Instantaneous assessment of left ventricular midwall mechanics with tissue Doppler tracking technique
Instantaneous assessment of left ventricular midwall mechanics with tissue Doppler tracking technique
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DOI：
10.1054/s1071-9164(03)00126-x
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发表时间：
2003-10-01
影响因子：
6
通讯作者：
Masuyama, T
中科院分区：
文献类型：
--
作者：
Yamamoto, K;Nishikawa, N;Masuyama, T
背景资料：左室肥厚患者的左室收缩功能以室壁中膜力学指标较以室壁内膜力学指标更好，室壁中膜力学指标是预测预后的独立指标。然而，目前需要复杂的计算来评估它，并且在临床实践中无法常规评估。组织多普勒成像能够跟踪一个点内的LV壁通过一个心动周期，我们测试我们的假设，组织多普勒跟踪技术提供了一个即时的和可靠的评价midwall mechanism.Methods：LV M型超声心动图记录在18例受试者与传统的超声心动图和组织多普勒成像。根据常规超声心动图获得的数据计算中壁缩短，并与组织多普勒跟踪技术测量的数据进行比较。组织多普勒测定的中壁缩短与常规计算值相关良好（r = .84，P < .0001），无论中壁缩短的绝对值如何，它们的差异都很小。结论：中壁力学可以用组织多普勒跟踪技术即时准确地评估。
Background: Left ventricular (LV) systolic function is better characterized by midwall mechanics in patients with LV hypertrophy than by endocardial LV function, and the midwall mechanics is an independent predictor of prognosis. However, a complex calculation is currently required to assess it, and it is not routinely assessable in clinical practice. Tissue Doppler imaging enables tracking of a point within the LV wall though a cardiac cycle; we tested our hypothesis that the tissue Doppler tracking technique provides an instantaneous and reliable evaluation of midwall mechanics.Methods: LV M-mode echocardiogram was recorded in 18 subjects with conventional echocardiography and with tissue Doppler imaging. The midwall shortening was calculated from the data obtained with conventional echocardiography for the comparison with that measured with the tissue Doppler tracking technique. The tissue Doppler-determined midwall shortening correlated well with conventionally calculated value (r = .84, P < .0001), and their difference was small irrespective of absolute value of the midwall shortening.Conclusions: The midwall mechanics can be instantaneously and accurately evaluated with the tissue Doppler tracking technique.