通过多普勒组织追踪和应变率评估正常受试者左心室的纵向收缩。
Evaluation of the longitudinal contraction of the left ventricle in normal subjects by Doppler tissue tracking and strain rate.
作者信息
Andersen Niels Holmark, Poulsen Steen Hvitfeldt
机构信息
Department of Internal Medicine, Diabetes and Endocrinology, Aarhus University Hospital, Denmark.
出版信息
J Am Soc Echocardiogr. 2003 Jul;16(7):716-23. doi: 10.1016/S0894-7317(03)00325-0.
BACKGROUND
Tissue tracking (TT) and strain rate (SR) are new echocardiographic modalities on the basis of Doppler tissue imaging, which allow assessment of the systolic longitudinal contraction of the myocardium.
OBJECTIVE
The aim of this study was to describe the global and regional longitudinal function of the left ventricle by TT and SR analysis.
METHODS
The study population consisted of 55 normal subjects. To assess longitudinal myocardial contraction, TT was performed in the standard apical views and expressed as a score index of the 16 myocardial segments. In addition, SR was performed in each segment.
RESULTS
The mean longitudinal contraction was 7.8 +/- 1.8 mm. Longitudinal contraction was significantly decreasing with increasing age and systolic blood pressure (r = -0.46, P <.01 for both measures), but independent of heart rate, left ventricular diameters, ejection fraction, and fractional shortening. SR was found significantly larger in the basal segments than in the middle and apical segments (-1.8 +/- 0.6 s(-1) vs 1.4 +/- 0.3 s(-1) P <.001).
CONCLUSION
TT and SR analysis are easily obtained and may complement conventional measures of left ventricular systolic function.
背景
组织追踪（TT）和应变率（SR）是基于多普勒组织成像的新型超声心动图技术，可用于评估心肌的收缩期纵向收缩功能。
目的
本研究旨在通过TT和SR分析描述左心室的整体和局部纵向功能。
方法
研究对象为55名正常受试者。为评估心肌纵向收缩功能，在标准心尖视图下进行TT检查，并将其表示为16个心肌节段的评分指数。此外，对每个节段进行SR检查。
结果
平均纵向收缩为7.8±1.8mm。纵向收缩随年龄和收缩压升高而显著降低（两种测量方法的r=-0.46，P均<0.01），但与心率、左心室直径、射血分数和缩短分数无关。发现基底节段的SR明显大于中间和心尖节段（-1.8±0.6s⁻¹对1.4±0.3s⁻¹，P<0.001）。
结论
TT和SR分析易于获得，可补充左心室收缩功能的传统测量方法。
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