Severe hypoxemia after radiofrequency ablation for atrial fibrillation in palliatively repaired tetralogy of Fallot: A case report

Figure 1 The patient’s admission electrocardiogram indicating atrial fibrillation.

Figure 2 Preoperative echocardiography. A and B: Artificial blood vessel shadow and blood flow signal can be seen between the descending aorta and the left pulmonary artery; C: Moderate to severe tricuspid regurgitation can be seen during cardiac systole; D: No significant residual shunt was observed at the interventricular septal level.

Figure 3 Preoperative pulmonary venous computed tomography angiography imaging. A: The right heart was significantly enlarged; B: Artificial blood vessel shadow can be seen on computed tomography angiography (orange arrow); C: The left side of the descending aorta is connected to the left pulmonary artery by an artificial vessel (blue arrow); D: The artificial blood vessel is visible between the right pulmonary artery and the right ventricle (yellow arrow).

Figure 4 Postoperative cardiac ultrasound. A: Doppler ultrasound showed multicolored blood flow between the left and right atria, indicating the presence of atrial septal defect; B: The diameter of the atrial septal defect was about 0.88 cm.

Figure 5 Postoperative pulmonary imaging showed implantation of the atrial septal occluder.