BACKGROUND: Failure to achieve properly localized, permanent tissue destruction is a common cause of arrhythmia recurrence after cardiac ablation. Current methods of assessing lesion size and location during cardiac radiofrequency ablation are unreliable or not suited for repeated assessment during the procedure. MRI thermography could be used to delineate permanent ablation lesions because tissue heating above 50°C is the cause of permanent tissue destruction during radiofrequency ablation. However, image artifacts caused by cardiac motion, the ablation electrode, and radiofrequency ablation currently pose a challenge to MRI thermography in the heart. In the current study, we sought to demonstrate the feasibility of MRI thermography during cardiac ablation. METHODS AND RESULTS: An MRI-compatible electrophysiology catheter and filtered radiofrequency ablation system was used to perform ablation in the left ventricle of 6 mongrel dogs in a 1.5-T MRI system. Fast gradient-echo imaging was performed before and during radiofrequency ablation, and thermography images were derived from the preheating and postheating images. Lesion extent by thermography was within 20% of the gross pathology lesion. CONCLUSIONS: MR thermography appears to be a promising technique for monitoring lesion formation and may allow for more accurate placement and titration of ablation, possibly reducing arrhythmia recurrences.
BACKGROUND: Failure to achieve properly localized, permanent tissue destruction is a common cause of arrhythmia recurrence after cardiac ablation. Current methods of assessing lesion size and location during cardiac radiofrequency ablation are unreliable or not suited for repeated assessment during the procedure. MRI thermography could be used to delineate permanent ablation lesions because tissue heating above 50°C is the cause of permanent tissue destruction during radiofrequency ablation. However, image artifacts caused by cardiac motion, the ablation electrode, and radiofrequency ablation currently pose a challenge to MRI thermography in the heart. In the current study, we sought to demonstrate the feasibility of MRI thermography during cardiac ablation. METHODS AND RESULTS: An MRI-compatible electrophysiology catheter and filtered radiofrequency ablation system was used to perform ablation in the left ventricle of 6 mongrel dogs in a 1.5-T MRI system. Fast gradient-echo imaging was performed before and during radiofrequency ablation, and thermography images were derived from the preheating and postheating images. Lesion extent by thermography was within 20% of the gross pathology lesion. CONCLUSIONS: MR thermography appears to be a promising technique for monitoring lesion formation and may allow for more accurate placement and titration of ablation, possibly reducing arrhythmia recurrences.
Authors: C Pappone; S Rosanio; G Oreto; M Tocchi; F Gugliotta; G Vicedomini; A Salvati; C Dicandia; P Mazzone; V Santinelli; S Gulletta; S Chierchia Journal: Circulation Date: 2000-11-21 Impact factor: 29.690
Authors: Ehud J Schmidt; Maggie M Fung; Pelin Aksit Ciris; Ting Song; Ajit Shankaranarayanan; Godtfred Holmvang; Sandeep N Gupta; Miguel Chaput; Robert A Levine; Jeremy Ruskin; Vivek Y Reddy; Andre D'avila; Anthony H Aletras; Stephan B Danik Journal: Europace Date: 2013-09-06 Impact factor: 5.214
Authors: Toby Rogers; Srijoy Mahapatra; Steven Kim; Michael A Eckhaus; William H Schenke; Jonathan R Mazal; Adrienne Campbell-Washburn; Merdim Sonmez; Anthony Z Faranesh; Kanishka Ratnayaka; Robert J Lederman Journal: Circ Arrhythm Electrophysiol Date: 2016-04
Authors: Charlotte Eitel; Gerhard Hindricks; Matthias Grothoff; Matthias Gutberlet; Philipp Sommer Journal: Curr Cardiol Rep Date: 2014-08 Impact factor: 2.931
Authors: Michael A Guttman; Susumu Tao; Sarah Fink; Rick Tunin; Ehud J Schmidt; Daniel A Herzka; Henry R Halperin; Aravindan Kolandaivelu Journal: Magn Reson Med Date: 2019-09-30 Impact factor: 4.668
Authors: Michael A Guttman; Susumu Tao; Sarah Fink; Aravindan Kolandaivelu; Henry R Halperin; Daniel A Herzka Journal: Magn Reson Med Date: 2017-05-11 Impact factor: 4.668