Figure Legend
Figure 1. The heart is retracted cephalad and pushed into the right pleural cavity exposing the posterior pericardial area. The anterior wall of the pulmonary vein confluence(PVC) is resected to form a window of the PVC (yellow arrow). Part of the posterior wall of the left atrium is resected to form a transverse rectangular window of the left atrium(red arrow).
Figure 2. The anterior wall of the pulmonary vein confluence(PVC) is resected to form a window of the PVC (yellow arrow). Part of the posterior wall of the left atrium is resected to form a transverse rectangular window of the left atrium(red arrow) (MPA,main pulmonary artery;VV,vertical vein;LUPV,left upper pulmonary vein;LLPV,left lower pulmonary vein;IVC,inferior vena cava;LV,left ventricle).