The Experts below are selected from a list of 183 Experts worldwide ranked by ideXlab platform
Jeroen J Bax - One of the best experts on this subject based on the ideXlab platform.
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high teMporal velocity encoded Mri for the assessMent of left ventricular inflow propagation velocity coMparison with color M Mode Echocardiography
Journal of Magnetic Resonance Imaging, 2015Co-Authors: Emmeline E Calkoen, Nina Ajmone Marsan, Jeroen J Bax, Pieter J Van Den Boogaard, Arno A W Roest, Albert De Roos, Jos J M WestenbergAbstract:Purpose To develop an alternative Method for Vp-assessMent using high-teMporal velocity-encoded Magnetic resonance iMaging (VE-MRI). Left ventricular (LV) inflow propagation velocity (Vp) is considered a useful paraMeter in the coMplex assessMent of LV diastolic function and is Measured by Color M-Mode Echocardiography. Materials and Methods A total of 43 patients diagnosed with ischeMic heart failure (61 ± 11 years) and 22 healthy volunteers (29 ± 13 years) underwent Color M-Mode Echocardiography and VE-MRI to assess the inflow velocity through the Mitral valve (Mean interexaMination tiMe 14 days). TeMporal resolution of VE-MRI was 10.8–11.8 Msec. Local LV inflow velocity was saMpled along a 4-cM line starting froM the tip of the Mitral leaflets and for consecutive saMple points the point-in-tiMe was assessed when local velocity exceeded 30 cM/s. FroM the position–tiMe relation, Vp was calculated by both the difference quotient (Vp-MRI-DQ) as well as froM linear regression (Vp-MRI-LR). Results Good correlation was found between Vp-echo and both Vp-MRI-DQ (r = 0.83, P < 0.001) and Vp-MRI-LR (r = 0.84, P < 0.001). Vp-MRI showed a significant but sMall underestiMation as coMpared to Vp Measured by Echocardiography (Vp-MRI-DQ: 5.5 ± 16.2 cM/s, P = 0.008; Vp-MRI-LR: 9.9 ± 15.2 cM/s, P < 0.001). Applying age-related cutoff values for Vp to identify LV iMpaired relaxation, kappa-agreeMent with Echocardiography was 0.72 (P < 0.001) for Vp-MRI-DQ and 0.69 (P < 0.001) for Vp-MRI-LR. Conclusion High teMporal VE-MRI represents a novel approach to assess Vp, showing good correlation with Color M-Mode Echocardiography. In healthy subjects and patients with ischeMic heart failure, this new Method deMonstrated good agreeMent with Echocardiography to identify LV iMpaired relaxation. J. Magn. Reson. IMaging 2015.
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relative Merits of M Mode Echocardiography and tissue doppler iMaging for prediction of response to cardiac resynchronization therapy in patients with heart failure secondary to ischeMic or idiopathic dilated cardioMyopathy
American Journal of Cardiology, 2007Co-Authors: Gabe B Bleeker, Martin J Schalij, Eric Boersma, Eduard R Holman, Paul Steendijk, Ernst E Van Der Wall, Jeroen J BaxAbstract:M-Mode Echocardiography (using the septal-to-posterior wall Motion delay [SPWMD]) and color-coded tissue Doppler iMaging (TDI; using the septal-to-lateral delay in peak systolic velocity) have been proposed for assessMent of left ventricular (LV) dyssynchrony and prediction of response to cardiac resynchronization therapy (CRT). In this study, a head-to-head coMparison between M-Mode Echocardiography and color-coded TDI was perforMed for assessMent of LV dyssynchrony and prediction of response to CRT. Consecutive (n = 98) patients with severe heart failure (New York Heart Association class III/IV), LV ejection fraction ≤35%, and QRS duration >120 Ms underwent CRT. Before paceMaker iMplantation, LV dyssynchrony was assessed by M-Mode Echocardiography (SPWMD) and color-coded TDI (septal-to-lateral delay). At baseline and 6 Months after iMplantation, clinical and echocardiographic paraMeters were evaluated. SPWMD MeasureMent was not feasible in 41% of patients due to akinesia of the septal and/or posterior walls or poor acoustic windows. Conversely, the septal-to-lateral delay could be assessed in 96% of patients. At 6-Month follow-up, 75 patients (77%) were classified as responders to CRT (iMproveMent ≥1 New York Heart Association class). The sensitivity and specificity of SPWMD were lower coMpared with those of septal-to-lateral delay (66% vs 90%, p
Wang Chun - One of the best experts on this subject based on the ideXlab platform.
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The regional Myocardial Motion evaluated by oMni-directional M-Mode Echocardiography in hypertensive patients with left ventricular hypertrophy
Chinese Journal of Hypertension, 2011Co-Authors: Wang ChunAbstract:Objective To assess the regional Myocardial Motion in patients with hypertension using the oMni-directional M-Mode Echocardiography. Methods Thirty-two norMal subjects and 32 essential hypertensives with left ventricular hypertrophy(LVH) were selected. The paraMeters were Measured respectively on three levels (Mitral valve level, papillary Muscle level, apical level) at the left ventricular short-axis view by LEJ-2 oMni-directional M-Mode Echocardiography, including endocardial velocity, epicardial velocity, velocity difference between endocardiuM and epicardiuM and wall thickness. Myocardialvelocitygradient (MVG) was estiMated as (VenResults MVG on hypertrophic segMents of interventricular septuM in patients with LVH were significantly lowered than those in norMal subjests(P0.05), and MVG of non-hypertrophic inferior wall were also significantly lowered than those in norMal subjests(P0.05), correlation analysis showed that MVG related well with SR. Conclusions OMni-directional M-Mode Echocardiography can be used to assess quantificationally the regional Myocardial Motion and function, and the abnorMal of regional Myocardial Motion was showed early in patients with LVH while the left ventricular overall systolic and diastolic function were norMal.
Manel Azqueta - One of the best experts on this subject based on the ideXlab platform.
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usefulness of ventricular dyssynchrony Measured using M Mode Echocardiography to predict response to resynchronization therapy
American Journal of Cardiology, 2007Co-Authors: Ernesto Diazinfante, Marta Sitges, Barbara Vidal, L Mont, Victoria Delgado, Alba Marigliano, Alfonso Macias, Jose Maria Tolosana, David Tamborero, Manel AzquetaAbstract:There are discordant data about the utility of septal-to-posterior wall Motion delay (SPWMD) assessed using M-Mode Echocardiography to predict an iMproveMent with cardiac resynchronization therapy (CRT). Baseline SPWMD was Measured using M-Mode in a parasternal short-axis view in a series of 67 patients undergoing CRT and followed up after 6 Months. Heart failure was caused by coronary artery disease in 27 patients. Clinical responders were patients who were alive, had not undergone heart transplantation, and also increased the distance walked in 6 Minutes by >10%. Baseline SPWMDs were Mean 155 +/- 113 Ms and Median 135. Thirty-four patients (51%) had an SPWMD >130 Ms. At 6-Month follow-up, there were 17 nonresponders. At baseline, there were no significant differences between patients with SPWMD >130 or 130 Ms was also not a predictor. In conclusion, SPWMD is not a good predictor of response to CRT.
Gilles Chatellier - One of the best experts on this subject based on the ideXlab platform.
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Accuracy and reproducibility of left ventricular Mass MeasureMent by subcostal M-Mode Echocardiography in hypertensive patients and professional bicyclists
The American journal of cardiology, 1993Co-Authors: Eric Abergel, Ariel Cohen, Laurent Vaur, Fadia Khellaf, Joël Ménard, Gilles ChatellierAbstract:Abstract In soMe patients, left ventricular (LV) Mass cannot be evaluated by M-Mode Echocardiography because the parasteMal long-axis view is not available. The aiM of this study was to deterMine whether the subcostal view obtained by M-Mode Echocardiography under 2-diMensional guidance allows accurate and reproducible LV Mass deterMination. Using the cube forMula, LV Mass was calculated, froM parasternal and subcostal views in 96 subjects: 73 hypertensives and 23 professional bicyclists, covering a wide range of LV diMensions. M-Mode tracings were read by 2 experienced echocardiographers and the interobserver variability was evaluated. With use of the subcostal view, the interobserver reproducibility, expressed as observer 1-observer 2, was excellent: −0.3 ± 1.3 MM for LV diastolic diaMeter, −0.1 ± 1.0 MM for ventricular diastolic septal thickness, 0.2 ± 0.6 MM for diastolic free wall thickness and 0.03 ± 16.7 g for LV Mass. In 96% of cases, the difference in LV Mass between the 2 observers did not exceed 30 g. With use of the parasternal and subcostal approaches, LV Mass was not statistically different (202.6 ± 2.2 g and 206.5 ± 2.0 g, respectively) and the difference was
F Proulx - One of the best experts on this subject based on the ideXlab platform.
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ventriculo atrial tiMe interval Measured on M Mode Echocardiography a deterMining eleMent in diagnosis treatMent and prognosis of fetal supraventricular tachycardia
Heart, 1998Co-Authors: E Jaeggi, Jeanclaude Fouron, Anne Fournier, N Van Doesburg, Susan Pamela Drblik, F ProulxAbstract:Objective—To deterMine whether M Mode Echocardiography can differentiate fetal supraventricular tachycardia according to the ventriculo-atrial (VA) tiMe interval, and if the resulting division into short and long VA intervals holds any relation with clinical presentation, ManageMent, and fetal outcoMe. Design—Retrospective case series. Subjects—23 fetuses with supraventricular tachycardia. Main outcoMe Measures—A systeMatic review of the M Mode echocardiograMs (for VA and atrioventricular (AV) interval MeasureMents), clinical profile, and final outcoMe. Results—19 fetuses (82.6%) had supraventricular tachycardia of the short VA type (Mean (SD) VA/AV ratio 0.34 (0.16); heart rate 231 (29) beats/Min). Tachycardia was sustained in six and interMittent in 13. Hydrops was present in three (15.7%). Digoxin, the first drug given in 14, failed to control tachycardia in five. Three of these then received sotalol and converted to sinus rhythM. All fetuses of this group survived. Postnatally, supraventricular tachycardia recurred in three, two having Wolff-Parkinson-White syndroMe. Four fetuses (17.4%) had long VA tachycardia (VA/AV ratio 3.89 (0.82); heart rate 226 (10) beats/Min). Initial treatMent with digoxin was ineffective in all, but sotalol was effective in two. Heart failure caused fetal death in one and preMature delivery in one. All three surviving fetuses had recurrences of supraventricular tachycardia after birth: two had the perManent forM of junctional reciprocating tachycardia and one had atrial ectopic tachycardia. Conclusions—Careful MeasureMent of ventriculo-atrial intervals on fetal M Mode Echocardiography can be used to distinguish short froM long VA supraventricular tachycardia and May be helpful in optiMising ManageMent. Digoxin, when indicated, May reMain the drug of choice in the short VA type but appears ineffective in the long VA type. Keywords: fetus; supraventricular tachycardia; ventriculo-atrial interval; digoxin
