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Aortic Stenosis Severity Classification:
Severity is determined based on AVA, Mean Gradient, and Velocity values.
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Aortic stenosis is a narrowing of the aortic valve opening that obstructs blood flow from the left ventricle to the aorta. It's typically assessed using three key echocardiographic parameters: aortic valve area (AVA), mean gradient, and peak velocity.
Severity classification is based on established guidelines:
Severe: AVA <1.0 cm² AND mean gradient ≥40 mmHg AND velocity ≥4.0 m/s
Moderate: AVA 1.0-1.5 cm² OR gradient 20-40 mmHg OR velocity 3.0-4.0 m/s
Mild: AVA >1.5 cm² AND gradient <20 mmHg AND velocity <3.0 m/s
Details: Accurate classification is crucial for determining treatment timing (medical vs. surgical), prognosis, and follow-up frequency.
Tips: Enter values from echocardiogram report. All values must be valid (positive numbers). Results should be interpreted in clinical context.
Q1: What if parameters suggest different severities?
A: This is "discordant grading" and may require additional testing (CT calcium scoring, dobutamine stress echo).
Q2: How often should severe AS be monitored?
A: Typically every 6-12 months, or more frequently if symptomatic.
Q3: What about low-flow, low-gradient AS?
A: This requires special consideration (dobutamine stress or CT calcium scoring).
Q4: Are there limitations to echo assessment?
A: Yes, especially in obese patients or those with poor echo windows.
Q5: When is intervention recommended?
A: For severe AS with symptoms, LV dysfunction, or abnormal stress test.