Different road maps for ventricular tachycardia ablation

[...]electro-anatomical mapping can be a time-consuming process, and may be hampered by inaccurate delineation of intramural scars or attenuation of electrograms by epicardial fat. [...]non-invasive imaging using computed tomography (CT) or cardiac magnetic resonance imaging (CMR) may help to delineate the arrhythmogenic substrate accurately, and subsequently guide substrate-based ablation of VTs. [...]when pre-procedural imaging was performed but did not directly affect the ablation workflow, studies were stratified as conventional ablation. Each of these factors is expected to impact on VT-free survival and mortality. [...]there was considerable overlap in patients in the image-guided VT ablation group, since four out of five studies (two from Barcelona, two from Bordeaux) were from the same cardiology centre and CMR data were available in only a subset of patients, with the remainder undergoing CT or echocardiography.