Skip to main content

Table 1 Measures of resting and low-dose dobutamine stress echocardiography in a patient with low flow, low gradient, low EF aortic stenosis

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

Echocardiographic parameters Resting Stage I
5 μ/kg/min
Stage II
10 μ/kg/min
Stage III
15 μ/kg/min
Stage IV
20 μ/kg/min
Heart rate (beat per minute) 52 54 53 55 60
Peak aortic jet velocity (m/s) 2.6 2.6 3.0 3.0 3.4
Mean pressure gradient (mmHg) 16 17 22 22 26
Peak LVOT velocity (m/s) 0.69 0.73 0.93 0.93 1.04
Aortic valve area (cm2) 0.93 0.82 1.02 1.06 1.07
Stroke volume index (ml/m2) 32 31 39 40 43
Systolic ejection time (ms) 346 343 322 323 300
Flow rate (ml/s) 168 159 208 217 255
LV ejection fraction (%) 42 NA NA NA 50
Septal S′ (cm/s) 6 NA NA NA 8
Lateral annular S′ (cm/s) 7 NA NA NA 12
  1. Left ventricular outflow track (LVOT) diameter 2.1 cm