Asymmetric ventricular septal defect (VSD) closure device has been designed for the closure of:
a) Sub-pulmonic ventricular septal defect
b) Peri-membraneous ventricular septal defect
c) Muscular ventricular septal defect
d) Inlet ventricular septal defect
Asymmetric VSD closure device has a shorter flange on the aortic side than the apical side to prevent impingement on the aortic valve and the conduction system. Read more… The asymmetric device needs only two millimeters of tissue on the aortic rim to hold while other devices need about 5 millimeters of tissue all around.
Symmetric devices are meant for muscular VSD closure as there is adequate tissue all around to hold the device without impinging on any important structure. It that device is used in the perimembaraneous location, it can affect function of the aortic valve and the conduction system.