Key result
Lower high-pass filter settings in noncontact mapping linked to a ~5 mm atrial tachycardia focus shift.
Why the study?
Do different high-pass filter settings influence the accuracy of noncontact mapping and ablation success in patients with ectopic atrial tachycardias?
Observational (n=20)
Do different high-pass filter settings influence the accuracy of noncontact mapping and ablation success in patients with ectopic atrial tachycardias?
Different high-pass filter settings influence noncontact mapping spatial analysis of ectopic atrial tachycardias, but the small variability in foci localization does not impact final ablation success.
Answers are grounded in this paper and cite their sources.
Filter settings may modestly shift noncontact foci without affecting ablation success; leaves open optimal high-pass standardization in atrial tachycardia mapping.
The aim of the study was to define the impact of different high-pass filter settings (HPF) on the accuracy of mapping of ectopic atrial tachycardias (EAT) using a noncontact mapping (NCM) system. In 20 patients with 22 EAT a noncontact probe was deployed in the right (n = 19) or in the left atrium (n = 3). The device enables interpolation and analysis of unipolar electrograms. It provides information on focus localization and signal morphology. These parameters were compared in different HPF of 0.5 Hz, 2 Hz, 8 Hz, and 16 Hz. The NCM signal morphology was preserved at all HPF. An initial negative deflection recorded by NCM system showed a positive predictive value of 93% regarding the ablation success. The deviation (spatial disparity) between visualized focus origin and successful ablation site was 6.9 +/- 5.4 mm. Between two consecutive filter settings, the focus shift was more pronounced between 0.5 and 2 Hz (5.4 +/- 4.5 mm) compared to a setting between 8 and 16 Hz (2.9 +/- 2.9 mm; P < 0.05). Successful ablation was achieved in 15/18 right atrial tachycardias (83%) and in 2/3 left atrial arrhythmias. Different HPF influence NCM spatial analysis of EAT. However, a small variability in foci localization does not impact final ablation results.
No takes yet. Share an insight, caveat, or question.
Schneider et al. (2004) conducted an observational in Ectopic atrial tachycardias (n=20). High-pass filter settings vs. Different filter settings was evaluated on Focus shift between consecutive filter settings (p=<0.05). High-pass filter settings influenced noncontact mapping of ectopic atrial tachycardias, with a greater focus shift between 0.5 and 2 Hz than between 8 and 16 Hz.
Synapse has enriched 10 related papers. Consider them for comparative context: