Skip to main content

Heart condition

Aortic valve regurgitation, from a leaky leaflet to a modern valve or root operation.

A backflow leak through the aortic valve. This guide covers the leaflet and root causes, how severity is graded on echo and cardiac MRI, and the guideline triggers for valve or root surgery.

Also known as aortic regurgitation. Read our primary short-form guide at /conditions/aortic-regurgitation.

Jump to treatment
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/EACTS 2021 and AHA/ACC 2020 valvular heart disease guidelines you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including cardiac MRI quantification, valve-sparing root surgery and selective TAVI for AR.

Key facts

Aortic valve regurgitation at a glance.

The essentials, in plain English - what it is, what causes it and how the UK grades and treats it in 2026.

  • What it is

    Backflow of blood through an incompetent aortic valve during diastole - a leaflet or aortic root problem, or both.

  • Leaflet causes

    Bicuspid aortic valve, rheumatic disease, infective endocarditis and degenerative calcification are the main leaflet-side drivers.

  • Root causes

    Aortic root dilation and aneurysm, Marfan syndrome, ankylosing spondylitis and aortic dissection stretch or split the leaflets apart.

  • Chronic vs acute

    Chronic AR is slow and often silent for years; acute AR from endocarditis, dissection or trauma is a cardiogenic-shock emergency.

  • How it is graded

    Transthoracic echo grades severity by regurgitant volume, vena contracta width and pressure half-time - cardiac MRI is used when echo is uncertain.

  • Foundation of care

    Timely valve surgery for severe symptomatic disease, LV dysfunction or root dilation - medical therapy buys time, it does not fix the leak.

Why this guide matters

The ventricle sets the clock, not the calendar.

Chronic AR is often silent for years. The three points below decide who is watched, who is operated and when.

  • Leaflet or root - or both

    Bicuspid valves, rheumatic disease and endocarditis damage leaflets; aneurysms, Marfan and ankylosing spondylitis dilate the root - both routes lead to AR.

  • Cardiac MRI has changed grading

    When echo is borderline, MRI-derived regurgitant fraction and LV volumes now settle severity and time the operation.

  • Modern surgery preserves valves

    Valve-sparing David and cusp repair keep the native valve when anatomy allows - Bentall and mechanical AVR remain the workhorses when it does not.

How the diagnosis is made

From a murmur to a surgical plan.

The steps a UK cardiologist will normally follow, in order - so you know what to expect at each visit.

  1. 01

    Assessing

    History and pulse examination

    Dyspnoea, orthopnoea and angina alongside a wide pulse pressure, a collapsing Corrigan pulse and an early diastolic murmur at the left sternal edge.

  2. 02

    Assessing

    ECG and chest X-ray

    Left ventricular hypertrophy on ECG and cardiomegaly with a dilated ascending aorta on chest film point the way to imaging.

  3. 03

    Assessing

    Transthoracic echocardiogram (TTE)

    The first-line test - grades severity by regurgitant volume, vena contracta width and pressure half-time and measures LV size and function.

  4. 04

    Confirming

    Transoesophageal echo (TOE)

    Used when TTE windows are poor, when endocarditis or leaflet prolapse is suspected, and to plan valve-sparing or repair surgery.

  5. 05

    Confirming

    Cardiac MRI

    Quantifies regurgitant fraction and LV volumes precisely when echo is uncertain - now the arbiter of severity in borderline cases.

  6. 06

    Confirming

    Coronary CT and angiography

    Coronary CT angiography or invasive coronary angiography maps the coronaries and the aorta before any planned valve or root surgery.

  7. 07

    Preparing

    Bloods and genetic testing

    BNP or NT-proBNP tracks haemodynamic strain; genetic testing for Marfan, Loeys-Dietz and other connective-tissue syndromes when the root is dilated in a younger patient.

Typical timeline: first murmur to a decision on surgery in a matter of weeks.

Symptoms

What aortic regurgitation feels like.

The classic mix of breathlessness, angina and peripheral pulse signs - and the acute picture that means you cannot wait.

  • Breathlessness on exertion

    The most common early symptom of chronic AR - a marker that the left ventricle is struggling to keep up with the volume overload.

  • Orthopnoea and PND

    Breathlessness lying flat and waking gasping at night suggest rising left-atrial pressure - a signal to escalate quickly.

  • Angina without coronary disease

    Diastolic runoff steals coronary perfusion pressure - severe AR can cause chest pain even with clean coronary arteries.

  • Wide pulse pressure

    A high systolic and low diastolic pressure - the fingerprint of severe chronic AR at the cuff.

  • Corrigan (water-hammer) pulse

    A briskly rising, rapidly collapsing pulse - one of the classic peripheral signs of severe aortic regurgitation.

  • Early diastolic murmur

    A soft, high-pitched murmur best heard at the left sternal edge with the patient leaning forward in held expiration.

  • Acute AR - flash pulmonary oedema

    Sudden severe leak from endocarditis, dissection or trauma - the ventricle has no time to adapt and the patient decompensates fast.

  • Red flag - shock or dissection pain

    Cardiogenic shock, tearing chest or back pain, or a new murmur with fever demand emergency admission - not a clinic appointment.

Treatment

How aortic regurgitation is treated in the UK.

Medical therapy buys time and controls symptoms. Surgery corrects the leak - and the choice of operation depends on age, valve anatomy and whether the aortic root is involved.

  • Watchful waiting with serial echo

    Asymptomatic mild-to-moderate AR with a normal LV is monitored by echo every 6 to 24 months - surgery is timed by the ventricle, not the calendar.

  • ACE inhibitor or ARB

    Afterload-reducing therapy for symptomatic patients unfit for surgery or those with coexisting hypertension - it eases the leak but does not cure it.

  • Losartan for Marfan syndrome

    An ARB used to slow aortic-root growth in Marfan and related connective-tissue syndromes, alongside beta-blockade in selected patients.

  • Mechanical aortic valve replacement

    A durable prosthesis for younger patients willing to take lifelong warfarin - decades of life expected from the valve.

  • Bioprosthetic aortic valve (AVR)

    A tissue valve avoiding lifelong anticoagulation - preferred in older patients and where pregnancy is planned.

  • Bentall composite root replacement

    Combined valve and ascending aorta replacement when the root is dilated beyond 55 mm (or lower in Marfan) - the workhorse for aneurysmal AR.

  • Valve-sparing David procedure

    The native aortic valve is preserved and re-implanted inside a Dacron graft - the choice for young patients with a good valve but a dilated root.

  • Aortic valve repair for prolapse

    Direct repair of a prolapsing cusp - technically demanding but avoids a prosthesis when leaflet anatomy is favourable.

  • TAVI for high-risk elderly AR

    Transcatheter aortic valve implantation is used off-label in selected high-risk elderly patients with pure AR when open surgery is prohibitive.

  • Ross procedure

    The patient’s own pulmonary valve is moved into the aortic position - a specialist option for selected younger patients in expert centres.

Guideline triggers for surgery (ESC/EACTS 2021, AHA/ACC 2020)

  • · Any symptomatic severe AR.
  • · LVEF at or below 50 percent in severe AR.
  • · LV end-systolic dimension > 50 mm (or > 25 mm/m²).
  • · Aortic root or ascending aorta > 55 mm (lower thresholds in Marfan and bicuspid disease).
  • · Acute severe AR from endocarditis, dissection or trauma - regardless of ventricular measurements.

What this guide is based on

The sources behind every claim on this page.

UK national guidance 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 cardiologist or cardiothoracic surgeon knows your echo and your aorta and can tell you which parts apply to you. If in doubt, get seen.

  • ESC/EACTS. 2021 Guidelines for the management of valvular heart disease.

  • AHA/ACC. 2020 Guideline for the management of patients with valvular heart disease.

  • NICE. Heart valve disease presenting in adults (NG208).

  • British Society of Echocardiography. Guideline for the assessment of aortic regurgitation.

Red flags

When aortic regurgitation needs urgent attention.

Chronic AR is a clinic problem. These are the situations that are not - and where hours matter more than days.

  • Acute severe AR from endocarditis

    A new early diastolic murmur with fever and vegetations on echo - a surgical emergency; delay increases mortality sharply.

  • Aortic dissection with AR

    Sudden tearing chest or interscapular pain with a new murmur - a type A dissection until proven otherwise; call the cardiothoracic on-call team.

  • Cardiogenic shock and pulmonary oedema

    Acute AR gives the ventricle no time to dilate - patients present in flash pulmonary oedema with hypotension and need urgent surgery.

  • LV dysfunction (LVEF ~50 percent or less)

    A hard trigger for aortic valve replacement in chronic severe AR under ESC/AHA 2021 - the LV rarely recovers if surgery is delayed further.

  • LV end-systolic dimension > 50 mm

    An index-adjusted LVESD above 50 mm (or 25 mm/m²) is another Class I trigger for surgery even without symptoms.

  • Aortic root or ascending aorta > 55 mm

    Progressive aneurysmal dilation - the threshold falls to 45 to 50 mm in Marfan and bicuspid valves with risk features.

  • New atrial fibrillation

    A late marker of atrial pressure loading - often the tipping point to move a borderline patient towards surgery.

  • Rapid symptom escalation

    Any acceleration of breathlessness, orthopnoea or angina in a patient with known AR needs prompt cardiology review - not the next routine slot.

  • Suspected connective-tissue syndrome

    A tall thin patient with a dilated root or a family history of aortic dissection - refer for genetics and specialist aorta clinic input.

Living with it

A treatable condition, with a clear ladder.

Four things that matter day to day - keep the surveillance echo diary, stay active within advice, protect against endocarditis, and act on the guideline triggers when they arrive.

A quiet reminder

The ventricle rarely gives you a warning.

This is why serial echo matters - a small drop in LVEF or a rise in LVESD is often the first sign that the clock has run out on watchful waiting.

  1. 01 Monitor

    Keep every echo appointment

    Serial echo is what keeps you safe - the ventricle changes silently long before symptoms arrive.

  2. 02 Move

    Stay active within advice

    Most patients with mild-to-moderate AR can exercise normally - severe AR needs a tailored plan and no heavy static loading.

  3. 03 Protect

    Dental and skin hygiene

    Endocarditis is a real risk with any structural valve disease - keep dental reviews current and take skin infections seriously.

  4. 04 Escalate

    Don’t wait past a trigger

    If symptoms appear, or LVEF, LVESD or root diameter cross a guideline threshold, surgery should follow - not be deferred.

Frequently asked

Everything we get asked about aortic regurgitation.

Quick answers on causes, grading, when surgery is needed and the options in modern UK cardiothoracic practice.

  • What is aortic valve regurgitation?

    It is a leak of the aortic valve so that blood flows back into the left ventricle during diastole. It is the same condition as aortic regurgitation and is caused either by a problem with the valve leaflets themselves (bicuspid valve, rheumatic disease, endocarditis, degenerative calcification) or by dilation of the aortic root, or both.

  • How is aortic valve regurgitation different from aortic regurgitation?

    It is the same condition. "Aortic regurgitation" is the shorter clinical term used in most UK textbooks and our primary guide lives at /conditions/aortic-regurgitation. This page covers exactly the same disease and links out to it for the shortest, most searched URL.

  • How is severity measured?

    A transthoracic echocardiogram is the first-line test. Severity is graded by the regurgitant volume, the width of the vena contracta and the pressure half-time on continuous-wave Doppler. Cardiac MRI is used when echo is inconclusive and gives the most precise regurgitant fraction and left ventricular volumes.

  • When does aortic valve regurgitation need surgery?

    ESC/EACTS 2021 and AHA/ACC 2020 guidelines recommend aortic valve replacement in severe AR when the patient is symptomatic, when LVEF falls to around 50 percent or less, when the LV end-systolic dimension exceeds 50 mm, or when the aortic root or ascending aorta reaches 55 mm (with lower thresholds in Marfan and bicuspid patients).

  • What surgical options exist?

    Mechanical or bioprosthetic aortic valve replacement, a Bentall composite root replacement for aneurysmal disease, a valve-sparing David procedure to preserve a good native valve inside a Dacron graft, direct aortic valve repair for isolated leaflet prolapse, transcatheter aortic valve implantation (TAVI) in selected high-risk elderly patients, and the Ross procedure in specialist centres.

  • What makes acute aortic regurgitation an emergency?

    Acute AR from endocarditis, aortic dissection or chest trauma leaves the left ventricle no time to dilate and adapt. Left atrial and pulmonary pressures rise sharply and patients present with flash pulmonary oedema, hypotension and cardiogenic shock. It is a surgical emergency, not a clinic problem.

Related content

Keep reading.