Coarctation of the aorta: symptoms, diagnosis and treatment

Coarctation of the aorta is a congenital narrowing of the aortic lumen, most commonly in the isthmus immediately behind the left subclavian artery (the former ductus arteriosus). This "threshold" causes increased pressure in the upper half of the body and decreased pressure in the lower half, leading to the development of collateral vessels, and with age, arterial hypertension and left ventricular overload. Without treatment, the risk of cardiovascular complications is high, but modern surgical and catheter-based techniques can effectively eliminate the narrowing and improve the prognosis. [1]

In infants, severe coarctation can present with a critical condition following closure of the ductus arteriosus: cardiogenic shock, metabolic acidosis, cold feet, and weakened femoral artery pulsations. Older children and adults are more likely to experience hypertension (often "young"), headaches, pulsating sensations in the arms, decreased exercise tolerance, and a murmur in the interscapular region. Classic clinical clues include a difference in blood pressure and pulse in the arms and legs. [2]

The anatomical form varies, from a short "isthmus" to a long, hypoplastic segment of the arch and descending aorta. Coarctation is often combined with other defects, such as bicuspid aortic valve, ventricular septal defect, and arch anomalies. It is the anatomy that determines the choice of intervention: in infants, surgery is more common; in adolescents and adults, stenting is predominant. [3]

Even after successful correction, patients remain at risk: persistent or "masked" hypertension, recoarctation, aneurysms in the intervention/arch area, and (according to American guidelines) an increased risk of intracranial aneurysms. Therefore, lifelong follow-up with specialists in congenital heart disease, including regular aortic imaging, is required. [4]

Code according to ICD-10 and ICD-11

In ICD-10, coarctation of the aorta is coded as Q25.1. This code covers congenital narrowing of the aorta, including pre- and postductal variants. Separate codes within Q25 exist for the documentation of related conditions (e.g., interrupted aortic arch). [5]

In ICD-11, coarctation of the aorta is classified under code LA8B.21. ICD-11 texts indicate that the stenosis is usually located distal to the left subclavian artery, but may also occur in other parts of the thoracic/abdominal aorta. Post-coordination (e.g., combined lesions of the arch) is allowed for clarification. [6]

Table 1. Codes for coarctation of the aorta

Classifier	Code	Name
ICD-10	Q25.1	Coarctation of the aorta
ICD-11	LA8B.21	Coarctation of the aorta
ICD-10 (related)	Q25.0-Q25.4	Defects of large arteries (for differentiation)

Epidemiology

Coarctation of the aorta accounts for approximately 5-8% of all congenital heart defects; the birth incidence is approximately 3-5 per 10,000 live births. The condition is more common in boys (ratio approximately 2:1) and is often associated with bicuspid aortic valve.[7]

Coarctation is a common cause of "juvenile" hypertension. Even after early radical treatment, up to 40-55% of adults may remain hypertensive after 20 years, requiring active screening and treatment of risk factors. [8]

In adults who have undergone correction, repeat interventions (recoarctation, aneurysm) are common, so cohort studies emphasize the need for lifelong monitoring and periodic tomographic imaging. [9]

Some guidelines recommend screening for intracranial aneurysms at least once; however, there are differences between US and European guidelines, which are discussed below (see Differential Diagnosis/Monitoring).[10]

Reasons

Embryologically, coarctation is associated with atypical remodeling of the aortic arch and "ingrowth" of ductus arteriosus tissue into the aortic wall; after birth and closure of the ductus, this tissue contracts and forms a narrowing. The degree and extent of the narrowing vary, from a short "belt" to diffuse arch hypoplasia. [11]

Associated anomalies are the result of common mechanisms of left heart development: bicuspid aortic valve, subaortic stenosis, and ventricular septal defect are common. The presence of associated defects determines early hemodynamics and the timing of intervention. [12]

Genetic syndromes: Coarctation is found in 10-20% of patients with Turner syndrome. Familial clusters and associations with other "left-sided" defects have been described, but there is no routine "single" genetic test for isolated coarctation.[13]

In some patients, the lesion is extensive or multiple (arch + descending aorta), which complicates the choice between surgery and stenting and requires 3D planning. [14]

Risk factors

Early symptomatic manifestation in newborns is associated with extensive arch hypoplasia and rapid ductus closure. High risk of decompensation occurs when combined with a large ventricular septal defect. [15]

In children and adults, persistent or masked arterial hypertension is a key factor in an unfavorable course. Even with an "ideal" gradient after correction, up to 45% of children have hidden hypertension, according to 24-hour monitoring. This explains the need for regular ambulatory monitoring. [16]

The risk of late complications is increased by a long coarctation segment, severe collateralization, insufficient dilation during balloon angioplasty without a stent, and concomitant aortic valve pathology. [17]

In adults, traditional risk factors for atherosclerosis, such as dyslipidemia, smoking, and excess weight, play a significant role. In cohorts of patients with coarctation, an increased incidence of coronary artery disease has been described compared to the general population. [18]

Pathogenesis

Mechanical obstruction creates chronic afterload on the left ventricle, causing hypertrophy and decreased compliance, and a characteristic systemic blood flow profile: high pressure proximal to the narrowing and low pressure distal to it. Over time, endothelial dysfunction and increased arterial stiffness develop. [19]

Collaterals (intercostal and scapular arteries) compensate for distal perfusion but maintain high turbulence and the risk of aneurysmal changes. Radiographs may show a "notch" in the arch ("number 3 sign") and rib erosion due to hyperplasia of the intercostal arteries. [20]

Even after gradient elimination, vascular changes may persist (“post-coarctation vasculopathy”), so blood pressure control remains a key component of lifelong management. This explains the incomplete reversibility of hypertension in some patients. [21]

Due to the association with the bicuspid aortic valve and arch involvement, dilation/aneurysm of the ascending aorta is possible; periodic tomographic evaluation of the entire thoracoabdominal segment is required.[22]

Symptoms

In newborns: pallor, weak sucking, tachypnea, cold extremities, metabolic acidosis; weakened or absent femoral pulse; sometimes a murmur in the interscapular region. The condition often manifests after closure of the ductus arteriosus. [23]

In children/adolescents: headaches, nosebleeds, exercise intolerance, muscle pain in the legs when running ("intermittent claudication"), back noise. On examination, there is a difference in pressure between the arms and legs, increased pulsation in the arms, weak pulsation in the feet. [24]

In adults: persistent hypertension since adolescence, decreased endurance, cardiac pain; sometimes asymptomatic until incidental discovery on CT/MRI. Complications may gradually develop, including aortic dilation, aneurysms, and coronary artery disease. [25]

Objectively: systolic murmur in the interscapular region, delayed and weakened femoral pulse, difference in systolic blood pressure between the arm and leg. These signs require immediate instrumental verification. [26]

Classification, forms and stages

Based on anatomy, a distinction is made between short "isthmic" stenosis, long segmental stenosis, and hypoplasia of the arch/descending aorta; abdominal coarctation is also encountered (rarely). The choice of intervention method and the risk of complications depend on anatomy. [27]

By age and tactics: in newborns/infants, surgical treatment predominates; in adolescents and adults, endovascular stenting (including covered stents) is the first-line method with suitable anatomy. [28]

By course: native coarctation; condition after correction (with risks of recoarctation, aneurysm, persistent hypertension). Each condition has its own monitoring indicators and indications for reintervention. [29]

Table 2. Practical classification of coarctation of the aorta

Axis	Options	What determines
Anatomy	Short/long/hypoplasia of the arch	Type of intervention (surgery vs. stent)
Age	Newborn/infant/teen/adult	Method and access
Status	Native / after correction	Observation schedule and reintervention thresholds

Complications and consequences

Untreated coarctation leads to heart failure, hypertensive crises, aortic ruptures/dissections, and intracranial hemorrhage. Early detection and correction reduce the risks but do not negate lifelong monitoring. [30]

After correction, risks remain: persistent or masked hypertension, recoarctation, aneurysm in the intervention area, dilation of the ascending aorta, and coronary artery disease. Strict blood pressure control and interval tomographic imaging reduce the incidence of events. [31]

In adult cohorts after successful repair, the following rates are reported: hypertension - up to 48%, recoarctation - about 26%, aortic dilation - about 14% with long-term follow-up. These figures illustrate the need for active follow-up. [32]

On the issue of intracranial aneurysms, the positions diverge: the AHA/ACC support screening, while the ESC-2020 does not routinely recommend it; the decision is made individually taking into account risk factors. [33]

When to see a doctor

Immediately - in case of sudden weakness, pre-syncope or syncope, acute chest/back pain (suspected aortic dissection), severe shortness of breath, or cold feet in the infant after discharge from the hospital. These are indications for emergency assessment. [34]

In the coming days - with new or increasing noise in the back, increasing pressure difference in the arms and legs, increased frequency of headaches/nosebleeds, identified “young” hypertension. [35]

Planned - for all patients with confirmed or corrected coarctation: blood pressure monitoring in the arms and legs at each visit, periodic echocardiography and tomographic imaging according to the schedule (see Table 6). In adolescents and adults - screening for "masked" hypertension based on 24-hour monitoring data. [36]

Discuss sports and pregnancy separately with your doctor: intense strength training is limited in cases of uncontrolled hypertension or aortic dilation; pregnancy in women with coarctation requires monitoring in a specialized center. [37]

Diagnostics

The first step is clinical screening: measuring blood pressure in all extremities, comparing pulses, and auscultating the interscapular region. A gradient between the arms and legs of ≥20 mmHg is an alarming sign and a reason for in-depth imaging. [38]

The second step is echocardiography: it confirms the stenosis and evaluates the degree, flow gradients, left ventricular function, and associated defects. In adolescents and adults, the acoustic windows are limited—a "tomographic portrait" of the arc is needed. [39]

The third step is CT angiography or MR angiography: these are mandatory at least once for each patient (before or after correction) and then periodically to monitor the repair area, the arch, and the entire thoracoabdominal aorta. In adults, cross-sectional imaging is recommended every 3-5 years after correction. [40]

Step 4: Catheterization with manometry: the "gold standard" for accurate peak gradient measurement and simultaneous treatment (balloon/stent). Used in cases of diagnostic uncertainty or planning of catheter intervention. [41]

Table 3. Diagnostic supports

Stage	What are we looking for?	For what
Screening	Arm-leg pressure difference, weakening of femoral pulse	Selection for visualization
Echocardiography	Degree of narrowing, Doppler gradient, LV	Basic assessment
CT/MR angiography	Anatomy of an aneurysm repair/arc	Planning and monitoring
Catheterization	Invasive gradient, possibility of immediate treatment	When stenting is planned

Differential diagnosis

In infants, coarctation is differentiated from critical left atrial tract defects (intermittent arch, severe subaortic/aortic stenosis), which also cause shock and acidosis after ductal closure. The key is angiography/CT/MRI of the arch and assessment of anatomy. [42]

In children/adults, it is important to differentiate coarctation from other causes of secondary hypertension in young adults: fibromuscular dysplasia of the renal arteries, parenchymal nephropathy, and endocrine causes. Arm-leg pressure differences and interscapular murmurs are typical of coarctation. [43]

It is important to remember the comorbidities of patients with coarctation: bicuspid valve and dilated ascending aorta. These are not "differential diagnoses," but factors that change the tactics and frequency of imaging. [44]

A separate issue is intracranial aneurysms: AHA/ACC support at least one examination (MRA), while ESC-2020 does not routinely do so. The approach is chosen individually, taking into account family history, smoking, and uncontrolled hypertension. [45]

Table 4. How coarctation differs from other causes of “young” hypertension

Sign	Coarctation of the aorta	Renal/endocrine causes
The difference between SAD and leg	Often ≥20 mmHg	No
Femoral artery pulse	Weakened/delayed	Normal
Noise in the interscapular region	Often	No
Tomography of the aortic arch	Narrowing/collaterals	No special features

Treatment

Indications for intervention include a peak-to-peak gradient across the coarctation of ≥20 mmHg based on catheterization; or a smaller gradient in the presence of hypertension, evidence of significant anatomical coarctation with significant collateral flow, left ventricular dysfunction, or prolonged unloading time during exercise. The decision is made by a multidisciplinary team at the congenital heart disease center. [46]

In neonates and infants, surgery is preferred (resection with end-to-end anastomosis, expansion grafting, arch reconstruction). Balloon dilation is considered to a limited extent in this group (as a "bridge" in critical conditions), due to the higher risks of aneurysm and restenosis with isolated dilation without a stent. [47]

In adolescents and adults, stenting (including covered stents for fragile walls/pseudoaneurysms/long segments) is the first-line treatment option with suitable anatomy. Modern case series and meta-analyses confirm high efficacy, low periprocedural complications, and favorable mid-term outcomes. [48]

The goal of the intervention is to achieve a residual gradient of <20 mmHg and an adequate aortic diameter for age/height. In cases of a long hypoplastic segment or concomitant arch pathology, surgical reconstruction is sometimes preferable, whereas a “short isthmus” is easily stented. [49]

Blood pressure monitoring is essential before and after correction: beta-blockers, angiotensin-converting enzyme inhibitors, or angiotensin receptor blockers are first-line drugs. Even with a good anatomical result, some patients remain hypertensive and require long-term therapy. [50]

Ambulatory blood pressure monitoring helps identify "masked" hypertension (in up to 45% of children after repair). In adolescence and adulthood, stress tests are useful for assessing the hypertensive response. An "aggressive" strategy for controlling risk factors (body weight, lipids, smoking) is standard care. [51]

After stenting, patients <30 kg are often scheduled for "redilation" as they grow; in adolescents/adults, redilation is less common. The choice of a covered stent reduces the risk of rupture/dissection and is useful for long/rigid lesions or concomitant aortic wall defects. [52]

In adults, surgery remains an important option for long lesions, severe arch hypoplasia, associated aneurysm, poorly positioned collaterals, and when simultaneous correction of valvular/coronary/aortic pathology is required. Surgery should be performed in an experienced congenital anomaly center. [53]

Post-procedure follow-up includes annual visits, echocardiography, periodic tomographic imaging of the arch/repair site (usually every 3-5 years in adolescents/adults), 24-hour blood pressure monitoring every 1-2 years, and exercise tolerance assessment. This follows from both the 2023 ACC clinical algorithms and the 2023 reviews. [54]

A special topic is screening for intracranial aneurysms. Modeling and observational studies support the AHA/ACC recommendation for screening (MRA/CTA) at least once in adults with coarctation; the ESC-2020 does not require routine screening. A practical compromise is to discuss screening with the patient, taking into account family history and smoking. [55]

Table 5. Treatment methods: strengths and limitations

Method	Pros	Cons/risks	Who is it most suitable for?
Surgery (newborns/infants)	Radicality, arc correction	Risk of arch reconstruction, cicatricial changes	Newborns, long hypoplasia
Balloon dilation	Fast as a bridge	Higher risk of aneurysm/restenosis without a stent	Critically ill infants
Stenting (including covered)	High efficiency, low trauma	Remediation is needed during growth; CT/MRI monitoring	Teenagers and adults

Prevention

Primary prevention of coarctation itself is impossible; however, the risk of complications can be reduced. The basis is early diagnosis in infants (foot pulse screening, blood pressure measurement) and timely referral to a congenital anomalies center. [56]

Secondary prevention of complications in all patients includes blood pressure control, risk factor correction, routine imaging of the aorta and repair area (CT/MR angiography), and patient and family education on the signs of decompensation. [57]

Before engaging in strength sports in adolescents/adults, ensure there is no significant aortic gradient/dilation. In cases of aortic pathology, explosive loads are limited; in stable conditions, aerobic training with an individualized plan is permitted. [58]

Women with coarctation and/or aortic dilatation require preconception consultation with a multidisciplinary team and follow-up during pregnancy. [59]

Forecast

Modern interventions ensure high survival rates and a good quality of life. The prognosis is most significantly influenced by timely correction, blood pressure control, and organized lifelong monitoring with tomographic imaging. [60]

Even with anatomically successful repair, some patients remain hypertensive due to persistent vascular changes; therefore, treatment goals include not only “removing the gradient” but also achieving target BP levels. [61]

In long-term cohort studies, significant rates of hypertension, recoarctation, and aortic dilation have been reported after repair, highlighting the value of surveillance protocols and timely reinterventions. [62]

New data (2023-2025) support a 3-5 year cross-sectional imaging interval in adolescents/adults and an emphasis on identifying masked AVMs (AVMs every 1-2 years). This helps to "catch" problems before symptoms occur. [63]

FAQ

1) When is treatment indicated?
With a peak-to-peak gradient ≥20 mmHg (catheterization) - definitely; with a smaller gradient - if there is hypertension, pronounced collaterals, or significant anatomical narrowing. The choice of method depends on age and anatomy. [64]

2) Which is better: surgery or a stent?
In infants, surgery is more often the preferred treatment; in adolescents and adults, stenting is recommended, especially with a short isthmus. Long lesions of the arch/descending aorta and associated aneurysms often lead to the choice of surgery. [65]

3) Why does hypertension persist even after "perfect" correction?
It's due to long-term vascular remodeling and increased arterial stiffness. Therefore, all patients need a blood pressure control plan: lifestyle changes plus antihypertensive medications. [66]

4) Should intracranial aneurysms be sought?
AHA/ACC - "yes, at least once" (MRA/CTA), ESC-2020 - "routinely no." The decision is individualized based on risks. [67]

Tables for practice

Table 6. Observation after coarctation correction

Component	Interval	Comment
Visit to the cardiologist (VPS)	Once every 12 months	More often with complaints/high blood pressure
Echocardiography	Once every 12 months	Gradients, LV, valves
CT/MR angiography	Every 3-5 years	Arch, repair zone, aneurysms
24-hour blood pressure monitoring	Every 1-2 years	Search for "masked" AG
Load testing	According to the readings	Hypertensive response

Table 7. Thresholds for intervention

Indicator	Threshold	Source
Invasive peak-to-peak gradient	≥20 mmHg	AHA/ACC reviews
Gradient <20 mm + AG/collaterals/significant coarctation	Consider intervention	AHA/ACC
Residual gradient after treatment	<20 mmHg	Clinical practice

Table 8. Antihypertensive therapy for coarctation

Class	When we choose	Comments
Beta blocker	Young, tachycardia, concomitant. aorta dilatation	Often a starting option
ACE inhibitor	LV hypertrophy, metabolic profile	Potassium/creatinine monitoring
Angiotensin receptor blocker	Alternative to ACE inhibitor	When coughing on an ACE inhibitor
Calcium antagonists/thiazides	Addition	According to AG standards

Table 9. Cross-sectional visualization: what to write in the conclusion

Segment	What to evaluate	Why is it important?
Arc and isthmus	Minimum diameter, constriction length	Catheter/surgical plan
Repair area/stent	Residual stenosis, endolysis, aneurysm	Decision on re-intervention
Ascending/descending aorta	Dilation/aneurysms	Sports tactics, pregnancy
Collaterals	Development, guiding arteries	Risk of bleeding during interventions

Table 10. ICD codes for case documentation

Scenario	ICD-10	ICD-11
Coarctation of the aorta	Q25.1	LA8B.21
Intermittent aortic arch (for differential accounting)	Q25.21/Q25.29	to be confirmed by LA8B.*