Table 1.
Demographics and test utilisation of outpatients presenting with chest pain
| All patients (n=10 622) | Low-risk patients (n=3667)* | Elevated risk patients (n=6995)* | |
| Age (years) | 58.0±13.4 | 47.3±12.7 | 63.6±9.9 |
| Male (%) | 5848 (55.0) | 798 (21.7) | 5050 (72.6) |
| Diamond-Forrester Score (%) | 19.3±15.6 | 5.5±2.4 | 26.7±14.6 |
| % of patients underwent functional test† | 8112 (76.3%) | 2628 (71.6%) | 5484 (78.8%) |
| Stress echocardiogram (dobutamine/exercise) | 3827 (47.2%) | 1741 (66.2%) | 2986 (38.0%) |
| Myocardial perfusion imaging | 4387 (54.1%) | 902 (34.3%) | 3485 (63.5%) |
| Treadmill exercise test | 136 (1.7%) | 73 (2.8%) | 63 (1.1%) |
| Adenosine stress cardiac MR | 10 (0.1%) | 5 (0.2%) | 5 (0.1%) |
| % of patients underwent CT coronary angiogram | 1165 (10.9%) | 437 (11.9%) | 728 (10.4%) |
| % of patients underwent CT coronary calcium scoring | 476 (3.5%) | 172 (4.6%) | 204 (2.9%) |
| Total no of tests per patient is 1 | 8896 (83.7%) | 3315 (90.4%) | 5581 (80.2%) |
| Total no of tests per patient is 2 | 906 (8.5%) | 329 (8.9%) | 577 (8.3%) |
| Total no of tests per patient is 3 | 48 (0.4%) | 19 (0.5%) | 29 (0.4%) |
| % underwent coronary angiogram | 1795 (16.9%) | 155 (4.2%) | 1640 (23.5%) |
| % underwent intervention/bypass surgery | 982 (9.2%) | 42 (1.1%) | 940 (13.5%) |
| Myocardial Infarction | 46 (0.4%) | 4 (0.1%) | 42 (0.6%) |
*Low-risk patients are defined as Diamond-Forrester pretest probability <10%; elevated risk patients are defined as Diamond-Forrester pretest probability >10%.
†Functional tests include treadmill exercise test, treadmill or dobutamine stress echocardiogram, myocardial perfusion imaging and adenosine stress cardiac MRI. Patient may undergo >1 test.