Introduction
Coarctation of the aorta is a congenital narrowing of the main artery that carries blood from the heart to the body. The pinch most often sits just beyond the branches that supply the head and arms.
Narrowing forces the heart to pump against higher resistance, raising blood pressure in the upper body while reducing flow to the legs and abdominal organs. Severity ranges from critically ill newborns to adults discovered during hypertension work-ups.
Genetic syndromes such as Turner syndrome increase risk, and other congenital heart defects may coexist. Maternal infections or harmful exposures in pregnancy can contribute to congenital heart disease risk overall.
Timely repair—surgical or catheter-based—plus lifelong blood-pressure surveillance greatly improves outcomes. This page is educational, not individualized cardiac advice.
Overview
Coarctation is a structural birth defect, not an infection acquired later in life. Mild forms may be subtle for years; severe forms present with heart failure or shock in infancy when the ductus arteriosus closes.
Classic clues include higher blood pressure in the arms than the legs, weak femoral pulses, headaches, leg fatigue with exercise, and sometimes a murmur or rib notching on chest X-ray in long-standing cases.
Males are affected more often than females. Even after successful repair, recoarctation, hypertension, and aneurysm risk mean cardiology follow-up should continue for life.
- Congenital narrowing of the aorta limiting lower-body blood flow
- Upper-body hypertension with weak leg pulses is a hallmark pattern
- May present in infancy or remain undiagnosed until adulthood
- Associated with genetic syndromes and other heart defects
- Repair is usually surgical or with stent/catheter techniques
- Lifelong monitoring for blood pressure and late complications
What happens in the body
The narrowed segment creates a pressure drop: high pressure proximal to the coarctation and low pressure distal to it. The left ventricle hypertrophies to overcome the obstruction.
Collateral arteries may enlarge over years to bypass the narrowing. Without treatment, chronic hypertension can damage the heart, brain vessels, aorta, and kidneys, and turbulent flow raises endocarditis risk.
- Fixed obstruction raises proximal aortic and arm blood pressure
- Distal hypoperfusion weakens leg pulses and can impair organ flow
- Left ventricular strain leads to hypertrophy and heart failure risk
- Collaterals and aneurysms may develop over time
Signs and symptoms
Signs depend on age and severity. Common findings include:
- High blood pressure measured in the arms
- Blood pressure or pulse weaker in the legs than the arms
- Headaches related to upper-body hypertension
- Chest pain or tightness with exertion
- Shortness of breath during activity
- Leg pain, cramps, or fatigue when walking or running
- Cold feet or poor lower-body perfusion
- In infants: poor feeding, sweating with feeds, rapid breathing, or failure to thrive
- Nosebleeds or dizziness in some hypertensive patients
- Heart murmur detected on examination
- Exercise intolerance compared with peers
- Sudden severe chest or back pain if aortic complications occur (emergency)
Causes and risk factors
Coarctation is congenital. Factors linked to higher likelihood include:
- Abnormal embryonic development of the aortic arch
- Turner syndrome and other chromosomal or genetic conditions
- Williams syndrome and selected other genetic aortopathies
- Associated congenital heart defects (for example bicuspid aortic valve)
- Male sex (higher incidence)
- Maternal diabetes, certain infections, or teratogenic exposures as broader CHD risk factors
- Family history of congenital heart disease in some cases
- Lifestyle factors do not cause the narrowing but worsen hypertension complications later
- Obesity, high-salt diet, and inactivity can aggravate post-repair blood pressure problems
- Non-modifiable congenital anatomy versus modifiable adult cardiovascular risks
Diagnosis and evaluation
Suspicion from pulse and blood-pressure differences is confirmed with imaging:
- Four-limb blood pressure and careful pulse comparison
- Physical exam for murmurs, heart failure signs, and genetic syndrome features
- Echocardiography to visualize the arch and estimate gradients
- Chest X-ray for heart size and chronic collateral signs
- MRI or CT angiography for detailed anatomy before intervention
- Cardiac catheterization in selected interventional planning
- Differentiate aortic stenosis, interrupted arch, and acquired aortic disease (for example dissection)
- Screen for associated cardiac lesions and genetic syndromes when appropriate
Treatment and management
Significant coarctation usually needs mechanical relief of the narrowing; medicines support blood pressure and heart failure but do not remove the obstruction:
- Prostaglandins in critical neonates to keep the ductus open until repair
- Antihypertensive medicines before and after intervention as directed
- Diuretics and heart-failure therapy when ventricular function is impaired
- Surgical resection with end-to-end anastomosis
- Subclavian flap aortoplasty or other surgical enlargements in selected children
- Balloon angioplasty and/or stent placement in appropriate candidates
- Lifelong cardiology follow-up for recoarctation and hypertension
- Endocarditis prevention counseling per current guidelines
- Exercise prescription individualized after repair
- Do not stop blood-pressure medicines suddenly without medical advice
Prevention, self-care, and lifestyle
Not every condition is fully preventable, but the steps below may lower risk or recurrence:
- The congenital narrowing itself cannot be prevented with lifestyle alone
- Prenatal care and avoidance of known teratogens support overall fetal heart health
- After diagnosis or repair: low-sodium heart-healthy diet and healthy weight
- Regular aerobic activity within cardiology guidance; avoid extreme isometric strain if advised
- No tobacco; limit alcohol
- Keep routine vaccines and dental care to reduce infection risks
- Never ignore severe chest pain, fainting, or sudden blood-pressure spikes
Possible complications
Delay, missed care, or unsafe self-medication can raise the chance of complications in some cases:
- Persistent or recurrent hypertension
- Recoarctation after repair
- Heart failure from chronic pressure overload
- Aortic aneurysm or dissection
- Stroke related to hypertension or associated vascular disease
- Infective endocarditis
- Kidney injury from long-standing high pressure or hypoperfusion
- Reduced life expectancy if severe disease remains untreated
When to see a doctor or seek emergency care
Seek prompt medical advice or emergency care if any of the following apply—it is safer not to wait and see:
- Infant with poor feeding, blue or gray color, rapid breathing, or lethargy—seek emergency care
- Severe chest pain or pressure
- Sudden tearing chest or back pain
- Fainting, severe breathlessness, or collapse
- Sudden weakness or numbness of limbs
- Known coarctation with uncontrolled blood pressure, new leg weakness, or pregnancy planning—arrange prompt cardiology review
Living with the condition
With timely repair and blood-pressure control, many people live active lives, though check-ups remain lifelong.
Home blood-pressure logs, medication adherence, and imaging schedules recommended by your congenital cardiology team are essential.
Discuss sports, pregnancy, and noncardiac surgery in advance so blood pressure and aortic risk are managed safely.
Frequently asked questions
What is coarctation of the aorta?
It is a birth defect in which a segment of the aorta is narrowed, limiting blood flow beyond the narrowing and often causing upper-body hypertension.
What are typical symptoms?
High arm blood pressure, weak leg pulses, exercise leg fatigue, headaches, chest pain, breathlessness, and in babies poor feeding or heart-failure signs.
How is it diagnosed?
Clinicians compare arm and leg pressures and pulses, then confirm anatomy with echocardiography and often MRI or CT angiography.
How is it treated?
Significant narrowing is relieved with surgery or catheter-based stent/angioplasty; medicines help control blood pressure and heart failure.
Can it be prevented?
The congenital lesion itself usually cannot, but healthy pregnancies and lifelong heart-risk control reduce related complications.
What is the long-term outlook?
Early treatment offers a good outlook for many, but lifelong surveillance for hypertension, recoarctation, and aortic complications is required.
Important caution
This article is general health education in English. It is not a surgical consent form or a personalized cardiology plan.
Decisions about repair timing and technique belong with a congenital heart disease specialist.
Severe chest pain, infant distress, or fainting with known aortic disease warrants emergency evaluation.