Cardiovascular · Topic 30 of 48

Aortic Regurgitation

Cardiovascular · valvular heart disease

Aortic Regurgitation

Chronic AR dilates the ventricle quietly for years; acute AR floods a normal-sized ventricle and causes shock — a surgical emergency, and never a balloon pump.

Key numbers

Operate on symptoms or LVEF ≤ 55%LVEF ≤ 55%

Echo markers of severe ARRF ≥ 50%

01 · DoAcute AR needs emergency surgery

Acute severe AR requires prompt aortic valve replacement or repair; medical afterload reduction only buys time, and surgery should not be delayed, especially with hypotension, pulmonary edema or low flow.

02 · AvoidIntra-aortic balloon pump is contraindicated

Never place an intra-aortic balloon pump in significant AR: diastolic balloon inflation drives more blood back across the valve and worsens regurgitation.

03 · Defined byOperate on symptoms or LVEF ≤ 55%

Chronic severe AR needs valve surgery once symptoms appear, LVEF falls to ≤ 55%, or the LV end-systolic dimension exceeds 50 mm (25 mm/m²) — before irreversible LV dysfunction.

What it is

Core idea

Chronic AR: years silent, then heart failureIn chronic AR the LV dilates and hypertrophies gradually, keeping pressures and output normal for years; exertional dyspnea, orthopnea and PND appear late and correlate poorly with LV function.

Causes & risk factors

Why it happens

Chronic causes: degenerative root, bicuspid, rheumaticChronic AR in adults comes from degeneration of the valve or aortic root (often with a bicuspid valve), endocarditis, myxomatous disease (Marfan), rheumatic fever, and rarely aortitis or ankylosing spondylitis.

Presentation

What you'll see

Blowing early diastolic decrescendo murmur must knowChronic AR murmur: a blowing, high-pitched early diastolic decrescendo murmur at the left sternal border, heard best with the patient sitting forward at end-expiration; it gets louder with squatting or handgrip.

Chronic AR: wide pulse pressureAs chronic AR progresses, systolic pressure rises and diastolic pressure falls, giving a wide pulse pressure with a bounding water-hammer (collapsing) pulse and a displaced, enlarged apical impulse.

Austin Flint murmur mimics mitral stenosisSevere AR can produce an apical mid-to-late diastolic rumble (Austin Flint murmur) from the regurgitant jet striking the mitral leaflet, mimicking mitral stenosis.

Diagnosis & monitoring

Work-up

Echo markers of severe AREcho signs of severe chronic AR: jet width ≥ 65% of the outflow tract, vena contracta > 6 mm, regurgitant volume ≥ 60 mL/beat, regurgitant fraction ≥ 50%, or holodiastolic abdominal aortic flow reversal.

Do right now

In this order

First moves

Emergency echo, and image the aorta

→

Bridge with nitroprusside, add dobutamine if needed

→

Acute AR needs emergency surgery

Why each step

Emergency echo, and image the aortaEchocardiography confirms and grades AR and can show vegetations or dissection-related effusion; TEE or gated CT/MRI defines the aortic root and ascending aorta when dissection or dilation is suspected.

Bridge with nitroprusside, add dobutamine if neededWhile surgery is arranged in acute AR, reduce afterload with IV nitroprusside and add dobutamine if output stays low, keeping the heart rate up; this only temporizes and must not delay surgery.

Acute AR needs emergency surgeryAcute severe AR requires prompt aortic valve replacement or repair; medical afterload reduction only buys time, and surgery should not be delayed, especially with hypotension, pulmonary edema or low flow.

Red flags & don'ts

Avoid harm

Avoid bradycardia and beta-blockers avoidSlower heart rates lengthen diastole and increase the regurgitant volume, so avoid bradycardia and use beta-blockers with caution in AR.

Acute or chronic aortic regurgitation?

Commonly confused

Usual cause	Endocarditis or ascending aortic dissection
Left ventricle	Normal size — pressure spikes
Presentation	Pulmonary edema, hypotension, shock
Pulse pressure and murmur	Low BP; murmur soft or absent
Treatment	Emergency valve surgery

More detail

Reference

Show 8 reference facts

Ascending aortic surgery may be needed before the valve: diameter > 55 mm, or 50–55 mm with a bicuspid valve plus risk factors, or > 50 mm in Marfan syndrome.

TAVR is difficult in pure AR because the annulus is dilated and leaflets lack calcium, risking valve migration and paravalvular leak; surgical replacement or repair is standard.

ARBs may slow aortic root dilation but do not change AR severity; patients who meet surgical criteria but cannot have surgery get standard heart failure therapy.

Classic peripheral signs of chronic AR: Corrigan (visible carotid pulsation), de Musset (head bobbing), Quincke (nail-bed pulsation), Traube (pistol-shot femoral sounds), Duroziez (femoral bruit) and Hill (popliteal SBP ≥ 60 mmHg above brachial).

Coronary angiography is done before AR surgery even without angina, because about 20% of patients with severe AR have significant coronary disease.

Severe AR not yet meeting surgical criteria needs examination and echo every 6–12 months.

In acute AR the first heart sound is often absent because aortic and LV diastolic pressures equalize, and an S3 is common.

Screen first-degree relatives of a patient with a bicuspid aortic valve by echo — up to 15% are affected.

Pearl

In aortic regurgitation the balloon pump inflates into the leak: diastolic inflation drives more blood back into the ventricle.

Sources · Merck Manual Professional — Aortic Regurgitation · Otto CM et al. 2020 ACC/AHA Guideline for the Management of Patients With Valvular Heart Disease. Circulation 2021;143:e72–e227 (full text, STS-hosted PDF) · OpenAnesthesia — Aortic insufficiency: hemodynamic, medical and surgical management · emDocs — Acute valvular emergencies: pearls and pitfalls (nitroprusside ± dobutamine bridge in acute AR) · Starter sheet built from the verified AGACNP fact map (facts reviewed 2026-10-15).