This week we review a recent paper on the topic of extended ambulatory ECG monitoring in the ACHD patient. Does this form of monitoring provide benefit versus a more traditional 24 or 48 hour "Holter" monitor? How commonly were arrhythmias in ACHD patients found after 48 hours and how commonly were changes made to management based upon these findings? We discuss these issues and more with the senior author of this work, Dr. Scott R. Ceresnak, Associate Professor of Pediatrics - Stanford University. doi: 10.1111/chd.12736