Figure 4: Images of Echocardiography During Procedure

During PCU a “cavitation bubble cloud” is visible as a hyperechogenic zone <b>(red arrow)</b>. After PCU, the improvement of the bioprosthesis opening is confirmed thanks to the echocardiography <b>(green arrow)</b>. The images are realized during diastasis (closed aortic valve). See Supplemental Video 1. Ao = aorta; other abbreviations as in Figure 2.

经皮心脏超声（Percutaneous Cardiac Ultrasound，PCU）操作期间，“空化气泡云”表现为高回声区<b>（红色箭头）</b>。PCU操作结束后，经超声心动图证实生物瓣膜假体的开放功能得到改善<b>（绿色箭头）</b>。本系列图像采集于舒张期（主动脉瓣关闭状态）。详见补充视频1。Ao=主动脉；其余缩写同图2。