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Hisham Dokainish - One of the best experts on this subject based on the ideXlab platform.
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color tissue Doppler myocardial velocities consistently underestimate spectral tissue Doppler velocities impact on calculation peak transmitral pulsed Doppler Velocity early diastolic tissue Doppler Velocity e ea
Journal of The American Society of Echocardiography, 2006Co-Authors: Marti Mcculloch, William A Zoghbi, Robert E Davis, Christopher R Thomas, Hisham DokainishAbstract:Background Color tissue Doppler (TD) measures mean myocardial velocities, whereas spectral TD measures peak velocities. Given that most data on left ventricular (LV) diastolic function used spectral TD, we investigated whether the differences in myocardial velocities between these modalities resulted in discrepancies in calculated E/Ea. Methods Patients were imaged using an ultrasound machine. The systolic (Sa), early diastolic (Ea), and late diastolic (Aa) myocardial velocities by color and spectral TD were measured at basal and midsegments of the LV septal, lateral, inferior, and anterior walls in the apical views. The average of basal septal and lateral Ea was combined with the early transmitral diastolic Velocity (E) to obtain E/Ea. Results In all, 31 patients were imaged, with a mean LV ejection fraction of 47.7% ± 19.9. There were significant correlations between Sa, Ea, and Aa by color and spectral TD at all sites ( R = 0.92, P R = 0.85, P P P Conclusions Although significant correlations exist, myocardial velocities measured using color TD significantly underestimate velocities by spectral TD. Consequently, E/Ea by color TD significantly overestimates E/Ea using spectral TD, which could lead to errors in assessment of LV diastolic function.
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color tissue Doppler myocardial velocities consistently underestimate spectral tissue Doppler velocities impact on calculation peak transmitral pulsed Doppler Velocity early diastolic tissue Doppler Velocity e ea
Journal of The American Society of Echocardiography, 2006Co-Authors: Marti Mcculloch, William A Zoghbi, Robert E Davis, Christopher R Thomas, Hisham DokainishAbstract:Background Color tissue Doppler (TD) measures mean myocardial velocities, whereas spectral TD measures peak velocities. Given that most data on left ventricular (LV) diastolic function used spectral TD, we investigated whether the differences in myocardial velocities between these modalities resulted in discrepancies in calculated E/Ea. Methods Patients were imaged using an ultrasound machine. The systolic (Sa), early diastolic (Ea), and late diastolic (Aa) myocardial velocities by color and spectral TD were measured at basal and midsegments of the LV septal, lateral, inferior, and anterior walls in the apical views. The average of basal septal and lateral Ea was combined with the early transmitral diastolic Velocity (E) to obtain E/Ea. Results In all, 31 patients were imaged, with a mean LV ejection fraction of 47.7% ± 19.9. There were significant correlations between Sa, Ea, and Aa by color and spectral TD at all sites ( R = 0.92, P R = 0.85, P P P Conclusions Although significant correlations exist, myocardial velocities measured using color TD significantly underestimate velocities by spectral TD. Consequently, E/Ea by color TD significantly overestimates E/Ea using spectral TD, which could lead to errors in assessment of LV diastolic function.
William A Zoghbi - One of the best experts on this subject based on the ideXlab platform.
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color tissue Doppler myocardial velocities consistently underestimate spectral tissue Doppler velocities impact on calculation peak transmitral pulsed Doppler Velocity early diastolic tissue Doppler Velocity e ea
Journal of The American Society of Echocardiography, 2006Co-Authors: Marti Mcculloch, William A Zoghbi, Robert E Davis, Christopher R Thomas, Hisham DokainishAbstract:Background Color tissue Doppler (TD) measures mean myocardial velocities, whereas spectral TD measures peak velocities. Given that most data on left ventricular (LV) diastolic function used spectral TD, we investigated whether the differences in myocardial velocities between these modalities resulted in discrepancies in calculated E/Ea. Methods Patients were imaged using an ultrasound machine. The systolic (Sa), early diastolic (Ea), and late diastolic (Aa) myocardial velocities by color and spectral TD were measured at basal and midsegments of the LV septal, lateral, inferior, and anterior walls in the apical views. The average of basal septal and lateral Ea was combined with the early transmitral diastolic Velocity (E) to obtain E/Ea. Results In all, 31 patients were imaged, with a mean LV ejection fraction of 47.7% ± 19.9. There were significant correlations between Sa, Ea, and Aa by color and spectral TD at all sites ( R = 0.92, P R = 0.85, P P P Conclusions Although significant correlations exist, myocardial velocities measured using color TD significantly underestimate velocities by spectral TD. Consequently, E/Ea by color TD significantly overestimates E/Ea using spectral TD, which could lead to errors in assessment of LV diastolic function.
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color tissue Doppler myocardial velocities consistently underestimate spectral tissue Doppler velocities impact on calculation peak transmitral pulsed Doppler Velocity early diastolic tissue Doppler Velocity e ea
Journal of The American Society of Echocardiography, 2006Co-Authors: Marti Mcculloch, William A Zoghbi, Robert E Davis, Christopher R Thomas, Hisham DokainishAbstract:Background Color tissue Doppler (TD) measures mean myocardial velocities, whereas spectral TD measures peak velocities. Given that most data on left ventricular (LV) diastolic function used spectral TD, we investigated whether the differences in myocardial velocities between these modalities resulted in discrepancies in calculated E/Ea. Methods Patients were imaged using an ultrasound machine. The systolic (Sa), early diastolic (Ea), and late diastolic (Aa) myocardial velocities by color and spectral TD were measured at basal and midsegments of the LV septal, lateral, inferior, and anterior walls in the apical views. The average of basal septal and lateral Ea was combined with the early transmitral diastolic Velocity (E) to obtain E/Ea. Results In all, 31 patients were imaged, with a mean LV ejection fraction of 47.7% ± 19.9. There were significant correlations between Sa, Ea, and Aa by color and spectral TD at all sites ( R = 0.92, P R = 0.85, P P P Conclusions Although significant correlations exist, myocardial velocities measured using color TD significantly underestimate velocities by spectral TD. Consequently, E/Ea by color TD significantly overestimates E/Ea using spectral TD, which could lead to errors in assessment of LV diastolic function.
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application of the continuity equation and valve resistance to the evaluation of st jude medical prosthetic aortic valve dysfunction
American Journal of Cardiology, 1997Co-Authors: Robert M Saad, John Barbetseas, Leopoldo Olmos, Nelly Rubio, William A ZoghbiAbstract:Doppler echocardiography was applied to the assessment of patients with surgically documented St. Jude medical aortic valve dysfunction. Derivation of effective orifice area and Doppler Velocity index with the continuity equation and calculation of valve resistance accurately differentiated stenotic from regurgitant and normal valves.
Marti Mcculloch - One of the best experts on this subject based on the ideXlab platform.
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color tissue Doppler myocardial velocities consistently underestimate spectral tissue Doppler velocities impact on calculation peak transmitral pulsed Doppler Velocity early diastolic tissue Doppler Velocity e ea
Journal of The American Society of Echocardiography, 2006Co-Authors: Marti Mcculloch, William A Zoghbi, Robert E Davis, Christopher R Thomas, Hisham DokainishAbstract:Background Color tissue Doppler (TD) measures mean myocardial velocities, whereas spectral TD measures peak velocities. Given that most data on left ventricular (LV) diastolic function used spectral TD, we investigated whether the differences in myocardial velocities between these modalities resulted in discrepancies in calculated E/Ea. Methods Patients were imaged using an ultrasound machine. The systolic (Sa), early diastolic (Ea), and late diastolic (Aa) myocardial velocities by color and spectral TD were measured at basal and midsegments of the LV septal, lateral, inferior, and anterior walls in the apical views. The average of basal septal and lateral Ea was combined with the early transmitral diastolic Velocity (E) to obtain E/Ea. Results In all, 31 patients were imaged, with a mean LV ejection fraction of 47.7% ± 19.9. There were significant correlations between Sa, Ea, and Aa by color and spectral TD at all sites ( R = 0.92, P R = 0.85, P P P Conclusions Although significant correlations exist, myocardial velocities measured using color TD significantly underestimate velocities by spectral TD. Consequently, E/Ea by color TD significantly overestimates E/Ea using spectral TD, which could lead to errors in assessment of LV diastolic function.
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color tissue Doppler myocardial velocities consistently underestimate spectral tissue Doppler velocities impact on calculation peak transmitral pulsed Doppler Velocity early diastolic tissue Doppler Velocity e ea
Journal of The American Society of Echocardiography, 2006Co-Authors: Marti Mcculloch, William A Zoghbi, Robert E Davis, Christopher R Thomas, Hisham DokainishAbstract:Background Color tissue Doppler (TD) measures mean myocardial velocities, whereas spectral TD measures peak velocities. Given that most data on left ventricular (LV) diastolic function used spectral TD, we investigated whether the differences in myocardial velocities between these modalities resulted in discrepancies in calculated E/Ea. Methods Patients were imaged using an ultrasound machine. The systolic (Sa), early diastolic (Ea), and late diastolic (Aa) myocardial velocities by color and spectral TD were measured at basal and midsegments of the LV septal, lateral, inferior, and anterior walls in the apical views. The average of basal septal and lateral Ea was combined with the early transmitral diastolic Velocity (E) to obtain E/Ea. Results In all, 31 patients were imaged, with a mean LV ejection fraction of 47.7% ± 19.9. There were significant correlations between Sa, Ea, and Aa by color and spectral TD at all sites ( R = 0.92, P R = 0.85, P P P Conclusions Although significant correlations exist, myocardial velocities measured using color TD significantly underestimate velocities by spectral TD. Consequently, E/Ea by color TD significantly overestimates E/Ea using spectral TD, which could lead to errors in assessment of LV diastolic function.
Takashi Akasaka - One of the best experts on this subject based on the ideXlab platform.
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abstract 11836 deceleration time of early diastolic Velocity of mitral annulus by tissue Doppler image a novel index of left ventricular end diastolic pressure
Circulation, 2012Co-Authors: Kazushi Takemoto, Kumiko Hirata, Takashi Tanimoto, Takashi Kubo, K Ishibashi, Takashi Yamano, Yasushi Ino, Toshio Imanishi, Takashi AkasakaAbstract:PURPOSE: This study aimed to examine the diagnostic utility of the deceleration time (DT) of early diastolic Velocity of mitral annulus by tissue Doppler Velocity image, a method for the assessment...
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automated quantification of aortic regurgitant volume and regurgitant fraction using the digital colour Doppler Velocity profile integration method in patients with aortic regurgitation
Heart, 2002Co-Authors: Yumiko Miyake, Takeshi Hozumi, I Mori, Kenichi Sugioka, Atsushi Yamamuro, Takashi Akasaka, Shunichi Homma, Kiyoshi Yoshida, Junichi YoshikawaAbstract:Background: The recently introduced automated cardiac flow measurement (ACM) technique provides a quick and an accurate automated calculation of stroke volume and cardiac output. This is obtained by spatio-temporal integration of digital Doppler Velocity profile data. Objective: To evaluate the use of the ACM method in the non-invasive assessment of aortic regurgitant volume and per cent regurgitant fraction (%RF) in patients with aortic regurgitation. Methods: Aortic outflow volume and mitral inflow volume were calculated by the ACM method in 22 patients with isolated aortic regurgitation. Aortic regurgitant volume and %RF were calculated using the following equations: aortic regurgitant volume = [aortic outflow volume] − [mitral inflow volume]; %RF = [aortic regurgitant volume]/[aortic outflow volume] × 100. The results were compared with those obtained using pulsed Doppler cross sectional echocardiography (PD-2D). Results: Aortic regurgitant volumes measured by the ACM method showed a good correlation with the PD-2D measurements ( r = 0.95, y = 0.9x + 3.9, SEE = 8.6 ml); the mean (SD) difference between the two methods was −1.5 (8.5) ml. %RF estimated by the ACM method also correlated well with the values obtained by the PD-2D method ( r = 0.91, y = 0.9x + 4.9, SEE = 6.0%); the mean difference between the two methods was −1.5 (6.0)%. Total time required for aortic regurgitant volume (for one cardiac cycle) by the ACM method was significantly shorter than by the PD-2D method (130 (16) v 230 (32) s, p Conclusions: The newly developed the ACM method is quick and accurate in the automated assessment of aortic regurgitant volume and per cent regurgitant fraction in patients with isolated aortic regurgitation.
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automated assessment of mitral regurgitant volume and regurgitant fraction by a newly developed digital color Doppler Velocity profile integration method
American Journal of Cardiology, 1997Co-Authors: Takeshi Hozumi, Atsushi Yamamuro, Takashi Akasaka, Kiyoshi Yoshida, Tsutomu Takagi, Toshikazu Yagi, Junichi YoshikawaAbstract:Recent development of the automated cardiac flow measurement (ACFM) method has provided automated measurement of stroke volume and cardiac output by spatial and temporal integration of digital Doppler Velocity profile data. The purpose of this study was to evaluate the clinical usefulness of the ACFM method using digital color Doppler Velocity profile integration in the assessment of mitral regurgitant volume and regurgitant fraction from measurements of both aortic outflow and mitral inflow volumes. We calculated both aortic outflow and mitral inflow volumes from the apical approach with the ACFM and pulsed Doppler (PD) methods in 20 patients with isolated mitral regurgitation. Mitral regurgitant volume and regurgitant fraction were calculated by the following equation: mitral regurgitant volume = (mitral inflow volume) - (aortic outflow volume), % regurgitant fraction = (mitral regurgitant volume)/(mitral inflow volume) x 100. Mitral regurgitant volume and regurgitant fraction were compared with that determined by the PD method. Mitral regurgitant volume measurement by the ACFM method showed a good correlation with that measured by the PD method (r = 0.90, y = 0.77x + 11.6, SEE = 9.0 ml); the mean differences between PD and ACFM measurements was -1.7 +/- 12.5 ml. Regurgitant fraction estimated by the ACFM method correlated well with that of the PD method (r = 0.92, y = 0.98x + 2.1, SEE = 8.8%). The mean difference for the measurement of regurgitant fraction between the PD and ACFM methods was 0.8 +/- 6.6%. Total time required for mitral regurgitant volume calculation in 1 cardiac cycle by the ACFM method was significantly shorter than that of the PD method (126 +/- 15 seconds vs 228 +/- 36 seconds, p <0.01). In conclusion, the newly developed ACFM method is simple, quick, and accurate in the automated assessment of mitral regurgitant volume and regurgitant fraction.
Guy Armstrong - One of the best experts on this subject based on the ideXlab platform.
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use of peak systolic strain as an index of regional left ventricular function comparison with tissue Doppler Velocity during dobutamine stress and myocardial ischemia
Journal of The American Society of Echocardiography, 2000Co-Authors: Agnes Pasquet, Guy Armstrong, Kiyotaka Fukamachi, Lisa Cardon, Bjorn OlstadAbstract:Abstract Objectives: The goals of this study were to examine peak systolic strain as an index of regional function in an animal model of inotropic stress and ischemia, and to compare these results with peak systolic myocardial tissue Doppler Velocity (MDV). Background: Myocardial tissue Doppler Velocity is an objective measure of regional left ventricular responses to inotropic stimulation and ischemia, but it is affected by tethering from adjacent segments and translational movement. Myocardial Doppler strain ( ϵ, relative change in length) is a more local measure of contractility, which can now be derived noninvasively from MDV. Methods: Eight dogs underwent graded dobutamine infusion followed by coronary occlusion. Epicardial 2-dimensional echocardiography and color MDV of the left ventricle were obtained and digitized from the short-axis view at baseline and with dobu-tamine doses of 2, 4, and 8 μg/kg per minute. These were repeated 0, 10, 20, 45, and 90 seconds after occlusion of the left anterior descending artery (LAD) (n = 3) or circumflex coronary artery (n = 5). Dobutamine was continued at 8 μg/kg per minute during coronary occlusion. The peak systolic radial MDV (cm/s) and systolic strain (ϵ s , percent thickening) in the anterior and posterior walls were measured off-line at each stage. Results: Dobutamine caused an increase in MDV ( P =.0001) and ϵ s ( P =.09) above baseline values. Coronary occlusion caused a reduction in wall motion; after 45 seconds, all nonperfused segments were hypokinetic. There was a corresponding decrease in MDV and ϵ s , but this occurred earlier for ϵ s , and the difference between ischemic and nonischemic segments was greater for ϵ s than for MDV ( P s (compensatory hyperkinesis), whereas MDV trended downward, probably reflecting the global decrease in left ventricular function. Conclusion: Both MDV and ϵ s increase with dobutamine and decrease during ischemia. ϵ s appears to respond to local ischemia earlier than MDV, perhaps because it is a more local measure. Thus ϵ s may prove to be an accurate parameter for the clinical recognition of regional ischemia. (J Am Soc Echocardiogr 2000;13:731-7.)
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use of segmental tissue Doppler Velocity to quantitate exercise echocardiography
Journal of The American Society of Echocardiography, 1999Co-Authors: Agnes Pasquet, Guy Armstrong, Lisa Beachler, Michael S Lauer, Thomas H MarwickAbstract:Abstract Background: A quantitative technique is required to reduce the subjectivity and improve the reproducibility of stress echocardiography. Tissue Doppler imaging may offer these benefits, but its feasibility with exercise echocardiography (ExE) is undefined. This study sought the determinants of the exercise tissue Doppler Velocity (TDV) response and the feasibility and accuracy of color TDV during ExE. Methods and Results: Fifteen volunteers and 85 patients (age 60 ± 10 years, 19 women) with known or suspected coronary artery disease were studied with standard 2-dimensional (2D) echocardiography and pulsed wave (PW) and color TDV before and after they underwent exercise treadmill testing. After the study PW TDV was measured in 6 basal segments, and off-line software was used to display color TDV data from all myocardial segments. Color TDV was compared with PW TDV in the basal segments at rest and stress with the use of linear regression. Color TDV in mid and basal segments was compared with wall motion on 2D echocardiography. The predictors of the TDV response to exercise were defined in a multiple linear regression. A logistic regression model was used to integrate clinical, exercise, and TDV variables for prediction of abnormal regional left ventricular function. Color and PW correlated well at rest ( r = 0.81) and stress ( r = 0.84), but PW was greater than color velocities at rest and stress. On the basis of 2D echocardiography, 752 myocardial segments were classified as normal in patients without evidence of coronary disease, 309 were normal in patients with abnormal wall motion in another territory, and 128 showed ischemia or scar. Segmental comparison of velocities assessed by color TDV showed that scar segments had a lower Velocity than normal segments at rest and stress ( P Conclusion: Color TDV is feasible during ExE. The correlation found between TDV and wall motion analysis of experienced observers indicates that TDV may be useful as a quantitative tool for interpretation of ExE. (J Am Soc Echocardiogr 1999;12:901-12.)