Introduction
Materials and methods
Patients
Invasive coronary angiography and FFR measurement
3D QCA
Quantitative flow ratio calculation
Flow rate by frame counting
Statistical analysis
Results
Patients
Age, years | 64 ± 11 |
BMI, kg/m2
| 27.7 ± 5.3 |
Male | 71% |
Prior PCI | 24% |
Prior myocardial infarction | 6% |
Cardiovascular risk factors | |
Diabetes | 6% |
Hypertension | 65% |
Hypercholesterolemia | 53% |
Smoking | 18% |
Family history of CAD | 12% |
Correlation and agreement between FFR and QFR per observer
Number | Vessel | Wire-based FFR | Diameter stenosisa (%) | Area stenosisa (%) | Lesion lengtha (mm) | QFR Observer 1 | QFR Observer 2 | ||||
---|---|---|---|---|---|---|---|---|---|---|---|
Difference aQFR | Difference cQFR | Difference fQFR | Difference aQFR | Difference cQFR | Difference fQFR | ||||||
1 | LCX prox | 0.96 | 31 | 43 | 16 | 0.00 | 0.00 | 0.00 | −0.02 | −0.01 | −0.01 |
2 | LAD prox | 0.87 | 35 | 48 | 7 | 0.05 | 0.04 | 0.00 | 0.04 | 0.01 | 0.04 |
3 | LAD mid | 0.86 | 29 | 34 | 32 | 0.06 | 0.05 | 0.04 | 0.07 | 0.05 | 0.05 |
4 | LAD mid | 0.84 | 31 | 43 | 13 | Na | 0.06 | 0.08 | Na | −0.02 | −0.03 |
5 | LAD mid | 0.84 | 49 | 64 | 20 | 0.06 | 0.06 | 0.05 | 0.04 | 0.04 | 0.03 |
6 | LCX | 0.89 | 52 | 63 | 12 | 0.00 | −0.03 | 0.00 | 0.02 | −0.02 | 0.01 |
7 | LAD mid | 0.75 | 51 | 64 | 27 | −0.05 | 0.02 | 0.01 | −0.02 | 0.01 | 0.00 |
8 | LAD mid | 0.92 | 30 | 41 | 12 | 0.01 | 0.02 | 0.00 | −0.02 | 0.01 | −0.02 |
9 | LAD mid | 0.80 | 42 | 55 | 13 | 0.01 | −0.05 | −0.01 | 0.04 | 0.00 | 0.02 |
10 | LCX | 0.94 | 38 | 50 | 7 | 0.03 | 0.01 | 0.02 | −0.03 | −0.04 | −0.04 |
11 | LAD | 0.84 | 45 | 58 | 14 | −0.10 | −0.10 | −0.07 | −0.02 | −0.06 | −0.02 |
12 | LAD mid | 0.82 | 33 | 45 | 15 | 0.00 | −0.03 | −0.03 | −0.01 | −0.03 | −0.03 |
13 | LAD mid | 0.85 | 30 | 38 | 4 | 0.05 | 0.03 | 0.03 | 0.01 | −0.03 | −0.01 |
14 | LAD mid | 0.84 | 50 | 62 | 15 | 0.05 | 0.05 | 0.04 | −0.04 | −0.04 | −0.04 |
15 | LAD mid | 0.90 | 34 | 48 | 26 | 0.00 | 0.00 | 0.01 | −0.02 | 0.00 | 0.00 |
Average Standard deviation | 0.86 | 38.7 | 50.4 | 15.4 | 0.01 | 0.01 | 0.01 | 0.00 | −0.01 | 0.00 | |
0.05 | 8.6 | 10.0 | 7.7 | 0.04 | 0.05 | 0.04 | 0.03 | 0.03 | 0.03 | ||
P value | 0.329 | 0.471 | 0.236 | 0.755 | 0.285 | 0.657 |