Color-coded longitudinal interventricular septal tissue velocity imaging, strain and strain rate in healthy Doberman Pinschers

2011 ◽  
Vol 13 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Julia Simak ◽  
Lisa Keller ◽  
Markus Killich ◽  
Katrin Hartmann ◽  
Gerhard Wess
Keyword(s):  
Strain Rate ◽  
Tissue Velocity ◽  
Velocity Imaging ◽  
Strain And Strain Rate ◽  
Doberman Pinschers

scholarly journals Reproducibility and feasibility of right ventricular strain and strain rate (SR) as determined by myocardial speckle tracking during high-intensity upright exercise: a comparison with tissue Doppler-derived strain and SR in healthy human hearts

2014 ◽  
Vol 1 (1) ◽  
pp. 31-41 ◽  
Author(s):  
Rachel N Lord ◽  
Keith George ◽  
Helen Jones ◽  
John Somauroo ◽  
David Oxborough
Keyword(s):  
Right Ventricular ◽  
Strain Rate ◽  
Exercise Intensity ◽  
Speckle Tracking ◽  
Tissue Doppler ◽  
Healthy Human ◽  
Velocity Imaging ◽  
Strain And Strain Rate ◽  
Right Ventricular Strain ◽  
Progressive Exercise

This study aimed to establish feasibility for myocardial speckle tracking (MST) and intra-observer reliability of both MST and tissue velocity imaging (TVI)-derived right ventricular (RV) strain (ε) and strain rate (SR) at rest and during upright incremental exercise. RV ε and SR were derived using both techniques in 19 healthy male participants. MST-derived ε and SR were feasible at rest (85% of segments tracked appropriately). Feasibility reduced significantly with progressive exercise intensity (3% of segments tracking appropriately at 90% maximum heart rate (HRmax)). Coefficient of variations (CoVs) of global ε values at rest was acceptable for both TVI and MST (7–12%), with low bias and narrow limits of agreement. Global SR data were less reliable for MST compared with TVI as demonstrated with CoV data (systolic SR=15 and 61%, early diastolic SR=16 and 17% and late diastolic SR=26 and 31% respectively). CoVs of global RV ε and SR obtained at 50% HRmax were acceptable using both techniques. As exercise intensity increased to 70 and 90% HRmax, reliability of ε and SR values reduced with larger variability in MST. We conclude that RV global and regional ε and SR data are feasible, comparable and reliable at rest and at 50% HRmax using both MST and TVI. Reliability was reduced during higher exercise intensities with only TVI acceptable for clinical and scientific use.

scholarly journals Evaluation of Longitudinal Tissue Velocity and Deformation Imaging in Akinetic Non-viable Apical Segments of Left Ventricular Myocardium

2018 ◽  
Vol 3 (4) ◽  
Author(s):  
Hakimeh Sadeghian ◽  
Parastoo Vosoughi ◽  
Afsaneh Sadeghian ◽  
Masoumeh Lotfi-Tokaldany ◽  
Mohammad Moein Ashrafi ◽  
...  
Keyword(s):  
Strain Rate ◽  
Patient Group ◽  
Dobutamine Stress Echocardiography ◽  
Peak Systolic Velocity ◽  
Dobutamine Stress ◽  
Left Ventricular ◽  
Systolic Strain ◽  
Tissue Velocity ◽  
Strain Rate Imaging ◽  
Strain And Strain Rate

Introduction: The use of tissue velocity and strain rate imaging is proposed for the quantification of non-viable myocardium. This study is aimed at investigating the differences in tissue velocity and strain rate imaging indices between non-viable left ventricular apical segments and the normal segments using segment-by-segment comparison.Materials and Method: Thirty-two patients with akinetic left ventricular apical segments and without viability were selected using two-dimensional echocardiography and dobutamine stress echocardiography; 32 individuals with normal echocardiography and coronary angiography formed the normal group. Peak systolic velocity, peak systolic strain, and strain rate were measured in the four left ventricular apical segments and the apex 17th segment.Results: The patient group had a significantly lower ejection fraction (26.88±6.06% vs. 56.56±2.36%; p<0.001). Overall, the patient group had significantly lower resting peak systolic velocity, systolic strain, and strain rate. In the segment-by-segment comparison, only systolic strain showed a remarkable reduction in the patient group, while reduction in Sm and strain rate were not significant in all the segments. After dobutamine stress echocardiography, only systolic strain showed an insignificant increase compared to the resting values. In the apex 17th segment, Sm showed significant reduction in the patient group.Conclusion: The ST in apical segments may be used as a quantitative index for detecting akinesia both at rest and after dobutamine infusion. Reduction in Sm can be used as a marker of akinesia in the apical cap at rest.

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