Post-Valve Replacement Gradient Interpretation

Diagnostic Considerations

• The American College of Cardiology recommends assessing flow state by measuring stroke volume index (SVI); if SVI <35 mL/m², the gradient may underestimate true obstruction severity, whereas high-flow states can artificially elevate gradients 1, 2
• The American College of Cardiology suggests confirming proper Doppler technique and ruling out technical errors, such as LVOT acceleration from septal hypertrophy, which can falsely elevate calculated gradients 1

Patient-Prosthesis Mismatch Evaluation

• Calculating the indexed effective orifice area (EOAi) is essential to identify mismatch, as recommended by the American College of Cardiology, with EOAi <0.85 cm²/m² indicating moderate mismatch and EOAi <0.65 cm²/m² indicating severe mismatch 2

Clinical Management

• The American College of Cardiology recommends that if symptomatic despite the moderate gradient, consider invasive catheterization to confirm true gradient, evaluate for mismatch, and assess for other causes of symptoms 3, 4, 2
• Optimizing volume status, treating anemia, and considering dobutamine stress echo to assess flow reserve is recommended for patients with low-flow state (SVI <35 mL/m²) 4, 2