of low-voltage impedance (LVI) using a 1-V subthreshold pulse.

Objective

This study evaluated LVI as a surrogate for HVI and described its long-term trends in S-ICD recipients.

Methods

We analyzed data from 1226 patients who underwent de novo S-ICD implantation across 15 Italian centers. Weekly averages of LVI and HVI were calculated, and agreement between simultaneous measurements was assessed.

Results

Over a median follow-up of 37 months (interquar

SUBMITTER: Mugnai G 

PROVIDER: S-EPMC12635742 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature