Servicio de Cardiología, Hospital Universitario Virgen de la Victoria, Málaga, España.
Rev Esp Cardiol. 2010 Oct;63(10):1195-9. doi: 10.1016/s1885-5857(10)70234-6.
Segmental contractility can be assessed quantitatively by analyzing deformation, or strain, and the rate of deformation, or the strain rate. This type of analysis can be performed using either tissue Doppler imaging or, more recently, two-dimensional speckle-tracking echocardiography. The aim of this study was to determine typical parameter values in healthy subjects and their reproducibility. The study involved 105 healthy individuals, including 55 women (52.45%). Their mean age was 38.8 ± 9.5 years (range, 20-59 years). All underwent speckle-tracking echocardiography with velocity vector imaging. Mean values for the strain and strain rate for each segment as well as for the time-to-peak normalized by the length of the cycle (TPN) were obtained. The resulting mean values were: circumferential strain, 22.2 ± 4.81% with a TPN of 0.39 ± 0.06; longitudinal strain, 19.84 ± 4.59% with a TPN of 0.42 ± 0.06; circumferential strain rate, 1.64 ± 0.48 1/s with a TPN of 0.23 ± 0.06; and longitudinal strain rate, 1.3 ± 0.49 1/s with a TPN of 0.21 ± 0.09. Intra- and inter-observer variability were moderate in magnitude.
节段收缩性可通过分析变形（应变）及其变形率（应变速率）进行定量评估。这种分析可以使用组织多普勒成像或最近的二维斑点追踪超声心动图来进行。本研究旨在确定健康受试者的典型参数值及其可重复性。该研究纳入了 105 名健康个体，包括 55 名女性（52.45%）。他们的平均年龄为 38.8 ± 9.5 岁（范围 20-59 岁）。所有受试者均接受了斑点追踪超声心动图和速度向量成像检查。获得了每个节段的应变和应变速率以及通过周期长度归一化的峰值时间（TPN）的平均值。得出的平均值为：环向应变 22.2 ± 4.81%，TPN 为 0.39 ± 0.06；纵向应变 19.84 ± 4.59%，TPN 为 0.42 ± 0.06；环向应变速率 1.64 ± 0.48 1/s，TPN 为 0.23 ± 0.06；纵向应变速率 1.3 ± 0.49 1/s，TPN 为 0.21 ± 0.09。观察者内和观察者间的变异性中等。
