Aortic regurgitation (AR) is the diastolic retrograde flow of blood from the aorta into the left ventricle due to incompetent aortic valve closure. It may be acute (a surgical emergency) or chronic (often asymptomatic for years before decompensation). AR is classified as primary (intrinsic valve pathology) or secondary (aortic root/annular dilation). [1-2]
The following figure illustrates the hemodynamic progression from acute to chronic compensated and decompensated AR:
1. History
- Onset and tempo: Acute vs. chronic — acute AR (endocarditis, dissection, trauma) presents with sudden dyspnea and hemodynamic collapse; chronic AR has an insidious course [1][4]
- Exertional dyspnea: Most common symptom of chronic decompensated AR; ask about exercise tolerance and NYHA class [4]
- Orthopnea / PND: Suggests elevated LV filling pressures and decompensation
- Chest pain: May occur from reduced coronary perfusion (low diastolic BP) even without coronary disease
- Palpitations: Awareness of forceful heartbeat, especially when lying on the left side (from hyperdynamic circulation)
- Syncope / presyncope: Less common than in aortic stenosis but can occur
- Timing: Duration of known murmur, prior echocardiograms, rate of symptom progression
- Important negatives: Absence of fever/chills (argues against endocarditis), no tearing chest/back pain (argues against dissection)
2. Alarm Features
- Acute severe AR is a surgical emergency — suspect with sudden-onset pulmonary edema, hypotension, tachycardia, and a soft/short diastolic murmur (LV and aortic pressures equilibrate rapidly) [4]
- Aortic dissection: Tearing chest/back pain, asymmetric blood pressures, new AR murmur, malperfusion signs [5]
- Infective endocarditis: Fever, new murmur, embolic phenomena (Janeway lesions, Osler nodes, splinter hemorrhages)
- Cardiogenic shock: Hypotension, tachycardia, pulmonary edema, cool extremities
- Rapidly declining LVEF on serial imaging in chronic AR — indicates transition to irreversible myocardial damage [1]
- Annual mortality exceeds 20% when LVEF <30% [1]
3. Medications
Medical therapy for chronic AR
- ACE inhibitors / ARBs: First-line for hypertension (SBP >140 mmHg) in chronic AR; also recommended as GDMT in patients with reduced LVEF who are not surgical candidates [4][6]
- Dihydropyridine CCBs (e.g., nifedipine, amlodipine): Alternative vasodilators for blood pressure control [1][6]
- Sacubitril/valsartan: Recommended for patients with severe AR and reduced LVEF who have prohibitive surgical risk [4]
- Diuretics: For volume management in symptomatic HF
Acute AR stabilization
- Nitroprusside: First-line vasodilator for afterload reduction in acute decompensated AR [2][7]
- Inotropes (dobutamine, dopamine): To augment forward flow as a bridge to surgery [2]
Medications to avoid or use cautiously
- Beta-blockers: Block compensatory tachycardia in acute AR (except in aortic dissection where they reduce shear stress — use cautiously) [4][7]
- IABP: Absolutely contraindicated — augments diastolic pressure and worsens regurgitation [2][4]
- Phenylephrine / vasopressin: Pure vasoconstrictors increase afterload and worsen AR [7]
- Vasodilator therapy is not indicated in asymptomatic patients with mild-moderate AR and normal LV function [2]
4. Diet
- Sodium restriction: Standard HF dietary guidance (≤2 g/day) for patients with symptomatic AR and volume overload
- Fluid management: Avoid excessive fluid intake in decompensated states
- No specific dietary triggers unique to AR; general cardiovascular-healthy diet applies
- Endocarditis prophylaxis considerations: no specific dietary restrictions, but dental hygiene is important for prevention
5. Review of Systems
- Cardiovascular: Dyspnea on exertion, orthopnea, PND, chest pain, palpitations, syncope, lower extremity edema
- Respiratory: Cough (especially nocturnal), hemoptysis (if pulmonary edema)
- Infectious: Fever, chills, night sweats, weight loss (endocarditis screen)
- Neurologic: Focal deficits, visual changes (embolic events from endocarditis or dissection)
- Musculoskeletal: Joint hypermobility, tall stature (connective tissue disorders — Marfan, Ehlers-Danlos)
- GI: Abdominal pain (mesenteric malperfusion in dissection)
- Rheumatologic: Joint pain, back stiffness (ankylosing spondylitis)
6. Collateral History and Family History
- Family history: Bicuspid aortic valve (heritable), Marfan syndrome (FBN1), Ehlers-Danlos syndrome, familial thoracic aortic aneurysm/dissection, Loeys-Dietz syndrome [2]
- Prior rheumatic fever: Especially in patients from low- to middle-income countries [4]
- IV drug use: Risk factor for infective endocarditis
- Recent dental or invasive procedures: Endocarditis risk
- Known aortic root dilation or bicuspid valve in family members
7. Risk Factors
- Bicuspid aortic valve (most common congenital cause in high-income countries) [2][4]
- Chronic hypertension (leading cause of secondary/functional AR) [1]
- Rheumatic heart disease (leading cause in low- to middle-income countries) [4]
- Connective tissue disorders: Marfan syndrome, Ehlers-Danlos, osteogenesis imperfecta [2]
- Infective endocarditis (both acute and chronic AR) [2]
- Aortic root dilation / ascending aortic aneurysm [1]
- Age-related calcific degeneration
- Prior aortic valve surgery or transcatheter procedures (iatrogenic) [4]
- Inflammatory conditions: Ankylosing spondylitis, reactive arthritis, giant cell arteritis, syphilitic aortitis [2]
- Blunt chest trauma [4]
8. Differential Diagnosis
- Aortic stenosis with mixed valve disease: ~20% of severe AR patients have concomitant AS [8]
- Mitral regurgitation: Can coexist; differentiate by murmur timing and location
- Pulmonary regurgitation: Graham Steell murmur in pulmonary hypertension — diastolic murmur at left sternal border
- Patent ductus arteriosus: Continuous "machinery" murmur
- Ruptured sinus of Valsalva aneurysm: Acute continuous murmur with hemodynamic compromise
- Aortic dissection (as cause of acute AR) [5]
- High-output states (thyrotoxicosis, anemia, AV fistula): Wide pulse pressure mimics but no diastolic murmur
9. Past Medical History
- Prior echocardiograms documenting valve morphology and LV dimensions (critical for serial comparison)
- Known bicuspid aortic valve or other congenital heart disease
- History of rheumatic fever or endocarditis
- Prior cardiac surgery (valve repair/replacement, CABG)
- Known aortic root dilation or aneurysm
- Connective tissue disorder diagnosis
- Hypertension, diabetes, coronary artery disease (affect surgical risk)
10. Physical Exam
Vital signs
- Wide pulse pressure (hallmark) — elevated systolic, low diastolic BP [9-10]
- Decreasing diastolic BP is an independent mortality risk factor [9]
- Hill's sign: Leg SBP ≥30 mmHg higher than arm SBP (suggests severe AR) [10]
Cardiac auscultation
- High-pitched, blowing, early diastolic decrescendo murmur best heard at the left sternal border with the patient sitting up and leaning forward in end-expiration [2][10]
- Murmur louder at right sternal border → suggests aortic root dilation as etiology [2]
- Austin Flint murmur: Low-pitched diastolic rumble at the apex — specific for severe AR [2][10]
- S3: Common in severe AR from volume overload (not necessarily indicating HF) [2]
- Systolic flow murmur from increased stroke volume may be louder than the diastolic murmur [9]
Peripheral signs of severe AR (hyperdynamic circulation)
- Corrigan's pulse (water-hammer pulse): Bounding carotid pulse with rapid upstroke and collapse [10]
- Quincke's pulse: Nail bed capillary pulsation [10]
- de Musset's sign: Head bobbing with each heartbeat [10]
- Displaced and hyperdynamic PMI (laterally and inferiorly) [2]
In acute AR
- Physical findings may be subtle — pulse pressure may not be wide because the LV has not dilated; diastolic murmur may be soft and short [1]
- Tachycardia, pulmonary edema, and signs of low cardiac output predominate
11. Lab Studies
- BNP / NT-proBNP: Elevated in decompensated AR with HF; useful for monitoring
- CBC: Anemia worsens AR hemodynamics; leukocytosis if endocarditis suspected
- Blood cultures (×2 sets from separate sites): If endocarditis suspected
- ESR / CRP: Elevated in endocarditis or inflammatory aortitis
- Basic metabolic panel: Renal function (pre-surgical assessment, diuretic monitoring)
- Troponin: If acute coronary syndrome is in the differential or in acute AR with hemodynamic compromise
- Syphilis serology (RPR/VDRL): If syphilitic aortitis suspected
- Coagulation studies: Pre-surgical baseline
12. Imaging
First-line
- Transthoracic echocardiography (TTE)[4][9]
Severity criteria for severe AR on TTE: [1][4]
Second-line / advanced
- Cardiac MRI (CMR): Gold standard for AR quantification when echo is discordant or suboptimal; also assesses myocardial fibrosis (late gadolinium enhancement, T1 mapping) which predicts adverse outcomes [1][9]
- TEE: For detailed leaflet morphology, surgical planning, or when TTE is inadequate; sensitivity 98–100% for Type A dissection [4]
- CT angiography: Primary modality for acute aortic dissection diagnosis [4]
- Chest X-ray: Cardiomegaly, aortic root dilation, pulmonary congestion
When imaging is unnecessary
13. Special Tests
- Exercise stress testing: Reasonable in "asymptomatic" patients with severe AR to unmask symptoms or abnormal hemodynamics [1]
- Global longitudinal strain (GLS): GLS worse than −18% to −19% may detect subclinical LV dysfunction and predict adverse outcomes even with preserved LVEF [1]
- Cardiac catheterization / aortography: When noninvasive imaging is inconclusive or pre-operative coronary assessment is needed [2]
14. ECG
- LV hypertrophy (LVH) voltage criteria: Present in ~73% of severe AR by Sokolow-Lyon criteria [11]
- Left axis deviation
- ST-T wave "strain" pattern: ST depression and T-wave inversion in lateral leads — associated with increased LV mass, elevated wall stress, and depressed EF [12-13]
- Prolonged PR interval: Present in ~28% of severe AR patients [11]
- QRS prolongation (≥120 ms): In ~20% of severe AR, suggesting conduction disease [11]
- Left atrial enlargement: In advanced disease with elevated filling pressures
- In acute AR: Sinus tachycardia; may have nonspecific ST-T changes; LVH criteria typically absent (no time for hypertrophy)
15. Assessment
AR is staged A through D per the 2020 ACC/AHA guidelines: [4]
- Stage A: At risk (e.g., BAV, aortic root disease) — no regurgitation
- Stage B: Progressive mild-moderate AR — normal LV function
- Stage C1: Asymptomatic severe AR with normal LVEF (>55%) and mild-moderate LV dilation (LVESD <50 mm)
- Stage C2: Asymptomatic severe AR with depressed LVEF (≤55%) or severe LV dilation (LVESD >50 mm)
- Stage D: Symptomatic severe AR — exertional dyspnea, angina, or HF symptoms
The chronic compensated phase may last years, but once maladaptive remodeling and myocardial fibrosis develop, changes are often irreversible. [1] Acute AR is a distinct entity with rapid hemodynamic deterioration requiring emergent intervention. [4]
The following figure summarizes the management algorithm for chronic AR:
16. Treatment Plan
Acute severe AR
- Emergent surgical aortic valve replacement — do not delay [4]
- Bridge to surgery: IV nitroprusside for afterload reduction; inotropes (dobutamine/dopamine) if hypotensive [2][7]
- Contraindicated: IABP, peripheral VA-ECMO, Impella (all worsen AR hemodynamics) [4][7]
- Beta-blockers: Use cautiously — block compensatory tachycardia (exception: aortic dissection) [4]
Chronic AR — medical therapy
- Hypertension (SBP >140): Treat with ACE inhibitors, ARBs, or dihydropyridine CCBs [4][6]
- Prohibitive surgical risk with reduced LVEF: GDMT including ACE inhibitors/ARBs, sacubitril/valsartan, diuretics [4]
- No evidence that vasodilators alter disease course or delay surgery in normotensive patients with normal LV function [2][4]
Chronic AR — surgical intervention (Class I indications per ACC/AHA 2020): [4][14]
- Symptomatic severe AR (Stage D) — regardless of LVEF
- Asymptomatic severe AR with LVEF ≤55% (Stage C2)
- Severe AR undergoing other cardiac surgery
Class IIa
- Asymptomatic severe AR with LVESD >50 mm or LVESDi >25 mm/m² [4]
- Moderate AR undergoing other cardiac surgery [4]
Class IIb
Emerging thresholds (ESC 2025): [1]
Surgical options
- SAVR (mechanical or bioprosthetic): Standard of care [1]
- Valve-sparing root replacement (David procedure): For secondary AR with normal cusps, especially in patients <65 years [8]
- Aortic valve repair: Increasingly used for cusp prolapse at experienced centers; freedom from reoperation ~88% at 5 years, ~73% at 10 years [8]
- TAVI: Not recommended for isolated severe AR with surgical indications (Class III: Harm); off-label use in high-risk patients shows ~10% need for second valve [4][8]
17. Disposition
Admit / ICU
- Acute severe AR — surgical emergency [4]
- Decompensated chronic AR with pulmonary edema, hypotension, or cardiogenic shock [7]
- New-onset AR with suspected endocarditis or aortic dissection [5]
Observation
Discharge criteria
- Stable chronic AR (Stages A–C1) with established follow-up plan
- Hemodynamically stable, no acute etiology identified
Specialist consultation triggers
- Cardiology: All new diagnoses of moderate or greater AR for echocardiographic surveillance planning
- Cardiothoracic surgery: When surgical thresholds are met or approaching (LVEF ≤55%, LVESD >50 mm, symptomatic severe AR) [4]
- Infectious disease: If endocarditis suspected
- Genetics: If connective tissue disorder suspected (Marfan, Ehlers-Danlos)
18. Follow Up / Return Precautions
Surveillance echocardiography intervals (ACC/AHA 2020): [4]
- Mild AR (Stage B): Every 3–5 years
- Moderate AR (Stage B): Every 1–2 years
- Severe AR, asymptomatic, normal LVEF (Stage C1): Every 6–12 months
- Severe AR with LV dilation approaching thresholds: Every 3–6 months
Return precautions — instruct patients to seek immediate care for:
- New or worsening shortness of breath, especially at rest or lying flat
- Chest pain or syncope
- Sudden onset of severe dyspnea (may indicate acute decompensation or superimposed acute AR)
- Fever with new or changing murmur (endocarditis)
- Sudden tearing chest/back pain (dissection)
Patient counseling
- Chronic AR may remain asymptomatic for years, but regular follow-up is essential to detect LV changes before irreversible damage occurs [1]
- Exercise: Mild-moderate AR — no restrictions; severe AR — avoid heavy isometric exercise and competitive sports
- Endocarditis prophylaxis: Per current guidelines (only for prosthetic valves, prior endocarditis, certain congenital conditions)
- Expected recovery after AVR: Most patients experience significant symptom improvement; long-term outcomes are best when surgery is performed before LVEF declines below 50% [1][4]
References
1. Contemporary Diagnosis and Treatment of Aortic Regurgitation: A State-of-the-Art Review. — Pawar S, Allen C, Mori M, et al. Journal of the American College of Cardiology. 2026.
2. 2008 Focused Update Incorporated Into the ACC/AHA 2006 Guidelines for the Management of Patients With Valvular Heart Disease: A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Revise the 1998 Guidelines for the Management of Patients With Valvular Heart Disease). Endorsed by the Society of Cardiovascular Anesthesiologists, Society for Cardiovascular Angiography and Interventions, and Society of Thoracic Surgeons. — Bonow RO, Carabello BA, Chatterjee K, et al. Journal of the American College of Cardiology. 2008.
3. Valvular Disorders. — Elias Hanna Practical Cardiovascular Medicine 2e. 2022.
4. 2020 ACC/AHA Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of Cardiology/American Heart Association Joint Committee on Clinical Practice Guidelines. — Otto CM, Nishimura RA, Bonow RO, et al. Journal of the American College of Cardiology. 2021.
5. 2022 ACC/AHA Guideline for the Diagnosis and Management of Aortic Disease: A Report of the American Heart Association/American College of Cardiology Joint Committee on Clinical Practice Guidelines. — Isselbacher EM, Preventza O, Hamilton Black Iii J, et al. Journal of the American College of Cardiology. 2022.
6. 2014 AHA/ACC Guideline for the Management of Patients With Valvular Heart Disease: Executive Summary: A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. — Nishimura RA, Otto CM, Bonow RO, et al. Journal of the American College of Cardiology. 2014.
7. Acute Decompensated Valvular Disease in the Intensive Care Unit. — Miller PE, Senman BC, Gage A, et al. JACC. Advances. 2024.
8. Valvular Heart Disease: From Mechanisms to Management. — Praz F, Beyersdorf F, Haugaa K, Prendergast B. Lancet. 2024.
9. Imaging Methods for Evaluation of Chronic Aortic Regurgitation in Adults: JACC State-of-the-Art Review. — Ranard LS, Bonow RO, Nishimura R, et al. Journal of the American College of Cardiology. 2023.
10. Valvular Heart Disease. — Carabello BA, Crawford FA. The New England Journal of Medicine. 1997.
11. Electrocardiographic Observations in Clinically Isolated, Pure, Chronic, Severe Aortic Regurgitation: Analysis of 30 Necropsy Patients Aged 19 to 65 Years. — Roberts WC, Day PJ. The American Journal of Cardiology. 1985.
12. Observations on the Capability of the Electrocardiogram to Detect Left Ventricular Function in Chronic Severe Aortic Regurgitation. — Scognamiglio R, Fasoli G, Bruni A, Dalla-Volta S. European Heart Journal. 1988.
13. Geometric and Functional Correlates of Electrocardiographic Repolarization and Voltage Abnormalities in Aortic Regurgitation. — Roman MJ, Kligfield P, Devereux RB, et al. Journal of the American College of Cardiology. 1987.
14. ACC/AHA and ESC/EACTS Guidelines For the Management of Valvular Heart Diseases: JACC Guideline Comparison. — Coisne A, Lancellotti P, Habib G, et al. Journal of the American College of Cardiology. 2023.