Aortic Stenosis Diagnosis and Management
Diagnostic Criteria
- The American College of Cardiology and European Heart Society recommend that severe aortic stenosis be diagnosed based on a valve area ≤1.0 cm², mean gradient ≥40 mmHg, or peak velocity ≥4.0 m/sec 1, 2, 3, 4
- A peak velocity of <4.0 m/sec and mean gradient of <40 mmHg are indicative of non-severe aortic stenosis, with a peak velocity of 2.06 m/sec and mean gradient of 9.2 mmHg suggesting mild aortic stenosis 1, 2, 5, 4
Management Approach
- The American College of Cardiology recommends that patients with asymptomatic mild-to-moderate aortic stenosis be managed conservatively with surveillance, including serial echocardiography every 1-2 years for moderate stenosis or every 3-5 years for mild stenosis 1, 5
- If low-flow, low-gradient severe aortic stenosis is suspected, dobutamine stress echocardiography is required to differentiate true severe stenosis from pseudosevere stenosis 2, 3, 4
- Intervention, such as surgical aortic valve replacement (SAVR) or transcatheter aortic valve replacement (TAVR), is only indicated if severe aortic stenosis is confirmed and the patient has developed symptoms, has an abnormal exercise stress test, or requires other cardiac surgery 1, 2, 3, 5
Treatment Options
- The European Heart Society recommends SAVR for low-to-moderate surgical risk patients with confirmed severe symptomatic stenosis 5
- TAVR is recommended for high surgical risk, elderly, or significantly frail patients with confirmed severe symptomatic stenosis 2, 3, 5
TAVI Indications and Contraindications
Introduction to TAVI Guidelines
- The European Society of Cardiology recommends that TAVI should only be performed in patients with confirmed severe aortic stenosis, not moderate stenosis, according to current evidence-based guidelines 6, 7, 8
Severity Confirmation Required
- The European Society of Cardiology explicitly restricts TAVI to severe aortic stenosis, defined by specific hemodynamic criteria 7, 8
The Only Exception: Concomitant Cardiac Surgery
- The European Society of Cardiology recommends that surgical aortic valve replacement (SAVR) should be considered for moderate AS during concomitant cardiac surgery after Heart Team discussion (Class IIa, Level C) 9, 10
- The decision to perform SAVR for moderate AS during concomitant cardiac surgery requires multidisciplinary Heart Team agreement 9, 10
Why TAVI Requires Severe Stenosis
- The evidence base for TAVI exclusively studied severe symptomatic aortic stenosis, and all landmark TAVI trials enrolled only patients with severe AS 7, 8