The heart appeared to be of aortic type with a tortuous and prolonged aorta.

心脏呈主动脉型，主动脉曲屈延长。

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Although definitive treatment of acute type A aortic dissections requires surgery, not more than 80% of patients in IRAD underwent surgery;

尽管明确指出A型主动脉夹层需要急诊手术，但是仅有不到80％的患者进行手术治疗。

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MAIN OUTCOME MEASURES: Type, distribution and proportion of vessel structural abnormity of aortic arch, carotid artery and vertebrobasilar system.

主要观察指标：主动脉弓、颈内动脉及椎基底动脉系统血管结构异常的类型、分布及比例。

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