Characteristic | All patients (n = 134) | Diagnostic performance comparison and radiation dose index group (n = 93)c | Radiation dose control group (n = 41)c | p-value |
---|---|---|---|---|
Age (years)a | 65.7 (55.9–70.2) | 62.9 (54.5–70.0) | 67.1 (64.4–70.1) | 0.013 |
Men | 73 (98) | 69 (64) | 83 (34) | 0.090 |
Body mass indexa, b | 26.8 (25.2–30.0) | 27.0 (25.4–30.4) | 26.3 (24.7–29.3) | 0.163 |
Dyslipidaemia | 69 (93) | 69 (64) | 71 (29) | 0.825 |
Arterial hypertension | 80 (107) | 81 (75) | 78 (32) | 0.730 |
Diabetes mellitus | 27 (36) | 24 (22) | 34 (14) | 0.207 |
Clinical presentation | ||||
Typical angina | 24 (32) | 22 (20) | 29 (12) | 0.331 |
Atypical angina | 27 (36) | 25 (23) | 32 (13) | 0.401 |
Nonspecific chest pain | 20 (27) | 22 (20) | 17 (7) | 0.556 |
No chest pain | 29 (39) | 32 (30) | 22 (9) | 0.226 |
Positive stress test | ||||
Electrocardiography | 7 (9) | 6 (6) | 7 (3) | 0.494 |
Echocardiography | 14 (19) | 11 (10) | 22 (9) | 0.087 |
Magnetic resonance perfusion imaging | 17 (23) | 16 (15) | 20 (8) | 0.632 |
Single-photon emission computed tomography | 36 (48) | 39 (36) | 29 (12) | 0.294 |
Pretest CAD status | ||||
Prevalence of CAD | ||||
Suspected or no obstructive disease | 29 (39) | 27 (25) | 34 (14) | 0.394 |
One-vessel disease | 31 (42) | 31 (29) | 32 (13) | 0.952 |
Two-vessel disease | 22 (29) | 24 (22) | 17 (7) | 0.394 |
Three-vessel disease | 16 (22) | 16 (15) | 17 (7) | 0.892 |
Four-vessel disease | 1 (2) | 2 (2) | 0 (0) | 0.999 |
Stress CTP parameters | ||||
Contrast medium dose (ml) a | 60 (60–70) | 60 (60–70) | 60 (60–70) | 0.130 |
Heart rate (bpm) a | 66.4 (61.5–74.5) | 70.7 (64.9–76.4) | 58.0 (53.3–64.1) | 0.001 |
2-segment MSR | 63 (84) | 90 (84) | 0 (0) | < 0.001 |
3-segment MSR | 7 (9) | 10 (9) | 0 (0) | 0.057 |
Per-segment temporal reconstruction window (ms) a | 129.7 (102.8–175.0) | 115.3 (96.8–132.5) | 175 (175–175) | < 0.001 |