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Daewon Sohn - One of the best experts on this subject based on the ideXlab platform.

  • Mitral Annulus velocity in the evaluation of left ventricular diastolic function in atrial fibrillation
    Journal of The American Society of Echocardiography, 1999
    Co-Authors: Daewon Sohn, Inho Chai, Jongmin Song, Joohee Zo, Honggu Chun
    Abstract:

    Abstract This study assessed the clinical utility of Mitral Annulus velocity in the evaluation of left ventricular diastolic function in patients with atrial fibrillation. Atrial fibrillation is the most common sustained arrhythmia encountered in clinical practice. The clinical usefulness of conventional Doppler indexes is limited in atrial fibrillation because of the altered left atrial pressure and loss of synchronized atrial contraction. Mitral inflow and Mitral Annulus velocities were measured simultaneously with tau in 27 patients with nonrheumatic atrial fibrillation at the cardiac catheterization laboratory. Among deceleration time of Mitral inflow, peak Mitral inflow velocity (E), and peak diastolic Mitral Annulus velocity (E ), only E  correlated with tau ( r = 0.51, P = .007). Prolonged tau (≥50 ms) could be predicted by E  r = 0.79, P

  • assessment of Mitral Annulus velocity by doppler tissue imaging in the evaluation of left ventricular diastolic function
    Journal of the American College of Cardiology, 1997
    Co-Authors: Daewon Sohn, Inho Chai, Byunghee Oh, Youngbae Park, Yunshik Choi
    Abstract:

    Objectives. This study assessed the clinical utility of Mitral Annulus velocity in the evaluation of left ventricular diastolic function. Background. Mitral inflow velocity recorded by Doppler echocardiography has been widely used to evaluate left ventricular diastolic function but is affected by other factors. The Mitral Annulus velocity profile during diastole may provide additional information about left ventricular diastolic function. Methods. Mitral Annulus velocity during diastole was measured by Doppler tissue imaging (DTI) 1) in 59 normal volunteers (group 1); 2) in 20 patients with a relaxation abnormality as assessed by Doppler Mitral inflow variables (group 2) at baseline and after saline loading; 3) in 11 patients (group 3) with normal diastolic function before and after intravenous nitroglycerin infusion; and 4) in 38 consecutive patients (group 4) undergoing cardiac catheterization in whom Mitral inflow velocity and tau as well as Mitral Annulus velocity were measured simultaneously. Results. In group 1, mean ± SD peak early and late diastolic Mitral Annulus velocity was 10.0 ± 1.3 and 9.5 ± 1.5 cm/s, respectively. In group 2, Mitral inflow velocity profile changed toward the pseudonormalization pattern with saline loading (deceleration time 311 ± 84 ms before to 216 ± 40 ms after intervention, p < 0.001), whereas peak early diastolic Mitral Annulus velocity did not change significantly (5.3 ± 1.2 cm/s to 5.7 ± 1.4 cm/s, p = NS). In group 3, despite a significant change in Mitral inflow velocity profile after nitroglycerin, peak early diastolic Mitral Annulus velocity did not change significantly (9.5 ± 2.2 cm/s to 9.2 ± 1.7 cm/s, p = NS). In group 4, peak early diastolic Mitral Annulus velocity (r = −0.56, p < 0.01) and the early/late ratio (r = −0.46, p < 0.01) correlated with tau. When the combination of normal Mitral inflow variables with prolonged tau (≥50 ms) was classified as pseudonormalization, peak early diastolic Mitral Annulus velocity <8.5 cm/s and the early/late ratio <1 could identify the pseudonormalization with a sensitivity of 88% and specificity of 67%. Conclusions. Mitral Annulus velocity determined by DTI is a relatively preload-independent variable in evaluating diastolic function.

  • Assessment of Mitral Annulus Velocity by Doppler Tissue Imaging in the Evaluation of Left Ventricular Diastolic Function
    Journal of the American College of Cardiology, 1997
    Co-Authors: Daewon Sohn, Inho Chai, Byunghee Oh, Youngbae Park, Yunshik Choi
    Abstract:

    Objectives. This study assessed the clinical utility of Mitral Annulus velocity in the evaluation of left ventricular diastolic function. Background. Mitral inflow velocity recorded by Doppler echocardiography has been widely used to evaluate left ventricular diastolic function but is affected by other factors. The Mitral Annulus velocity profile during diastole may provide additional information about left ventricular diastolic function. Methods. Mitral Annulus velocity during diastole was measured by Doppler tissue imaging (DTI) 1) in 59 normal volunteers (group 1); 2) in 20 patients with a relaxation abnormality as assessed by Doppler Mitral inflow variables (group 2) at baseline and after saline loading; 3) in 11 patients (group 3) with normal diastolic function before and after intravenous nitroglycerin infusion; and 4) in 38 consecutive patients (group 4) undergoing cardiac catheterization in whom Mitral inflow velocity and tau as well as Mitral Annulus velocity were measured simultaneously. Results. In group 1, mean ± SD peak early and late diastolic Mitral Annulus velocity was 10.0 ± 1.3 and 9.5 ± 1.5 cm/s, respectively. In group 2, Mitral inflow velocity profile changed toward the pseudonormalization pattern with saline loading (deceleration time 311 ± 84 ms before to 216 ± 40 ms after intervention, p < 0.001), whereas peak early diastolic Mitral Annulus velocity did not change significantly (5.3 ± 1.2 cm/s to 5.7 ± 1.4 cm/s, p = NS). In group 3, despite a significant change in Mitral inflow velocity profile after nitroglycerin, peak early diastolic Mitral Annulus velocity did not change significantly (9.5 ± 2.2 cm/s to 9.2 ± 1.7 cm/s, p = NS). In group 4, peak early diastolic Mitral Annulus velocity (r = −0.56, p < 0.01) and the early/late ratio (r = −0.46, p < 0.01) correlated with tau. When the combination of normal Mitral inflow variables with prolonged tau (≥50 ms) was classified as pseudonormalization, peak early diastolic Mitral Annulus velocity

Yunshik Choi - One of the best experts on this subject based on the ideXlab platform.

  • assessment of Mitral Annulus velocity by doppler tissue imaging in the evaluation of left ventricular diastolic function
    Journal of the American College of Cardiology, 1997
    Co-Authors: Daewon Sohn, Inho Chai, Byunghee Oh, Youngbae Park, Yunshik Choi
    Abstract:

    Objectives. This study assessed the clinical utility of Mitral Annulus velocity in the evaluation of left ventricular diastolic function. Background. Mitral inflow velocity recorded by Doppler echocardiography has been widely used to evaluate left ventricular diastolic function but is affected by other factors. The Mitral Annulus velocity profile during diastole may provide additional information about left ventricular diastolic function. Methods. Mitral Annulus velocity during diastole was measured by Doppler tissue imaging (DTI) 1) in 59 normal volunteers (group 1); 2) in 20 patients with a relaxation abnormality as assessed by Doppler Mitral inflow variables (group 2) at baseline and after saline loading; 3) in 11 patients (group 3) with normal diastolic function before and after intravenous nitroglycerin infusion; and 4) in 38 consecutive patients (group 4) undergoing cardiac catheterization in whom Mitral inflow velocity and tau as well as Mitral Annulus velocity were measured simultaneously. Results. In group 1, mean ± SD peak early and late diastolic Mitral Annulus velocity was 10.0 ± 1.3 and 9.5 ± 1.5 cm/s, respectively. In group 2, Mitral inflow velocity profile changed toward the pseudonormalization pattern with saline loading (deceleration time 311 ± 84 ms before to 216 ± 40 ms after intervention, p < 0.001), whereas peak early diastolic Mitral Annulus velocity did not change significantly (5.3 ± 1.2 cm/s to 5.7 ± 1.4 cm/s, p = NS). In group 3, despite a significant change in Mitral inflow velocity profile after nitroglycerin, peak early diastolic Mitral Annulus velocity did not change significantly (9.5 ± 2.2 cm/s to 9.2 ± 1.7 cm/s, p = NS). In group 4, peak early diastolic Mitral Annulus velocity (r = −0.56, p < 0.01) and the early/late ratio (r = −0.46, p < 0.01) correlated with tau. When the combination of normal Mitral inflow variables with prolonged tau (≥50 ms) was classified as pseudonormalization, peak early diastolic Mitral Annulus velocity <8.5 cm/s and the early/late ratio <1 could identify the pseudonormalization with a sensitivity of 88% and specificity of 67%. Conclusions. Mitral Annulus velocity determined by DTI is a relatively preload-independent variable in evaluating diastolic function.

  • Assessment of Mitral Annulus Velocity by Doppler Tissue Imaging in the Evaluation of Left Ventricular Diastolic Function
    Journal of the American College of Cardiology, 1997
    Co-Authors: Daewon Sohn, Inho Chai, Byunghee Oh, Youngbae Park, Yunshik Choi
    Abstract:

    Objectives. This study assessed the clinical utility of Mitral Annulus velocity in the evaluation of left ventricular diastolic function. Background. Mitral inflow velocity recorded by Doppler echocardiography has been widely used to evaluate left ventricular diastolic function but is affected by other factors. The Mitral Annulus velocity profile during diastole may provide additional information about left ventricular diastolic function. Methods. Mitral Annulus velocity during diastole was measured by Doppler tissue imaging (DTI) 1) in 59 normal volunteers (group 1); 2) in 20 patients with a relaxation abnormality as assessed by Doppler Mitral inflow variables (group 2) at baseline and after saline loading; 3) in 11 patients (group 3) with normal diastolic function before and after intravenous nitroglycerin infusion; and 4) in 38 consecutive patients (group 4) undergoing cardiac catheterization in whom Mitral inflow velocity and tau as well as Mitral Annulus velocity were measured simultaneously. Results. In group 1, mean ± SD peak early and late diastolic Mitral Annulus velocity was 10.0 ± 1.3 and 9.5 ± 1.5 cm/s, respectively. In group 2, Mitral inflow velocity profile changed toward the pseudonormalization pattern with saline loading (deceleration time 311 ± 84 ms before to 216 ± 40 ms after intervention, p < 0.001), whereas peak early diastolic Mitral Annulus velocity did not change significantly (5.3 ± 1.2 cm/s to 5.7 ± 1.4 cm/s, p = NS). In group 3, despite a significant change in Mitral inflow velocity profile after nitroglycerin, peak early diastolic Mitral Annulus velocity did not change significantly (9.5 ± 2.2 cm/s to 9.2 ± 1.7 cm/s, p = NS). In group 4, peak early diastolic Mitral Annulus velocity (r = −0.56, p < 0.01) and the early/late ratio (r = −0.46, p < 0.01) correlated with tau. When the combination of normal Mitral inflow variables with prolonged tau (≥50 ms) was classified as pseudonormalization, peak early diastolic Mitral Annulus velocity

Luca Balzarini - One of the best experts on this subject based on the ideXlab platform.

Inho Chai - One of the best experts on this subject based on the ideXlab platform.

  • Mitral Annulus velocity in the evaluation of left ventricular diastolic function in atrial fibrillation
    Journal of The American Society of Echocardiography, 1999
    Co-Authors: Daewon Sohn, Inho Chai, Jongmin Song, Joohee Zo, Honggu Chun
    Abstract:

    Abstract This study assessed the clinical utility of Mitral Annulus velocity in the evaluation of left ventricular diastolic function in patients with atrial fibrillation. Atrial fibrillation is the most common sustained arrhythmia encountered in clinical practice. The clinical usefulness of conventional Doppler indexes is limited in atrial fibrillation because of the altered left atrial pressure and loss of synchronized atrial contraction. Mitral inflow and Mitral Annulus velocities were measured simultaneously with tau in 27 patients with nonrheumatic atrial fibrillation at the cardiac catheterization laboratory. Among deceleration time of Mitral inflow, peak Mitral inflow velocity (E), and peak diastolic Mitral Annulus velocity (E ), only E  correlated with tau ( r = 0.51, P = .007). Prolonged tau (≥50 ms) could be predicted by E  r = 0.79, P

  • assessment of Mitral Annulus velocity by doppler tissue imaging in the evaluation of left ventricular diastolic function
    Journal of the American College of Cardiology, 1997
    Co-Authors: Daewon Sohn, Inho Chai, Byunghee Oh, Youngbae Park, Yunshik Choi
    Abstract:

    Objectives. This study assessed the clinical utility of Mitral Annulus velocity in the evaluation of left ventricular diastolic function. Background. Mitral inflow velocity recorded by Doppler echocardiography has been widely used to evaluate left ventricular diastolic function but is affected by other factors. The Mitral Annulus velocity profile during diastole may provide additional information about left ventricular diastolic function. Methods. Mitral Annulus velocity during diastole was measured by Doppler tissue imaging (DTI) 1) in 59 normal volunteers (group 1); 2) in 20 patients with a relaxation abnormality as assessed by Doppler Mitral inflow variables (group 2) at baseline and after saline loading; 3) in 11 patients (group 3) with normal diastolic function before and after intravenous nitroglycerin infusion; and 4) in 38 consecutive patients (group 4) undergoing cardiac catheterization in whom Mitral inflow velocity and tau as well as Mitral Annulus velocity were measured simultaneously. Results. In group 1, mean ± SD peak early and late diastolic Mitral Annulus velocity was 10.0 ± 1.3 and 9.5 ± 1.5 cm/s, respectively. In group 2, Mitral inflow velocity profile changed toward the pseudonormalization pattern with saline loading (deceleration time 311 ± 84 ms before to 216 ± 40 ms after intervention, p < 0.001), whereas peak early diastolic Mitral Annulus velocity did not change significantly (5.3 ± 1.2 cm/s to 5.7 ± 1.4 cm/s, p = NS). In group 3, despite a significant change in Mitral inflow velocity profile after nitroglycerin, peak early diastolic Mitral Annulus velocity did not change significantly (9.5 ± 2.2 cm/s to 9.2 ± 1.7 cm/s, p = NS). In group 4, peak early diastolic Mitral Annulus velocity (r = −0.56, p < 0.01) and the early/late ratio (r = −0.46, p < 0.01) correlated with tau. When the combination of normal Mitral inflow variables with prolonged tau (≥50 ms) was classified as pseudonormalization, peak early diastolic Mitral Annulus velocity <8.5 cm/s and the early/late ratio <1 could identify the pseudonormalization with a sensitivity of 88% and specificity of 67%. Conclusions. Mitral Annulus velocity determined by DTI is a relatively preload-independent variable in evaluating diastolic function.

  • Assessment of Mitral Annulus Velocity by Doppler Tissue Imaging in the Evaluation of Left Ventricular Diastolic Function
    Journal of the American College of Cardiology, 1997
    Co-Authors: Daewon Sohn, Inho Chai, Byunghee Oh, Youngbae Park, Yunshik Choi
    Abstract:

    Objectives. This study assessed the clinical utility of Mitral Annulus velocity in the evaluation of left ventricular diastolic function. Background. Mitral inflow velocity recorded by Doppler echocardiography has been widely used to evaluate left ventricular diastolic function but is affected by other factors. The Mitral Annulus velocity profile during diastole may provide additional information about left ventricular diastolic function. Methods. Mitral Annulus velocity during diastole was measured by Doppler tissue imaging (DTI) 1) in 59 normal volunteers (group 1); 2) in 20 patients with a relaxation abnormality as assessed by Doppler Mitral inflow variables (group 2) at baseline and after saline loading; 3) in 11 patients (group 3) with normal diastolic function before and after intravenous nitroglycerin infusion; and 4) in 38 consecutive patients (group 4) undergoing cardiac catheterization in whom Mitral inflow velocity and tau as well as Mitral Annulus velocity were measured simultaneously. Results. In group 1, mean ± SD peak early and late diastolic Mitral Annulus velocity was 10.0 ± 1.3 and 9.5 ± 1.5 cm/s, respectively. In group 2, Mitral inflow velocity profile changed toward the pseudonormalization pattern with saline loading (deceleration time 311 ± 84 ms before to 216 ± 40 ms after intervention, p < 0.001), whereas peak early diastolic Mitral Annulus velocity did not change significantly (5.3 ± 1.2 cm/s to 5.7 ± 1.4 cm/s, p = NS). In group 3, despite a significant change in Mitral inflow velocity profile after nitroglycerin, peak early diastolic Mitral Annulus velocity did not change significantly (9.5 ± 2.2 cm/s to 9.2 ± 1.7 cm/s, p = NS). In group 4, peak early diastolic Mitral Annulus velocity (r = −0.56, p < 0.01) and the early/late ratio (r = −0.46, p < 0.01) correlated with tau. When the combination of normal Mitral inflow variables with prolonged tau (≥50 ms) was classified as pseudonormalization, peak early diastolic Mitral Annulus velocity

M Kazutaka D Aonuma - One of the best experts on this subject based on the ideXlab platform.

  • idiopathic left ventricular tachycardia originating from the Mitral Annulus
    Journal of Cardiovascular Electrophysiology, 2005
    Co-Authors: M Koji D Kumagai, M Yasuteru D Yamauchi, M Atsushi D Takahashi, M Yasuhiro D Yokoyama, M Yukio D Sekiguchi, M Jun D Watanabe, M Yoshito D Iesaka, M Kunio D Shirato, M Kazutaka D Aonuma
    Abstract:

    Background: Radiofrequency catheter ablation (RFCA) can eliminate most idiopathic repetitive monomorphic ventricular tachycardias (RMVTs) originating from the right and left ventricular outflow tracts (RVOT, LVOT). Here, we describe the electrophysiological (EP) findings of a new variant of RMVT originating from the Mitral Annulus (MAVT). Methods and Results: MAVT was identified in 35 patients out of 72 consecutive left ventricular RMVTs from May 2000 to June 2004. All patients underwent an EP study and RFCA. The sites of origin of the MAVT were grouped into four groups according to the successful ablation sites around the Mitral Annulus. Group I included the anterior sites (n = 11), group II the anterolateral sites (n = 9), group III the lateral sites (n = 6), and group IV the posterior sites (n = 9). The MAVTs were a wide QRS tachycardia with a delta wave-like beginning of the QRS complex. The transitional zone of the R wave occurred between V1-V2 in all cases. The 12-lead electrocardiogram (ECG) pattern might reflect the site of the origin of MAVTs around the Mitral Annulus. We proposed an algorithm for predicting the site of the focus and the tactics needed for successful RFCA of the MAVT. Conclusions: We described the EP findings of the new variant of RMVT, MAVT. Most MAVTs could be eliminated by RF applications to the endocardial Mitral Annulus using our proposed tactics.