Okishige K, et al. - Researchers assessed the efficacy and safety of a “pull-back” maneuver (PBM) to prevent phrenic nerve (PN) injury in patients undergoing cryoballoon applications for pulmonary vein (PV) isolation. During the procedure, the PN function was monitored by recording the diaphragmatic compound motor action potentials (CMAP) and the PBM was undertaken when the CMAP amplitude was reduced by more than 30% compared to the control. They found that PN injury was effectively prevented by the PBM maneuver by creating a distance between the PN and location of the cryoballoon. In addition, no adverse events were provoked by this procedure.