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.