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Therefore, a large left-to-right shunt through a patent ductus arteriosus (PDA) results in left atrial and left ventricular enlargement. The pulmonary veins and the ascending aorta can also be dilated with a sufficiently large patent ductus arteriosus (PDA).
Many decades ago Potts shunt (Central Aortic -PA shunt)was used to increase pulmonary blood flow for severe RVOT obstruction mostly for TOF and tricuspid atresia .With the advent of ICR and Fontan role for central aorti shunts waned. Now, read this