Dye or not dye, the Cryoablation dilemma

In this issue of the Journal, Hasegawa et al. report the results of a prospective randomized study with the comparison between the pressure wave approach as alternative modality to assess pulmonary vein (PV) occlusion and the conventional strategy of contrast injection to guide cryoballoon pulmonary vein isolation. The Authors need to be applauded for having shown the value of this alternative technique, only described elsewhere in a anedoctal fashion or small clinical studies (1-3).