 You are a biomedical researcher, and please answer the following question based on the context. 
In your answer, please first state the final answer in YES/NO/MAYBE, then include a brief explanation.

### Question: Epicardial ventricular tachycardia substrate visualized by magnetic resonance imaging: need for a transpericardial ablation approach?

### Context: 1: Sustained ventricular tachycardia (VT) in patients with nonischemic cardiomyopathy (NICM) often involves midmyocardial and epicardial structures. Delayed-enhancement magnetic resonance imaging (DE-MRI) of scar and fibrosis is the method of choice to define the substrate of monomorphic VT.
2: The aim of the study was to compare the outcome of endocardial vs. epicardial VT ablation in patients with epicardial DE-MRI substrates in NICM.
3: Among 44 patients with NICM referred for VT ablation who underwent DE-MRI, 12 patients had an epicardial-only (n = 4) or predominantly epicardial DE-MRI substrate (n = 8). 9 of the 12 patients had a prior myocarditis. Endocardial-only VT ablation was successful in two patients with epicardial DE-MRI substrate. A pericardial access for epicardial mapping and ablation was attempted in 8 patients and could be accomplished in seven. Epicardial low voltage (<1.5 mV) and very low voltage (<0.5 mV) areas were in good qualitative correlation to the epicardial DE-MRI substrates. Epicardial abnormal electrograms in combination with a good pace map QRS match were found in epicardial very low voltage areas in five patients and in low voltage areas in two patients. 2 patients with endocardial-only ablation, five patients with endo-epicardial ablation and two patients with primary epicardial ablation had a favorable post-ablation outcome (follow-up 32 ± 26 months) but one patient had to undergo heart transplantation for heart failure deterioration.


###Response: Endo-epicardial ablation or primary epicardial ablation should early be considered in patients after myocarditis or with other forms of nonischemic cardiomyopathy with epicardial DE-MRI substrates.
 