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Figure 4 Frequency of cardiac ischemic events (vertical axis): the overall event rate was not different between the two groups. Only 2.2% of the patients with high collateral flow suffered a major adverse cardiac ischemic event compared with 9.0% of the patients with poor collaterals (p = 0.01). However, the incidence of angina pectoris was significantly higher in patients with abundant compared with patients with scarce collaterals (21% vs. 12%; p = 0.01). CFI = collateral flow index.