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Three-Dimensional Echocardiographic Method for the Visualization and Assessment of Specific Parameters of the Pulmonary Veins
Published on: October 28, 2020
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Changes in P-wave morphology after pulmonary vein isolation: insights from computer simulations
Mirabeau Saha1,2, Giulio Conte3, Maria Luce Caputo3
1Département de Physiologie Moléculaire et Intégrative, Institut de Génie Biomédical, Université de Montréal, Montréal, QC, Canada.
Summary
Computer modeling of pulmonary vein (PV) isolation shows that ablation and reconnection cause measurable P-wave changes on the 16-lead ECG. These findings can help interpret P-wave duration (PWD) and improve patient follow-up after PV ablation.
Area of Science:
- Cardiac Electrophysiology
- Computational Modeling
- Electrocardiography
Background:
- Clinical measurements of P-wave duration (PWD) before and after pulmonary vein (PV) isolation present conflicting data.
- Interpreting these clinical findings requires a better understanding of the electrical changes induced by PV isolation.
Purpose of the Study:
- To simulate P waves before and after PV isolation using a computer model.
- To aid in the interpretation of clinical PWD measurements.
- To investigate the impact of different ablation patterns on P-wave characteristics.
Main Methods:
- A computer model of the atria and torso was used to simulate P waves.
- Twenty ablation patterns were designed, including variations in ablation type, distance to PV sleeves, and inclusion of a roof line.
- Pulmonary vein reconnections were simulated as gaps in ablation lines.
- P-wave duration and area were measured on vectorcardiogram (VCG) magnitude signals and the 16-lead ECG.
Main Results:
- PV isolation prolonged biatrial activation time (0-5 ms without roof line, 48±5 ms with roof line).
- P-wave duration (PWD) in leads V3 and V4 decreased by up to 15 ms post-ablation.
- P-wave area changed in specific leads (increased in V1, decreased in V6).
- PV reconnection was best identified on leads V3, V4, and V9.
Conclusions:
- Pulmonary vein isolation and reconnection induce detectable changes in the 16-lead ECG.
- These ECG changes can potentially enhance patient follow-up after PV ablation procedures.
- The study provides a computational basis for understanding P-wave alterations post-PV isolation.
