- Poster presentation
- Open Access
Cardiac magnetic resonance of acute atrial ablation injury - impact of catheter-myocardium contact force
© Williams et al.; licensee BioMed Central Ltd. 2014
- Published: 16 January 2014
- Contact Force
- Ablation Procedure
- Ablation Lesion
- Atrial Ablation
- Ablation Line
Catheter-myocardium contact force (CF) is a major determinant of ablation lesion generation in the atrium, with higher CF associated with greater energy transfer. Previous publications have suggested that acute atrial injury can be visualized with T2-weighted (T2W) cardiac magnetic resonance (CMR). This study therefore sought to compare T2W images of acute ablation lesions created at low and high CF.
Under general anesthesia, femoral venous access was obtained in eight male Göttingen minipigs. In two animals, pre-ablation T2W CMR imaging was performed. Using fluoroscopy, a decapolar reference catheter was placed in the coronary sinus and a force-sensing ablation catheter (SmartTouch, D curve, Biosense Webster) was advanced into the right atrium. Using an electroanatomical mapping system (Carto3-MEM) the geometry of the right atrium was obtained with a 20-pole circular mapping catheter (Lasso Nav, D curve, Biosense Webster). A linear ablation lesion was created from the SVC to the IVC (30W, 48°C, 8 ml/min irrigation). Different target contact forces (>20 g (high force) or <10 g (low force)) were used alternately at the cranial and caudal halves of the ablation line. After the ablation procedure, the animals were immediately transferred for T2W CMR imaging of the ablation lesion. Maximal wall thickness in the posterior right atrium was measured for the caudal and cranial portions of the ablation lines.
Wall thickness measured on post-ablation T2W images is significantly greater in areas of ablation performed with high contact force compared to areas of ablation performed with low contact force. These findings indicate that T2W CMR could facilitate the acute assessment of ablation lesion transmurality in patients undergoing atrial ablation procedures.
Funding for this research was provided by Biosense Webster.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.