 Background: Radiofrequency ablation of typical atrial flutter present the most effective treament option in treatment of atrial flutter. Despite its high efficacy, due tovariant anatomy of cavotricuspid isthmus CTI, i.e. location of right coronary artery, pouches, the achievment of complete bidirectional block across the CTI is sometimes chalenging. Intracardiac echocardiography ICE is a very usefull tool for on-line vizualization of the anatomy of the atria and also for the location of catheter position on CTI during ablation. If the routine use of ICE is associated with easier atrial fluter ablation is not clear. 