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Figure 3 Individual, collateral flow index values (CFIp, 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 CFIp changes in response to adenosine (i.e. CFIp during hyperemia – CFIp at rest). They were significantly lower in patients with angiographic collateral degree <2 than in those with  2 (horizontal axis). CFIp = pressure derived collateral flow index.
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