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Congenital mitral valve anomalies, from parachute valve to Shone complex, and how UK CHD centres approach repair.

Rare but complex: a stepped assessment, valve-sparing surgical repair where possible and lifelong follow-up at a specialist adult congenital heart disease centre.

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A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Editorial team

    Written by our editorial team from the UK sources listed on each page.

  • 02

    Sourced from guidance

    Checked against ESC adult congenital heart disease guidance, NHS specialist commissioning standards and peer-reviewed sources.

  • 03

    Current for 2026

    Reflects modern UK CHD centre practice, valve-sparing repair principles and lifelong ACHD follow-up.

Key facts

Congenital mitral valve disease at a glance.

The essentials, in plain English: the main patterns, associated syndromes and how UK CHD centres approach diagnosis and repair.

  • What it is

    A group of rare structural mitral valve problems present from birth, accounting for less than 1% of congenital heart disease but often complex.

  • Main patterns

    Stenosis (supravalvar ring, valvar fusion, parachute valve, arcade, subvalvar), regurgitation (clefts, chordal rupture, dysplasia), prolapse, mixed disease and Shone complex.

  • Associations

    Marfan, Loeys-Dietz, vascular Ehlers-Danlos, Down syndrome (partial AVSD with cleft), Turner and Williams syndromes.

  • How it shows

    From neonatal heart failure and pulmonary hypertension to an incidental murmur or exercise intolerance in the older child.

  • Cornerstone imaging

    Echocardiography is the gold standard, supported by TOE, 3D echo, cardiac MRI, CT and selective catheterisation.

  • Treatment principle

    Valve-sparing surgical repair whenever possible, with replacement reserved for irreparable disease and lifelong ACHD follow-up.

Why this guide matters

Rare, complex and highly treatable in the right hands.

Fewer than 1% of congenital heart disease cases, but often anatomically challenging. Three principles shape modern UK care.

  • Repair beats replacement

    Valve-sparing surgery preserves growth potential, avoids lifelong anticoagulation and generally gives better long-term outcomes.

  • Anatomy drives the plan

    Detailed 3D echo, cardiac MRI and MDT review at a specialist CHD centre align the operation with the specific lesion.

  • Follow-up is lifelong

    Transition to an adult congenital heart disease centre matters for surveillance, arrhythmia care and pregnancy planning.

How the diagnosis is made

From first murmur to a surgical plan.

The steps a UK paediatric or adult congenital cardiologist follows, in order, so families know what to expect and why.

  1. 01

    Assessing

    Murmur or symptoms noted

    A neonatal or antenatal referral, an incidental murmur or exercise intolerance triggers cardiology assessment.

  2. 02

    Assessing

    ECG and chest X-ray

    Look for left atrial enlargement, pulmonary oedema and rhythm changes such as atrial fibrillation in older patients.

  3. 03

    Assessing

    Transthoracic echo

    The gold standard: valve anatomy, gradient, regurgitation, left atrial size, ventricular function and associated defects.

  4. 04

    Confirming

    3D echo and TOE

    Detailed leaflet, chordal and papillary muscle anatomy for surgical planning, especially in complex repairs.

  5. 05

    Confirming

    Cardiac MRI and CT

    MRI quantifies ventricular volumes and regurgitant fraction; CT maps complex anatomy and adjacent structures.

  6. 06

    Preparing

    Catheterisation when needed

    Reserved for haemodynamic detail and pulmonary vascular resistance before surgery or transcatheter treatment.

  7. 07

    Preparing

    Genetics and MDT review

    FBN1, TGFBR1/2, COL3A1 testing where connective tissue disease is suspected, with cascade screening and specialist CHD MDT.

Typical pathway: first assessment to a settled surgical plan within weeks at a specialist CHD centre.

Symptoms

What congenital mitral valve disease actually looks like.

From neonatal heart failure and pulmonary hypertension to an incidental murmur in an otherwise well child, and the features that mean urgent review.

  • Neonatal heart failure

    Tachypnoea, poor feeding, sweating and failure to thrive in the first weeks of life.

  • Pulmonary hypertension

    Raised pressures with secondary right heart strain and hepatomegaly, especially in severe stenosis.

  • Exercise intolerance

    Older children and teenagers describe breathlessness, fatigue and reduced stamina compared with peers.

  • Palpitations and arrhythmia

    Atrial fibrillation and flutter appear as the left atrium dilates, particularly in adolescents and adults.

  • Diastolic murmur at apex

    A low-pitched mid-diastolic murmur points to inflow obstruction across a stenotic mitral valve.

  • Pansystolic radiating to axilla

    The classic murmur of mitral regurgitation, often loudest at the apex and radiating laterally.

  • Incidental finding

    Some children are entirely asymptomatic and detected on routine examination or echo for another reason.

  • Red flag: pulmonary oedema

    Severe respiratory distress with orthopnoea or an infant unable to feed needs urgent cardiology review.

Treatment

How congenital mitral valve disease is treated in the UK.

Medical therapy, valve-sparing surgical mitral valve repair, replacement where repair is not possible, and highly selective transcatheter options, coordinated across specialist CHD centres.

  • Medical therapy

    Diuretics, ACE inhibitors and beta blockers to manage heart failure, control arrhythmia and support growth.

  • Valve-sparing surgical repair

    Commissurotomy, chordal shortening, annuloplasty, leaflet extension and resection of a supravalvar ring, preserving the native valve.

  • Mitral valve replacement

    Mechanical or bioprosthetic valves reserved for irreparable disease, balancing anticoagulation, durability and future reoperation.

  • Transcatheter approaches

    Highly selective: Melody transcatheter valve in the mitral position and edge-to-edge repair in rare paediatric or ACHD scenarios.

  • Staged repair for Shone complex

    Sequential correction of parachute valve, supravalvar ring, subaortic membrane and coarctation across multiple procedures.

  • Anticoagulation

    Warfarin for mechanical valves and for atrial fibrillation; direct oral anticoagulants are not used with mechanical prostheses.

  • Heart transplantation

    A last resort for end-stage disease where repair or replacement is not feasible, coordinated through a specialist transplant centre.

  • Lifelong ACHD follow-up

    Structured transition to an adult congenital heart disease centre, with pregnancy, exercise and endocarditis counselling.

Specialist UK CHD centres include Great Ormond Street, Evelina London, Bristol, Southampton, Birmingham, Alder Hey, Newcastle Freeman, Leeds, Glasgow and Belfast. Family support is available through the British Heart Foundation and the Marfan Association UK.

What this guide is based on

The sources behind every claim on this page.

UK and international specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your paediatric or adult congenital cardiologist knows your history and imaging and can tell you which parts apply to you. If in doubt, get seen.

  • ESC. 2020 Guidelines for the management of adult congenital heart disease.

  • NHS England. Specialised commissioning: paediatric and adult congenital heart disease services.

  • AHA/ACC. Guideline for the management of patients with valvular heart disease.

  • British Congenital Cardiac Association. Standards for paediatric and adult congenital cardiac services.

Red flags

When congenital mitral valve disease needs urgent attention.

Much of the work is elective, planned surveillance. These are the situations that are not, and where specialist review cannot wait.

  • Neonatal cardiogenic shock

    A cold, mottled baby with poor feeding and respiratory distress needs immediate neonatal and cardiac assessment.

  • Severe pulmonary hypertension

    Long-standing severe mitral disease can raise pulmonary pressures irreversibly and change surgical options.

  • New atrial fibrillation

    A dilating left atrium may trigger AF, raising stroke risk and calling for anticoagulation and rhythm review.

  • Endocarditis features

    Fever, new murmur or embolic signs in a child with a known valve lesion needs urgent blood cultures and echo.

  • Aortic root dilatation in Marfan

    A connective tissue disease flag: coordinated aortic and mitral surveillance is essential.

  • Failed repair or worsening gradient

    Rising gradients or recurrent regurgitation on follow-up echo should prompt an early MDT discussion.

  • Pregnancy in moderate or severe disease

    Needs specialist maternal cardiology planning well before conception, not after a positive test.

  • Suspected connective tissue disease

    Tall stature, joint hypermobility or a family history warrants genetic assessment and cascade screening.

  • Uncontrolled heart failure symptoms

    Escalating breathlessness, orthopnoea or unexplained weight gain calls for urgent cardiology review.

Living with it

A lifelong condition, with a clear pathway.

Four things that make the biggest difference: stay linked to specialist care, exercise with a plan, plan pregnancy in advance and look after dental and infection risks.

A quiet reminder

Continuity of care matters more than any single visit.

A steady relationship with an ACHD centre catches subtle change early and keeps decisions based on your whole story, not a snapshot.

  1. 01 Follow-up

    Stay linked to an ACHD centre

    Lifelong review at a specialist adult congenital heart disease service catches subtle changes early.

  2. 02 Activity

    Individualised exercise advice

    Most people can exercise safely, but the plan depends on valve lesion severity and any prosthesis.

  3. 03 Family

    Plan pregnancy in advance

    Pre-pregnancy counselling with maternal cardiology sets a safer path through pregnancy and delivery.

  4. 04 Prevention

    Dental and infection care

    Good dental health and prompt treatment of infection reduce endocarditis risk, with prophylaxis where indicated.

Frequently asked

Everything we get asked about congenital mitral valve disease.

Quick answers on types, testing, repair versus replacement and lifelong ACHD care.

  • What are congenital mitral valve anomalies?

    They are structural problems of the mitral valve present from birth, ranging from stenosis (supravalvar ring, valvar fusion, parachute valve, arcade, subvalvar tissue) to regurgitation from clefts, dysplastic leaflets or chordal rupture, mitral valve prolapse in connective tissue disease and mixed patterns. Shone complex describes multiple left-sided lesions together.

  • How common are they?

    They are rare, accounting for less than 1% of congenital heart disease, but they are often surgically complex and can be part of wider syndromes such as Marfan, Loeys-Dietz, vascular Ehlers-Danlos, Down syndrome (partial AVSD with a mitral cleft), Turner syndrome and Williams syndrome.

  • How is the diagnosis made?

    Echocardiography is the gold standard, supported by ECG and chest X-ray, 3D echo and transoesophageal echo for detailed anatomy, cardiac MRI for volumes and regurgitant fraction, CT for planning and selective catheterisation for haemodynamics and pulmonary vascular resistance. Genetic testing is offered when connective tissue disease is suspected.

  • Is surgery always needed?

    No. Mild disease can be watched with regular echo and clinical review. When surgery is needed, valve-sparing repair is preferred wherever possible because it preserves growth potential, avoids lifelong anticoagulation and generally gives better long-term outcomes than replacement.

  • What about valve replacement in children?

    Replacement is reserved for irreparable disease. Mechanical valves are durable but need lifelong warfarin (direct oral anticoagulants are not used with mechanical prostheses), while bioprosthetic valves avoid warfarin but degenerate and typically need reoperation. Small annulus size and growth make replacement especially challenging in young children.

  • What follow-up is needed as an adult?

    Lifelong review at a specialist adult congenital heart disease (ACHD) centre, with echo surveillance, arrhythmia and heart failure care, exercise counselling, pregnancy planning for women, endocarditis prevention and coordinated care with genetics where a connective tissue disease has been identified.

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