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Cardiac magnetic resonance of acute atrial ablation injury - impact of catheter-myocardium contact force

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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)... 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... Maximal wall thickness in the posterior right atrium was measured for the caudal and cranial portions of the ablation lines... There was no pre-ablation enhancement seen with T2W imaging in either of the two pre-ablation scans... The mean time from ablation to post-ablation T2W imaging was 1 hour 28 minutes (SD = 19 minutes)... Wall thickness measured on post-ablation T2W images was significantly greater in the high CF region than the low CF region, for both the caudal (7.0 mm vs. 4.6 mm; p = 0.016) and cranial (6.9 mm vs. 4.6 mm; p = 0.038) aspects of the ablation line (see Figure 1)... 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.

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TOP PANEL Mean T2W wall thickness for high and low ablation forces at the caudal and cranial aspects of the ablation lines. * Indicates statistical significance. BOTTOM PANEL Typical pre- (A and C) and post-ablation (B and D) T2W images from one animal. Enhancement resulting from ablation is indicated with arrows, for low-force (B) and high force (D) portions of the ablation line.
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Figure 1: TOP PANEL Mean T2W wall thickness for high and low ablation forces at the caudal and cranial aspects of the ablation lines. * Indicates statistical significance. BOTTOM PANEL Typical pre- (A and C) and post-ablation (B and D) T2W images from one animal. Enhancement resulting from ablation is indicated with arrows, for low-force (B) and high force (D) portions of the ablation line.

Mentions: There was no pre-ablation enhancement seen with T2W imaging in either of the two pre-ablation scans. The mean time from ablation to post-ablation T2W imaging was 1 hour 28 minutes (SD = 19 minutes). Wall thickness measured on post-ablation T2W images was significantly greater in the high CF region than the low CF region, for both the caudal (7.0 mm vs. 4.6 mm; p = 0.016) and cranial (6.9 mm vs. 4.6 mm; p = 0.038) aspects of the ablation line (see Figure 1).


Cardiac magnetic resonance of acute atrial ablation injury - impact of catheter-myocardium contact force
TOP PANEL Mean T2W wall thickness for high and low ablation forces at the caudal and cranial aspects of the ablation lines. * Indicates statistical significance. BOTTOM PANEL Typical pre- (A and C) and post-ablation (B and D) T2W images from one animal. Enhancement resulting from ablation is indicated with arrows, for low-force (B) and high force (D) portions of the ablation line.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4043965&req=5

Figure 1: TOP PANEL Mean T2W wall thickness for high and low ablation forces at the caudal and cranial aspects of the ablation lines. * Indicates statistical significance. BOTTOM PANEL Typical pre- (A and C) and post-ablation (B and D) T2W images from one animal. Enhancement resulting from ablation is indicated with arrows, for low-force (B) and high force (D) portions of the ablation line.
Mentions: There was no pre-ablation enhancement seen with T2W imaging in either of the two pre-ablation scans. The mean time from ablation to post-ablation T2W imaging was 1 hour 28 minutes (SD = 19 minutes). Wall thickness measured on post-ablation T2W images was significantly greater in the high CF region than the low CF region, for both the caudal (7.0 mm vs. 4.6 mm; p = 0.016) and cranial (6.9 mm vs. 4.6 mm; p = 0.038) aspects of the ablation line (see Figure 1).

View Article: PubMed Central - HTML

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

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)... 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... Maximal wall thickness in the posterior right atrium was measured for the caudal and cranial portions of the ablation lines... There was no pre-ablation enhancement seen with T2W imaging in either of the two pre-ablation scans... The mean time from ablation to post-ablation T2W imaging was 1 hour 28 minutes (SD = 19 minutes)... Wall thickness measured on post-ablation T2W images was significantly greater in the high CF region than the low CF region, for both the caudal (7.0 mm vs. 4.6 mm; p = 0.016) and cranial (6.9 mm vs. 4.6 mm; p = 0.038) aspects of the ablation line (see Figure 1)... 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.

No MeSH data available.