The stationary wavelet transform as an efficient reductor of powerline interference for atrial bipolar electrograms in cardiac electrophysiology
Objective : The most relevant source of signal contamination in the cardiac electrophysiology (EP)
laboratory is the ubiquitous powerline interference (PLI). To reduce this perturbation, algorithms
including common fixed-bandwidth and adaptive-notch filters have been proposed. Although such
methods have proven to add artificial fractionation to intra-atrial electrograms (EGMs), they are
still frequently used. However, such morphological alteration can conceal the accurate
interpretation of EGMs, specially to evaluate the mechanisms supporting atrial fibrillation (AF),
which is the most common cardiac arrhythmia. Given the clinical relevance of AF, a novel algorithm
aimed at reducing PLI on highly contaminated bipolar EGMs and, simultaneously, preserving their
morphology is proposed. Approach : The method is based on the wavelet shrinkage and has been
validated through customized indices on a set of synthesized EGMs to accurately quantify the
achieved level of PLI re...
Source: Physiological Measurement - Category: Physiology Authors: Miguel Mart ínez-Iniesta, Juan Ródenas, José J Rieta and Raúl Alcaraz Source Type: research
More News: Arrhythmia | Atrial Fibrillation | Bipolar | Cardiac Arrhythmia | Laboratory Medicine | Mania | Physiology