Summary Page Tetralogy of Fallot

Normal

Right ventricular outflow obstruction. Typically multi-level: small, malformed pulmonic valve, hypoplastic proximal pulmonary artery, and muscular narrowing below the valve.
Right ventricular hypertrophy (thickened muscle wall) secondary to higher pressure load on this chamber.
The aorta "overrides" the VSD.
Ventricular septal defect. With significant obstruction in the right ventricular outflow tract, blood will shunt from right to left, bypassing the lungs and leading to cyanosis.
Muscular right ventricular outflow obstruction has been cut away as part of the repair.
Patch closure of the VSD.
Right ventricular outflow patch to address all levels of obstruction.