Intra-atrial reentrant tachycardia with ambiguous data from activation mapping: what to do next?

48-year-old man was referred for radiofrequency (RF) blation of atypical atrial flutter. He had undergone repair of ventricular septal defect and resection of a right ventriclar infundibular stenosis at age 36 years. At electrophysiologic study, slow atrial flutter with a ycle length of 300 ms was present. Activation mapping f the enlarged right atrium was performed, and a line of ouble potentials was identified as the old atriotomy scar Figure 1, blue dots). However, the tachycardia mechaism remained unclear. Was the mechanism a reentry ounterclockwise around the tricuspid annulus or a reenry clockwise around the atriotomy scar? What should be one next?