|
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
|
- 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
