Coarctation of the Aorta ✅

Related Subjects: |Aortic Anatomy |Acute Coronary Syndrome (ACS) General |Aortic Dissection |Acute Heart Failure and Pulmonary Oedema |Aortic Regurgitation (Incompetence) |Aortic Stenosis |Aortic Sclerosis |Transcatheter aortic valve implantation (TAVI)

🫀 Coarctation of the aorta (CoA) is a congenital narrowing of the aorta, most often just distal to the origin of the left subclavian artery. It causes upper body hypertension with reduced blood flow to the lower body. 💡 A classic bedside clue is radiofemoral delay with weaker femoral pulses than radial pulses. 🔊 Collateral intercostal arteries may produce bruits and, in older children or adults, can cause rib notching on chest X-ray.

📖 About

• Definition: Congenital narrowing of the thoracic aorta, usually in the juxtaductal region just beyond the left subclavian artery.
• Prevalence: Roughly 5–8% of congenital heart disease.
• Nature: Often part of a broader aortopathy, with abnormal vascular structure and stiffness rather than just a simple “narrow segment”.
• Why it matters: Even after repair, many patients remain at risk of hypertension, re-coarctation, and aortic complications.

🤝 Associations

• ♂️ More common in males.
• 👩 Turner syndrome is a classic association.
• 🔗 Bicuspid aortic valve is very common in patients with CoA.
• 🧠 Intracranial aneurysms are more common than in the general population and may increase the risk of subarachnoid haemorrhage.
• 🫀 May coexist with other left-sided obstructive lesions.

⚙️ Aetiology & Pathophysiology

• 📍 The narrowing is usually a shelf-like constriction near the ductal insertion site.
• 📈 Pressure rises proximal to the narrowing → hypertension in the head and arms.
• 📉 Distal flow falls → weaker femoral pulses, leg fatigue, claudication, and in severe neonatal cases poor systemic perfusion.
• 🌉 Over time, collateral vessels enlarge, especially through the intercostal arteries.
• 🪢 Chronic vascular stiffness means some patients remain hypertensive even after anatomically successful repair.

🩺 Clinical Presentation

• Infants / neonates:
  • 🚨 Severe coarctation may present when the ductus arteriosus closes.
  • 🍼 Poor feeding, lethargy, sweating, tachypnoea, pallor, poor lower body perfusion, metabolic acidosis, or shock.
  • 💔 May develop heart failure with LV dysfunction.
• Children / adults:
  • 📈 Upper limb hypertension → headaches, epistaxis, or incidental hypertension.
  • 🖐️ Weak or delayed femoral pulses compared with radial pulses.
  • 🥶 Cold feet or exercise-induced leg pain / claudication.
  • 🎧 Systolic murmur heard over the precordium, back, or between the scapulae.

🔍 Examination Pearls

• 💉 Measure blood pressure in all four limbs if possible.
• ⏱️ Look carefully for radiofemoral delay.
• 🎧 Listen for a systolic murmur over the left infraclavicular area, back, or scapulae.
• 🫀 Check for features of associated bicuspid aortic valve disease.
• 🦵 Lower limb pulses may be weak, delayed, or absent in severe disease.

🧪 Investigations

• ECG: May show left ventricular hypertrophy in older children and adults.
• Echocardiography: Key first-line test — shows the site of coarctation, Doppler gradient, LV function, LVH, and associated lesions such as bicuspid aortic valve.
• Chest X-ray: May show the classic “3 sign” and rib notching in older patients with established collaterals.
• CMR or CT angiography: Very important for defining anatomy, collateral vessels, aortic arch shape, and the repair site in follow-up.
• Cardiac catheterisation: Used when haemodynamic assessment or intervention planning is needed; a peak-to-peak gradient ≥20 mmHg is an important threshold in decision-making, but anatomy and hypertension also matter.
• Bloods: Routine baseline bloods may be taken, but imaging and haemodynamics are the key diagnostic tools.

⚠️ Complications

• 💉 Persistent or recurrent hypertension
• 🔁 Re-coarctation, especially after childhood repair
• 🫀 Aneurysm formation at or near the repair site
• 🪢 Aortic dissection or other aortic complications
• 🔗 Bicuspid aortic valve disease (stenosis or regurgitation)
• ❤️ Left ventricular hypertrophy and heart failure
• 🧠 Increased risk of intracranial aneurysm
• ⚡ Premature cardiovascular disease related to long-standing hypertension

💊 Management

• Medical stabilisation:
  • Control hypertension with specialist-guided therapy such as beta-blockers, ACE inhibitors, or ARBs, depending on age and context.
  • Treat heart failure if present.
  • In neonates with suspected duct-dependent systemic circulation, start prostaglandin E1 to maintain or reopen ductal flow while urgent specialist review is arranged.
• Definitive intervention:
  • Intervention is generally recommended for significant coarctation, especially when there is:
    • upper limb hypertension,
    • a catheter peak-to-peak gradient ≥20 mmHg,
    • significant anatomical narrowing, or
    • well-developed collateral flow.
  • 🔪 Surgical repair is commonly used in neonates, infants, and many young children.
  • 🩻 Balloon angioplasty with stenting is often used in older children, adolescents, adults, or for re-coarctation.
• Long-term follow-up:
  • 📅 Lifelong congenital cardiology follow-up is required.
  • 💉 Regular blood-pressure monitoring is essential because hypertension may persist even after successful repair.
  • 🫀 Periodic imaging with echo and cross-sectional imaging is needed to assess the repair site and the rest of the aorta.

📌 Long-term Risks

• 💉 Persistent hypertension is common even after repair.
• 🪢 Patients remain at risk of aortic aneurysm and dissection.
• 🧠 Intracranial aneurysm risk is increased, but screening policy varies by centre and patient factors.
• ❤️ Associated valve disease and long-term vascular risk need ongoing surveillance.

📚 High-yield exam clue: A young person with hypertension plus radiofemoral delay should always make you think of coarctation of the aorta. 🩻 The classic chest X-ray signs are rib notching and the “3 sign”.

🩺 Case 1 – Young Adult with Hypertension

A 22-year-old man is reviewed for persistent hypertension despite lifestyle measures. Examination reveals radiofemoral delay and weaker femoral pulses than radial pulses. A systolic murmur is heard over the back. Chest X-ray shows rib notching, and echocardiography confirms coarctation just distal to the left subclavian artery. Management: 🏥 Refer to congenital cardiology for definitive intervention, often stenting in this age group, with blood-pressure control in the meantime. Avoid: ❌ Do not dismiss severe hypertension in a young patient without checking femoral pulses and limb blood pressures.

🩺 Case 2 – Infant with Duct-Dependent Coarctation

A 3-week-old infant presents with poor feeding, sweating, tachypnoea, lethargy, and weak femoral pulses. The lower body is poorly perfused and there is hepatomegaly. Echo shows severe coarctation with LV dysfunction. Management: 🚑 Start prostaglandin E1, stabilise circulation, involve paediatric cardiology urgently, and arrange definitive repair. Avoid: ❌ Delaying prostaglandin when a duct-dependent systemic circulation is suspected.

🩺 Case 3 – Adult After Childhood Repair

A 30-year-old woman who had childhood coarctation repair is found to have persistent hypertension at follow-up. Cross-sectional imaging shows no major re-coarctation, but the aorta remains stiff and mildly dilated. Management: 💊 Continue blood-pressure control, maintain lifelong congenital heart disease follow-up, and arrange periodic imaging of the aorta and repair site. Avoid: ❌ Assuming repaired coarctation is “cured forever” — vascular risk and hypertension often persist.

📚 References

• 🌍 ESC Guidelines for Adult Congenital Heart Disease.
• 🏥 NHS England Congenital Heart Disease Standards and Specifications.
• 🏥 Leeds Teaching Hospitals NHS Trust – Coarctation of the aorta in children.
• 🧠 JACC Advances review: Intracranial Aneurysms in Patients With Coarctation of the Aorta: To Screen or Not to Screen?