Coarctation of the Aorta

📋 Key Information Summary

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Definition: Coarctation of the aorta (CoA) is a discrete narrowing of the aortic lumen, most commonly at the isthmus (junction of the ductus arteriosus and the aorta), producing an obstruction to left ventricular outflow and a pressure gradient between the upper and lower body.
Epidemiology: Accounts for approximately 5–8 % of all congenital heart defects in Australia; male-to-female ratio ≈ 2:1 (excluding Turner syndrome); incidence ~3–4 per 10,000 live births.
Key associations: Bicuspid aortic valve (BAV) in 50–85 % of cases; Turner syndrome (45,X) in ~10–15 %; Berry (intracranial) aneurysm; patent ductus arteriosus; ventricular septal defect.
Classical triad: Upper-limb hypertension, radiofemoral pulse delay, and systolic murmur loudest at the left scapular region.
Critical neonatal presentation: Duct-dependent CoA presenting with cardiogenic shock, acidosis, and absent femoral pulses when the ductus arteriosus closes — a surgical emergency.
Diagnosis: Transthoracic echocardiography (TTE) as first-line; cardiac MRI is the gold-standard for anatomical delineation in adolescents and adults; CT angiography when MRI is contraindicated.
Haemodynamic criterion: Peak systolic gradient ≥ 20 mmHg across the coarctation site by Doppler or catheter is generally considered significant.
Treatment options: Surgical repair (extended end-to-end anastomosis preferred in neonates and infants); transcatheter balloon angioplasty (± bare-metal stent) for older children, adolescents, and adults with recurrent or native coarctation.
Prognosis without repair: Median age at death ~35 years due to complications including refractory hypertension, aortic dissection/rupture, intracranial aneurysm haemorrhage, coronary artery disease, and heart failure.
Lifelong surveillance: All repaired patients require ongoing cardiology follow-up; hypertension persists in 25–70 % post-repair and requires pharmacotherapy; imaging every 5 years (MRI preferred) to monitor for re-coarctation and aortic root dilation.
ATSI considerations: Higher rates of delayed diagnosis in remote communities; echocardiographic screening in infants with upper-limb hypertension or pulse abnormalities; culturally safe pathways through Aboriginal Medical Services.

Introduction & Australian Epidemiology

Coarctation of the aorta (CoA) is a congenital narrowing, typically located at the aortic isthmus distal to the origin of the left subclavian artery, at or near the former insertion of the ductus arteriosus. This obstruction imposes a pressure load on the left ventricle and produces a pressure gradient between the upper and lower extremities. The condition is classified by timing of presentation — neonatal (duct-dependent, critical) versus infantile (re-coarctation or late-diagnosed) versus adult (often previously undiagnosed or with residual gradient post-repair).

In Australia, CoA represents 5–8 % of all congenital heart disease, with an estimated incidence of 3–4 per 10,000 live births. The Australian Paediatric Cardiac Registry and AIHW congenital anomaly data confirm a male predominance (≈ 2:1) outside Turner syndrome. Newborn pulse-oximetry screening programmes have improved early detection of duct-dependent lesions, though isolated CoA without significant shunting may still present late with hypertension or exercise intolerance.

The Australasian Society of Cardiac and Thoracic Surgeons (ASCTS) database shows excellent outcomes for neonatal repair at Australian paediatric cardiac centres (Royal Children's Hospital Melbourne, Westmead Children's Hospital Sydney, Queensland Children's Hospital Brisbane), with operative mortality < 1 % for elective extended end-to-end anastomosis. Late complications — including re-coarctation, persistent hypertension, aortic root dilation, and Berry aneurysm — necessitate structured lifelong follow-up.

⚠️

Red flag — duct-dependent coarctation in neonates: When the ductus arteriosus closes (typically within the first 24–72 hours of life), infants with critical CoA develop rapidly progressive cardiogenic shock, profound acidosis, absent femoral pulses, and metabolic acidosis. This is a surgical emergency requiring immediate prostaglandin E₁ infusion (Alprostadil 10–50 ng/kg/min IV) and transfer to a tertiary paediatric cardiac centre.

Pathophysiology & Associations

Anatomical Basis

Coarctation results from invagination of the ductal (juxtaductal) tissue into the aortic wall during perinatal life, forming a discrete posterior shelf that narrows the aortic lumen. Less commonly, tubular hypoplasia of the aortic arch or a long-segment narrowing occurs, particularly in neonates with complex intracardiac lesions.

Haemodynamic Consequences

Proximal hypertension: Systolic and diastolic pressures rise in the ascending aorta and branches (subclavian, carotid), exposing the brain, heart, and upper body to chronic pressure overload.
Distal hypotension: Reduced perfusion pressure in the descending aorta, mesentery, and lower extremities causes lower-limb claudication, cool extremities, and exercise intolerance.
Collateral circulation: Chronic obstruction stimulates development of internal mammary, intercostal, scapular, and mediastinal collaterals — visible on chest radiography as rib notching in older children and adults.
Left ventricular hypertrophy: Progressive pressure overload leads to concentric LV hypertrophy, diastolic dysfunction, and ultimately systolic heart failure if untreated.
Activation of the RAAS: Renal under-perfusion stimulates renin release, contributing to systemic hypertension that may persist even after anatomical repair.

Associated Anomalies

Association	Prevalence	Clinical Significance
Bicuspid aortic valve (BAV)	50–85 %	Risk of aortic stenosis/regurgitation, aortopathy; requires serial echo surveillance
Turner syndrome (45,X)	10–15 % of CoA patients	Mandatory karyotyping in all females with CoA; increased risk of aortic dissection, hypothyroidism, short stature
Intracranial (Berry) aneurysm	5–10 %	Screen with MRA brain at diagnosis; risk of subarachnoid haemorrhage
Patent ductus arteriosus (PDA)	30–40 % (neonates)	Maintains lower-body perfusion prenatally; prostaglandin bridge to surgery
Ventricular septal defect (VSD)	15–25 %	Adds volume load; may require concomitant surgical repair
Mitral valve abnormality	~20 %	Bicuspid mitral valve, parachute MV; contributes to diastolic dysfunction
Shone complex	~5 %	Supravalvular mitral ring, parachute MV, subaortic stenosis, CoA — left-heart obstruction cascade

Genetic Considerations

While most cases are sporadic, familial clustering suggests polygenic inheritance. NOTCH1 and other genes in the Notch-signalling pathway have been implicated in both BAV and CoA. Genetic counselling is recommended for affected families, with echocardiographic screening of first-degree relatives of CoA patients, particularly those with BAV.

Clinical Features & Diagnosis

Presentation by Age Group

Neonatal (Critical)

Duct-Dependent CoA

Cardiogenic shock, tachypnoea, poor feeding, mottled lower limbs, absent or weak femoral pulses, metabolic acidosis (lactate > 5 mmol/L). Differential includes hypoplastic left heart and interrupted aortic arch.

Setting: NICU — surgical emergency

Infant / Child

Late-Diagnosed CoA

Incidental finding of upper-limb hypertension (often > 95th centile), systolic murmur loudest at left scapula, radiofemoral delay, exercise-induced leg pain, or failure to thrive. Rib notching on CXR may be present after age 6.

Setting: Outpatient / Paediatric cardiology

Adult

Previously Undiagnosed or Post-Repair Residual

Resistant hypertension (often requiring ≥ 3 agents), headache, epistaxis, claudication, differential cyanosis (pre-ductal > post-ductal if PDA present), aortic regurgitation murmur (BAV), or incidental finding of rib notching on CXR.

Setting: Adult congenital heart disease clinic

Physical Examination Findings

Blood pressure: Upper-limb systolic BP > lower-limb systolic BP by ≥ 20 mmHg (normal: leg BP ~ 10–20 mmHg > arm BP). Four-limb blood pressure measurement is essential in all hypertensive children.
Pulse discrepancy: Delayed and diminished femoral pulses compared with radial/brachial pulses (radiofemoral delay).
Auscultation: Systolic ejection murmur maximal at left interscapular region posteriorly; continuous murmur if significant collaterals; ejection click if BAV present.
Bruits: Systolic or continuous bruit over collaterals in the back or chest wall.
Signs of BAV: Early-peaking systolic murmur at the right upper sternal border; aortic regurgitation diastolic murmur.
Turner syndrome stigmata: Short stature, webbed neck, low posterior hairline, broad chest with widely spaced nipples, cubitus valgus, lymphoedema of hands/feet.

Diagnostic Algorithm

1

Clinical Suspicion

Upper-limb hypertension, radiofemoral delay, systolic murmur at left scapula, or neonatal shock with absent femoral pulses.

2

Four-Limb Blood Pressure

Document arm-leg systolic gradient ≥ 20 mmHg. MBS item 11004 (paediatric consultation) may apply.

3

Transthoracic Echocardiography

First-line imaging — visualise isthmus, measure peak gradient, assess arch anatomy, BAV, LV function, associated lesions.

4

Cardiac MRI or CT

Gold-standard for 3D anatomy, collateral mapping, and post-repair surveillance. MRI preferred (no radiation); CT if MRI contraindicated.

5

Cardiac Catheterisation

Reserved for haemodynamic assessment (gradient confirmation) and interventional procedures (balloon/stent).

Investigations

Essential

Transthoracic Echocardiography (TTE)

First-line investigation. Identifies isthmus narrowing, measures continuous-wave Doppler gradient, assesses aortic arch morphology (hypoplastic vs discrete), evaluates BAV, LV hypertrophy, and associated intracardiac defects. Sensitivity > 95 % in neonates and infants; lower sensitivity in adults with poor acoustic windows.

Widely Available

Four-Limb Blood Pressure Measurement

Simultaneous arm and leg BP using age-appropriate cuffs. Arm-leg systolic gradient ≥ 20 mmHg is abnormal. Simple, non-invasive, and should be performed in all hypertensive children. MBS item 11005 (paediatric consultation with procedure).

Widely Available

Chest Radiography (CXR)

Rib notching (inferior borders of 3rd–8th ribs) from dilated intercostal collaterals — typically seen after age 6. "3 sign" (reverse figure-3) at the coarctation site. Cardiomegaly in infants with heart failure. Not diagnostic alone.

Essential — Gold Standard

Cardiac MRI (CMR)

Gold-standard for anatomical delineation, 3D reconstruction, gradient assessment by phase-contrast flow mapping, collateral visualisation, and aortic root measurement. Indicated in all patients post-repair and pre-intervention. Available at all major Australian paediatric and adult congenital centres. MBS item 63336 (cardiac MRI).

Widely Available

CT Angiography (CTA)

Alternative when MRI is contraindicated (pacemaker, severe claustrophobia). Rapid acquisition; excellent spatial resolution. Drawback: ionising radiation (dose ~2–5 mSv). Use low-dose protocols. MBS item 57353 (CT aorta).

Referral / Specialist

Cardiac Catheterisation & Angiography

Invasive haemodynamic assessment: simultaneous pressure measurement above and below the coarctation. Required when planning transcatheter intervention (balloon angioplasty or stent implantation). Also assesses pulmonary artery pressures, cardiac output, and coronary anatomy in adults.

Referral / Specialist

Magnetic Resonance Angiography (MRA) of Brain

Screening for Berry (intracranial) aneurysm, present in 5–10 % of CoA patients. Recommended at initial diagnosis in adolescents and adults, and prior to pregnancy counselling.

Referral / Specialist

Karyotype / Genetic Testing

Fluorescence in-situ hybridisation (FISH) or chromosomal microarray for Turner syndrome (45,X or mosaic) in all females with CoA. Consider NOTCH1 gene testing in familial BAV/CoA syndromes.

ℹ️

Australian availability note: Cardiac MRI is available in all state paediatric cardiac centres (RCH Melbourne, Westmead Sydney, QCH Brisbane, WCH Adelaide, PMH Perth, RHH Hobart, John Hunter Newcastle) and most adult tertiary centres. Ambulance Victoria and NSW Health have established inter-hospital transfer protocols for neonatal CoA emergencies.

Management

Initial Stabilisation (Neonatal Critical CoA)

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Emergency management: Prostaglandin E₁ (Alprostadil) 10–50 ng/kg/min IV continuous infusion to maintain ductal patency and restore lower-body perfusion. Intubate for respiratory failure. Correct acidosis with sodium bicarbonate. Inotropic support (dobutamine 5–10 mcg/kg/min ± milrinone) if cardiogenic shock. Urgent transfer to tertiary paediatric cardiac surgical centre.

Surgical Repair

Surgery is the preferred definitive treatment for neonates, infants, and young children with native coarctation, and for patients with complex arch anatomy or associated intracardiac lesions requiring concurrent repair.

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Extended End-to-End Anastomosis

Preferred technique · Neonates & infants

Indication Native CoA in neonates, infants, and children < 15 kg

Technique Resection of coarcted segment with extended end-to-end anastomosis, including part of the lesser curvature of the arch

Re-coarctation rate < 5 % (lowest of all techniques)

Mortality < 1 % at Australian centres (elective)

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Subclavian Flap Aortoplasty

Alternative technique · Long-segment narrowing

Indication Long-segment or transverse arch hypoplasia

Technique Left subclavian artery divided and opened longitudinally; flap used to augment the coarctation site

Limitation Sacrifices left subclavian artery; left arm perfusion via collaterals

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Patch Aortoplasty

Rarely used · Older children

Indication Selected cases with complex anatomy

Technique Dacron or pericardial patch to enlarge the narrowed segment

Limitation Higher risk of late aneurysm formation at patch site; largely superseded by extended end-to-end anastomosis

Transcatheter Intervention

Balloon angioplasty with or without stent implantation is the preferred approach for older children, adolescents, and adults with native coarctation or re-coarctation post-surgery. Procedures are performed in the cardiac catheterisation laboratory under general anaesthesia.

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Balloon Angioplasty

± bare-metal stent · Transcatheter

Indication Children > 25 kg, adolescents, adults with native or re-coarctation; gradient ≥ 20 mmHg

Technique Retrograde femoral artery access; balloon dilation ± bare-metal stent deployment

Immediate success Gradient reduction to < 10 mmHg in > 90 %

Complications Aortic wall injury, aneurysm (2–5 %), femoral artery thrombosis, stroke (rare)

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Covered Stent Implantation

Cheatham-Platinum stent · Adults & large adolescents

Indication Adults with native CoA, aneurysm at coarctation site, or post-surgical re-coarctation; vessels ≥ 18 mm anticipated diameter

Advantage Covered stent seals intimal tears and reduces aneurysm risk

PBS status Not PBS (hospital-funded prosthesis)

Choice of Intervention — Decision Framework

Patient Group	Preferred Intervention	Rationale
Neonate / Infant < 1 year	Surgery — extended end-to-end anastomosis	Small vessel size precludes stent; lowest re-coarctation rate; concomitant repair of VSD/PDA
Child 1–8 years / < 25 kg	Surgery preferred; balloon angioplasty for re-coarctation	Vessels too small for adult stents; surgery has durable results
Child > 8 years / > 25 kg	Balloon angioplasty ± stent	Sufficient vessel size; less invasive; rapid recovery
Adolescent / Adult	Stent implantation (covered stent preferred)	Excellent gradient reduction; lower complication rate than surgery in adults; covered stent reduces aneurysm risk
Re-coarctation post-surgery	Balloon angioplasty ± stent	Reoperation carries higher morbidity; transcatheter approach preferred
CoA with complex arch / Shone complex	Surgery (staged if necessary)	Requires arch reconstruction; transcatheter not feasible

Antihypertensive Pharmacotherapy

Hypertension persists in 25–70 % of patients after successful coarctation repair. Pharmacotherapy is essential and may be required lifelong. Beta-blockers are generally preferred as first-line agents.

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Atenolol

Noten® · Generic · Beta-1 selective blocker

Adult dose 25–100 mg PO daily

Paediatric dose 0.5–2 mg/kg/day PO (max 2 mg/kg/day)

Route / frequency Oral, once daily

Renal adjustment Reduce dose by 50 % if CrCl < 35 mL/min

PBS status ✔ PBS General Benefit

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Ramipril

Tritace® · Generic · ACE inhibitor

Adult dose 2.5–10 mg PO daily

Paediatric dose 0.05–0.2 mg/kg/day PO (limited data in children < 6 years)

Route / frequency Oral, once daily

Renal adjustment Start at 1.25 mg if CrCl < 30 mL/min; monitor K⁺ and creatinine

PBS status ✔ PBS General Benefit

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Losartan

Cozaar® · Generic · ARB

Adult dose 50–100 mg PO daily

Paediatric dose 0.7 mg/kg/day PO (max 50 mg/day) — for children ≥ 6 years

Route / frequency Oral, once daily

Renal adjustment No specific dose adjustment; monitor K⁺

PBS status ✔ PBS General Benefit

⚠️

Contraindication — pregnancy: ACE inhibitors (ramipril, enalapril) and ARBs (losartan, valsartan) are teratogenic and must be discontinued prior to conception. Switch to methyldopa, labetalol, or nifedipine in women of childbearing potential. Document in patient medication list and My Health Record.

Special Populations

🤰 Pregnancy

Pre-pregnancy optimisation

All women with CoA should undergo pre-conception assessment by an adult congenital heart disease (ACHD) cardiologist. Repair of significant residual coarctation or gradient ≥ 20 mmHg recommended prior to pregnancy. Counsel regarding aortic dissection risk (highest in Turner syndrome and unrepaired CoA).

Antihypertensive switch

Discontinue ACE inhibitors / ARBs. First-line: methyldopa 250 mg PO TDS (titrate to max 3 g/day) or labetalol 100 mg PO BD (titrate to max 1.2 g/day). Nifedipine MR 30–60 mg PO daily is second-line. PBS: all general benefit.

Monitoring

Serial echocardiography each trimester; MRI (no gadolinium) if worsening symptoms. Multidisciplinary care involving obstetrics, cardiology, and anaesthesia. Delivery at tertiary centre with cardiac surgical capability. Vaginal delivery preferred with epidural analgesia and invasive BP monitoring.

Risk stratification

mWHO II (repaired, no residual gradient) or mWHO II–III (residual gradient or Turner syndrome). Turner syndrome carries highest dissection risk — consider prophylactic aortic root surgery if diameter > 27 mm/m² BSA prior to pregnancy.

👶 Paediatrics

Neonatal critical CoA

Prostaglandin E₁ infusion to maintain ductal patency; surgical repair (extended end-to-end anastomosis) within first 1–2 weeks of life at tertiary paediatric cardiac centre. Operative mortality < 1 % at Australian centres.

Growth and development

Monitor weight, length/height, and head circumference. Turner syndrome: consider growth hormone therapy from age 4–6 (somatropin, PBS Authority Required). Coordinate with paediatric endocrinology.

Exercise recommendations

Post-repair with no residual gradient: no restrictions. Residual gradient > 20 mmHg: avoid competitive isometric sports; guided by 36th Bethesda Conference / AHA/ACC 2015 guidelines.

Transition to adult care

Structured transition programme from age 12–16; formal handover to ACHD service by age 18. Risk of loss to follow-up is highest during adolescence — use recall systems and digital health reminders.

👴 Elderly / Late Presentation

Late-diagnosed adult CoA

Patients presenting in the 4th–6th decade with resistant hypertension, claudication, or heart failure. Stent implantation is preferred over surgery in adults due to lower morbidity. Concurrent coronary artery disease is common — assess coronary arteries during catheterisation.

Arterial stiffness

Even after successful repair, adults exhibit increased aortic stiffness, LV diastolic dysfunction, and earlier-onset atherosclerosis. Aggressive cardiovascular risk factor management (statin, aspirin per ACS guidelines) is warranted.

🫘 Renal Impairment

ACE inhibitors / ARBs

Use with caution in renal impairment. Start low, monitor serum creatinine and potassium within 1–2 weeks of initiation. Avoid in bilateral renal artery stenosis. Atenolol: reduce dose if CrCl < 35 mL/min.

Contrast nephropathy

Pre-hydration with isotonic saline before cardiac catheterisation / CT angiography if eGFR < 45 mL/min/1.73 m². Use low-osmolar or iso-osmolar contrast. MRI with gadolinium — avoid gadolinium-based agents if eGFR < 30 (gadolinium-associated nephrogenic systemic fibrosis risk).

🫁 Hepatic Impairment

Antihypertensives

Ramipril and losartan are hepatically metabolised — start at lower doses and titrate cautiously in hepatic impairment. Labetalol: avoid in severe hepatic disease (reduced first-pass metabolism, increased bioavailability).

🛡️ Infective Endocarditis Prophylaxis

Indications

IE prophylaxis is not routinely recommended for isolated repaired CoA (per ESC 2015 and AHA 2007 guidelines). However, prophylaxis is indicated if: (1) prosthetic material used for repair, (2) prior IE, (3) unrepaired cyanotic CHD, or (4) BAV with regurgitation. Align with current Australian RACGP/Heart Foundation guidance.

Regimen (if indicated)

Amoxicillin 50 mg/kg (max 2 g) PO 1 hour before dental procedure. If penicillin-allergic: clindamycin 20 mg/kg (max 600 mg) PO. All PBS general benefit.

Aboriginal and Torres Strait Islander Health Considerations

Aboriginal and Torres Strait Islander Health

Epidemiology & burden

Congenital heart disease prevalence in Aboriginal and Torres Strait Islander neonates is higher than in the non-Indigenous population (AIHW 2023). Delayed presentation of coarctation — particularly in remote communities — results in end-organ damage (LV hypertrophy, hypertensive retinopathy, nephropathy) before diagnosis. Earlier screening is essential.

Remote access challenges

Specialist paediatric and adult congenital cardiac services are concentrated in major capital cities. Telehealth echocardiography (store-and-forward or live) through the Royal Flying Doctor Service (RFDS) and Aboriginal Community Controlled Health Organisations (ACCHOs) can facilitate early detection. Consider screening four-limb BP in remote paediatric health checks (Healthy Kids Check).

Culturally safe care

Engage Aboriginal Health Workers and Liaison Officers in pre- and post-operative counselling. Provide culturally appropriate health education materials (including in First Nations languages where relevant). Use Aboriginal Interpreting Services for informed consent discussions. Respect family decision-making structures and kinship obligations.

Travel & logistics

Patients from remote NT, WA, QLD, and SA communities require assisted travel (Patient Assisted Travel Scheme — PATS) for cardiac surgery and interventional procedures. Ensure accommodation, transport, and social support are arranged prior to admission. Coordinate with Patient Travel Assistance Schemes in each jurisdiction.

Follow-up adherence

Loss to follow-up is a major risk post-repair. Utilise the Closing the Gap PBS co-payment measure to reduce medication costs. Embed recall systems in ACCHOs (Best Practice, Communicare). Link with state-based congenital heart disease registers for long-term tracking.

Turner syndrome recognition

Karyotyping may be delayed in remote settings. Train primary care providers to recognise Turner syndrome stigmata in young females with hypertension. Ensure timely genetic referral and long-term endocrine follow-up (growth hormone, thyroid function).

📚 References

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