How is tetralogy of Fallot (TOF) classified?

Updated: Nov 13, 2018
  • Author: Shabir Bhimji, MD, PhD; Chief Editor: Yasmine S Ali, MD, FACC, FACP, MSCI  more...
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Tetralogy of Fallot (TOF) (pronounced te-tral-uh-jee of Fal-oh) is one of the most common congenital heart disorders (CHDs). This condition is classified as a cyanotic heart disorder, because tetralogy of Fallot results in an inadequate flow of blood to the lungs for oxygenation (right-to-left shunt) (see the following image). Patients with tetralogy of Fallot initially present with cyanosis shortly after birth, thereby attracting early medical attention. In most cases, the cyanosis does not present for a few weeks or months after birth; however, infants born with transposition of the great vessels usually present with cyanosis immediately after birth.

Anatomic findings in tetralogy of Fallot are depic Anatomic findings in tetralogy of Fallot are depicted.

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