Table 5: Effect of MI on the torsional and strain variables of LV.
|
Control |
MI |
p |
|
|
LV torsion (o/mm) |
0.12 ± 0.03 |
0.13 ± 0.37 |
p = 0.050 |
|
LV twist (o) |
8.32 ± 2.36 |
7.21 ± 2.54 |
NS |
|
LV systolic torsion rate (o/s) |
58.84 ± 17.38 |
52.73 ± 13.42 |
NS |
|
LV untwisting rate (o/s) |
-80.44 ± 26.23 |
-71.92 ± 24.76 |
NS |
|
BASE |
|
|
|
|
Rotation (o) |
-5.25 ± 1.50 |
-5.79 ± 1.95 |
NS |
|
Peak systolic rotation rate (o/s) |
-43.08 ± 16.37 |
-49.04 ± 16.02 |
NS |
|
Peak radial strain |
40.33 ± 13.37 |
41.66 ± 13.95 |
NS |
|
Peak systolic circumferential strain |
-12.18 ± 3.77 |
-13.18 ± 2.46 |
NS |
|
APEX |
|
|
|
|
Rotation (o) |
3.71 ± 1.77 |
2.22 ± 1.69 |
p < 0.001 |
|
Peak systolic rotation rate (o/s) |
30.63 ± 13.01 |
17.97 ± 19.09 |
NS |
|
Peak radial strain |
39.5 ± 10.77 |
18.77 ± 13.9 |
p < 0.001 |
|
Peak systolic circumferential strain |
-15.07 ± 4.71 |
-9.38 ± 3.87 |
p < 0.001 |
LV Twist (0): peak difference in systolic rotations of LV apex and base as viewed from the apex, LV Torsion (0/cm): normalized twist: twist angle divided by the distance between the measured locations of base and apex, LV Systolic Torsion Rate (0/s): peak velocity of LV Torsion, LV Untwisting Rate (0/s): peak velocity of Untwisting, Rotation (0): peak systolic Rotation of base or apex, Peak Systolic Rotation Rate (0/s): peak velocity of basal or apical Rotation, Peak Radial Strain: peak radial deformation of base or apex, Peak Systolic Circumferential Strain: circumferential deformation of base or apex.
The values are averages ± standard deviation.