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Table 2 Types of hemodynamic response during low-dose DSE in patients with low flow (stroke volume index < 35 ml/m2), low gradient (mean pressure gradient < 40 mmHg) and low left ventricular ejection fraction (< 50%) severe aortic stenosis (aortic valve area < 1.0 cm2)

From: The clinical significance of the incorporation of tissue Doppler imaging into low-dose Dobutamine stress echocardiography in patients with aortic stenosis prior to Transcatheter aortic valve implantation

  Stroke volume and ejection fraction Mean pressure gradient Aortic valve area Interpretation
A Severe AS
B Moderate AS
C Severe AS, severe LV dysfunction
  1. AS aortic stenosis, LV left ventricular, DSE dobutamine stress echocardiography