AIMS Echocardiographic techniques have so far provided suboptimal estimates of myocardial contractility in humans. Longitudinal myocardial motion during the isovolumic contraction (IVC) phase, measured by colour tissue Doppler imaging (TDI), has recently been shown in experimental animal models to reflect the state of myocardial contractility. The aim of the present study was to investigate
May 01, 2014 · Intraobserver variability values were 5.3% ± 3.3% for displacement, 5.3% ± 3.9% for systolic velocity, 5.5% ± 3.7% for diastolic velocity, 5.9% ± 4.1% for acceleration during isovolumic contraction, 5.7% ± 3.6% for diastolic acceleration, and 9.6% ± 6.3% for percent wall thickening. Assessment of right ventricular function by isovolumic Abstract:Objective:The main purpose of present study was to investigate the impact of percutaneous closure of atrial septal defect (ASD) on right ventricular (RV) systolic function assessed by tricuspid annular isovolumic myocardial acceleration (IVA) that is independent of preload and afterload changes.Methods:A prospective cohort study was designed involving twenty five patients with
Assessment of right ventricular function by isovolumic contraction acceleration before and after percutaneous closure of atrial septal defects:A preliminary study Introduction Atrial septal defect (ASD) is the most commonly encoun-tered congenital heart disease in adults and constitutes 10% of all congenital heart diseases (1). Early recovery of tricuspid annular isovolumic Isovolumic acceleration, a load-independent measure of The assessment of right ventricular (RV) function during the largest strain value during systole and was averaged over ve heartbeats (Fig. 1C). Pulmonary ow velocity acceleration time (AT)the
Background:According to recent USA guidelines, right ventricular (RV) dysfunction can be diagnosed on the basis of a single parameter, such as tricuspid lateral annular systolic velocity (S')<10 cm/s or RV fractional area change (RVFAC)<35%. Aims:To assess these recommendations in a large unselected cohort of patients awaiting cardiac surgery and evaluate less validated RV function criteria. Effect of age on left ventricular systolic function in Jul 13, 2005 · When the group was stratified by gender, isovolumic velocity and acceleration were higher in men than women, but the differences were not significant (P= 0.12 and 0.37, respectively). No significant relation was observed between age and measurements of LV systolic function by regression analysis in women ( P > 0.1).
PEDIATRICS ISRN Pediatrics 2090-4703 International Scholarly Research Network 753481 10.5402/2012/753481 753481 Review Article Transthoracic Echocardiography in Children and Young Adults with Congenital Heart Disease Koestenberger Martin Brogan T. V. Law Y. M. Division of Pediatric Cardiology Department of Pediatrics Medical University of Graz Auenbruggerplatz 30, 8036 Graz Journal of Clinical & Experimental CardiologyThe mean values of these segments are used to trace a mean longitudinal strain curve (white dotted line). The value at end-systole is then measured. f) Color tissue Doppler echocardiogram at the lateral tricuspid valve annulus and measurement of isovolumic acceleration (iVA). Aortic valve opening and closure are depicted by green
Nov 01, 2001 · The rate of recoil of torsion, determined wholly noninvasively, provides an isovolumic phase, preload-independent assessment of LV relaxation. Use of this novel parameter should allow the detailed study of diastolic function in states known to affect filling rates, such as aging, hypertension, and congestive heart failure. Myocardial Acceleration During Isovolumic Contraction Mar 07, 2005 · Background Acceleration of the mitral ring during isovolumic contraction has been proposed as a load-independent index of global left ventricular (LV) contractility. This study investigates whether myocardial isovolumic acceleration (IVA) reflects regional contractility. Methods and Results In acutely instrumented, anesthetized dogs, we measured LV pressure, myocardial long-axis
Mar 01, 2015 · Background Quantitative assessment of right ventricular (RV) function is important for the management of patients with congenital heart disease. Tissue Doppler (TDI)derived myocardial acceleration during isovolumic contraction (IVA) is an echocardiographic measure of contractility that is independent of loading conditions. ORIGINAL - J-STAGEIVA indicates acceleration of the wave at the beginning of the isovolumic ventricular contraction phase. IVA index was calculated by dividing peak velocity during the isovolumic con-traction phase by the time to reach peak velocity from the start of isovolumic contraction (5). The normal value of IVA in children is reported to be 2-3 cm/m 2 (6).
The mean difference between isovolumic and auxotonic dP/dtmmax is 40 mm Hg/sec (15 to 80 mm Hg/sec)-i.e. about 10% of the value measured auxotonically. springer There was a marked and significant reduction of isovolumic contractility indices indicating a depression of myocardial contractility in situ by 2027 per cent.Assessment of right ventricular function by isovolumic Assessment of right ventricular function by isovolumic contraction acceleration before and after percutaneous closure of atrial septal defects:a preliminary study. Akyüz AR(1), Korkmaz L, Turan T, Kr A, Erkan H, Aaç MT, Erku ME, Celik S, Akdemir R.