This figure shows the common principle subjacent to intra-atrial switch. Figure 7A shows in diagrammatic fashion, the redirection of pulmonary and systemic venous flows at atrial level. An external conduit (B) is placed to overcome the obstruction within the left ventricular outflow tract. (adapted from . Martins P, Tran V, Price G, Tsang V and Cook A, Cardiol Young 2008; 18:124–34, with permission from Cambridge University Press).