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Table 3 The response in strain parameters to 10 and 20 μg · kg-1· min-1 of dobutamine on a segmental basis

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
Err SAX Average 19.6 ± 14.6 31.8 ± 20.9 42.4 ± 25.5 <0.05 <0.05 <0.05
Err SAX Segment 7 27.3 ± 16 33.1 ± 20 50.2 ± 29 0.4 <0.05 0.1
Err SAX Segment 8 13 ± 9.5 22.6 ± 11.5 28.2 ± 15.2 <0.05 <0.05 0.2
Err SAX Segment 9 11.1 ± 9.9 17.6 ± 13.4 22 ± 17 0.08 <0.05 0.3
Err SAX Segment 10 16.8 ± 12 31.7 ± 20.3 37.2 ± 19.2 <0.05 <0.05 0.22
Err SAX Segment 11 21.6 ± 15.9 42.7 ± 20 55.8 ± 19.1 <0.05 <0.05 <0.05
Err SAX Segment 12 27.7 ± 16.1 43.4 ± 26.6 60.7 ± 28.1 0.1 <0.05 0.18
Ecc SAX Average -24.1 ± 6.7 -32.7 ± 11.4 -39.2 ± 15.2 <0.05 <0.05 <0.05
Ecc SAX Segment 7 -21.7 ± 6.9 -24.2 ± 6.3 -28.9 ± 16 0.29 0.2 0.2
Ecc SAX Segment 8 -20.2 ± 8.2 -25.9 ± 12.4 -33.9 ± 18 0.06 <0.05 0.09
Ecc SAX Segment 9 -22.8 ± 6.9 -35.7 ± 9 -42.1 ± 9.8 <0.05 <0.05 0.1
Ecc SAX Segment 10 -26.7 ± 5.5 -36.6 ± 8.8 -38.8 ± 16.3 0.09 0.06 0.55
Ecc SAX Segment 11 -29.1 ± 4.7 -38.1 ± 13.2 -47 ± 9.5 <0.05 <0.05 0.09
Ecc SAX Segment 12 -23.8 ± 4.3 -35.9 ± 10.9 -44.2 ± 14.9 0.09 <0.05 0.06
  1. The table shows the response in strain parameters to 10 and 20 μg · kg-1· min-1 of dobutamine on a segmental basis derived from mid-ventricular short-axis view containing both papillary muscles. Values are expressed as mean ± standard deviation. Paired t-test was used to determine the significance of change from one level of dobutamine to the next one (p < 0.05). Err SAX = left ventricular short-axis radial strain; Ecc SAX = left ventricular short-axis circumferential strain