The severity grading of aortic stenosis is determined with echocardiography. While the aortic valve area is a prominent indicator of aortic stenosis severity that is often quoted in clinical practice, other criteria including mean pressure gradient, peak aortic jet velocity, indexed aortic valve area, and the dimensionless index also exist.

By peak aortic jet velocity

  • Mild: 2 to 2.9 m/s
  • Moderate: 3 to 3.9 m/s
  • Severe: 4 to 4.9 m/s
  • Very severe: ≥ 5 m/s

By mean pressure gradient

  • Mild: 0 to 19 mmHg
  • Moderate: 20 to 39 mmHg
  • Severe: 40 to 59 mmHg
  • Very severe: ≥ 60 mmHg

By aortic valve area

  • Mild: > 1.5 cm2
  • Moderate: 1.0 to 1.5 cm2
  • Severe: ≤ 1.0 cm2
  • Very severe: ≤ 1.0 cm2

By indexed aortic valve area

  • Mild: > 0.85 cm2 ÷ m2
  • Moderate: 0.60 to 0.85 cm2 ÷ m2
  • Severe: < 0.60 cm2 ÷ m2
  • Very severe: < 0.60 cm2 ÷ m2

By dimensionless index

  • Mild: > 0.50
  • Moderate: 0.25 to 0.50
  • Severe: < 0.25
  • Very severe: < 0.25

References

Matthew J Czarny and Jon R Resar. Diagnosis and Management of Valvular Aortic StenosisClinical Medicine Insights: Cardiology 8(Suppl 1): 15–24 (2014)