Non-contrast-enhanced T1 -weighted MRI of myocardial radiofrequency ablation lesions

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Michael A GuttmanDaniel A Herzka

Abstract

To demonstrate imaging of radiofrequency ablation lesions with non-contrast-enhanced T1 -weighted (T1w) MRI. Fifteen swine underwent left ventricular ablation followed by MRI using different preparations: endocardial or epicardial ablation of naïve animal, or endocardial ablation of animal with myocardial infarction. Lesion imaging was performed using free-breathing, non-contrast-enhanced, T1w sequence with long inversion time (TI). Also acquired were T1 maps and delayed contrast-enhanced (DCE) imaging. Hearts were excised for ex vivo imaging, and sliced for gross pathology and histology. All ablations were visibly enhanced in non-contrast-enhanced T1w imaging using TI = 700 ms. T1w enhancement agreed with regions of necrosis in gross pathology and histology. Enhanced lesion cores were surrounded by dark bands containing contraction band necrosis, hematoma, and edema. In animals with myocardial infarction, chronic scar was hypointense in T1w, whereas acute ablations were enhanced, allowing discrimination between chronic scar and acute lesions, unlike DCE. Contrast was sufficient to create 3D volume renderings of lesions after minor postprocessing. Non-contrast-enhanced T1w imaging with long TI promises to be an effective method...Continue Reading

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Citations

Aug 15, 2018·Journal of Cardiovascular Electrophysiology·Eugene G KholmovskiRavi Ranjan
Mar 19, 2019·Journal of Cardiovascular Electrophysiology·Deming LiangAndreas Haeberlin
Oct 1, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Michael A GuttmanAravindan Kolandaivelu
Sep 11, 2019·Current Cardiovascular Imaging Reports·Rahul K MukherjeeMark D O'Neill
Sep 16, 2020·Netherlands Heart Journal : Monthly Journal of the Netherlands Society of Cardiology and the Netherlands Heart Foundation·A A HendriksT Szili-Torok
Feb 14, 2020·Pacing and Clinical Electrophysiology : PACE·Rama VunnamTimm Dickfeld
Jan 14, 2021·Biomedical Physics & Engineering Express·Duc M NguyenAlistair McEwan
May 27, 2020·Cardiac Electrophysiology Clinics·Mohammadali HabibiHugh Calkins
May 7, 2021·Journal of Cardiovascular Magnetic Resonance : Official Journal of the Society for Cardiovascular Magnetic Resonance·Aravindan KolandaiveluDaniel A Herzka
Jan 27, 2019·JACC. Clinical Electrophysiology·Susumu TaoHenry R Halperin
Aug 24, 2019·JACC. Clinical Electrophysiology·Michael BarkaganElad Anter

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