What is Tetralogy Of Fallot

Tetralogy of Fallot is a rare congenital heart defect characterized by a combination of four specific structural abnormalities that interfere with normal blood flow through the heart. While this condition requires surgical intervention, modern medical advancements have significantly improved long-term outcomes, allowing many individuals with Tetralogy of Fallot to lead full and active lives.

What are the four components of Tetralogy of Fallot?

The diagnosis of Tetralogy of Fallot is defined by a specific set of four anatomical defects that occur together during fetal heart development:

• Pulmonary Stenosis: A narrowing of the pulmonary valve and the passage from the right ventricle to the lungs.


• Ventricular Septal Defect (VSD): A hole in the wall between the two lower chambers of the heart.


• Overriding Aorta: The aorta is shifted slightly to the right, sitting directly over the VSD instead of just the left ventricle.


• Right Ventricular Hypertrophy: The muscle wall of the right ventricle becomes thickened due to the increased workload required to pump blood through the narrowed pulmonary valve.

How common is Tetralogy of Fallot?

Tetralogy of Fallot is one of the most common forms of cyanotic congenital heart disease, occurring in approximately 1 in every 2,500 live births. It affects males and females with roughly equal frequency. While the exact cause remains unknown in most cases, it is considered a sporadic condition, meaning it is not typically inherited from parents, though it is sometimes associated with genetic syndromes like DiGeorge syndrome.

How does this condition impact the body?

Because of these structural changes, oxygen-poor blood is able to bypass the lungs and circulate throughout the body, leading to lower oxygen levels in the blood (cyanosis). Patients with Tetralogy of Fallot may experience "tet spells," which are sudden episodes of deep blue skin, nails, and lips during crying or feeding, signaling a temporary drop in oxygen levels. At DiseaseMaps.org, 362 people with Tetralogy of Fallot have joined our community to share their experiences and support one another through these challenges.

Next steps

• Consult a pediatric cardiologist or a congenital heart surgeon to discuss surgical repair options.


• Maintain a consistent schedule of cardiac follow-ups, as some patients may require monitoring or interventions later in adulthood.


• Join the DiseaseMaps.org community to connect with other families and individuals navigating life with Tetralogy of Fallot.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• National Institutes of Health (NIH) - Genetic and Rare Diseases Information Center (GARD)


• Orphanet: Portal for rare diseases and orphan drugs


• Online Mendelian Inheritance in Man (OMIM)


• American Heart Association (AHA) - Congenital Heart Defects resources