Ventricular dyssynchrony markers in healthy black African subjects: A tissue doppler imaging study

Marie Bernadette N'cho-Mottoh, K. Yayehd, C. Iklo, J. Koffi, A. Ekou, R. N'Guetta, Jean Baptiste Anzouan Kacou
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Abstract

Background: Tissue Doppler is a promising method that allows the measurement of time of systolic and diastolic tissue velocities. Ventricular dyssynchrony was assessed in patients with heart failure. In sub-Saharan Africa, very few studies have focused on ventricular dyssynchrony in healthy subjects. Objectives: The purpose of this study was to measure time-to-peak of systolic and diastolic velocities of different segments of left ventricle and apply ventricular dyssynchrony markers to healthy black African subjects. Patients and Methods: Fifty healthy black African were enrolled consecutively over a period of 3 months. Time-to-peak systolic velocities (TS) and Time-to-peak early diastolic velocities (TE) were measured at the four basal segments of left ventricle. Five dyssynchrony markers were assessed: difference between maximal time-to-peak systolic velocity and minimal time-to-peak systolic velocity, time between septal time-to-peak systolic velocity and lateral time-to peak systolic velocity, standard deviation of time-to-peak systolic velocity of the four basal segments, difference between maximal time-to-peak early diastolic velocity and minimal time-to-peak early diastolic velocity, and standard deviation of time-to-peak early diastolic velocity of the four basal segments. Results: The frequency of some dyssynchrony markers was similar to that of other studies. The difference between maximal time-to-peak systolic velocity and minimal time-to-peak systolic velocity was correlated with age and was higher among women. The prevalence of diastolic dyssynchrony was higher in black African subjects. Conclusions: Large-scale studies on the healthy black African population could assess the relationship between diastolic dyssynchrony and changes in myocardial performance related to racial differences.
健康非洲黑人受试者的心室非同步运动标志物:组织多普勒成像研究
背景:组织多普勒是一种很有前途的方法,可以测量组织收缩和舒张速度的时间。在心力衰竭患者中评估心室非同步化运动。在撒哈拉以南非洲,很少有研究关注健康人的心室非同步化。目的:本研究的目的是测量左心室不同节段的收缩和舒张速度的峰值时间,并将心室非同步化标志物应用于健康的非洲黑人受试者。患者和方法:50名健康的非洲黑人连续入组3个月。测定左心室基底节段收缩期至峰值速度(TS)和早期舒张期至峰值速度(TE)。评估了五种非同步性指标:最大收缩期至峰值速度与最小收缩期至峰值速度之差、室间隔收缩期至峰值速度与侧侧收缩期至峰值速度之差、四个基底节段收缩期至峰值速度的标准差、最大舒张期至峰值速度与最小舒张期至峰值速度之差、四个基底节段舒张期至峰值速度的标准差。结果:部分非同步运动标志物出现频率与其他研究相似。最大收缩期至峰值速度和最小收缩期至峰值速度之间的差异与年龄相关,女性的差异更大。舒张不同步的患病率在非洲黑人受试者中较高。结论:对健康非洲黑人人群的大规模研究可以评估舒张非同步化与种族差异相关的心肌功能变化之间的关系。
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