Temporal frequency requirements for tissue velocity imaging of the fetal heart

Elmstedt, Nina; Lind, Britta; Ferm-Widlund, K.; Westgren, Magnus; Brodin, Lärs-Åke

doi:10.1002/uog.8872

Cited by 9 publications

(7 citation statements)

References 24 publications

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“…Several studies have found the technique feasible with high reproducibility for both methods, provided a high frame rate is used 29 . We used a mean frame rate of 211 frames/s for adequate reconstruction of TDI data for the fetal heart 30 . We also demonstrated high reproducibility in all examined weeks.…”

Section: Discussionmentioning

confidence: 99%

Maternal obesity affects fetal myocardial function as early as in the first trimester

Ingul

Lorås

Tegnander

et al. 2016

Ultrasound in Obstet & Gyne

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Section: Discussionmentioning

confidence: 99%

Maternal obesity affects fetal myocardial function as early as in the first trimester

Ingul

Lorås

Tegnander

et al. 2016

Ultrasound in Obstet & Gyne

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“…All recordings were performed with the transducer perpendicular to the apex, providing a view of the fetal myocardium equivalent to an apical four-chamber view . The 2D and TVI sector widths were minimized to obtain a frame rate > 200 frames/s (median 209 frames/s, range 200 to 273), which is necessary for adequate reconstruction of TVI data for the fetal myocardium [8]. The recordings were performed by an experienced midwife and stored as cine loops of five to 10 consecutive cardiac cycles for offline analysis using EchoPAC (GE Vingmed, Norway) and GHLab (Gripping Heart AB, Sweden).…”

Section: Methodsmentioning

confidence: 99%

“…Color-coded tissue velocity imaging (TVI) offers quantitative measurements of regional myocardial function, and can potentially provide more sensitive and thus earlier indications of myocardial dysfunction. TVI enables adequate temporal resolution (>200 frames/s) [8] unlike speckle tracking (<80 frames/s) [9] and doesn’t overestimate true motion or alter offline gain settings in contrast to spectral Doppler [10]. Velocity can also be measured simultaneously in the different myocardial walls during the same cardiac cycle.…”

Section: Introductionmentioning

confidence: 99%

Reference values for fetal tissue velocity imaging and a new approach to evaluate fetal myocardial function

Elmstedt

Johnson

Lind

et al. 2013

Cardiovasc Ultrasound

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ObjectivesMyocardial function can be evaluated using color-coded tissue velocity imaging (TVI) to analyze the longitudinal myocardial velocity profile, and by expressing the motion of the atrioventricular plane during a cardiac cycle as coordinated events in the cardiac state diagram (CSD). The objective of this study was to establish gestational age specific reference values for fetal TVI measurements and to introduce the CSD as a potential aid in fetal myocardial evaluation.MethodsTVI recordings from 125 healthy fetuses, at 18 to 42 weeks of gestation, were performed with the transducer perpendicular to the apex to provide a four-chamber view. The myocardial velocity data was extracted from the basal segment of septum as well as the left and right ventricular free wall for subsequent offline analysis.ResultsDuring a cardiac cycle the longitudinal peak velocities of septum increased with gestational age, as did the peak velocities of the left and right ventricular free wall, except for the peak velocity of post ejection. The duration of rapid filling and atrial contraction increased during pregnancy while the duration of post ejection decreased. The duration of pre ejection and ventricular ejection did not change significantly with gestational age.ConclusionEvaluating fetal systolic and diastolic performance using TVI together with CSD could contribute to increase the knowledge and understanding of fetal myocardial function and dysfunction. The pre and post ejection phases are the variables most likely to indicate fetuses with abnormal myocardial function.

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“…This is important considering that the short duration of the movements of the myocardial walls require a high sampling rate for the acquisition of proper data [19] , an issue that becomes even more important when taking into consideration the high fetal heart rate. The frame rate using spectral TD, however, is lower, and this method also has the disadvantage of overestimating displacement values [18] .…”

Section: Introductionmentioning

confidence: 99%

Reproducibility and variability in the assessment of color-coded tissue velocity imaging of the fetal myocardium¬

Elmstedt

Lind

Ferm-Widlund

et al. 2013

JBGC

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Objective: The introduction of color-coded tissue velocity imaging (TVI) in fetal medicine is quite recent, and as this method is presently evaluated and developed in regard to diagnostic precision it is of outmost importance to evaluate the reproducibility for adequate clinical use. In this study, reproducibility and intra-and inter-observer variability was assessed for offline analysis as well as echocardiography investigations. Also, we evaluated the importance of exact placement of the region of interest (ROI).Methods: TVI recordings from 21 fetuses, at a gestational age of 27 to 41 weeks, were acquired at 208-239 frames/s for subsequent offline analysis. All recordings were performed with the transducer positioned to provide an apical four-chamber view and the myocardial velocity data was obtained from basal inferoseptum. The data set was analyzed according to Bland-Altman and reproducibility was expressed as the standard error of a single determination, estimated from duplicate determinations in percentage of the total. Results:The variation of reproducibility for the echocardiography investigation ranged from 2.0% to 9.8%. The duration of left ventricular ejection, and the peak velocities of early diastolic filling and atrial contraction being the most robust events measured. The variation of inter-observer variability for the echocardiography investigation ranged from 1.5% to 8.4%, and the variation of intra-and inter-observer variability for the offline analysis ranged from 1.2% to 10.4%. Least robust were the events of shortest duration, including isovolumetric contraction and relaxation. Conclusion:We believe that TVI measurements of the fetal myocardium could be performed in the clinical routine with acceptable reproducibility.

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Temporal frequency requirements for tissue velocity imaging of the fetal heart

Abstract: K E Y W O R D S:

Cited by 9 publications

References 24 publications

Maternal obesity affects fetal myocardial function as early as in the first trimester

Maternal obesity affects fetal myocardial function as early as in the first trimester

Reference values for fetal tissue velocity imaging and a new approach to evaluate fetal myocardial function

Reproducibility and variability in the assessment of color-coded tissue velocity imaging of the fetal myocardium¬

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