Classification of subaortic stenosis
| Short segment subaortic obstruction (length < 1/3 of aortic valve diameter) |
|---|
| Long segment subaortic obstruction (length > 1/3 of aortic valve diameter) |
| Subaortic stenosis due to malalignment of septal structures in the presence of a VSD |
| posterior malalignment with obstruction above the VSD |
| anterior malalignment with obstruction below the VSD |
| Subaortic stenosis due to atrioventricular valve tissue in LVOT |
| accessory mitral valve tissue |
| anomalous attachment of mitral valve chordae |
| tricuspid valve tissue prolapsing through VSD |
| abnormal left atrioventricular valve in AVSD |
AVSD, atrioventricular septal defect; LVOT, left ventricular outflow tract; VSD, ventricular septal defect.