Conotruncal heart malformations

Conotruncal heart malformations (also known as conotruncal heart defects or outflow tract defects) are a group of congenital heart defects that affect the conotruncal region of the heart — the area where the great arteries (aorta and pulmonary artery) connect to the ventricles. These malformations arise from abnormal development of the cardiac outflow tract during embryogenesis and include conditions such as tetralogy of Fallot, transposition of the great arteries, double outlet right ventricle, truncus arteriosus (persistent truncus arteriosus), and interrupted aortic arch. These defects primarily affect the cardiovascular system and can lead to abnormal blood flow between the heart and lungs or the heart and the rest of the body. Clinical features vary depending on the specific type of malformation but commonly include cyanosis (bluish discoloration of the skin due to low oxygen levels), difficulty breathing, poor feeding, failure to thrive, and heart failure in neonates and infants. Some forms may be detected prenatally through fetal echocardiography. Conotruncal defects are frequently associated with 22q11.2 deletion syndrome (DiGeorge/velocardiofacial syndrome), and genetic evaluation including chromosomal microarray or FISH for 22q11.2 deletion is often recommended. Other genetic causes include mutations in genes such as TBX1, NKX2-5, and GATA4, as well as associations with other chromosomal abnormalities. Treatment is primarily surgical and depends on the specific defect. Many conotruncal malformations require open-heart surgery in the neonatal period or early infancy to restore normal blood flow. Advances in pediatric cardiac surgery have significantly improved outcomes, though long-term follow-up with a cardiologist is essential, as patients may require additional interventions or experience complications such as arrhythmias, valve dysfunction, or ventricular dysfunction over time. Multidisciplinary care involving cardiology, genetics, and developmental specialists is recommended, particularly when associated syndromic features are present.

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