Right ventricular outflow tract obstruction (RVOTO) can occur at any level. Supravalvar RVOTO seldom occurs alone. It may occur as part of Tetralogy of Fallot, Williams syndrome, Noonan syndrome or in combination with an ASD.
Valvar RVOTO, the most common form of RVOTO, is caused by stenosis of the pulmonic valve. It is almost always congenital in origin.
Subvalvar RVOTO usually occurs in combination with other defects, particularly VSD and Tetralogy of Fallot.
RVOTO (either valvar or subvalvar) may occur in association with subaortic stenosis.
Valvar RVOTO, the most common form of RVOTO, is caused by stenosis of the pulmonic valve. It is almost always congenital in origin.
Subvalvar RVOTO usually occurs in combination with other defects, particularly VSD and Tetralogy of Fallot.
RVOTO (either valvar or subvalvar) may occur in association with subaortic stenosis.