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Figure 2 Steps of transcatheter closure technique using the ADO in a 4-month-old, 4.2-kg infant (patient 31) with a large tubular PDA. A, Descending aortogram in the lateral projection demonstrating a large type C PDA measuring 5.2 mm in diameter. B, Deployment of the retention disc (arrowhead) of a 6-mm ADO against the orifice of the ductus results in severe aortic obstruction. C, Repeat descending aortogram after deployment of the ADO inside the PDA showing good position with no obstruction to the aorta and foaming through the device. D, Descending aortogram 15 min after release of the device, revealing complete closure with good device position.