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The relationship between the TTFM variables and the Rentrop collateral grade in normal grafts by one-way ANOVA or the Kruskal–Wallis test. There was no statistically significant correlation between the TTFM variables and the Rentrop collateral grade in the grafts anastomosed to CTOs. TTFM: transit-time flow measurement; CTO: chronic total occlusion; PI: pulsality index; SVG: saphenous vein graft; Qmean: mean flow.
