组织速度显像的彩色M型技术估测犬急性心肌缺血面积的实验研究

Experiment of assessing dog acute ischemic myocardium area by tissue velocity imaging

目的:探讨组织速度显像技术(TVI)对心肌缺血面积的估测作用。方法:11只健康杂种犬行冠状动脉左前降支(LAD)结扎,制作急性心肌缺血模型。在左室心尖二腔心切面,应用TVI的彩色M型曲线技术检测急性缺血心肌分别在前壁和下壁的临界点,以此为界在二维图像上描计出心肌缺血面积与病理缺血面积,并进行比较。结果:心肌缺血面积与病理染色后缺血面积无相关性(r=0.064,P=0.852),测量缺血面积的敏感度和特异度分别20%和17%。结论:TVI的彩色M型技术不适用于对心肌缺血面积进行估测。

Objection： To assess ischemic myocardium area by tissue velocity imaging （TVI）. Methods. Eleven dogs were subjected to LAD coronary artery occlusion for acute ischemia. M-mode of TVI defined the cut-off value of ischemic myocardium, and marked in anterior and inferior in 2D images, respectively. Ischemic area was curved and compared with pathologic result. Results： There was no correlation between pathology and TVI ischemic area （r = 0. 064, P =0. 852）. TVI ischemic area had 20% sensitivity, and 17% specificity, respectively. Conclusion. TVI is not applicable to assess ischemic myocardium area.