This week we review a recent large database study of WPW with particular interest in the patient with intermittent preexcitation. Traditionally, this finding has been considered a sign of low risk. Is this true? Who deserves formal invasive EP testing in this setting? Should all WPW pathways be ablated? These are amongst the many interesting questions discussed with Assistant Professor of Pediatrics - University of Alberta - Dr. Carolina Escudero. doi: 10.1016/j.hrthm.2020.05.035