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Figure 6 Kaplan-Meier estimates of freedom from initial conduit replacement related to the influence of transcatheter balloon dilation with or without endovascular stenting of conduit or conduit valve stenosis. Data relates to hospital survivors following repair of persistent truncus arteriosus. Dashed line represents patients who did not have any intervening interventional cardiac catheterization to address conduit obstruction (No cath); solid line represents patients who had intervening interventional catheterization (Cath); and broken line represents the same patients as the solid line but under the assumption that if interventional catheterization were not performed they would have had conduit replacement at that date (If no cath). PA = pulmonary artery; PTA = persistent truncus arteriosus; RV = right ventricle.