Aortic regurgitation: acute and chronic
Stem
A 61-year-old man, 88 kg, with a bicuspid aortic valve and chronic severe aortic regurgitation, is scheduled for open right hemicolectomy for colon cancer. He climbs two flights of stairs without symptoms. Echo last month: LVEF 58%, LV end-systolic dimension 46 mm, ascending aorta 44 mm. Blood pressure is 162/46, heart rate 62 in sinus rhythm. He takes amlodipine and losartan.
Question
What are your hemodynamic goals, and how will you anesthetize him?
Ideal answer
HeadlineThis is a volume-loaded ventricle: I keep him fast, full and forward, with a rate of 80–100, preload kept up and afterload kept low.1
- Arterial line before induction, because his diastolic pressure of 46 drives his coronary perfusion, and I need it beat to beat.1
- Titrated induction with glycopyrrolate or ephedrine ready, because bradycardia lengthens diastole and with it the time blood falls back into the ventricle.1
- Keep him full, because the dilated ventricle needs its volume to keep forward stroke volume; I replace losses against the arterial trace.
- Treat hypertension with depth or a vasodilator, because a higher afterload raises the regurgitant fraction; if he needs support I use ephedrine or low-dose epinephrine, not phenylephrine.1
Watch for: a falling diastolic pressure with ST depression, which is subendocardial ischemia, and any slowing of the rate.
Breaking down the answer
- Why he is not cancelled — severe AR earns valve surgery before elective intermediate- or high-risk surgery if symptomatic, LVEF 55% or less, or end-systolic dimension above 50 mm (index above 25 mm/m²).2,3 He meets none. Changes if: dyspnea or a falling EF.
- The physiology of "fast" — regurgitant volume depends on diastolic time and the aorta-to-LV gradient. Ischemia risk is real: low diastolic pressure plus high wall tension.1 Changes if: coronary disease, present in about 20% with severe AR;3 then I settle near 80.
- Drug choices — phenylephrine raises afterload and slows the heart reflexly: both wrong. For contractility, low-dose epinephrine, dobutamine or milrinone; nitroglycerin for volume overload; nitroprusside or a calcium-channel blocker for hypertension.1
- Neuraxial is allowed — an epidural for analgesia is fine if I dose it slowly, because venodilation cuts preload; ephedrine rather than phenylephrine treats the hypotension.1 Changes if: acute AR, where I avoid anything that drops preload.
- The aorta, not just the valve — a bicuspid valve with significant AR carries an aortopathy in up to 40%.4 At 44 mm I blunt the surges at laryngoscopy and extubation. Changes if: new chest or back pain, which is dissection until proven otherwise.
- Grading on TEE if asked — severe means vena contracta above 6 mm, central jet width 65% or more of the LVOT, regurgitant fraction 50% or more,3 or pressure half-time under 200 ms.5
- Where I look — in the midesophageal long axis the diastolic jet comes off the cusps into the LVOT and I measure its neck; holodiastolic flow reversal in the descending thoracic or abdominal aorta means severe AR.3,5
The first loop shows moderate AR; the second, severe: jet ≥65% of LVOT, vena contracta >6 mm.
Follow-up question
On postoperative day 2 he develops sudden tearing chest pain. Blood pressure is 84/38, heart rate 124, and he has crackles to the mid-zones. Bedside TEE shows an intimal flap in the ascending aorta and a new, wide regurgitant jet. The cardiologist wants to place an intra-aortic balloon pump. What do you do?
Follow-up answer
HeadlineThis is type A dissection with acute severe AR and cardiogenic shock; I tell the team no balloon pump and call cardiac surgery now.
Diastolic balloon inflation drives more blood back through the valve, so it is contraindicated.3 Acute AR needs prompt valve surgery, without delay when he is hypotensive or in pulmonary edema.5 Until the knife, I support forward flow: rate kept up, dobutamine or low-dose epinephrine,1 no beta-blocker, because in hypotension it removes his compensatory tachycardia, and small induction doses with the surgeon scrubbed. On TEE I look for tamponade and a new wall motion abnormality from coronary involvement, then reassess pressure, lactate and the jet after each change.
Pitfalls that cost points
- Expecting the classic signs: acute AR gives a narrow pulse pressure and a soft or absent murmur, so the lesion hides.3,5
- Giving cardioplegia into the aortic root: it leaks into the ventricle; retrograde or direct ostial delivery is needed.1
- Reaching for an LVAD as a bridge: regurgitation recirculates its output.1
Rapid-fire
Q: Why is the pulse pressure wide in chronic AR? A: Large forward stroke volumes raise systolic pressure while regurgitant runoff drops diastolic pressure.3
Q: Why is acute AR tolerated so badly? A: The ventricle has no time to dilate, so its diastolic pressure climbs fast, causing pulmonary edema and low cardiac output.3
Q: What are the main causes of acute AR? A: Infective endocarditis and dissection of the ascending aorta.3
Q: Why is a beta-blocker a problem in AR? A: It removes the compensatory tachycardia and prolongs diastole; it is avoided in acute AR, and even in dissection used only cautiously and never in hypotension.3,5
Numbers to know
| Item | Value |
|---|---|
| Heart rate goal | 80–100 bpm1 |
| Severe AR: vena contracta | >6 mm3 |
| Severe AR: jet width / LVOT | ≥65%3 |
| Severe AR: regurgitant volume, fraction | ≥60 mL/beat, ≥50%3 |
| Severe AR: pressure half-time | <200 ms5 |
| Intervention, asymptomatic severe AR | LVEF ≤55% or LVESD >50 mm3 |
Links
- Aortic stenosis, Mitral regurgitation and mitral stenosis, Aortic dissection, Basic valvular lesions on 2D and color, Preoperative cardiac evaluation for non-cardiac surgery, Vasopressors and inotropes: choosing and titrating
- Atlas: Basic valvular lesions on 2D and color; The 11 TEE views
- 2020 ACC/AHA Guideline for the Management of Patients With Valvular Heart Disease
Sources
- 1.Aortic Insufficiency: Hemodynamic Management, Medical and Surgical Management · OpenAnesthesia (IARS), 2023 · openanesthesia.orgHemodynamic goals (HR 80-100), drug choices, IABP and LVAD limits, neuraxial caution, cardioplegia route, ACC/AHA 2020 surgical indications.
- 2.Perioperative Management of Valvular Heart Disease in Patients Undergoing Non-Cardiac Surgery · Journal of Clinical Medicine, 2024 · ebi.ac.ukACC/AHA and ESC approach to AR before non-cardiac surgery.
- 3.Aortic Regurgitation · Merck Manual Professional Edition · merckmanuals.comCauses of acute AR, echo criteria for severe chronic AR, IABP contraindication, intervention thresholds, CAD prevalence.
- 4.Aortic Insufficiency: Etiology, Pathophysiology, and Clinical Presentation · OpenAnesthesia (IARS), 2023 · openanesthesia.org
- 5.Aortic Regurgitation: An Updated Review of Etiologies, Diagnostic Strategies, and Clinical Management · Reviews in Cardiovascular Medicine (Gill et al.), 2025 · ebi.ac.ukAcute AR presentation, pressure half-time grading, no delay to surgery when unstable, beta-blocker caution outside dissection.
Facts on this page were checked against these sources on Oct 22, 2026. Guidelines change; confirm doses against current institutional protocols.