Table 1.
Comparison between semi-automatic and manual analyses of coronary blood flow parameters (mean +/−SD of paired differences, intraclass correlation coefficient (ICC)) in 15 vessels, together with inter-observer reproducibility (semi-automatic method) of the same variables
| MANUAL VERSUS SEMI-AUTOMATIC ANALYSIS | INTER-OBSERVER REPRODUCIBILITY (SEMI-AUTOMATIC ANALYSIS) | |||||
|---|---|---|---|---|---|---|
| mean +/−SD | mean (+/−SD) differences | ICC | mean +/−SD | mean (+/−SD) differences | ICC | |
| mean velocity (mm/s) | 78.7+/−25.8 | −0.9+/−9.8 | 0.93 | 81.0+/−23.9 | −3.7+/−7.3 | 0.95 |
| flow (ml/min) | 54.9+/−23.7 | −10.5+/−11.0* | 0.81 | 61.4+/−26.3 | −2.7+/−5.7 | 0.98 |
| PSV (mm/s) | 72.5+/−35.2 | −1.7+/−17.0 | 0.98 | 74.5+/−33.1 | −1.4+/−16.0 | 0.98 |
| TPSV (ms) | 115.3+/−57.3 | 5.5+/−19.4 | 0.94 | 114.1+/−55.6 | −1.9+/−13.3 | 0.97 |
| PDV (mm/s) | 171.0+/−75.4 | −1.3+/−24.7 | 0.95 | 173.1+/−69.9 | −3.3+/−16.2 | 0.98 |
| TPDV (ms) | 515.2+/−95.1 | −3.0+/−50.2 | 0.90 | 521.4+/−106.7 | −9.4+/−28.5 | 0.96 |
The means of the manual and semi-automatic values (+/−SD) and of the two observers values are included for reference. The ICC is calculated for absolute agreement (single measure). MV mean velocity, PSV peak systolic velocity, TPSV time to peak systolic velocity, PDV peak diastolic velocity and TPDV time to peak diastolic velocity. (* p < .001)