A<unk>  is one type of congenital heart defect in which either the right or left<unk><unk><unk>  is blocked or obstructed. These<unk> s represent a spectrum of disorders. __TOC__
Ventricular outflow tract obstruction
Ventricular dyssynchrony
Sinus node dysfunction
Anomalous pulmonary venous connection
Mitral annular disjunction
Dorsal intercalated segment instability
Absent pulmonary valve syndrome
Atrioventricular septal defect