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Characterization of edema after cryo and radiofrequency ablations based on serial magnetic resonance imaging.

Abstract：

INTRODUCTION:Radiofrequency (RF) and cryoablation are routinely used to treat arrhythmias, but the extent and time course of edema associated with the two different modalities is unknown. Our goal was to follow the lesion maturation and edema formation after RF and cryoablation using serial magnetic resonance imaging (MRI). METHODS AND RESULTS:Ventricular ablation was performed in a canine model (n = 11) using a cryo or an irrigated RF catheter. T2-weighted (T2w) edema imaging and late gadolinium enhancement (LGE)-MRI were done immediately (0 day: acute), 1 to 2 weeks (subacute), and 8 to 12 weeks (chronic) after ablation. After the final MRI, excised hearts underwent pathological evaluation. As a result, 45 ventricular lesions (cryo group: 20; RF group: 25) were evaluated. Acute LGE volume was not significantly different but acute edema volume in cryo group was significantly smaller (1225.0 ± 263.5 vs 1855.2 ± 520.5 mm3 ; P = 0.01). One week after ablation, edema still existed in both group but was similar in size. Two weeks after ablation there was no edema in either of the groups. In the chronic phase, the lesion volume for cryo and RF in LGE-MRI (296.7 ± 156.4 vs 281.6 ± 140.8 mm3 ; P = 0.73); and pathology (243.3 ± 125.9 vs 214.5 ± 148.6 mm3 ; P = 0.49), as well as depth, was comparable. CONCLUSIONS:When comparing cryo and RF lesions of similar chronic size, acute edema is larger for RF lesions. Edema resolves in both cryo and RF lesions in 1 to 2 weeks.

journal_name

J Cardiovasc Electrophysiol

journal_title

Journal of cardiovascular electrophysiology

authors

Yamashita K,Kholmovski E,Ghafoori E,Kamali R,Kwan E,Lichter J,MacLeod R,Dosdall DJ,Ranjan R

doi

10.1111/jce.13785

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

255-262

issue

2

eissn

1045-3873

issn

1540-8167

journal_volume

30

pub_type

杂志文章

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