Fig. 3

Perioperative procedures of PDA closure under the guidance of TEE. A Red arrow indicates the 5F catheter facing to the tricuspid valve; B red arrow indicates the guide wire entering the right ventricular outflow tract; C red arrow indicates the guide wire entering the pulmonary artery; D red arrow indicates the guide wire entering the ductus arteriosus; E red arrow indicates the guide wire entering the descending aorta; F red arrow indicates the delivery sheath entering the ductus arteriosus