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

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.