Technology and algorithm
The ICPM algorithm distinguishes different atrial activation patterns
based on unipolar signals recorded by the coronary sinus (CS) reference
catheter. A weighted correlation mechanism applied to CS signals
counters the effect of possible physiological changes on the signals’
morphology, such as electrode tissue touch. Correlation is sensitive to
catheter movements affect reference stability and excludes inappropriate
mapping of ectopic beats. The algorithm filters unipolar signals to
remove baseline wander caused by patient movement and respiration. A
normalized correlation is then calculated for each channel (Pearson
correlation). The channels are weighted based on the maximum slope of
the pattern’s signal, indicating how prominent each channel is. A
correlation score is tabulated based on the weighted sum of calculated
single channel correlations. Correlation values are calculated for each
identified activation for a window surrounding the reference annotation
using the user selected pattern of interest (POI). The final score is
determined on the basis of the highest correlation value within that
window.