Transposition of the Great Arteries: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Transposition of the Great Arteries?
A pediatric cardiologist usually leads care, and a heart surgeon performs the operation. After childhood, an adult congenital heart disease specialist takes over long-term follow-up. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What it is
Transposition of the great arteries (TGA) is a heart problem babies are born with. In a normal heart, the aorta sends blood to the body and the pulmonary artery sends blood to the lungs. In babies with this condition, the two vessels are switched, so oxygen-rich blood does not reach the body properly. Many of these babies also have a hole between the upper chambers, letting some oxygen-rich blood mix and keeping them alive until surgery.
Symptoms
Signs usually appear within hours or days after birth. A baby's skin, lips, or nails may look blue or pale gray because the blood does not carry enough oxygen. Babies may also breathe fast, feed poorly, or seem very sleepy.
Causes and who gets it
The defect forms during pregnancy, when a normal twisting process in the growing heart goes the wrong way and the vessels attach to the wrong chambers. Risks include maternal diabetes, alcohol use during pregnancy, or rubella early in pregnancy. Boys are slightly more often affected, but the condition is rare overall.
How doctors diagnose it
Many cases are found before birth on a routine pregnancy ultrasound and confirmed with a fetal echocardiogram. After birth, doctors check oxygen levels with a painless skin sensor called pulse oximetry and confirm the diagnosis with an echocardiogram.
Treatment
Every baby needs surgery, usually in the first days or weeks of life. Before surgery, medicine may keep a blood vessel open so more oxygen-rich blood reaches the body. The most common operation, the arterial switch procedure, moves the two vessels to their correct positions. Most children treated in time live active lives but need lifelong heart specialist checkups.
When to see a doctor
Call a doctor right away if a baby has blue or gray lips, skin, or nails, is breathing fast, is feeding poorly, or seems unusually sleepy; these signs need emergency care. Treated patients should report new symptoms to their care team promptly.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance; a concierge doctor usually charges more and often works with insurance. Either can handle yearly checkups and general health concerns and refer the patient to a cardiologist, but not manage this condition alone, since lifelong specialist follow-up is needed.
Common questions
Can this condition be found before a baby is born?
Yes. A fetal echocardiogram during pregnancy can often spot it. This lets the care team plan for delivery at a hospital with a heart center.
Can a child outgrow this problem?
No. Surgery is always needed, and follow-up care lasts a lifetime. Many people do very well after surgery, but results differ from person to person.
Can adults have transposition of the great arteries?
Yes. Some adults who had surgery as babies are living full lives today. Others may have had less complete repairs in earlier decades and need closer monitoring.
Can it be prevented?
Not always, since the cause is often unknown. Good pregnancy care helps lower some risks, such as controlling diabetes before pregnancy and avoiding alcohol during pregnancy.
Sources
- NIH Genetic and Rare Diseases Information Center - Transposition of the great arteries
- MedlinePlus - Congenital Heart Disease
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
