Stenosis severity, diameter reduction | ||||||
<50% | 50–74% | ⩾75% | ||||
Mean | SD | Mean | SD | Mean | SD | |
Stenosis | ||||||
Number | 93 | 24 | 27 | |||
Severity (%) | 10 | 16*† | 61 | 8*‡ | 85 | 9†‡ |
rBV (ml.ml−1) | ||||||
Baseline | 0.123 | 0.031 | 0.119 | 0.035 | 0.118 | 0.031 |
Hyperaemia | 0.145 | 0.032¶ | 0.145 | 0.042¶ | 0.144 | 0.034¶ |
β (min−1) | ||||||
Baseline | 9.034 | 3.814 | 11.088 | 5.468 | 10.834 | 4.271 |
Hyperaemia | 21.181 | 7.761¶ | 15.138 | 7.054¶** | 13.466 | 5.703** |
MBF (ml.min−1.g−1) | ||||||
Baseline | 1.020 | 0.414 | 1.186 | 0.307 | 1.156 | 0.372 |
Hyperaemia | 2.859 | 1.090¶ | 1.937 | 0.690¶** | 1.784 | 0.681¶** |
β-reserve (1) | 2.572 | 0.960 | 1.538 | 0.799** | 1.293 | 0.383** |
MBFR (1) | 3.020 | 0.911 | 1.774 | 0.640** | 1.569 | 0.398** |
*p<0.05 vs ⩾75% stenosis severity; †p<0.05 vs 50–74% stenosis severity; ‡p<0.05 vs <50 stenosis severity; ¶p<0.05 vs baseline; **p<0.05 vs <50% stenosis severity (Bonferroni-corrected).
Values are mean (SD).
Statistical test: Kruskal-Wallis tests have been used for comparison between groups and if significant followed by Wilcoxon rank-sum test.
β, blood volume exchange frequency; MBF, myocardial blood flow; MBFR, myocardial blood flow reserve. MCE, myocardial contrast echocardiography; rBV, relative blood volume.