Objective: To explore the relationship of Traditional Chinese Medicine (TCM) Syndrome type and coronary arteriography (CAG) with respect to the number and degree of stenosed branches of coronary artery (CA) and ACC/AHA stage of acute coronary syndrome (ACS)

to provide an objective evidence for TCM Syndrome typing on ACS.Methods: Ninety patients of ACS with their TCM Syndrome typing and CAG successfully conducted were enrolled in this study. They were classified into 3 Syndrome types

the blood stasis type (type I)

the phlegm stagnant with blood stasis type (type II)

and the endogenous collateral Wind type (type III) The scores of the number and severity of the stenosis branch of CA and ACC/AHA lesion stage in different Syndrome types were calculated respectively and analysed statistically byRidit analysis.Results: The number of stenosed branches increased gradually with the Syndrome type changing from I → II → III

compared the type III with the other two types(P<C0.01). The severity of stenosis in type I and II were similar

but that of Type III

much aggravated was significantly different from that in the former two (P<0. 01). The ACC/AHA stage of coronary lesion tended to be more complex as the Syndrome type changed

patients of TCM type I and II had mostly lesion of stage A or Bl

while lesion in majority of patients of type III belonged to stage B2 or C

comparison between the three types showed significant difference (P<0.01).Conclusion: Most ACS patients of TCM Syndrome type III with tri-branch

severe stenosed coronary arteries

belong to the complex ACC/AHA stage of B2 and C.