Table 3 Heart rate parameters, CCT scan parameters, and image quality in patients receiving low-dose landiolol or propranolol
Low-dose landiolol | Propranolol | P value | |
|---|---|---|---|
(n = 188) | (n = 277) | ||
HR before β-blocker, min-1 | 72.9 ± 7.3 | 72.5 ± 7.7 | 0.64 |
Average HR during the main scan, min-1 | 64.1 ± 7.4 | 61.6 ± 8.0 | <0.001 |
Range of HR during the main scan, min-1 | 5.9 ± 14.3 | 4.4 ± 10.1 | 0.19 |
Decrease of HR, min-1 | 8.8 ± 5.7 | 11.0 ± 7.2 | <0.001 |
Time between β-blocker administration and main scan, min | 4.0 ± 0.6 | 90.5 ± 16.0 | <0.001 |
Helical pitch | <0.001 | ||
Step and shoot | 0 (0.0%) | 5 (1.8%) | |
0.16 | 138 (73.4%) | 141 (50.9%) | |
0.18 | 12 (6.4%) | 26 (9.4%) | |
0.2 | 0 (0.0%) | 3 (1.1%) | |
0.22 | 4 (2.1%) | 22 (7.9%) | |
0.24 | 34 (18.1%) | 80 (28.9%) | |
No. of sectors used | <0.001 | ||
1 | 61 (32.5%) | 141 (50.9%) | |
2 | 119 (63.3%) | 125 (45.1%) | |
3 | 8 (4.4%) | 11 (4.0%) | |
Total exposure, DLP | 1450 ± 335 | 1343 ± 402 | 0.003 |
Main scan duration, sec | 6.8 ± 1.1 | 6.4 ± 1.3 | <0.001 |
Premature beats during the main scan | 16 (8.5%) | 15 (5.4%) | 0.19 |
Failure at breathholding | 3 (1.6%) | 9 (3.2%) | 0.27 |
Presence of coronary artery plaque | 106 (56.3%) | 156 (56.3%) | 0.99 |
Presence of calcification | 139 (73.9%) | 199 (71.8%) | 0.62 |
Maximum image quality score per patient | 0.91 | ||
1 | 55 (29.3%) | 88 (31.8%) | |
2 | 42 (22.3%) | 63 (22.7%) | |
3 | 44 (23.4%) | 64 (23.1%) | |
4 | 29 (15.4%) | 42 (15.2%) | |
5 | 18 (9.6%) | 20 (7.2%) | |
Image quality score per vessel | |||
RCA | 0.86 | ||
1 | 67 (35.6%) | 106 (38.3%) | |
2 | 40 (21.3%) | 66 (23.8%) | |
3 | 38 (20.2%) | 50 (18.1%) | |
4 | 31 (16.5%) | 40 (14.4%) | |
5 | 12 (6.4%) | 15 (5.4%) | |
LAD | 0.70 | ||
1 | 87 (46.3%) | 132 (47.7%) | |
2 | 42 (22.3%) | 72 (26.0%) | |
3 | 38 (20.2%) | 45 (16.2%) | |
4 | 16 (8.5%) | 19 (6.9%) | |
5 | 5 (2.7%) | 9 (3.2%) | |
LCX | 0.32 | ||
1 | 82 (43.6%) | 129 (46.6%) | |
2 | 44 (23.4%) | 69 (24.9%) | |
3 | 31 (16.5%) | 49 (17.7%) | |
4 | 24 (12.8%) | 19 (6.9%) | |
5 | 7 (3.7%) | 11 (4.0%) |