The Impact of Filter Settings on Morphology of Unipolar Fibrillation Potentials

AbstractUsing unipolar atrial electrogram morphology as guidance for ablative therapy is regaining interest. Although standardly used in clinical practice during ablative therapy, the impact of filter settings on morphology of unipolar AF potentials is unknown. Thirty different filters were applied to 2,557,045 high-resolution epicardial AF potentials recorded from ten patients. Deflections with slope ≤ − 0.05 mV/ms and amplitude ≥ 0.3 mV were marked.High-pass filtering decreased the number of detected potentials, deflection amplitude, and percentage of fractionated potentials ( ≥ 2 deflections) as well as fractionation delay time (FDT) and increased percentage of single potentials.Low-pass filtering decreased the number of potentials, percentage of fractionated potentials, whereas deflection amplitude, percentage of single potentials, and FDT increased.Notch filtering (50  Hz) decreased the number of potentials and deflection amplitude, whereas the percentage of complex fractionated potentials (≥ 3 deflections) increased. Filtering significantly impacted morphology of unipolar fibrillation potentials, becoming a potential source of error in identification of abl ative targets.Graphical AbstractImpact of filtering on morphology of unipolar AF potentials. High-pass, low-pass and notch filters were applied to 2,557,045 high-resolution epicardial AF potentials recorded from ten patients. Filtering significantly impacted AF potential morphology, i.e., numbe...
Source: Journal of Cardiovascular Translational Research - Category: Cardiology Source Type: research