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Clinical Subject Page

Aortic Regurgitation

Also called

leaky aortic valve

ICD-10

I35.1

Specialty

Cardiology

Onset

Acute & Chronic

Reviewed

June 2026
On This Page

Overview

Aortic regurgitation (AR), commonly known as a leaky aortic valve, is a condition in which the aortic valve does not close completely, allowing blood to flow backward from the aorta into the left ventricle during diastole

Etiology & Risk Factors

-Acute Aortic Regurgitation

  • Infective endocarditis (most common valvular cause)
  • Ascending aortic dissection (most common aortic cause)
  • Chest trauma
  • Iatrogenic complications (e.g., after TAVR or balloon valvuloplasty)

Chronic Aortic Regurgitation

  • Congenital bicuspid aortic valve (most common cause in young adults in high-income countries)
  • Calcific aortic valve disease (most common cause in older adults in high-income countries)
  • Rheumatic heart disease (most common cause in lower-income countries)
  • Aortic root dilation due to:
    • Connective tissue disorders (e.g., Marfan syndrome, Ehlers-Danlos syndrome)
    • Chronic hypertension
    • Aortitis (e.g., tertiary syphilis)
    • Thoracic aortic aneurysm

 

-Risk Factors

  • Congenital bicuspid aortic valve
  • Calcific aortic valve disease
  • Rheumatic heart disease
  • Chronic hypertension
  • Connective tissue disorders (e.g., Marfan syndrome, Ehlers-Danlos syndrome)
  • Thoracic aortic aneurysm
  • Infective endocarditis
  • Aortic dissection

Pathophysiology

    • Aortic valve fails to close completely → blood flows backward from the aorta into the left ventricle (LV) during diastole.
    • This causes volume overload of the LV, leading to:
      • Increased systolic blood pressure
      • Decreased diastolic blood pressure
      • Widened pulse pressure (water hammer pulse)

    Acute Aortic regurgitation

    • The LV cannot dilate quickly enough to accommodate the regurgitant blood.
    • LV end-diastolic pressure rises rapidly → blood backs up into the lungs → pulmonary edema and dyspnea.
    • Severe cases can cause decreased cardiac output, cardiogenic shock, and myocardial ischemia.

    Chronic Aortic regurgitation

    • Initially, the LV compensates by increasing stroke volume to maintain cardiac output.
    • Over time, persistent volume overload causes LV enlargement (dilation) and eccentric hypertrophy.
    • Eventually, LV systolic dysfunction develops, leading to left-sided heart failure.

    Flow summary:
    Incomplete aortic valve closure → Backflow into LV during diastole → LV volume overload → LV dilation & eccentric hypertrophy → LV dysfunction → Left heart failure (chronic)

Clinical Presentation

-Acute Aortic Regurgitation

Symptoms

  • Sudden severe dyspnea
  • Pulmonary edema
  • Rapid heart failure/cardiac decompensation
  • Symptoms of the underlying cause:
    • Fever (infective endocarditis)
    • Chest pain (aortic dissection)

Auscultation

  • Soft S1
  • Soft, short early diastolic murmur

 

-Chronic Aortic Regurgitation

Symptoms

  • May be asymptomatic for years
  • Palpitations
  • Exertional dyspnea
  • Angina
  • Orthopnea
  • Easy fatigability
  • Syncope

Signs

  • Widened pulse pressure
  • Water hammer pulse (bounding pulse)

Auscultation

  • High-pitched, blowing, decrescendo early diastolic murmur (best heard along the left sternal border/Erb point in valvular AR)
  • S3 heart sound
  • Austin Flint murmur (in severe AR)

Key features to remember

    • Wide pulse pressure + Water hammer pulse
    • High-pitched early diastolic murmur
    • Chronic AR can remain asymptomatic for many years before symptoms of left-sided heart failure develop.
Aortic Regurgitation Case Oveview
Aortic Regurgitation Overview

History Taking

  • “Do you get short of breath, especially when walking or exercising?”
  • “Do you have chest pain or discomfort?”
  • “Do you notice your heart racing or pounding (palpitations)?”
  • “Do you feel unusually tired or fatigued?”
  • “Do you feel short of breath when lying flat or wake up at night short of breath?”
  • “Have you ever fainted or felt dizzy?”
  • “When did your symptoms start? Were they sudden or gradual?”
  • “Have you had a recent fever or heart infection?” (suggestive of infective endocarditis)
  • “Have you had sudden severe chest pain?” (suggestive of aortic dissection)
  • “Have you ever been told you have a heart murmur or valve disease?”
  • “Do you have a history of rheumatic fever, high blood pressure, or a connective tissue disorder (e.g., Marfan syndrome)?”
  •  

Aortic Stenosis Vs Aortic Regurgitation

Valvular Heart Disease · Aortic Stenosis vs Aortic Regurgitation

Aortic Stenosis (AS)
Obstruction to LV outflow → pressure overload → concentric LVH. Most common cause: calcific degeneration in elderly (>65 yrs) or bicuspid aortic valve in younger patients.
Aortic Regurgitation (AR)
Backflow from aorta into LV → volume overload → eccentric LVH + LV dilatation. Causes: aortic root dilatation, bicuspid valve, rheumatic fever, endocarditis, Marfan syndrome.
Parameter Aortic Stenosis Aortic Regurgitation
Pathology Narrowed aortic valve orifice → LV must generate high pressure to eject blood (pressure overload) Incompetent aortic valve → blood regurgitates back into LV during diastole (volume overload)
LV Response Concentric hypertrophy — wall thickens, cavity size normal or reduced Eccentric hypertrophy — wall thickens AND cavity dilates (Laplace law)
Onset Usually chronic & insidious (years of compensated disease before symptoms) Can be chronic (insidious) or acute (endocarditis, aortic dissection — surgical emergency)
Classic Triad / Symptoms
Syncope Angina Dyspnea
SAD triad — appear in this order as severity progresses. Syncope on exertion is a red flag.
Exertional dyspnea Palpitations Angina
Long asymptomatic phase. Symptoms indicate LV decompensation. Acute AR: flash pulmonary edema.
Pulse Pulsus parvus et tardus — small volume, slow-rising, delayed peak Corrigan's (water-hammer) pulse — large volume, bounding, rapid rise and collapse
Blood Pressure Narrow pulse pressure (<40 mmHg); systolic BP may be low in severe AS Wide pulse pressure (>60–80 mmHg); high systolic, low diastolic
Apex Beat Sustained (heaving), non-displaced — pressure-loaded LV Displaced laterally & downward, hyperdynamic — volume-loaded dilated LV
Murmur Type Ejection systolic (crescendo-decrescendo) — heard best at aortic area; radiates to carotids Early diastolic decrescendo — heard best at left sternal border, leaning forward in expiration
Additional Murmurs S4 (stiff LV); paradoxically split S2 (severe); ejection click (bicuspid valve) Austin Flint murmur (low-pitched mid-diastolic rumble at apex); S3 (dilated LV)
ECG Findings LVH with strain pattern (ST depression & T-wave inversion in V5–V6, I, aVL); LV strain LVH (voltage criteria); broad notched P (if LA enlarges); LV volume overload pattern
CXR Findings Normal heart size (concentric LVH); calcified aortic valve; post-stenotic aortic dilatation Cardiomegaly (LV enlargement); prominent aorta; pulmonary edema if decompensated
Echo / Severity Valve area: mild >1.5 cm², moderate 1.0–1.5 cm², severe <1.0 cm²; mean gradient severe >40 mmHg Regurgitant fraction: mild <30%, moderate 30–49%, severe ≥50%; LV end-systolic diameter
Medical Management No effective medical therapy to slow progression. Manage comorbidities (HTN, AF). Avoid vasodilators in severe AS. Vasodilators (nifedipine, ACEi/ARB) to reduce afterload & preload in chronic AR. Bridge to surgery.
Surgical Indications Severe AS + symptoms; severe AS + EF <50%; severe AS undergoing other cardiac surgery Severe AR + symptoms; severe AR + EF <50%; severe AR + LV ESD >50 mm
Intervention Options SAVR TAVR Balloon valvuloplasty (palliation only) SAVR Valve repair (if feasible) — TAVR emerging but less established
Prognosis Untreated symptomatic severe AS: 50% mortality at 2–3 yrs. Rapid decline after symptom onset. Chronic: long compensated phase. Once symptomatic: 10–20% annual mortality without surgery.
Pathophysiology cascade
Aortic Stenosis
1Valve orifice narrows → increased resistance to LV outflow
2LV generates higher systolic pressure → pressure overload
3Concentric LVH (parallel sarcomere addition) — wall:cavity ratio increases
4Diastolic dysfunction → reduced coronary reserve → subendocardial ischaemia
5Decompensation: systolic dysfunction, reduced CO, symptoms (SAD triad)
Aortic Regurgitation
1Valve incompetent → blood regurgitates from aorta into LV during diastole
2LV must handle both forward stroke volume + regurgitant volume → volume overload
3Eccentric LVH (series sarcomere addition) — cavity dilates, wall thickens proportionally
4High diastolic aortic pressure maintained → wide pulse pressure; low LVEDP early
5LV decompensation: EF falls, LVEDP rises, pulmonary hypertension, heart failure
Auscultation findings
Aortic Stenosis
Harsh ejection systolic murmur (crescendo-decrescendo)
Best heard: Right 2nd intercostal space (aortic area)
Radiation: Both carotids — key distinguishing feature
Character: Harsh, rasping; peaks in mid-systole; later peak = more severe
Maneuvers: Louder on squatting (increased preload); softer on standing/Valsalva
S2: Soft or absent A2; paradoxical splitting in severe AS
Extras: Ejection click (bicuspid valve); S4 (non-compliant LV)
Aortic Regurgitation
High-pitched early diastolic decrescendo murmur
Best heard: Left sternal border, 3rd–4th ICS (Erb's point)
Position: Patient leaning forward, end-expiration — brings aorta closer to chest wall
Character: Blowing, high-pitched; begins immediately after S2
Maneuvers: Louder on squatting & handgrip (increased afterload)
Austin Flint murmur: Low-pitched mid-diastolic rumble at apex — regurgitant jet impinges on anterior mitral leaflet
Extras: S3 (dilated LV); wide pulse pressure
Peripheral signs of aortic regurgitation (absent in AS)
Named signs
Corrigan's pulseBounding carotid pulsation — rapid rise & collapse
de Musset's signHead nodding with each heartbeat
Quincke's signVisible nail bed capillary pulsations
Duroziez's signSystolic & diastolic femoral bruits on compression
Traube's sign'Pistol shot' sound over femoral artery
Müller's signVisible uvular pulsation
Key signs in Aortic Stenosis
Pulsus parvus et tardusSlow-rising, small-amplitude carotid pulse — most specific sign of severe AS
Sustained apex beatHeaving, non-displaced — reflects concentric LVH
Systolic thrillPalpable over aortic area in severe AS
Narrow pulse pressureReduced stroke volume → low systolic, near-normal diastolic BP
Absent / soft A2Calcified immobile valve fails to produce closing sound

Investigations

  • Transthoracic echocardiography (TTE) – Gold standard for diagnosing Aortic regurgitation, identifying the cause, assessing severity, and evaluating left ventricular function.
  • Transesophageal echocardiography (TEE) – Used if TTE is inconclusive, for preoperative planning, or if aortic dissection or infective endocarditis is suspected.
  • ECG – May show left ventricular hypertrophy (LVH) in chronic Aortic regurgitation ; also helps assess for arrhythmias or ischemia.
  • Chest X-ray – May show left ventricular enlargement, pulmonary edema (acute AR), or a prominent aortic root.
  • Laboratory tests
    • Blood cultures if infective endocarditis is suspected.
    • BNP/NT-proBNP may help assess disease severity.
  • CT angiography (CTA) chest – Preferred if aortic dissection is suspected in acute AR.
  • Cardiac MRI – Used when echocardiography is inadequate or findings are inconclusive.
  • Cardiac catheterization/coronary angiography – Used in selected patients when noninvasive tests are inconclusive or before surgery.

Diagnosis

Aortic Regurgitation · Diagnosis & Severity

Diagnosis — Exam Focus
Clinical clues
• Early diastolic decrescendo murmur along the left sternal border
• Wide pulse pressure + bounding pulses in chronic severe AR
• Chronic severe AR → LV dilatation
Imaging
• TTE = initial test for mechanism, severity and LV response
• Use an integrative Doppler approach
• TEE if anatomy/severity remains unclear
• CMR when echo is inconclusive or quantification is needed
Severity Classification — Echocardiography
ParameterMildModerateSevere
Vena contracta< 0.3 cm0.3–0.6 cm> 0.6 cm
Jet width / LVOT width< 25%25–64%≥ 65%
Pressure half-time> 500 ms200–500 ms< 200 ms
Regurgitant volume< 30 mL/beat30–59 mL/beat≥ 60 mL/beat
Regurgitant fraction< 30%30–49%≥ 50%
EROA< 0.10 cm²0.10–0.29 cm²≥ 0.30 cm²
Descending aortic flowNo / brief reversalIntermediateHolodiastolic reversal
Important: Grade AR using multiple concordant parameters, not one measurement alone. LV dilatation is a supportive finding in chronic significant AR.
High-Yield Exam Associations
Severe AR
• VC > 0.6 cm
• RVol ≥ 60 mL/beat
• RF ≥ 50%
• EROA ≥ 0.30 cm²
• PHT < 200 ms
Most tested
• Early diastolic decrescendo murmur → AR
• Wide pulse pressure → chronic significant AR
• Holodiastolic descending-aortic flow reversal → severe AR
• TTE first; CMR if echo is inconclusive
Exam hook: AR = diastolic murmur + wide pulse pressure. Severe = VC >6 mm, RVol ≥60, RF ≥50%, EROA ≥0.30, PHT <200 ms.
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Management

1. Acute Aortic Regurgitation (Emergency)

  • Urgent cardiology and cardiothoracic surgery consultation
  • Urgent surgical aortic valve replacement (AVR) is the definitive treatment.
  • Stabilize the patient before surgery:
    • Treat cardiogenic shock (e.g., with dobutamine or dopamine)
    • Reduce afterload for acute heart failure (e.g., nitroprusside)
  • Treat the underlying cause (e.g., infective endocarditis or aortic dissection).
  • Avoid delaying surgery for medical treatment alone.
  • Avoid beta blockers unless the AR is caused by aortic dissection.
  • Intra-aortic balloon pump (IABP) is contraindicated because it increases the amount of regurgitation.

 

2. Chronic Aortic Regurgitation

Asymptomatic patients

  • Regular follow-up with serial echocardiography.
  • Screen for and treat cardiovascular risk factors.
  • Treat hypertension (vasodilators such as ACE inhibitors or ARBs may be preferred).
  • Treat heart failure if present.

Symptomatic or severe Aortic regurgitation

  • Surgical aortic valve replacement (AVR) is the standard treatment.

 

3. Indications for Surgery

  • Acute severe Aortic regurgitation
  • Symptomatic chronic severe Aortic regurgitation
  • Asymptomatic severe Aortic regurgitation with:
    • LVEF ≤ 55%
    • Consider if LV end-systolic diameter (LVESD) > 50 mm
    • Patient already undergoing cardiac surgery for another reason

 

4. Follow-up

  • Regular echocardiography to monitor progression:
    • Mild AR: every 3–5 years
    • Moderate AR: every 1–2 years
    • Severe asymptomatic AR: every 6–12 months

Complications

    • Left ventricular dilation
    • Left ventricular systolic dysfunction
    • Left-sided heart failure
    • Pulmonary edema (especially in acute Aortic regurgitation)
    • Cardiogenic shock (severe acute Aortic regurgitation)

Prognosis

  • Asymptomatic patients with normal LV function: Progression to symptoms or LV dysfunction is < 6% per year.
  • Asymptomatic patients with reduced ejection fraction: Progression to symptoms is > 25% per year.
  • Symptomatic patients: Mortality is > 10% per year and may reach 25% per year if left untreated

Key Points / Clinical Pearls

  • Aortic Regurgitation= leaky aortic valve → blood flows back into the LV during diastole.
  • Can be acute or chronic.
  • Classic murmur: High-pitched, blowing early diastolic decrescendo murmur.
  • Classic sign: Wide pulse pressure with a water hammer pulse.
  • Gold standard diagnosis: Transthoracic echocardiography (TTE).
  • Definitive treatment of Aortic regurgitation : Aortic valve replacement.
  • Acute severe Aortic regurgitation is a medical emergency requiring urgent surgery.