Ablation of atrial tachycardia by the QDOT MICROTM Catheter
Although the QDOT MICROTM Catheter was designed for atrial procedures data on the treatment of atrial tachycardia is limited to only one published case report.
Here a patient with perimitral atrial tachycardia with a critical isthmus on the anterior wall was treated by the QDOT MICROTM Catheter utilizing QMODE+ only. An ablation of an anterior line was performed. After 10 vHPSD applications the atrial tachycardia terminated and the anterior line was completed with a total of 29 applications with an extremely low RF time of 116seconds. No periprocedural complications occurred. Interestingly the microelectrodes of the QDOT MICROTM Catheter showed sharp and fragmented potentials at the area of the critical isthmus even though the standard electrodes showed no visible signals. This observation demonstrated the applicability of the microelectrodes for identifying potential targets for catheter ablation. The combination of microelectrodes and vHPSD ablation seems to be an interesting option for mapping and ablation of atrial tachycardias (Figure 4 ).