In JoVE (1)
Other Publications (5)
- European Journal of Echocardiography : the Journal of the Working Group on Echocardiography of the European Society of Cardiology
- Cardiovascular Research
- The International Journal of Cardiovascular Imaging
- American Journal of Physiology. Heart and Circulatory Physiology
- European Heart Journal Cardiovascular Imaging
Articles by Vessilina Ferferieva in JoVE
Fetal Echocardiography and Pulsed-wave Doppler Ultrasound in a Rabbit Model of Intrauterine Growth Restriction Ryan Hodges1,2, Masayuki Endo1, Andre La Gerche3, Elisenda Eixarch4,5, Philip DeKoninck1, Vessilina Ferferieva3, Jan D'hooge3, Euan M. Wallace2, Jan Deprest1 1Division Woman and Child, Department Women, University Hospitals Leuven, 2The Ritchie Centre, Monash Institute of Medical Research, Department of Obstetrics and Gynaecology, Monash University, Victoria, Australia, 3Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, 4 We describe examination of fetal cardiac function with contemporary functional fetal echocardiography and fetoplacental Doppler ultrasound using the VisualSonics VEVO 2100 microultrasound in a surgically induced model of intrauterine fetal growth restriction in a rabbit.
Other articles by Vessilina Ferferieva on PubMed
Echocardiographic Assessment of Left Ventricular Untwist Rate: Comparison of Tissue Doppler and Speckle Tracking Methodologies European Journal of Echocardiography : the Journal of the Working Group on Echocardiography of the European Society of Cardiology. Jul, 2009 | Pubmed ID: 19359299 The study was designed to test the influence of the temporal resolution, at which tissue Doppler imaging (TDI) and speckle tracking imaging (STI) operate, on the accurate assessment of left ventricular (LV) untwist rate (UR).
Non-invasive Characterization of the Area-at-risk Using Magnetic Resonance Imaging in Chronic Ischaemia Cardiovascular Research. Jan, 2011 | Pubmed ID: 20685943 we investigated the performance of quantitative stress perfusion magnetic resonance imaging (MRI) as a basis for identifying and characterizing the area-at-risk subtending a chronic coronary artery (CA) stenosis.
Comparison of a New Methodology for the Assessment of 3D Myocardial Strain from Volumetric Ultrasound with 2D Speckle Tracking The International Journal of Cardiovascular Imaging. Jun, 2012 | Pubmed ID: 21847561 An alternative approach to extract 3D myocardial strain based on elastic registration of the ultrasound images (3DSE) was developed by our lab. The aim of the present study was to test its clinical performance by comparing strain values obtained by 3DSE with the ones obtained with 2D speckle tracking (2DST). Standard 2D B-mode and volumetric datasets were acquired in 12 patients with coronary heart disease (CHD) and in 12 control subjects. Longitudinal (Îµ(LL)), circumferential (Îµ(CC)) and radial (Îµ(RR)) strain values were obtained from 2D datasets using commercially available 2DST software and from volumetric datasets using the 3DSE approach. 3DSE provided lower strain values than 2DST. With both approaches global Îµ(LL) and Îµ(CC) were significantly lower in patients with CHD than in controls. Global Îµ(LL) and Îµ(CC) correlated well between both methods (R = 0.83, R = 0.86, respectively), while segmental correlations were moderate [R = 0.63 (Îµ(LL)), R = 0.41 (Îµ(CC))]. The highest differences in Îµ(LL) values obtained by the two methods and the highest number of erroneous Îµ(LL) with 3DSE were observed in the basal LV segments. This study shows that in real-life datasets our 3DSE method provides global and regional Îµ(LL) and Îµ(CC) values that are comparable with the ones obtained from 2DST, even though they are not interchangeable with each other. As only a single acquisition is required, 3D methods may offer advantages over the current 2D techniques. However, the accuracy of the 3DSE can still be improved by solving the problems that appear with deformation estimation in the basal segments.
The Relative Value of Strain and Strain Rate for Defining Intrinsic Myocardial Function American Journal of Physiology. Heart and Circulatory Physiology. Jan, 2012 | Pubmed ID: 22081696 It is well accepted that strain and strain rate deformation parameters are not only a measure of intrinsic myocardial contractility but are also influenced by changes in cardiac load and structure. To date, no information is available on the relative importance of these confounders. This study was designed to investigate how strain and strain rate, measured by Doppler echocardiography, relate to the individual factors that determine cardiac performance. Echocardiographic and conductance measurements were simultaneously performed in mice in which individual determinants of cardiac performance were mechanically and/or pharmacologically modulated. A multivariable analysis was performed with radial and circumferential strains and peak systolic radial and circumferential strain rates as dependent parameters and preload recruitable stroke work (PRSW), arterial elastance (E(a)), end-diastolic pressure, and left ventricular myocardial volume (LVMV) as independent factors representing myocardial contractility, afterload, preload, and myocardial volume, respectively. Radial strain was most influenced by E(a) (Î² = -0.58, R(2) = 0.34), whereas circumferential strain was strongly associated with E(a) and moderately with LVMV (Î² = 0.79 and -0.52, respectively, R(2) = 0.54). Radial strain rate was related to both PRSW and LVMV (Î² = 0.79 and -0.62, respectively, R(2) = 0.50), whereas circumferential strain rate showed a prominent correlation only with PRSW (Î² = -0.61, R(2) = 0.51). In conclusion, strain (both radial and circumferential) is not a good surrogate measure of intrinsic myocardial contractility unless the strong confounding influence of afterload is considered. Strain rate is a more robust measure of contractility that is less influenced by changes in cardiac load and structure. Thus, peak systolic strain rate is the more relevant parameter to assess myocardial contractile function noninvasively.
Assessment of Strain and Strain Rate by Two-dimensional Speckle Tracking in Mice: Comparison with Tissue Doppler Echocardiography and Conductance Catheter Measurements European Heart Journal Cardiovascular Imaging. Dec, 2012 | Pubmed ID: 23209279 AIMS: This study was designed in order to compare the strain and strain rate deformation parameters assessed by speckle tracking imaging (STI) with those of tissue Doppler imaging (TDI) and conductance catheter measurements in chronic murine models of left ventricular (LV) dysfunction. METHODS AND RESULTS: Twenty-four male C57BL/6J mice were assigned to wild-type (n = 8), myocardial infarction (n = 8) and transaortic constriction (n = 8) groups. Echocardiographic and conductance measurements were simultaneously performed at rest and during dobutamine infusion (5 Âµg/kg/min) in all animals 10 weeks post-surgery. The LV circumferential strain (Scirc) and the strain rate (SRcirc) were derived from grey scale and tissue Doppler data at frame rates of 224 and 375 Hz, respectively. Scirc and SRcirc by TDI/STI correlated well with the preload recruitable stroke work (PRSW) (r = -0.64 and -0.71 for TDI; r = -0.46 and -0.50 for STI, P < 0.05). Both modalities showed a good agreement with respect to Scirc and SRcirc (r = 0.60 and r = 0.63, P < 0.05). During stress, however, TDI-estimatedÂ Scirc and SRcirc values were predominantly higher than those measured by STI (P < 0.05). The similarity of Scirc and SRcirc measurements with respect to the STI/TDI data was examined by the Bland-Altman analysis. CONCLUSION: In mice, the STI- and TDI-derived strain and strain rate deformation parameters relate closely to intrinsic myocardial function. At low heart rate-to-frame rate ratios (HR/FR), both STI and TDI are equally acceptable for assessing the LV function non-invasively in these animals. At HR/FR (e.g. dobutamine challenge), however, these methods cannot be used interchangeably as STI underestimates S and SR at high values.