Labatt Family Heart Centre, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada.
J Am Soc Echocardiogr. 2010 Sep;23(9):929-37. doi: 10.1016/j.echo.2010.06.028. Epub 2010 Aug 5.
The investigators compared pulsed-wave tissue Doppler (PWTD) and color tissue Doppler (CTD) ventricular tissue velocities obtained using Vivid 7 (GE) and iE33 (Philips) ultrasound systems within a 30-minute time frame and examined interobserver and intraobserver variability.
Longitudinal PWTD and CTD images were prospectively acquired in 49 children from the base of the right and left ventricular free wall and septum and stored for offline analysis.
Intraobserver and interobserver coefficients of variation for PWTD velocities ranged from 4% to 6% and 5% to 10% for GE and from 1% to 10% and 2% to 14% for Philips, respectively. Intraobserver and interobserver coefficients of variation for CTD velocities ranged from 4% to 15% and 6% to 24% for GE and from 6% to 19% and 7% to 25% for Philips, respectively. Mean biases between the two systems for PWTD velocities, expressed as percentage differences, were around 0%, with the narrowest limits of agreement for systolic velocities at the septal annulus and the widest limits of agreement for early diastolic velocities at the lateral tricuspid valve annulus, respectively. Peak CTD-derived velocities were significantly and consistently lower for Philips compared with GE.
Agreement between GE-derived and Philips-derived PWTD velocities was reasonable, whereas CTD-derived velocities differed substantially.
研究人员在 30 分钟的时间内比较了 Vivid 7（GE）和 iE33（飞利浦）超声系统获得的脉冲波组织多普勒（PWTD）和彩色组织多普勒（CTD）心室组织速度，并检查了观察者间和观察者内的可变性。
前瞻性地从右心室游离壁和室间隔的底部获取 49 例儿童的纵向 PWTD 和 CTD 图像，并存储用于离线分析。
PWTD 速度的观察者内和观察者间变异系数范围分别为 GE 的 4%至 6%和 5%至 10%，以及飞利浦的 1%至 10%和 2%至 14%。CTD 速度的观察者内和观察者间变异系数范围分别为 GE 的 4%至 15%和 6%至 24%，以及飞利浦的 6%至 19%和 7%至 25%。两个系统之间 PWTD 速度的平均偏差表示为百分比差异，约为 0%，间隔瓣环的收缩期速度的协议界限最窄，外侧三尖瓣环的早期舒张期速度的协议界限最宽。与 GE 相比，飞利浦衍生的 CTD 衍生的峰值速度显著且一致较低。
GE 衍生的 PWTD 速度与飞利浦衍生的 PWTD 速度之间的一致性合理，而 CTD 衍生的速度差异很大。
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