Cardiovascular magnetic resonance guided ablation and intra-procedural visualization of evolving radiofrequency lesions in the left ventricle

Table 1 Summary of ablation details and imaging data

Lesion #	Location	RF power / Duration	T₂ map time span [min]	IR-SSFP time span [min]	MCLE	Gross pathology lesion diameter [mm]	Subject mode of death
1	Anterolateral wall	30 W/60 s	40–60	*	+	8.0	Arrhythmia
2	Anteroseptal wall	30 W/60 s	19–56	*	+	6.8	Euthanasia
3	Anterior wall	30 W/60 s	13–73	24–81	+	10.1	Euthanasia
4	Anterolateral wall	30 W/60 s	8–68	*	+	10.3	Euthanasia
5	Anterior wall	30 W/90 s	Not used due to artifact	33–55	–	11.8	Arrhythmia
6	Anteroseptal wall, apical	30 W/90 s	10–224	36–246	+	8.1	Arrhythmia
7	Anterolateral wall, apical	30 W/70 s	8–64	*	+	9.1	Arrhythmia
8	Anterior wall	30 W/100 s	3–172	20–184	–	11.9	Arrhythmia
9	Anterior wall	30 W/120 s	11–71	*	–	4.3	Arrhythmia
10	Anterior wall	35 W/120 s	11–127	18–132	–	7.9	Arrhythmia
11	Anterior wall	35 W/120 s	6–109	23–114	+	8.7	Euthanasia
12	Anterior wall	35 W/120 s	6–98	15–107	+	12.1	Arrhythmia
13	Anterior wall	30 W/90 s	9–171	19–184	+	7.1	Euthanasia
14	Anteroseptal wall	35 W/120 s	21–250	13–245	+	7.4	Euthanasia

Abbreviations: IR-SSFP inversion recovery balanced steady-state free precession, MCLE multi-contrast late enhancement, RF radiofrequency
T₂ map and IR-SSFP time spans indicate the first and last acquisitions of each type (* = lesion not clearly apparent, likely due to partial-volume effects, +/− = acquired/not acquired). Lesions 3 and 4 were created in the same individual, likewise for lesions 6 and 7

ISSN: 1532-429X