Common Flutter ablation technique use low X-ray based three-dimension (3D) navigation for catheter tracking, have become a popular implementation to treat patient's underlying arrhythmia. Compared with fluoroscopy, the gold standard X-ray based method, this recent technique provides the required anatomical information and reduce risk associated with ionizing radiation exposure. Besides Practical Guidelines "as low as reasonably achievable (ALARA) to minimize and normalize radiation exposure had been published so far. The risk of developing acute radiation associated injuries still remains high. In the present study we will compare two groups of patients undergoing into cavotricuspid isthmus (CTI) ablation using either the 3D navigation ("Ensite NavX system") (n = 25) or conventional fluoroscopy (n = 25). Further developing the 3D navigation technique will help to increase safety during the treatment, for both patients and the personnel and increase the success rate during the electrophysiological (EP) interventional procedures.

Inclusion Criteria:

• Sick adult patients with Atrial Flutter arrythmia
• patients able to consent.
• patients scheduled to receive cavotricuspid isthmus ablation treatment

Exclusion Criteria:

• patients who do not meet inclusion criteria