Abstract 9813: Verifying Cardiac Mechanics From 3D-Wall Motion Tracking Processed for Rotation Determination
Background: This study assessed 3D-Wall Motion Tracking (3D-WMT) for determining rotation of a pumped heart model.
Methods: Latex balloons were sutured inside the LV of 10 pig hearts and attached to a pulsatile pump. The heart phantom and a Toshiba Matrix Array PST-25SX 2.5 MHz Transducer were fixed within a water filled tank. The hearts were firmly attached to a rotating plate at the base and lightly affixed at the apex, and pumped at a stroke volume of 50ml while the base of the heart was variably rotated at 0, 3,5,7,10,12 and 15 degrees. Three images were acquired at each rotation setting and a 3D WMT program was used to assess cardiac rotation.
Results: The 3D-WMT derived rotation angles were found to be most precise at physiologically normal values (3-5°), but consistently underestimated at angles greater than 5°. For the 3D-WMT calculated rotation, the mean and standard deviation at 0°,3°,5°,7°,10°,12°,15° was 1.049° ± 0.688°, 2.80° ± 0.647°, 4.178° ± 0.835°, 5.723° ± 0.851°,7.809° ± 0.815°, 9.131° ± 1.481°,11.144° ± 1.307°, respectively. The P value is less than 0.0001 A Bland Altman plot showed 96% of data were within a 95% confidence interval and a slight underestimation.
Conclusions: Despite observed underestimation at higher degrees of rotation, Toshiba 3D-WMT may provide clinically important determinations of LV rotation.
- © 2013 by American Heart Association, Inc.