Transcatheter Closure of Patent Ductus Arteriosus under Echocardiography Guidance: A Randomized Controlled Noninferiority Trial

Figure 1

Transcatheter closure of a PDA under TTE guidance via femoral vein. (a) The PDA (arrow) was measured using the parasternal short-axis view. (b) The parasternal short-axis view showed that the guide wire (arrow) was located within the descending aorta. (c) Release of the aortal side disk of the occluder (arrow). (d) Release of the pulmonary side disk of the occluder (arrow). DAO = descending aorta; PA = pulmonary artery.