Piedmont Heart Institute View Institution's Website 1 article published in JoVE Medicine Direct Pressure Monitoring Accurately Predicts Pulmonary Vein Occlusion During Cryoballoon Ablation Ioanna Kosmidou1, Shannnon Wooden1, Brian Jones2, Thomas Deering1, Andrew Wickliffe1, Dan Dan1 1Department of Cardiac Electrophysiology, Piedmont Heart Institute, 2Cardiac Rhythm, Medtronic Inc. Effective pulmonary vein isolation utilizing a cryoballoon depends on complete pulmonary vein occlusion. The point of occlusion can be effectively predicted by direct analysis of pulmonary vein pressure waveform analysis during balloon inflation using a simple and reproducible technique.