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Figure 3 Individual, collateral flow index values (CFI_p, vertical axis, left side panel) at baseline and during adenosine infusion (top panel, horizontal axis). The triangles indicate mean values (± standard deviation). The bottom panel depicts individual, absolute CFI_p changes in response to adenosine (i.e. CFI_p during hyperemia – CFI_p at rest). They were significantly lower in patients with angiographic collateral degree <2 than in those with 2 (horizontal axis). CFI_p = pressure derived collateral flow index.