Demonstration of pulmonary vein exit block following pulmonary vein isolation: A novel use for adenosine. - Wynn, Gareth; Gupta, Dhiraj; Maille, Baptiste; Snowdon, Richard; Waktare, Johan; Todd, Derick; Hall, Mark; Mahida, Saagar; Modi, Simon (Journal of Cardiovascular Electrophysiology, 2018)