This week we review a recent work assessing changes in Fontan conduit cross sectional area over time. What accounts for these changes and how do these affect exercise capacity? What does the future hold for the Fontan procedure? Is there an optimal conduit size for patients? We speak with Assistant Professor of Pediatrics at USC, Dr. Neil Patel this week! doi: 10.1016/j.jtcvs.2020.09.140