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Table 2 The hemodynamic response and the response in strain parameters to 10 and 20 μg · kg-1· min-1 of dobutamine

From: Cardiovascular magnetic resonance myocardial feature tracking detects quantitative wall motion during dobutamine stress

Parameter Level of Dobutamine (μg/kg-1/min-1) Significance: Paired t-test
  Rest 10 20 Rest-10 Rest-20 10-20
Heart Rate (bpm) 68.6 ± 11.9 87.1 ± 15.5 115.7 ± 11.1 <0.05 <0.05 <0.05
Mean BP (mmHg) 91.5 ± 10.2 98.6 ± 10.4 102.9 ± 10.7 <0.05 <0.05 <0.05
LV-CI (l/min/m 2 ) 3.0 ± 0.6 4.8 ± 0.8 5.7 ± 0.8 <0.05 <0.05 <0.05
RV-CI (l/min/m 2 ) 3.0 ± 0.6 4.7 ± 0.8 5.8 ± 4.0 <0.05 <0.05 <0.05
LV-EDV (ml/m 2 ) 76.9 ± 12.5 75.0 ± 12.5 64.5 ± 11.5 0.25 <0.05 <0.05
LV-ESV (ml/m 2 ) 33.4 ± 7.5 22.1 ± 7.3 15.2 ± 5.0 <0.05 <0.05 <0.05
LV-SV (ml/m 2 ) 43.5 ± 6.5 52.9 ± 10.6 49.3 ± 8.0 <0.05 <0.05 0.06
LV-EF (%) 56.9 ± 4.4 70.7 ± 8.1 76.8 ± 4.6 <0.05 <0.05 <0.05
Err SAX 19.6 ± 14.6 31.8 ± 20.9 42.4 ± 25.5 <0.05 <0.05 <0.05
Ecc SAX -24.1 ± 6.7 -32.7 ± 11.4 -39.2 ± 15.2 <0.05 <0.05 <0.05
  1. The table shows the hemodynamic response and the response in strain parameters to 10 and 20 μg · kg-1· min-1 of dobutamine. Volumetric values were indexed for body surface area and expressed as mean ± standard deviation. Paired t-test was used to determine the significance of change from one level of dobutamine to next (p < 0.05). LV = left ventricle SV = stroke volume ESV = end-systolic volume EDV = end-diastolic volume, EF = ventricular ejection fraction, Err SAX = left ventricular short-axis radial strain; Ecc SAX = left ventricular short-axis circumferential strain