■我们最近开发了冠状动脉树描述和病变评估（CatLet或Hexu，由He和Xu发明)血管造影评分系统，which,考虑到冠状动脉解剖结构的多样性，冠状动脉的狭窄程度,心肌区域由患病的冠状动脉包围，可用于预测急性心肌梗死患者的临床结果(可在www.catletscore.com).其在临床实践和冠状动脉疾病研究中的价值正在建立。在过去的两年里,这种新型血管造影评分系统的基本原则没有实质性改变,尽管确实发生了轻微的调整.鉴于这些调整和在日常使用中获得的评分经验，我们认为有必要对这些观点进行详细阐述,以便有兴趣的读者能够在临床实践和科学研究中更好地使用这种CatLet或Hexu血管造影评分系统.
■这种新型血管造影评分系统的基本原理包括17心肌节段模型，竞争性血液供应法，和流量守恒定律。
■对这种新颖的血管造影评分系统进行的调整包括：（I）使用基础水平的左心室短轴来表征六种类型的右冠状动脉大小；（II）标记为X和S的部分在左前降支的表征中具有统一的预设差异；（III）在某些情况下添加了标记为“”的部分，以解释罕见的后分支血管中的边缘差异。CatLet或Hexu血管造影评分系统在权重分配中严格遵循流量守恒定律，并进一步强调和详细的病变评分校正。
■在CatLet或Hexu血管造影评分系统上对这些调整和评分经验的阐述将有助于提高其在心血管领域的应用。这种新颖的血管造影评分系统的实用性已得到初步验证，其未来值得期待。
UNASSIGNED: We have recently developed the Coronary Artery Tree description and Lesion EvaluaTion (CatLet or Hexu, invented by He and Xu) angiographic scoring system, which, considering the coronary anatomy in its diversity, the stenosis degree of a coronary artery, and the myocardial territory subtended by the diseased coronary artery, can be utilized to predict clinical outcomes for patients with acute myocardial infarction (available at www.catletscore.com). Its values for clinical practice and coronary artery disease research are building upon. Over the past two years, the principles underlying this novel angiographic scoring system do not materially change although slight adjustments have really happened. Given these adjustments and the scoring experience gained in daily use, we think that it is necessary to elaborate on these points so that readers with interest are capable to better use this CatLet or Hexu angiographic scoring system both in clinical practice and in scientific research.
UNASSIGNED: The principles underlying this novel angiographic scoring system include the 17-myocardial segmental model, law of competitive blood supply, and law of flow conservation.
UNASSIGNED: The adjustments made to this novel angiographic scoring system include: (I) the short axis of the left ventricle at the basal level is used to characterize the six types of right coronary artery size; (II) segments marked with \'X and \'S have a unified preset difference of one segment as adopted in the characterization of left anterior descending artery; (III) segments marked with \'+ have been added to explain the rare variability in the obtuse marginal branches or in the posterolateral vessels in some cases. The CatLet or Hexu angiographic scoring system strictly follows the law of flow conservation in weighting assignment, and the lesion scoring correction has been additionally emphasized and detailed.
UNASSIGNED: The elaboration on these adjustments and scoring experience gained on the CatLet or Hexu angiographic scoring system will help to boost its use in cardiovascular field. The utilities of this novel angiographic scoring system have been preliminarily validated and its future is deserving of being anticipated.
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