a clear trendP < 0.001
When analysed alongside the FFR patient cohort, there was a clear trend in stress MBF and MPR values across all ischaemic categories (CTO with inducible defect, FFR ≤ 0.80, FFR 0.81–0.90, FFR > 0.90; P < 0.001 for both stress MBF and MPR) ( Figure 8 ).