Two-dimensional Transesophageal Echocardiographic Characterization of Ventricular Filling in Real Time by Acoustic Quantification: Comparison with Pulsed Doppler Echocardiography

Stoddard, Marcus F.; Keedy, David L.; Longaker, Rita A.

doi:10.1016/s0894-7317(14)80117-x

Cited by 29 publications

(9 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reference values for RV apical four-chamber area-indexes in 50 healthy adults were similar to our results [10]. For assessment of LV function in adults, the Acoustic Quantification system has been validated against conventional twodimensional and Doppler echocardiography, MRI, and radionuclide studies; and acceptable interobserver reproducibility has been reported [4,8,10,13,18,21,24,25,27]. Correlation between Acoustic Quantification and manually traced areas has been adequate, particularly in the LV short-axis view [13,27].…”

Section: Echocardiographic Automated Border Detectionsupporting

confidence: 83%

“…The main reasons are inaccuracies in the position of the region of interest and the dependence on gain settings of this system. Excessive gain may result in cavity clutter and underestimation, low gain to endocardial dropout, and overestimation of Acoustic Quantification areas [13,25,27]. As the comparison of corrected Acoustic Quantification and conventional echocardiography results in our study show, these potential problems introduce additional variation but do not result in important systematic errors.…”

Section: Echocardiographic Automated Border Detectionmentioning

confidence: 65%

“…This system uses an automated border detection algorithm based on integrated backscatter imaging [21]. For best performance, important changes in gain settings optimal for conventional two-dimensional echocardiography are required [21,25]. Reports on this system have validated its rapid assessment of left ventricular (LV) function [1-4, 8, 10, 18, 21, 24, 25, 27].…”

mentioning

confidence: 99%

See 2 more Smart Citations

On-Line Automated Border Detection for Echocardiographic Quantification of Right Ventricular Size and Function in Children

et al. 1997

View full text Add to dashboard Cite

Rapid, accurate assessment of right ventricular (RV) size is important for the management of children with congenital heart disease. The usefulness of the Acoustic Quantification system of automated border detection (ABD) and on-line quantification (AQ) for assessment of RV size was tested in 36 children. AQ data were compared to "corrected AQ" measurements (after correction for cavity areas erroneously included in the region of interest) required for AQ. Furthermore, the influence of necessary changes to gain settings was tested in "lateral gain control" (LGC) images obtained by removal of ABD overlays. All results were compared to conventional echocardiography (echo), and agreement with magnetic resonance imaging (MRI) RV areas was assessed. Systematic differences (+/-) limits of agreement with MRI (transverse plane) for conventional echo and AQ (apical four-chamber view) were as follows: end-diastolic -0.8 +/- 3.8 (conventional echo) versus -1.7 +/- 4.6 (AQ) cm2/m2 (p < 0.001); end-systolic -1.3 +/- 3.2 versus -4.9 +/- 5.8 (AQ) cm2/m2 (p < 0.001); fractional area change 7.8 +/- 17.0% versus 26.9 +/- 31.4% (AQ) (p < 0.001). Differences between conventional echo, LGC, and corrected AQ areas were not statistically significant. The best agreement between MRI and echocardiography was with conventional echo. We conclude that automated border detection of the RV can be performed successfully with the AQ system at a fixed point in the cardiac cycle. For adequate assessment of RV function manual corrections of online AQ results are still required, which results in an important reduction of the time gain of on-line quantification.

show abstract

Section: Echocardiographic Automated Border Detectionsupporting

confidence: 83%

Section: Echocardiographic Automated Border Detectionmentioning

confidence: 65%

mentioning

confidence: 99%

See 1 more Smart Citation

On-Line Automated Border Detection for Echocardiographic Quantification of Right Ventricular Size and Function in Children

et al. 1997

View full text Add to dashboard Cite

show abstract

“…At least with transesophageal echocardiography a closer correlation to acoustic quantification may exist, if Doppler parameters are recorded at the annulus level as compared to the tips of the mitral valve. 17 As Doppler echocardiography and acoustic quantification test different aspects of diastolic behavior, their combined use may be complementary and improve the noninvasive identification of diastolic dysfunction. Our findings let us hypothesize that acoustic quantification might even be superior to Doppler echocardiography for detection of early or mild diastolic dysfunction.…”

Section: Discussionmentioning

confidence: 99%

Assessment of left ventricular diastolic filling in arterial hypertension Comparison of pulsed doppler echocardiography and acoustic quantification

Muscholl

Kurzidim

Pfeifer

et al. 1998

American Journal of Hypertension

View full text Add to dashboard Cite

We compared acoustic quantification (AQ) to Doppler echocardiography (DE) in the evaluation of left ventricular (LV) diastolic filling in 41hypertensives and 42 controls. In hypertensives, DE showed reduced ratios of early to late diastolic velocity, AQ revealed reduced peak to late filling rate ratios, and both techniques found prolonged acceleration times indicating abnormal filling. In 22 patients with mild hypertension and less LV hypertrophy, however, all DE filling parameters were normal. In these patients AQ indicated A nalysis of mitral inflow velocities as determined by pulsed Doppler echocardiography has been used for noninvasive assessment of left ventricular (LV) diastolic function.1-3 Doppler echocardiographic parameters of diastolic filling are functions of temporal pressure differences between left atrium and left ventricle. 4 They are determined not only by myocardial relaxation and compliance, but also by pericardial properties, ventricular interaction, age, heart rate, preload, and afterload. 5,6 Therefore, the Doppler mitral inflow profile is often inconclusive in the assessment of LV diastolic function. A commercially available acoustic quantification system of ultrasonic integrated backscatter has been introduced that provides on-line delineation of borders between blood and endocardium in two-dimensional imaging. 7,8 This novel technique allows on line tracking of the changing LV area over time. Also, a curve of the rate of area change (dA/dt) over time can be displayed. In sinus rhythm this curve shows an early and late diastolic peak corresponding to peak and late diastolic filling rate, which has been reported to permit characterization of LV diastolic filling. 9,10 However, the role of acoustic quantification in the diagnosis of diastolic dysfunction is still unclear. Therefore, we investigated whether acoustic quantification is useful in the investigation of diastolic filling in arterial hypertension and offers additional information in patients with inconclusive Doppler filling profiles.

show abstract

“…The inter-beat variability caused by these determinants represents a limitation to the ability of the AQ technique to evaluate ventricular function, in particular LV filling characteristics (STODDARD et at., 1994;GOTTLIEB et at., 1995;VITARELLI et al, 1996), when only few beats are considered. To overcome this limitation, methods based on signal averaging of AQ waveforms (SAAQ) by template matching have been proposed and utilised to improve the reliability of clinical measurements (MoR-AvI et al, 1995;.…”

Section: Introductionmentioning

confidence: 99%

Analysis of cardiac left-ventricular volume based on time warping averaging

et al. 2002

View full text Add to dashboard Cite

The cardiac left-ventricular (LV) volume signal, obtained by acoustic quantification, is affected by noise and respiratory modulation, resulting in a large beat-to-beat variability that affects the computation of LV function indices. A new method is proposed to improve the evaluation of LV indices by applying a signal averaging technique based on dynamic time warping to consecutive LV volume waveforms. Volume signals obtained from ten normal young (NY) subjects (mean age +/- SD: 25+/-5 years) were used to evaluate the performance of this algorithm. To evaluate its clinical utility, the effects of ageing and pharmacologically induced changes on LV function were assessed by studying, respectively, ten normal (N) adult subjects (age 64+/-8 years) and ten patients with dilated cardiomyopathy during a control and low-dose dobutamine (10 microg kg(-1) min(-1)) study. Indices of LV function were highly consistent, with a variability of less than 8%, even when only 16 beats were averaged, independently of their selection inside the whole recording. When compared with beat-to-beat measures, the averaging of 16 beats significantly reduced (by more than 50%) the interbeat variability of all indexes. Expected alterations in both diastolic and systolic function were evidenced both with ageing (peak filling atrial contraction and ejection rates: from 275+/-77 mls(-1), 76+/-30 ml s(-1) 230+/-70 mls(-1), respectively, in NY, to 160+/-33 mls(-1), 125+/-39 mls(-1), 163+/-54 mls(-1) in N) and with dobutamine (peak filling and ejection rates from 160+/-72 mls(-1) and 183+/-86 mls(-1) respectively, in control, to 253+/-75 mls(-1) and 251+/-105 mls(-1) with dobutamine). Signal averaging with time warping allows fast and improved assessment of LV function.

show abstract

Two-dimensional Transesophageal Echocardiographic Characterization of Ventricular Filling in Real Time by Acoustic Quantification: Comparison with Pulsed Doppler Echocardiography

Cited by 29 publications

References 20 publications

On-Line Automated Border Detection for Echocardiographic Quantification of Right Ventricular Size and Function in Children

On-Line Automated Border Detection for Echocardiographic Quantification of Right Ventricular Size and Function in Children

Assessment of left ventricular diastolic filling in arterial hypertension Comparison of pulsed doppler echocardiography and acoustic quantification

Analysis of cardiac left-ventricular volume based on time warping averaging

Contact Info

Product

Resources

About