High-density electroanatomic mapping reveals that ventricular tachycardia isthmuses are complex structures with multiple entrances, exits, and dead ends of activation defined by functional block.
High-density mapping provides detailed insights into the complex architecture of VT isthmuses, which may improve targeted ablation strategies.
In the context of structural heart disease, ventricular tachycardia (VT) is related to surviving fibres in incomplete scar. New technologies which allow electroanatomic mapping at higher density and with smaller, more closely spaced electrodes have allowed new insights into the characteristics of VT circuits. VT isthmuses are complex structures, with multiple entrances, exits and dead ends of activation. The isthmus is frequently defined by regions of functional block and several VT circuits can be possible in a VT "critical zone". In this review, we discuss these new insights and how they may improve VT ablation strategies, as well as discussing emerging technologies which may further develop our understanding.
Martin et al. (Tue,) conducted a review in Ventricular tachycardia in structural heart disease. High-density electroanatomic mapping was evaluated. High-density electroanatomic mapping reveals that ventricular tachycardia isthmuses are complex structures with multiple entrances, exits, and dead ends of activation defined by functional block.