International Circulation: According an article published in the JACC in February by Galassi et al.， there is a transient impairment of vasomotion function after successful chronic total occlusion recanalization. Could you comment on how this might be avoided by proper selection of stent size?
　　Dr. Kinoshita: It is difficult to avoid. In many cases of diffuse CTO lesion， we often observe the difference of vessel diameter between after procedure and the follow-up. As you know， impairment of vasomotion is a big issue in stent implantation， especially because of the underestimation of stent size. We sometimes confuse which stent size is suitable for that lesion. In such a situation， information from IVUS will be important. Usually， more than 80% of interventional cardiologists in Japan use the IVUS catheter during a procedure. From IVUS images， we can get a lot of informations， such as vessel size and plaque composition. IVUS catheters help us chose the proper stent size. I usually decide stent size in this lesion by a combination of information from IVUS and my own practice.
　　《国际循环》：根据JACC杂志2月由Galassi等发表的一篇论文，CTO成功再通后会有短暂的血管运动功能障碍。能否介绍下如何通过正确地选择支架的尺寸来避免这一问题？
　　Kinoshita教授：短暂的血管功能障碍难以避免。对于很多有弥漫CTO病变的病例，我们经常会发现介入操作之后和随访的血管直径存在差别。正如你刚才所提到的，血管运动功能障碍是支架置入所面临的一个大问题，在对支架大小估计不足的情况下，尤其会发生这一问题。有些时候，我们对哪个支架大小适合病变而感到困惑。此时，IVUS的信息具有重要意义。通常来讲，日本超过80%的介入心脏病医生在操作中会使用IVUS。我们从IVUS影像可得到很多信息，包括血管大小和斑块构成。IVUS有助于我们选择合适的支架大小。我通常综合考虑IVUS的信息和我自己的经验来确定病变合适的支架大小。

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