Aortic Stenosis Intervention Thresholds

Classify AS as severe when transthoracic echocardiography shows Vmax at least 4.0 m/s, mean transvalvular gradient at least 40 mm Hg, and AVA at most 1.0 cm². A dimensionless index of 0.25 or less is an additional severe-AS marker. In a patient with small body size, an indexed AVA of 0.6 cm²/m² or less increases specificity for severe stenosis. JAMA+3JAMAAssociation of Time Between Left Ventricular and Aortic Systolic ...Wolters KluwerDiscordance between aortic valve gradient and area : European Heart Journal SupplementsWolters KluwerA computer vision model for the identification... : Cardiovascular Diagnosis and TherapyESCAsymptomatic patients with aortic valve stenosis: diagnosis criteria

Before labeling discordant AS as low-gradient severe disease, repeat or review the study for LVOT diameter and LVOT velocity-time integral acquisition, and ensure interrogation from nonapical windows. LVOT undermeasurement falsely reduces calculated AVA; low flow can lower Vmax and gradient despite severe fixed obstruction. Conversely, anemia, hyperthyroidism, concomitant aortic regurgitation, and other hyperdynamic states can increase gradients, while pressure recovery can overestimate severity when the sinotubular junction is under 30 mm. Wolters Kluwer+2Wolters KluwerA computer vision model for the identification... : Cardiovascular Diagnosis and TherapyESCAsymptomatic patients with aortic valve stenosis: diagnosis criteriaESCThe value of echocardiography in aortic valve disease: the essentials

An AVA below 1.0 cm² with mean gradient below 40 mm Hg occurs in approximately 20% to 30% of studies. This is not an automatic AVR indication: establish whether the patient has low flow, verify anatomic severity, then attribute symptoms before proceeding. ESC+1ESCAortic valve stenosis: evaluation and management of patients with discordant gradingESCExercise and pharmacological testing combined with echocardiography in the diagnosis of aortic valve stenosis

In low-flow, low-gradient AS with reduced LVEF, perform low-dose dobutamine stress echocardiography when clinically stable and images permit. True severe AS is supported when mean gradient rises above 40 mm Hg while AVA remains below 1.0 cm². A substantial increase in AVA with flow favors pseudo-severe stenosis and redirects evaluation toward the cause of reduced LV systolic function rather than immediate valve replacement. ESCESCExercise and pharmacological testing combined with echocardiography in the diagnosis of aortic valve stenosis

In discordant AS after measurement review, noncontrast CT aortic valve calcium scoring provides an anatomic severity check independent of flow. Severe AS is unlikely below 800 Agatston units in women or 1,600 in men, is possible above 1,200 in women or 2,000 in men, and is highly likely above 1,600 in women or 3,000 in men. Earlier validated thresholds near 1,250 to 1,275 AU in women and 2,000 to 2,065 AU in men are also used; interpret borderline values in the full clinical and echocardiographic context. Wolters Kluwer+2Wolters KluwerDiscordance between aortic valve gradient and area : European Heart Journal SupplementsESCAortic valve stenosis: evaluation and management of patients with discordant gradingESCAsymptomatic patients with aortic valve stenosis: diagnosis criteria

Once symptomatic low-gradient disease is confirmed as truly severe, treat it with AVR using the same intervention principle applied to classic severe AS. Do not use CT calcium scoring alone to establish that symptoms are valve-related; reconcile symptoms with ventricular function, flow state, and competing cardiopulmonary disease. ESCESCAortic valve stenosis: evaluation and management of patients with discordant grading

For confirmed severe AS, AVR is recommended when the patient has symptoms or LVEF below 50%. Elicit exertional dyspnea, angina, presyncope, syncope, and activity restriction against prior functional capacity; patients who have reduced activity may deny symptoms despite clinically important limitation. In low-gradient disease, intervene only after confirming true severe stenosis and linking symptoms to the valve lesion. jacc+1jaccAortic Valve Replacement for Asymptomatic Severe Aortic Stenosis: Is Enthusiasm Exceeding the Evidence?ESCAortic valve stenosis: evaluation and management of patients with discordant grading

For apparently asymptomatic severe AS with LVEF above 50% to 55%, obtain exercise testing when safe and feasible to unmask exertional symptoms or an abnormal physiologic response. A positive stress test is a guideline-supported reason to consider AVR rather than defaulting to surveillance. Clinical trials informing early intervention commonly confirmed asymptomatic status with low-level stress testing, although trial populations and procedure strategies differed. jaccjaccAortic Valve Replacement for Asymptomatic Severe Aortic Stenosis: Is Enthusiasm Exceeding the Evidence?

Additional triggers that make AVR reasonable in asymptomatic severe AS are BNP greater than three times the upper limit of normal, very severe stenosis with Vmax above 5 m/s, Vmax increase of at least 0.3 m/s per year, or another indication for open-heart surgery. Outside these features, clinical surveillance followed by delayed AVR remains the guideline default described in current reviews. jaccjaccAortic Valve Replacement for Asymptomatic Severe Aortic Stenosis: Is Enthusiasm Exceeding the Evidence?

Randomized evidence increasingly supports early SAVR or TAVR in selected asymptomatic severe AS, but this does not eliminate the need to verify that the patient is truly asymptomatic, that stenosis is severe, and that procedural choice is durable and anatomically suitable. Apply early-intervention data through multidisciplinary valve evaluation rather than treating every asymptomatic Doppler-defined severe lesion identically. jacc+1jaccAortic Valve Replacement for Asymptomatic Severe Aortic Stenosis: Is Enthusiasm Exceeding the Evidence?AHA JournalsEarly Aortic Valve Replacement of Asymptomatic Severe Aortic ...

ACC/AHA age and life-expectancy thresholds favor SAVR for patients younger than 65 years or with anticipated survival beyond 20 years, and favor TAVR for patients older than 80 years or with anticipated survival under 10 years. Patients between these groups require individualized assessment of transfemoral feasibility, native-valve anatomy, coexisting surgical disease, and the expected consequences of future valve interventions. AHA Journals+1AHA JournalsThree-Year Follow-Up of the NOTION-2 Trial: TAVR Versus SAVR to Treat Younger Low-Risk Patients With Tricuspid or Bicuspid Aortic StenosisAHA JournalsThree-Year Follow-Up of the NOTION-2 Trial: TAVR Versus SAVR to Treat Younger Low-Risk Patients With Tricuspid or Bicuspid Aortic Stenosis | Circulation

For severe symptomatic AS, transfemoral TAVR is the preferred TAVR access approach when feasible; alternative access may be considered when transfemoral access is unsuitable. Procedural choice should be made by a Heart Team and dedicated valve center, particularly when anatomy, access, or competing surgical indications complicate the decision. PubMed+1PubMedInterventional therapies for chronic heart failure: An overview of recent developments - PMCPubMedDe Ritis (AST/ALT) ratio as a predictor of early adverse outcomes following transcatheter aortic valve replacement

For low-risk patients aged 60 to 75 years with tricuspid or bicuspid AS, NOTION-2 reported similar 3-year clinical outcomes with TAVR and SAVR. This midterm equivalence should not be interpreted as durability equivalence for all younger patients, because long-term follow-up remains limited in younger low-risk populations. AHA Journals+1AHA JournalsThree-Year Follow-Up of the NOTION-2 Trial: TAVR Versus SAVR to Treat Younger Low-Risk Patients With Tricuspid or Bicuspid Aortic StenosisAHA JournalsThree-Year Follow-Up of the NOTION-2 Trial: TAVR Versus SAVR to Treat Younger Low-Risk Patients With Tricuspid or Bicuspid Aortic Stenosis | Circulation

Bicuspid AS deserves additional caution. Randomized TAVR-versus-SAVR trials in bicuspid disease have historically been lacking, and an exploratory NOTION-2 substudy in low-risk patients 70 years or younger found a higher 1-year risk of death, stroke, or rehospitalization after TAVR in the bicuspid subgroup, with an absolute risk difference of 13.8% (95% CI, 1.2% to 26.3%). Favor SAVR when bicuspid anatomy and expected longevity make procedural durability and anatomy especially consequential, unless individualized assessment supports TAVR. jacc+2jaccTemporal Trends and Outcomes of Transcatheter Versus Surgical Aortic Valve Replacement for Bicuspid Aortic Valve StenosisScienceDirectTranscatheter or surgical aortic valve replacement in patients with severe aortic stenosis aged 70 years or younger: A NOTION-2 substudy - ScienceDirectScienceDirectTranscatheter and Surgical Aortic Valve Replacement in Patients With Bicuspid Aortic Valve Stenosis - ScienceDirect

Tradeoffs should be explicit. In a propensity-matched administrative analysis of bicuspid AS, TAVR and SAVR had similar in-hospital mortality, while TAVR was associated with less acute myocardial infarction, postoperative bleeding, vascular complications, discharge to a nursing facility, and shorter hospitalization; TAVR had more complete heart block and permanent pacemaker implantation. These observational findings guide discussion but do not replace randomized evidence in bicuspid anatomy. jaccjaccTemporal Trends and Outcomes of Transcatheter Versus Surgical Aortic Valve Replacement for Bicuspid Aortic Valve Stenosis

For asymptomatic severe AS without an early-intervention trigger, continue clinical surveillance rather than passive observation. At each reassessment, document exertional capacity, repeat LVEF assessment, compare Vmax with prior studies, and obtain BNP when its result would alter the timing decision. Escalate to AVR evaluation if LVEF falls below 50%, exercise testing becomes positive, BNP exceeds three times the upper limit of normal, Vmax exceeds 5 m/s, or Vmax rises by at least 0.3 m/s per year. jaccjaccAortic Valve Replacement for Asymptomatic Severe Aortic Stenosis: Is Enthusiasm Exceeding the Evidence?

Repeat echo interpretation must account for changing flow state and acquisition quality. A new AVA-gradient discrepancy should prompt reassessment of LVOT measurement, Doppler windows, blood pressure and loading conditions, stroke-volume index, and, when unresolved, CT calcium scoring or stress echocardiography according to the low-gradient phenotype. Wolters Kluwer+4Wolters KluwerA computer vision model for the identification... : Cardiovascular Diagnosis and TherapyESCAortic valve stenosis: evaluation and management of patients with discordant gradingESCExercise and pharmacological testing combined with echocardiography in the diagnosis of aortic valve stenosisESCAsymptomatic patients with aortic valve stenosis: diagnosis criteriaESCThe value of echocardiography in aortic valve disease: the essentials

Refer patients reaching an intervention threshold to a multidisciplinary valve program before the procedure choice is finalized. The referral should include symptom and exercise-test documentation, complete Doppler data, LVEF, flow classification, CT calcium data when obtained, vascular-access assessment for TAVR, and valve morphology, particularly bicuspid anatomy. PubMed+1PubMedInterventional therapies for chronic heart failure: An overview of recent developments - PMCPubMedDe Ritis (AST/ALT) ratio as a predictor of early adverse outcomes following transcatheter aortic valve replacement