Gross specimen evaluation of myocardium post-injection
We performed gross examination of the myocardial specimen following ablation and CNT hydrogel injection. The hydrogel could be seen circumferentially around the ablated lesion at the points where the needle entered the epicardium. Orthogonal transection showed that most of the hydrogel was retained within the ablated tissue. Some hydrogel did extrude from the lesion into areas of nonablated myocardium (Figure 5 ).